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

{% block title %}Faktura-fejl-finder - Fejlliste - BMC Hub{% endblock %}

{% block content %}
<div class="container-fluid py-4">
    <div class="d-flex justify-content-between align-items-start flex-wrap gap-3 mb-4">
        <div>
            <h1 class="h3 mb-1">📋 Faktura-fejl-liste</h1>
            <p class="text-muted mb-0">Gennemgå, godkend og håndter registrerede fakturaafvigelser.</p>
        </div>
        <div class="d-flex gap-2">
            <a href="/invoice-error-finder" class="btn btn-outline-secondary">
                <i class="bi bi-arrow-left me-1"></i>Tilbage til dashboard
            </a>
            <button class="btn btn-primary" onclick="loadIssues()">
                <i class="bi bi-arrow-clockwise me-1"></i>Opdater
            </button>
        </div>
    </div>

    <div class="card border-0 shadow-sm mb-4">
        <div class="card-body">
            <div class="row g-3">
                <div class="col-12 col-md-3">
                    <label class="form-label">Status</label>
                    <select id="filterStatus" class="form-select" onchange="loadIssues()">
                        <option value="">Alle</option>
                        <option value="open" selected>Åben</option>
                        <option value="investigating">Under undersøgelse</option>
                        <option value="approved_change">Godkendt ændring</option>
                        <option value="error_found">Fejl fundet</option>
                        <option value="ready_to_invoice">Klar til fakturering</option>
                        <option value="invoiced">Faktureret</option>
                        <option value="ignored">Ignoreret</option>
                    </select>
                </div>
                <div class="col-12 col-md-3">
                    <label class="form-label">Fejltype</label>
                    <select id="filterType" class="form-select" onchange="loadIssues()">
                        <option value="">Alle</option>
                        <option value="missing_line">Manglende varelinje</option>
                        <option value="open_order_not_invoiced">Åben salgsordre ikke faktureret</option>
                        <option value="quantity_drop">Antalsfald</option>
                        <option value="price_change">Prisændring</option>
                    </select>
                </div>
                <div class="col-12 col-md-3">
                    <label class="form-label">Kunde</label>
                    <select id="filterCustomer" class="form-select" onchange="loadIssues()">
                        <option value="">Alle</option>
                        {% for customer in customers %}
                        <option value="{{ customer.id }}">{{ customer.name }}</option>
                        {% endfor %}
                    </select>
                </div>
                <div class="col-12 col-md-3">
                    <label class="form-label">Ansvarlig</label>
                    <select id="filterAssigned" class="form-select" onchange="loadIssues()">
                        <option value="">Alle</option>
                        <option value="null">Ikke tildelt</option>
                        {% for user in users %}
                        <option value="{{ user.user_id }}">{{ user.display_name }}</option>
                        {% endfor %}
                    </select>
                </div>
            </div>
        </div>
    </div>

    <div id="issuesStatus" class="alert d-none mb-4"></div>

    <div class="card border-0 shadow-sm">
        <div class="card-body p-0">
            <div class="table-responsive">
                <table class="table table-hover align-middle mb-0">
                    <thead class="table-light">
                        <tr>
                            <th>Kunde</th>
                            <th>Fejltype</th>
                            <th>Vare</th>
                            <th>Forventet</th>
                            <th>Faktisk</th>
                            <th>Periode</th>
                            <th>Beløb/impact</th>
                            <th>Status</th>
                            <th>Ansvarlig</th>
                            <th style="min-width: 220px;">Handling</th>
                        </tr>
                    </thead>
                    <tbody id="issuesBody">
                        <tr><td colspan="10" class="text-muted text-center py-4">Indlæser...</td></tr>
                    </tbody>
                </table>
            </div>
        </div>
    </div>

    <div class="d-flex justify-content-between align-items-center mt-3">
        <span class="text-muted small" id="paginationInfo"></span>
        <div class="btn-group" id="paginationControls"></div>
    </div>
</div>

