{% extends "shared/frontend/base.html" %}

{% block extra_css %}
<style>
    .detail-grid {
        display: grid;
        grid-template-columns: 1fr 1fr 320px;
        gap: 1.5rem;
        align-items: start;
    }

    .section-card {
        background: var(--bg-card);
        border-radius: var(--border-radius);
        padding: 1.5rem;
        box-shadow: 0 2px 15px rgba(0,0,0,0.03);
    }

    .section-title {
        font-size: 1rem;
        font-weight: 600;
        margin-bottom: 1rem;
        color: var(--text-primary);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .sticky-panel {
        position: sticky;
        top: 100px;
    }

    .attachment-dropzone {
        border: 2px dashed rgba(0,0,0,0.1);
        border-radius: 8px;
        padding: 2rem 1rem;
        background-color: var(--bg-body);
        cursor: pointer;
        transition: all 0.2s;
    }

    .attachment-dropzone:hover, .attachment-dropzone.drag-over {
        border-color: var(--accent);
        background-color: var(--accent-light);
    }

    .attachment-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.75rem;
        background: var(--bg-body);
        border-radius: 8px;
        border: 1px solid rgba(0,0,0,0.05);
        margin-bottom: 0.5rem;
    }

    .attachment-actions {
        display: flex;
        gap: 0.5rem;
    }

    .comment-thread {
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }

    .comment-entry {
        background: var(--bg-body);
        padding: 1rem;
        border-radius: 8px;
        border-left: 3px solid var(--accent);
    }

    .comment-header {
        display: flex;
        justify-content: space-between;
        margin-bottom: 0.5rem;
        font-size: 0.9rem;
    }

    .comment-badges {
        display: flex;
        gap: 0.5rem;
        margin-bottom: 0.5rem;
        flex-wrap: wrap;
    }

    .comment-badge {
        font-size: 0.75rem;
        background: white;
        border: 1px solid rgba(0,0,0,0.1);
        padding: 0.25rem 0.5rem;
        border-radius: 4px;
        cursor: pointer;
        text-decoration: none;
        color: var(--text-secondary);
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
    }
    
    .comment-badge:hover {
        background: var(--accent-light);
        color: var(--accent);
        border-color: var(--accent);
    }

    .comment-attachment-stack {
        margin-top: 0.75rem;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .comment-attachment-group {
        border-top: 1px solid rgba(0,0,0,0.05);
        padding-top: 0.5rem;
    }
    
    .comment-attachment-label {
        font-size: 0.7rem;
        text-transform: uppercase;
        color: var(--text-secondary);
        font-weight: 600;
        margin-bottom: 0.25rem;
        display: block;
    }

    .comment-attachment-entry {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 0.5rem;
        flex-wrap: wrap;
        padding: 0.5rem;
        background: white;
        border-radius: 6px;
        margin-bottom: 0.25rem;
    }

    .comment-no-data {
        text-align: center;
        padding: 2rem;
        color: var(--text-secondary);
        background: var(--bg-body);
        border-radius: 8px;
        font-style: italic;
    }

    @media (max-width: 1200px) {
        .detail-grid {
            grid-template-columns: 1fr 1fr;
        }
        .sticky-panel {
            grid-column: span 2;
            position: static;
        }
    }

    @media (max-width: 768px) {
        .detail-grid {
            grid-template-columns: 1fr;
        }
        .sticky-panel {
            grid-column: 1;
        }
        .comment-attachment-entry {
            flex-direction: column;
            align-items: flex-start;
        }
    }
</style>
{% endblock %}

{% block content %}
<div class="d-flex justify-content-between align-items-center mb-4">
    <div>
        <h2 class="fw-bold mb-1" id="pageTitle">Mulighed</h2>
        <p class="text-muted mb-0">Detaljeret pipeline‑visning</p>
    </div>
    <div class="d-flex gap-2">
        <a class="btn btn-outline-secondary" href="/opportunities">
            <i class="bi bi-arrow-left me-2"></i>Tilbage
        </a>
        <button class="btn btn-primary" onclick="saveOpportunity()">
            <i class="bi bi-check-lg me-2"></i>Gem
        </button>
    </div>
</div>

<div class="detail-grid">
    <div class="d-flex flex-column gap-3">
        <!-- Pipeline Status (Moved from right) -->
        <div class="section-card">
            <div class="section-title">Pipeline‑status</div>
            <div class="d-flex justify-content-between mb-2">
                <span class="text-muted">Kunde</span>
                <span id="customerNameBadge">-</span>
            </div>
            <div class="d-flex justify-content-between mb-2">
                <span class="text-muted">Stage</span>
                <span id="stageBadge">-</span>
            </div>
            <div class="d-flex justify-content-between mb-2">
                <span class="text-muted">Værdi</span>
                <span id="amountBadge">-</span>
            </div>
            <div class="d-flex justify-content-between">
                <span class="text-muted">Sandsynlighed</span>
                <span id="probabilityBadge">-</span>
            </div>
        </div>

        <!-- Contact Persons -->
        <div class="section-card">
            <div class="section-title">Kontaktpersoner</div>
            <div id="linkedContactsList" class="d-flex flex-column gap-2 mb-2"></div>
            
            <div class="dropdown mt-2">
                <input type="text" class="form-control" id="contactSearchInput" placeholder="+ Tilføj kontaktperson..." data-bs-toggle="dropdown" autocomplete="off">
                <ul class="dropdown-menu w-100" id="contactSearchResults">
                    <li><span class="dropdown-item text-muted small">Søg for at tilføje...</span></li>
                </ul>
            </div>
        </div>

        <div class="section-card">
            <div class="section-title">Grundoplysninger</div>
            <div class="mb-3">
                <label class="form-label">Titel *</label>
                <input type="text" class="form-control" id="title" required>
            </div>
            <div class="mb-3">
                <label class="form-label">Kunde</label>
                <input type="text" class="form-control" id="customerName" disabled>
            </div>
            <div class="mb-0">
                <label class="form-label">Beskrivelse</label>
                <textarea class="form-control" id="description" rows="4"></textarea>
            </div>
        </div>

        <div class="section-card">
            <div class="section-title">Salgsstatus</div>
            <div class="row g-3">
                <div class="col-md-6">
                    <label class="form-label">Stage</label>
                    <select class="form-select" id="stageId"></select>
                </div>
                <div class="col-md-6">
                    <label class="form-label">Sandsynlighed</label>
                    <input type="text" class="form-control" id="probability" disabled>
                </div>
                <div class="col-md-6">
                    <label class="form-label">Forventet lukning</label>
                    <input type="date" class="form-control" id="expectedCloseDate">
                </div>
            </div>
        </div>
    </div>

    <div class="d-flex flex-column gap-3">
        <div class="section-card">
            <div class="section-title">Løsning & Salgsdetaljer</div>
            <div class="row g-3">
                <div class="col-md-6">
                    <label class="form-label">Beløb</label>
                    <input type="number" step="0.01" class="form-control" id="amount">
                </div>
                <div class="col-md-6">
                    <label class="form-label">Valuta</label>
                    <select class="form-select" id="currency">
                        <option value="DKK">DKK</option>
                        <option value="EUR">EUR</option>
                        <option value="USD">USD</option>
                    </select>
                </div>
            </div>
        </div>

        <div class="section-card">
            <div class="section-title">Tilbud & Kontrakt</div>
            <p class="text-muted small mb-3">Vedhæft relevante dokumenter og se filer fra valgte emails.</p>
            <div id="contractAttachmentDropzone" class="attachment-dropzone d-flex flex-column justify-content-center align-items-center text-center">
                <i class="bi bi-cloud-upload-fill fs-3"></i>
                <span class="small">Træk filer hertil eller klik for at vælge</span>
                <small class="text-muted">Støtter dokumenter, regneark og billeder</small>
            </div>
            <input type="file" id="contractAttachmentInput" multiple class="d-none">
            <div id="contractAttachmentList" class="mt-2 attachment-list"></div>
            <div id="contractEmailAttachmentList" class="mt-2"></div>
        </div>
    </div>

    <div class="sticky-panel d-flex flex-column gap-3">
                <div class="section-card">
                    <div class="section-title">Linket email</div>
                    <input type="search" class="form-control mb-2" id="opportunityEmailSearch" placeholder="Søg email (emne, afsender eller ID)">
                    <div id="opportunityEmailResults" class="list-group list-group-flush mt-2"></div>
                    <!-- Linked Emails Container with Drop Zone -->
                    <div id="emailDropZone" class="border rounded p-2 mt-2" style="border: 2px dashed transparent !important; transition: all 0.2s;">
                        <div id="opportunityLinkedEmailsList" class="d-flex flex-column gap-2"></div>
                        <div class="text-center text-muted small mt-2 fst-italic py-2" style="pointer-events: none;">
                            <i class="bi bi-cloud-upload me-1"></i> Træk emails hertil (.msg, .eml)
                        </div>
                    </div>
                </div>
        <div class="section-card">
            <div class="section-title">Næste aktivitet</div>
            <div class="text-muted small">Aktivitetsmodul kommer senere.</div>
        </div>
    </div>
</div>

<div class="section-card mt-4">
    <div class="d-flex justify-content-between align-items-center mb-3">
        <div>
            <h5 class="mb-0">Varelinjer</h5>
            <p class="text-muted small mb-0">Tilføj eller fjern produkter som indgår i tilbuddet.</p>
        </div>
        <button class="btn btn-outline-primary btn-sm" onclick="openAddLineModal()">
            <i class="bi bi-plus-lg me-1"></i>Tilføj varelinje
        </button>
    </div>
    <div class="mb-3">
        <label class="form-label">Søg efter produkt</label>
        <input type="search" class="form-control" id="lineProductSearch" placeholder="Søg efter varenavn, varenr. eller kategori">
        <div id="productSearchResults" class="list-group list-group-flush mt-2"></div>
    </div>
    <div class="table-responsive">
        <table class="table table-sm table-hover">
            <thead class="table-light">
                <tr>
                    <th>Navn</th>
                    <th>Varenr.</th>
                    <th class="text-end">Antal</th>
                    <th class="text-end">Enhedspris</th>
                    <th class="text-end">Linjetotal</th>
                    <th class="text-end">Handling</th>
                </tr>
            </thead>
            <tbody id="lineItemsTableBody">
                <tr>
                    <td colspan="6" class="text-center text-muted py-4">Ingen varelinjer endnu</td>
                </tr>
            </tbody>
        </table>
    </div>
    <div class="text-end small text-muted" id="lineItemsSummary">Total: 0 kr</div>
</div>

    <div class="section-card mt-4" id="commentsSection">
        <div class="section-title">Kommentarer & aktiviteter</div>
        <div id="commentThread" class="comment-thread"></div>
        <div id="commentEmptyState" class="comment-no-data">Ingen kommentarer endnu</div>
        <div class="mt-4">
            <div class="mb-3">
                <label class="form-label">Kommentar *</label>
                <textarea class="form-control" id="commentContent" rows="3" required></textarea>
            </div>
            <div class="d-flex justify-content-end gap-2">
                <button type="button" class="btn btn-outline-secondary btn-sm" onclick="clearCommentForm()">Nulstil</button>
                <button type="button" class="btn btn-primary btn-sm" onclick="submitComment()">Gem kommentar</button>
            </div>
        </div>
    </div>

<!-- Add Line Modal -->
<div class="modal fade" id="lineModal" tabindex="-1">
    <div class="modal-dialog modal-dialog-centered">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Tilføj varelinje</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <div class="modal-body">
                <form id="lineItemForm">
                    <div class="mb-3">
                        <label class="form-label">Produktnavn *</label>
                        <input type="text" class="form-control" id="lineName" required>
                    </div>
                    <div class="mb-3">
                        <label class="form-label">Varenummer</label>
                        <input type="text" class="form-control" id="lineProductNumber">
                    </div>
                    <div class="row g-3">
                        <div class="col-6">
                            <label class="form-label">Antal *</label>
                            <input type="number" class="form-control" id="lineQuantity" value="1" min="1" required>
                        </div>
                        <div class="col-6">
                            <label class="form-label">Enhedspris *</label>
                            <input type="number" class="form-control" id="lineUnitPrice" step="0.01" value="0.00" required>
                        </div>
                    </div>
                    <div class="mb-3 mt-3">
                        <label class="form-label">Beskrivelse</label>
                        <textarea class="form-control" id="lineDescription" rows="2"></textarea>
                    </div>
                </form>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Annuller</button>
                <button type="button" class="btn btn-primary" onclick="addLineItem()">Gem varelinje</button>
            </div>
        </div>
    </div>
</div>

<!-- Linked Email Modal -->
<div class="modal fade" id="linkedEmailModal" tabindex="-1" aria-labelledby="linkedEmailModalTitle" aria-hidden="true">
    <div class="modal-dialog modal-lg modal-dialog-centered">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="linkedEmailModalTitle">Email</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Luk"></button>
            </div>
            <div class="modal-body" id="linkedEmailModalBody">
                <div class="text-muted">Indlæser...</div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

{% block extra_js %}
<script>
const opportunityId = parseInt(window.location.pathname.split('/').pop());
const API_BASE = ""; // Relative path as frontend is served by same backend
let stages = [];
let opportunity = null;
let lineItems = [];
let lineModal = null;
let selectedProductCandidate = null;
let productSearchTimeout = null;
let comments = [];
let selectedCommentEmail = null;
let contractFiles = [];
let selectedEmailAttachments = [];
let commentEmailSearchTimeout = null;

document.addEventListener('DOMContentLoaded', async () => {
        // Email search for opportunity-level email link
        const opportunityEmailSearchInput = document.getElementById('opportunityEmailSearch');
        let opportunityEmailSearchTimeout = null;
        opportunityEmailSearchInput?.addEventListener('input', (event) => {
            const term = event.target.value.trim();
            clearTimeout(opportunityEmailSearchTimeout);
            if (!term || term.length < 2) {
                renderOpportunityEmailSuggestions([]);
                return;
            }
            opportunityEmailSearchTimeout = setTimeout(() => searchOpportunityEmails(term), 250);
        });

        // Render suggestions for opportunity-level email link
        function renderOpportunityEmailSuggestions(results) {
            const container = document.getElementById('opportunityEmailResults');
            if (!container) return;
            if (!results || results.length === 0) {
                container.innerHTML = '<div class="text-muted small">Ingen emails fundet</div>';
                return;
            }
            container.innerHTML = results.map(email => {
                // Show a preview of the email body (first 200 chars, plain text)
                let preview = '';
                if (email.body_text) {
                    preview = email.body_text.substring(0, 200).replace(/\n/g, ' ');
                } else if (email.body_html) {
                    // Strip HTML tags for preview
                    const tmp = document.createElement('div');
                    tmp.innerHTML = email.body_html;
                    preview = tmp.textContent.substring(0, 200);
                }
                return `
                    <button type="button" class="list-group-item list-group-item-action flex-column align-items-start text-start" data-email-id="${email.id}">
                        <div class="fw-semibold">${escapeHtml(email.subject || 'Ingen emne')}</div>
                        <small class="text-muted">${escapeHtml(email.sender_email || '-')}</small>
                        <small class="text-muted">${formatCommentTimestamp(email.received_date)}</small>
                        <div class="email-preview small mt-1 text-secondary">${escapeHtml(preview)}</div>
                    </button>
                `;
            }).join('');
            container.querySelectorAll('button').forEach(button => {
                button.addEventListener('click', () => {
                    const emailId = button.dataset.emailId;
                    const matched = results.find(item => item.id.toString() === emailId);
                    if (matched) selectOpportunityEmailSuggestion(matched);
                });
            });
        }

        // Search emails for opportunity-level link
        async function searchOpportunityEmails(term) {
            if (!term) {
                renderOpportunityEmailSuggestions([]);
                return;
            }
            try {
                const params = new URLSearchParams({ q: term, limit: '6' });
                const response = await fetch(`${API_BASE}/api/v1/emails?${params}`);
                if (!response.ok) {
                    renderOpportunityEmailSuggestions([]);
                    return;
                }
                const data = await response.json();
                renderOpportunityEmailSuggestions(Array.isArray(data) ? data : data || []);
            } catch (error) {
                console.error('Error searching emails:', error);
                renderOpportunityEmailSuggestions([]);
            }
        }

        // Select email for opportunity-level link
        function selectOpportunityEmailSuggestion(email) {
            // Save the selected email to the opportunity via POST (Many-to-Many)
            fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/email-links`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ email_id: email.id })
            }).then(async resp => {
                if (!resp.ok) {
                    alert('Kunne ikke gemme email-link');
                    return;
                }
                const updatedOpp = await resp.json();
                opportunity = updatedOpp; // Update global state
                if (opportunity.linked_emails) {
                    renderLinkedEmails(opportunity.linked_emails);
                }
                document.getElementById('opportunityEmailResults').innerHTML = '';
            });
        }

        window.renderLinkedEmails = function(emails) {
            const container = document.getElementById('opportunityLinkedEmailsList');
            if(!container) return;
            
            if (!emails || emails.length === 0) {
                 container.innerHTML = '';
                 return;
            }

            container.innerHTML = emails.map(email => {
                 const safeSubject = escapeHtml(email.subject || 'Email');
                 const safeSender = escapeHtml(email.sender_email || '');
                 const dateStr = formatCommentTimestamp(email.received_date);
                 return `
                    <div class="d-flex align-items-center gap-2 p-2 border rounded bg-white">
                        <i class="bi bi-envelope-fill text-primary"></i>
                        <div class="flex-grow-1" style="min-width:0;">
                             <div class="text-truncate fw-medium" style="font-size:0.9rem;">${safeSubject}</div>
                             <div class="text-truncate text-muted small">${safeSender} • ${dateStr}</div>
                        </div>
                        <div class="d-flex gap-1">
                            <button type="button" class="btn btn-sm btn-light text-primary" title="Se email" onclick="showLinkedEmailModal(${email.id})">
                                <i class="bi bi-envelope-open"></i>
                            </button>
                            <button type="button" class="btn btn-sm btn-light text-danger" onclick="removeLinkedEmail(${email.id})" title="Fjern link">
                                <i class="bi bi-x"></i>
                            </button>
                        </div>
                    </div>
                 `;
            }).join('');
        }

        window.removeLinkedEmail = async function(emailId) {
             if(!confirm('Vil du opbryde linket til denne email?')) return;
             try {
                const resp = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/email-links/${emailId}`, {
                    method: 'DELETE'
                });
                if(resp.ok) {
                     if(opportunity.linked_emails) {
                         opportunity.linked_emails = opportunity.linked_emails.filter(e => e.id !== emailId);
                         renderLinkedEmails(opportunity.linked_emails);
                     }
                } else {
                    alert('Kunne ikke fjerne link');
                }
             } catch(e) {
                 console.error(e);
                 alert('Fejl ved fjernelse af link');
             }
        };

        window.showLinkedEmailModal = function(emailId) {
            const modal = document.getElementById('linkedEmailModal');
            const modalTitle = document.getElementById('linkedEmailModalTitle');
            const modalBody = document.getElementById('linkedEmailModalBody');
            if (!modal || !modalTitle || !modalBody) return;
            modalTitle.textContent = 'Indlæser...';
            modalBody.innerHTML = '<div class="text-muted">Henter email...</div>';
            
            fetch(`${API_BASE}/api/v1/emails/${emailId}`)
                .then(resp => resp.ok ? resp.json() : Promise.reject('Ikke fundet'))
                .then(email => {
                    modalTitle.textContent = email.subject || 'Email';
                    let html = `<div class='mb-2'><strong>Fra:</strong> ${escapeHtml(email.sender_email || '')}</div>`;
                    html += `<div class='mb-2'><strong>Til:</strong> ${escapeHtml(email.recipient_email || '')}</div>`;
                    html += `<div class='mb-2'><strong>Modtaget:</strong> ${formatCommentTimestamp(email.received_date)}</div>`;
                    html += `<hr>`;
                    if (email.body_html) {
                        html += `<div style='background:#f8f9fa;padding:1rem;border-radius:8px;max-height:400px;overflow:auto'><div>${email.body_html}</div></div>`;
                    } else {
                        html += `<pre style='background:#f8f9fa;padding:1rem;border-radius:8px;max-height:400px;overflow:auto'>${escapeHtml(email.body_text || '')}</pre>`;
                    }
                    if (email.attachments && email.attachments.length) {
                        html += `<div class='mt-3'><strong>Vedhæftede filer:</strong><ul>`;
                        for (const att of email.attachments) {
                            const url = `/api/v1/emails/${email.id}/attachments/${att.id}`;
                            html += `<li><a href='${url}' target='_blank' rel='noreferrer'>${escapeHtml(att.filename)}</a></li>`;
                        }
                        html += `</ul></div>`;
                    }
                    modalBody.innerHTML = html;
                })
                .catch(() => {
                    modalTitle.textContent = 'Email ikke fundet';
                    modalBody.innerHTML = '<div class="text-danger">Kunne ikke hente email-detaljer.</div>';
                });
            const bsModal = new bootstrap.Modal(modal);
            bsModal.show();
        };

        // --- Drag & Drop for Emails ---
        const dropZone = document.getElementById('emailDropZone');
        if (dropZone) {
            ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
                dropZone.addEventListener(eventName, preventDefaults, false);
            });

            function preventDefaults(e) {
                e.preventDefault();
                e.stopPropagation();
            }

            dropZone.addEventListener('dragover', () => {
                dropZone.style.borderColor = 'var(--accent)';
                dropZone.style.backgroundColor = 'var(--accent-light)';
            });

            dropZone.addEventListener('dragleave', () => {
                dropZone.style.borderColor = 'transparent';
                dropZone.style.backgroundColor = 'transparent';
            });

            dropZone.addEventListener('drop', handleDrop);

            async function handleDrop(e) {
                dropZone.style.borderColor = 'transparent';
                dropZone.style.backgroundColor = 'transparent';
                
                const dt = e.dataTransfer;
                const files = dt.files;

                if (!files || files.length === 0) return;

                const validExtensions = ['.msg', '.eml'];
                let uploadCount = 0;

                for (let i = 0; i < files.length; i++) {
                    const file = files[i];
                    const ext = '.' + file.name.split('.').pop().toLowerCase();
                    
                    if (validExtensions.includes(ext)) {
                        await uploadEmailFile(file);
                        uploadCount++;
                    }
                }
                
                if (uploadCount === 0 && files.length > 0) {
                    alert('Kun .msg og .eml filer er understøttet her.');
                }
            }
        }

        async function uploadEmailFile(file) {
             const formData = new FormData();
             formData.append('file', file);
             
             try {
                 const badgeLabel = document.querySelector('#emailDropZone .text-muted');
                 const originalText = badgeLabel ? badgeLabel.innerHTML : '';
                 if(badgeLabel) badgeLabel.innerHTML = '<span class="spinner-border spinner-border-sm"></span> Uploader...';
                 
                 const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/upload-email`, {
                     method: 'POST',
                     body: formData
                 });
                 
                 if (!response.ok) {
                    try {
                        const errJson = await response.json();
                        alert(`Fejl ved upload af ${file.name}: ${errJson.detail || 'Ukendt fejl'}`);
                    } catch(e) {
                        alert(`Fejl ved upload af ${file.name}`);
                    }
                 } else {
                     const updatedOpp = await response.json();
                     opportunity = updatedOpp;
                     if (opportunity.linked_emails) {
                         renderLinkedEmails(opportunity.linked_emails);
                     }
                 }
                 
                 if(badgeLabel) badgeLabel.innerHTML = originalText;
                 
             } catch (error) {
                 console.error('Error uploading email:', error);
                 alert('Netværksfejl ved upload');
             }
        }

        // --- Contact Persons Logic ---
        let contactSearchTimeout = null;
        const contactInput = document.getElementById('contactSearchInput');
        
        contactInput?.addEventListener('input', (e) => {
            const term = e.target.value.trim();
            clearTimeout(contactSearchTimeout);
            if (term.length < 2) {
                renderContactSuggestions([]);
                return;
            }
            contactSearchTimeout = setTimeout(() => searchContacts(term), 300);
        });

        async function searchContacts(term) {
             try {
                 const resp = await fetch(`${API_BASE}/api/v1/contacts?search=${encodeURIComponent(term)}&limit=5`);
                 if(resp.ok) {
                     const data = await resp.json();
                     renderContactSuggestions(data.contacts || []);
                 }
             } catch(e) {
                 console.error(e);
             }
        }

        function renderContactSuggestions(contacts) {
            const container = document.getElementById('contactSearchResults');
            if(!container) return;
            
            if(contacts.length === 0) {
                container.innerHTML = '<li><span class="dropdown-item text-muted small">Ingen fundet</span></li>';
                return;
            }

            container.innerHTML = contacts.map(c => {
                 // Check if already linked
                 const isLinked = opportunity.linked_contacts && opportunity.linked_contacts.some(lc => lc.id === c.id);
                 if (isLinked) return '';

                 const company = c.company_name || (c.company_names && c.company_names[0]) || '-';
                 return `<li><a class="dropdown-item" href="#" onclick="dataSelectContact(${c.id})">
                    <div class="fw-bold">${escapeHtml(c.first_name)} ${escapeHtml(c.last_name)}</div>
                    <div class="small text-muted">${escapeHtml(company)} • ${escapeHtml(c.email || '')}</div>
                 </a></li>`;
            }).join('') || '<li><span class="dropdown-item text-muted small">Alle fundne er allerede tilføjet</span></li>';
        }
        
        // Expose to global scope for onclick in string literal
        window.dataSelectContact = async function(contactId) {
             const role = prompt("Rolle (f.eks. Beslutningstager, Influencer)?", "");
             
             try {
                 const resp = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/contacts`, {
                     method: 'POST',
                     headers: {'Content-Type': 'application/json'},
                     body: JSON.stringify({contact_id: contactId, role: role})
                 });
                 if(resp.ok) {
                     opportunity = await resp.json();
                     if(opportunity.linked_contacts) renderLinkedContacts(opportunity.linked_contacts);
                     document.getElementById('contactSearchInput').value = '';
                 } else {
                     alert('Fejl ved tilføjelse');
                 }
             } catch(e) {
                 console.error(e);
                 alert('Fejl ved tilføjelse');
             }
        };

        window.renderLinkedContacts = function(contacts) {
             const container = document.getElementById('linkedContactsList');
             if(!container) return;
             
             if(!contacts || contacts.length === 0) {
                 container.innerHTML = '<div class="text-muted small fst-italic">Ingen kontaktpersoner</div>';
                 return;
             }
             
             container.innerHTML = contacts.map(c => `
                <div class="d-flex align-items-center justify-content-between p-2 border rounded bg-white">
                    <div>
                        <div class="fw-medium">${escapeHtml(c.first_name)} ${escapeHtml(c.last_name)}</div>
                        <div class="text-muted small">${escapeHtml(c.role || 'Ingen rolle')}</div>
                        ${c.email ? `<div class="text-muted small"><a href="mailto:${c.email}" class="text-decoration-none text-muted"><i class="bi bi-envelope"></i> ${escapeHtml(c.email)}</a></div>` : ''}
                        ${c.mobile_phone ? `<div class="text-muted small"><a href="tel:${c.mobile_phone}" class="text-decoration-none text-muted"><i class="bi bi-phone"></i> ${escapeHtml(c.mobile_phone)}</a></div>` : ''}
                    </div>
                    <button class="btn btn-sm btn-light text-danger" onclick="removeContactLink(${c.id})" title="Fjern">
                        <i class="bi bi-x"></i>
                    </button>
                </div>
             `).join('');
        }

        window.removeContactLink = async function(contactId) {
            if(!confirm('Fjern kontaktperson?')) return;
            try {
                const resp = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/contacts/${contactId}`, {
                    method: 'DELETE'
                });
                if(resp.ok) {
                    opportunity = await resp.json();
                    if(opportunity.linked_contacts) renderLinkedContacts(opportunity.linked_contacts);
                }
            } catch(e) { console.error(e); }
        };

    lineModal = new bootstrap.Modal(document.getElementById('lineModal'));
    const searchInput = document.getElementById('lineProductSearch');
    searchInput?.addEventListener('input', (event) => {
        const term = event.target.value.trim();
        clearTimeout(productSearchTimeout);
        if (!term || term.length < 2) {
            renderProductSuggestions([]);
            return;
        }
        productSearchTimeout = setTimeout(() => searchProducts(term), 250);
    });

    const emailSearchInput = document.getElementById('commentEmailSearch');
    emailSearchInput?.addEventListener('input', (event) => {
        const term = event.target.value.trim();
        clearTimeout(commentEmailSearchTimeout);
        if (!term || term.length < 2) {
            renderEmailSuggestions([]);
            return;
        }
        commentEmailSearchTimeout = setTimeout(() => searchEmails(term), 250);
    });

    const attachmentInput = document.getElementById('contractAttachmentInput');
    const dropzone = document.getElementById('contractAttachmentDropzone');
    dropzone?.addEventListener('click', () => attachmentInput?.click());
    dropzone?.addEventListener('dragover', (event) => {
        event.preventDefault();
        dropzone.classList.add('drag-over');
    });
    dropzone?.addEventListener('dragleave', () => dropzone.classList.remove('drag-over'));
    dropzone?.addEventListener('drop', (event) => {
        event.preventDefault();
        dropzone.classList.remove('drag-over');
        uploadContractFiles(event.dataTransfer.files);
    });
    attachmentInput?.addEventListener('change', (event) => {
        uploadContractFiles(event.target.files);
        event.target.value = '';
    });

    renderEmailAttachmentPreview();

    await loadStages();
    await loadOpportunity();
    await loadContractFiles();
});

async function loadStages() {
    const response = await fetch(`${API_BASE}/api/v1/pipeline/stages`);
    stages = await response.json();

    const select = document.getElementById('stageId');
    select.innerHTML = stages.map(s => `<option value="${s.id}">${s.name}</option>`).join('');
}

async function loadOpportunity() {
    const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}`);
    if (!response.ok) {
        alert('Mulighed ikke fundet');
        window.location.href = '/opportunities';
        return;
    }

    opportunity = await response.json();
    renderOpportunity();
    await loadLineItems();
    await loadComments();
}

function renderOpportunity() {
    document.getElementById('pageTitle').textContent = opportunity.title;
    document.getElementById('title').value = opportunity.title;
    document.getElementById('customerName').value = opportunity.customer_name || '-';
    document.getElementById('description').value = opportunity.description || '';
    document.getElementById('amount').value = opportunity.amount || 0;
    document.getElementById('currency').value = opportunity.currency || 'DKK';
    document.getElementById('expectedCloseDate').value = opportunity.expected_close_date || '';
    document.getElementById('stageId').value = opportunity.stage_id;
    document.getElementById('probability').value = `${opportunity.probability || 0}%`;

    document.getElementById('customerNameBadge').textContent = opportunity.customer_name || '-';
    document.getElementById('stageBadge').textContent = opportunity.stage_name || '-';
    document.getElementById('amountBadge').textContent = formatCurrency(opportunity.amount, opportunity.currency);
    document.getElementById('probabilityBadge').textContent = `${opportunity.probability || 0}%`;

    if (opportunity.linked_emails && window.renderLinkedEmails) {
        window.renderLinkedEmails(opportunity.linked_emails);
    }
    if (opportunity.linked_contacts && window.renderLinkedContacts) {
         window.renderLinkedContacts(opportunity.linked_contacts);
    }
}

async function saveOpportunity() {
    const payload = {
        title: document.getElementById('title').value,
        description: document.getElementById('description').value || null,
        amount: parseFloat(document.getElementById('amount').value || 0),
        currency: document.getElementById('currency').value,
        expected_close_date: document.getElementById('expectedCloseDate').value || null,
        stage_id: parseInt(document.getElementById('stageId').value)
    };

    const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(payload)
    });

    if (!response.ok) {
        alert('Kunne ikke gemme mulighed');
        return;
    }

    opportunity = await response.json();
    renderOpportunity();
    await loadLineItems();
}

async function loadLineItems() {
    try {
        const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/lines`);
        if (response.ok) {
            lineItems = await response.json();
        } else {
            lineItems = [];
        }
    } catch (error) {
        console.error('Error loading line items:', error);
        lineItems = [];
    }

    renderLineItems();
}

function renderLineItems() {
    const tbody = document.getElementById('lineItemsTableBody');
    const summary = document.getElementById('lineItemsSummary');
    if (!tbody) return;

    if (!lineItems || lineItems.length === 0) {
        tbody.innerHTML = '<tr><td colspan="6" class="text-center text-muted py-4">Ingen varelinjer endnu</td></tr>';
        if (summary) summary.textContent = 'Total: 0 kr';
        return;
    }

    let total = 0;
    tbody.innerHTML = lineItems.map(line => {
        total += parseFloat(line.total_price || 0);
        return `
            <tr>
                <td>${escapeHtml(line.name)}</td>
                <td>${escapeHtml(line.product_number || '-')}</td>
                <td class="text-end">${line.quantity}</td>
                <td class="text-end">${formatCurrency(line.unit_price, opportunity?.currency || 'DKK')}</td>
                <td class="text-end">${formatCurrency(line.total_price || 0, opportunity?.currency || 'DKK')}</td>
                <td class="text-end">
                    <button class="btn btn-sm btn-outline-danger" onclick="deleteLineItem(${line.id})">
                        <i class="bi bi-trash"></i>
                    </button>
                </td>
            </tr>
        `;
    }).join('');

    if (summary) {
        summary.textContent = `Total: ${formatCurrency(total, opportunity?.currency || 'DKK')}`;
    }
}

async function searchProducts(term) {
    if (!term) return;
    try {
        const params = new URLSearchParams({ search: term, limit: '8' });
        const response = await fetch(`/api/v1/webshop/products/search?${params}`);
        if (!response.ok) {
            renderProductSuggestions([]);
            return;
        }

        const data = await response.json();
        renderProductSuggestions(data.products || []);
    } catch (error) {
        console.error('Error searching products:', error);
    }
}

function renderProductSuggestions(products) {
    const container = document.getElementById('productSearchResults');
    if (!container) return;

    if (!products || products.length === 0) {
        container.innerHTML = '<div class="text-muted small">Ingen produkter fundet</div>';
        return;
    }

    container.innerHTML = products.map(product => `
        <button type="button" class="list-group-item list-group-item-action d-flex justify-content-between align-items-start" data-product-id="${product.id}">
            <div>
                <strong>${escapeHtml(product.name)}</strong>
                <div class="small text-muted">${escapeHtml(product.product_number || '')} ${escapeHtml(product.category || '')}</div>
            </div>
            <span class="text-primary">${formatCurrency(product.base_price, opportunity?.currency || 'DKK')}</span>
        </button>
    `).join('');

    container.querySelectorAll('button').forEach(button => {
        button.addEventListener('click', () => {
            const productId = button.dataset.productId;
            const product = products.find(p => p.id.toString() === productId);
            if (product) selectProductSuggestion(product);
        });
    });
}

function selectProductSuggestion(product) {
    selectedProductCandidate = product;
    document.getElementById('lineProductSearch').value = `${product.name} (${product.product_number || 'N/A'})`;
    document.getElementById('lineName').value = product.name;
    document.getElementById('lineProductNumber').value = product.product_number || '';
    document.getElementById('lineUnitPrice').value = parseFloat(product.base_price || 0).toFixed(2);
    renderProductSuggestions([]);
}

function openAddLineModal() {
    clearLineModal();
    lineModal?.show();
}

function clearLineModal() {
    selectedProductCandidate = null;
    document.getElementById('lineItemForm')?.reset();
    document.getElementById('lineQuantity').value = '1';
    document.getElementById('lineUnitPrice').value = '0.00';
    document.getElementById('lineProductSearch').value = '';
    renderProductSuggestions([]);
}

async function addLineItem() {
    const form = document.getElementById('lineItemForm');
    if (!form.checkValidity()) {
        form.reportValidity();
        return;
    }

    const payload = {
        name: document.getElementById('lineName').value.trim(),
        product_number: document.getElementById('lineProductNumber').value.trim() || selectedProductCandidate?.product_number,
        description: document.getElementById('lineDescription').value.trim() || null,
        quantity: parseInt(document.getElementById('lineQuantity').value || '1', 10),
        unit_price: parseFloat(document.getElementById('lineUnitPrice').value || '0')
    };

    try {
        const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/lines`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload)
        });

        if (!response.ok) {
            const error = await response.text();
            alert(error || 'Kunne ikke tilføje varelinje');
            return;
        }

        lineModal?.hide();
        await loadLineItems();
    } catch (error) {
        console.error('Error adding line item:', error);
        alert('Fejl ved tilføjelse af varelinje');
    }
}

async function deleteLineItem(lineId) {
    if (!confirm('Vil du fjerne denne varelinje?')) return;

    try {
        const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/lines/${lineId}`, {
            method: 'DELETE'
        });

        if (response.ok) {
            await loadLineItems();
        }
    } catch (error) {
        console.error('Error deleting line item:', error);
    }
}

async function loadComments() {
    try {
        const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/comments`);
        comments = response.ok ? await response.json() : [];
    } catch (error) {
        console.error('Error loading comments:', error);
        comments = [];
    }

    renderComments();
}

function renderComments() {
    const thread = document.getElementById('commentThread');
    const emptyState = document.getElementById('commentEmptyState');
    if (!thread || !emptyState) return;

    if (!comments.length) {
        thread.innerHTML = '';
        emptyState.style.display = 'block';
        return;
    }

    emptyState.style.display = 'none';
    thread.innerHTML = comments.map(comment => {
        const authorLabel = comment.author_name || comment.user_full_name || comment.username || 'Hub Bruger';
        let emailBadge = '';
        if (comment.email_id) {
            const subject = comment.email_subject ? comment.email_subject : `Email #${comment.email_id}`;
            const sender = comment.email_sender || '';
            const date = comment.email_received_date ? formatCommentTimestamp(comment.email_received_date) : '';
            const safeLink = escapeHtml(`/emails/${comment.email_id}`);
            emailBadge = `
                <a class="comment-badge d-inline-flex flex-column align-items-start" href="${safeLink}" target="_blank" rel="noreferrer"
                   title="Se email detaljer" >
                    <div><i class="bi bi-envelope me-1"></i><span class="fw-semibold">${escapeHtml(subject)}</span></div>
                    <div class="small text-muted">${escapeHtml(sender)}</div>
                    <div class="small text-muted">${escapeHtml(date)}</div>
                </a>
            `;
        }

        let contractBadge = '';
        if (comment.contract_number) {
            const label = `Kontrakt: ${comment.contract_number}`;
            const title = comment.contract_context ? escapeHtml(comment.contract_context) : '';
            if (comment.contract_link) {
                const safeLink = escapeHtml(comment.contract_link);
                contractBadge = `
                    <a class="comment-badge" href="${safeLink}" target="_blank" rel="noreferrer" title="${title}">
                        <i class="bi bi-file-earmark-text"></i>${escapeHtml(label)}
                    </a>
                `;
            } else {
                contractBadge = `<span class="comment-badge" title="${title}"><i class="bi bi-file-earmark-text"></i>${escapeHtml(label)}</span>`;
            }
        }

        return `
            <div class="comment-entry">
                <div class="comment-header">
                    <div>
                        <strong>${escapeHtml(authorLabel)}</strong>
                        <div class="comment-meta">${formatCommentTimestamp(comment.created_at)}</div>
                    </div>
                    <div class="comment-badges">
                        ${emailBadge}
                        ${contractBadge}
                    </div>
                </div>
                <div class="comment-body">${formatCommentBody(comment.content)}</div>
                ${renderCommentAttachments(comment)}
            </div>
        `;
    }).join('');
}

function formatCommentTimestamp(value) {
    if (!value) return '';
    const parsed = new Date(value);
    if (Number.isNaN(parsed.getTime())) return '';
    return parsed.toLocaleString('da-DK', { dateStyle: 'medium', timeStyle: 'short' });
}

function formatCommentBody(text) {
    if (!text) return '';
    return escapeHtml(text).replace(/\n/g, '<br>');
}

async function submitComment() {
    const contentEl = document.getElementById('commentContent');
    if (!contentEl) return;
    const content = contentEl.value.trim();
    if (!content) {
        alert('Kommentar er påkrævet');
        return;
    }

    const formData = new FormData();
    formData.append('content', content);
    formData.append('author_name', getCurrentUserDisplayName());

    if (selectedCommentEmail) {
        formData.append('email_id', selectedCommentEmail.id);
        formData.append('metadata', JSON.stringify({ linked_email_subject: selectedCommentEmail.subject }));
    }

    try {
        const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/comments`, {
            method: 'POST',
            body: formData
        });

        if (!response.ok) {
            const error = await response.text();
            alert(error || 'Kunne ikke gemme kommentar');
            return;
        }

        clearCommentForm();
        await loadComments();
    } catch (error) {
        console.error('Error saving comment:', error);
        alert('Fejl ved gemning af kommentar');
    }
}

function renderCommentAttachments(comment) {
    const saved = comment.attachments || [];
    const emailFiles = comment.email_attachments || [];
    if (!saved.length && !emailFiles.length) {
        return '';
    }

    const sections = [];

    if (saved.length) {
        sections.push(`
            <div class="comment-attachment-group">
                <span class="comment-attachment-label">Vedhæftede filer</span>
                ${saved.map(file => {
                    const safeUrl = escapeHtml(file.download_url);
                    return `
                    <div class="comment-attachment-entry">
                        <div>
                            <strong>${escapeHtml(file.filename)}</strong>
                            <div class="small text-muted">${formatFileSize(file.size_bytes)}</div>
                        </div>
                        <div class="attachment-actions">
                            <a class="btn btn-sm btn-outline-primary" href="${safeUrl}" target="_blank" rel="noreferrer">Se</a>
                            <a class="btn btn-sm btn-outline-secondary" href="${safeUrl}" download target="_blank" rel="noreferrer">Download</a>
                        </div>
                    </div>
                    `;
                }).join('')}
            </div>
        `);
    }

    if (emailFiles.length) {
        sections.push(`
            <div class="comment-attachment-group">
                <span class="comment-attachment-label">Emailvedhæftede filer</span>
                ${emailFiles.map(file => {
                    const safeUrl = escapeHtml(file.download_url);
                    return `
                    <div class="comment-attachment-entry">
                        <div>
                            <strong>${escapeHtml(file.filename)}</strong>
                            <div class="small text-muted">${formatFileSize(file.size_bytes)}</div>
                        </div>
                        <div class="attachment-actions">
                            <a class="btn btn-sm btn-outline-primary" href="${safeUrl}" target="_blank" rel="noreferrer">Se</a>
                            <a class="btn btn-sm btn-outline-secondary" href="${safeUrl}" download target="_blank" rel="noreferrer">Download</a>
                        </div>
                    </div>
                    `;
                }).join('')}
            </div>
        `);
    }

    return `<div class="comment-attachment-stack">${sections.join('')}</div>`;
}

function clearCommentForm() {
    const contentEl = document.getElementById('commentContent');
    if (contentEl) contentEl.value = '';
    const emailInput = document.getElementById('commentEmailSearch');
    if (emailInput) emailInput.value = '';
    const attachmentInput = document.getElementById('contractAttachmentInput');
    if (attachmentInput) attachmentInput.value = '';
    selectedEmailAttachments = [];
    renderEmailAttachmentPreview();
    renderEmailSuggestions([]);
    clearLinkedEmail();
}

function clearLinkedEmail() {
    selectedCommentEmail = null;
    const badge = document.getElementById('linkedEmailBadge');
    const label = document.getElementById('linkedEmailLabel');
    if (badge) badge.style.display = 'none';
    if (label) label.textContent = '';
    selectedEmailAttachments = [];
    renderEmailAttachmentPreview();
}

async function searchEmails(term) {
    if (!term) {
        renderEmailSuggestions([]);
        return;
    }

    try {
        const params = new URLSearchParams({ q: term, limit: '6' });
        const response = await fetch(`/api/v1/emails?${params}`);
        if (!response.ok) {
            renderEmailSuggestions([]);
            return;
        }

        const data = await response.json();
        renderEmailSuggestions(Array.isArray(data) ? data : data || []);
    } catch (error) {
        console.error('Error searching emails:', error);
        renderEmailSuggestions([]);
    }
}

function renderEmailSuggestions(results) {
    const container = document.getElementById('commentEmailResults');
    if (!container) return;

    if (!results || results.length === 0) {
        container.innerHTML = '<div class="text-muted small">Ingen emails fundet</div>';
        return;
    }

    container.innerHTML = results.map(email => `
        <button type="button" class="list-group-item list-group-item-action d-flex flex-column align-items-start" data-email-id="${email.id}">
            <div class="fw-semibold">${escapeHtml(email.subject || 'Ingen emne')}</div>
            <small class="text-muted">${escapeHtml(email.sender_email || '-')}</small>
            <small class="text-muted">${formatCommentTimestamp(email.received_date)}</small>
        </button>
    `).join('');

    container.querySelectorAll('button').forEach(button => {
        button.addEventListener('click', () => {
            const emailId = button.dataset.emailId;
            const matched = results.find(item => item.id.toString() === emailId);
            if (matched) selectEmailSuggestion(matched);
        });
    });
}

function selectEmailSuggestion(email) {
    selectedCommentEmail = email;
    const emailInput = document.getElementById('commentEmailSearch');
    if (emailInput) emailInput.value = email.subject || '';
    const badge = document.getElementById('linkedEmailBadge');
    const label = document.getElementById('linkedEmailLabel');
    if (badge) badge.style.display = 'flex';
    if (label) label.textContent = `${email.subject || 'Email'} • ${email.sender_email || ''}`;
    document.getElementById('commentEmailResults').innerHTML = '';
    fetchEmailAttachments(email.id);
}

async function fetchEmailAttachments(emailId) {
    if (!emailId) {
        selectedEmailAttachments = [];
        renderEmailAttachmentPreview();
        return;
    }

    try {
        const response = await fetch(`/api/v1/emails/${emailId}`);
        if (!response.ok) {
            selectedEmailAttachments = [];
        } else {
            const data = await response.json();
            const attachments = Array.isArray(data.attachments) ? data.attachments : [];
            selectedEmailAttachments = attachments.map(att => ({
                ...att,
                download_url: `/api/v1/emails/${emailId}/attachments/${att.id}`
            }));
        }
    } catch (error) {
        console.error('Error fetching email attachments:', error);
        selectedEmailAttachments = [];
    }

    renderEmailAttachmentPreview();
}

function renderEmailAttachmentPreview() {
    const container = document.getElementById('contractEmailAttachmentList');
    if (!container) return;

    if (!selectedEmailAttachments.length) {
        container.innerHTML = '<div class="text-muted small">Ingen filer fra den valgte email</div>';
        return;
    }

    container.innerHTML = selectedEmailAttachments.map(att => {
        const safeUrl = escapeHtml(att.download_url);
        return `
        <div class="attachment-item">
            <div>
                <strong>${escapeHtml(att.filename)}</strong>
                <div class="small text-muted">${formatFileSize(att.size_bytes)}</div>
            </div>
            <div class="attachment-actions">
                <a class="btn btn-sm btn-outline-primary" href="${safeUrl}" target="_blank" rel="noreferrer">Se</a>
                <a class="btn btn-sm btn-outline-secondary" href="${safeUrl}" download target="_blank" rel="noreferrer">Download</a>
            </div>
        </div>
    `;
    }).join('');
}

async function loadContractFiles() {
    try {
        const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/contract-files`);
        contractFiles = response.ok ? await response.json() : [];
    } catch (error) {
        console.error('Error fetching contract files:', error);
        contractFiles = [];
    }
    renderContractFiles();
}

function renderContractFiles() {
    const container = document.getElementById('contractAttachmentList');
    if (!container) return;

    if (!contractFiles.length) {
        container.innerHTML = '<div class="text-muted small">Ingen vedhæftede filer</div>';
        return;
    }

    container.innerHTML = contractFiles.map(file => {
        const safeUrl = escapeHtml(file.download_url);
        return `
        <div class="attachment-item">
            <div>
                <strong>${escapeHtml(file.filename)}</strong>
                <div class="small text-muted">${formatFileSize(file.size_bytes)}</div>
            </div>
            <div class="attachment-actions">
                <a class="btn btn-sm btn-outline-primary" href="${safeUrl}" target="_blank" rel="noreferrer">Se</a>
                <a class="btn btn-sm btn-outline-secondary" href="${safeUrl}" download target="_blank" rel="noreferrer">Download</a>
            </div>
        </div>
    `;
    }).join('');
}

async function uploadContractFiles(fileList) {
    if (!fileList || !fileList.length) return;

    const formData = new FormData();
    Array.from(fileList).forEach(file => formData.append('files', file));

    try {
        const response = await fetch(`${API_BASE}/api/v1/opportunities/${opportunityId}/contract-files`, {
            method: 'POST',
            body: formData
        });

        if (!response.ok) {
            const error = await response.text();
            alert(error || 'Kunne ikke uploade filer');
            return;
        }

        await loadContractFiles();
    } catch (error) {
        console.error('Error uploading contract files:', error);
        alert('Fejl ved upload af filer');
    }
}

function getCurrentUserDisplayName() {
    const profile = document.querySelector('.dropdown .small.fw-bold');
    return profile ? profile.textContent.trim() : 'Hub Bruger';
}

function formatFileSize(bytes) {
    const units = ['B', 'KB', 'MB', 'GB'];
    let value = Number(bytes) || 0;
    let index = 0;
    while (value >= 1024 && index < units.length - 1) {
        value /= 1024;
        index += 1;
    }
    const decimals = index === 0 ? 0 : 1;
    return `${value.toFixed(decimals)} ${units[index]}`;
}

function formatCurrency(value, currency) {
    const num = parseFloat(value || 0);
    return new Intl.NumberFormat('da-DK', { style: 'currency', currency: currency || 'DKK' }).format(num);
}

function escapeHtml(text) {
    if (!text) return '';
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}
</script>
{% endblock %}