<script>
let currentOffset = 0;
const pageSize = 100;

const issueTypeLabels = {
    missing_line: 'Manglende varelinje',
    open_order_not_invoiced: 'Åben salgsordre ikke faktureret',
    quantity_drop: 'Antalsfald',
    price_change: 'Prisændring',
    new_item_never_invoiced: 'Ny vare aldrig faktureret'
};

const statusLabels = {
    open: 'Åben',
    investigating: 'Under undersøgelse',
    approved_change: 'Godkendt ændring',
    error_found: 'Fejl fundet',
    ready_to_invoice: 'Klar til fakturering',
    invoiced: 'Faktureret',
    ignored: 'Ignoreret'
};

function escapeHtml(text) {
    if (text == null) return '';
    return String(text)
        .replaceAll('&', '&amp;')
        .replaceAll('<', '&lt;')
        .replaceAll('>', '&gt;')
        .replaceAll('"', '&quot;');
}

function formatCurrency(value) {
    if (value == null) return '-';
    return new Intl.NumberFormat('da-DK', { style: 'currency', currency: 'DKK' }).format(value);
}

function formatNumber(value) {
    if (value == null) return '-';
    return new Intl.NumberFormat('da-DK').format(value);
}

function statusBadge(status) {
    const map = {
        open: 'bg-danger',
        investigating: 'bg-warning text-dark',
        approved_change: 'bg-info text-dark',
        error_found: 'bg-danger',
        ready_to_invoice: 'bg-success',
        invoiced: 'bg-secondary',
        ignored: 'bg-light text-dark'
    };
    const cls = map[status] || 'bg-light text-dark';
    return `<span class="badge ${cls}">${statusLabels[status] || status}</span>`;
}

function buildQueryParams() {
    const params = new URLSearchParams();
    params.set('limit', pageSize);
    params.set('offset', currentOffset);

    const status = document.getElementById('filterStatus').value;
    if (status) params.set('status', status);

    const type = document.getElementById('filterType').value;
    if (type) params.set('issue_type', type);

    const customer = document.getElementById('filterCustomer').value;
    if (customer) params.set('customer_id', customer);

    const assigned = document.getElementById('filterAssigned').value;
    if (assigned === 'null') {
        params.set('assigned_user_id', 'null');
    } else if (assigned) {
        params.set('assigned_user_id', assigned);
    }

    return params;
}

async function loadIssues() {
    const body = document.getElementById('issuesBody');
    body.innerHTML = '<tr><td colspan="10" class="text-muted text-center py-4">Indlæser...</td></tr>';

    try {
        const params = buildQueryParams();
        const res = await fetch('/api/v1/invoice-error-finder/issues?' + params.toString());
        if (!res.ok) throw new Error('Kunne ikke hente fejlliste');
        const data = await res.json();

        if (data.items.length === 0) {
            body.innerHTML = '<tr><td colspan="10" class="text-muted text-center py-4">Ingen fejl fundet</td></tr>';
        } else {
            body.innerHTML = data.items.map(issue => `
                <tr>
                    <td>${escapeHtml(issue.customer_name || 'Ukendt kunde')}</td>
                    <td>${issueTypeLabels[issue.issue_type] || issue.issue_type}</td>
                    <td>${escapeHtml(issue.product_name || issue.product_number || '-')}</td>
                    <td>${formatNumber(issue.expected_quantity ?? issue.expected_price)}</td>
                    <td>${formatNumber(issue.actual_quantity ?? issue.actual_price)}</td>
                    <td>${issue.reference_period_start || '-'}</td>
                    <td>${formatCurrency(issue.amount_impact)}</td>
                    <td>${statusBadge(issue.status)}</td>
                    <td>${escapeHtml(issue.assigned_user_name || '-')}</td>
                    <td>
                        <div class="btn-group btn-group-sm">
                            ${renderActionButtons(issue)}
                        </div>
                    </td>
                </tr>
            `).join('');
        }

        document.getElementById('paginationInfo').textContent = `Viser ${data.items.length} af ${data.total} fejl`;
        renderPagination(data.total);
    } catch (err) {
        body.innerHTML = `<tr><td colspan="10" class="text-danger text-center py-4">Fejl: ${escapeHtml(err.message)}</td></tr>`;
    }
}

function renderActionButtons(issue) {
    if (issue.status === 'ignored') return '<span class="text-muted small">Ignoreret</span>';
    if (issue.status === 'invoiced') return '<span class="text-muted small">Faktureret</span>';

    return `
        <button class="btn btn-outline-success" title="Godkend" onclick="updateStatus(${issue.id}, 'approved_change')"><i class="bi bi-check"></i></button>
        <button class="btn btn-outline-warning" title="Under undersøgelse" onclick="updateStatus(${issue.id}, 'investigating')"><i class="bi bi-search"></i></button>
        <button class="btn btn-outline-primary" title="Klar til fakturering" onclick="createOrdreDraft(${issue.id})"><i class="bi bi-receipt"></i></button>
        <button class="btn btn-outline-info" title="Opret sag" onclick="createSag(${issue.id})"><i class="bi bi-folder-plus"></i></button>
        <button class="btn btn-outline-secondary" title="Ignorér" onclick="ignoreIssue(${issue.id})"><i class="bi bi-eye-slash"></i></button>
    `;
}

function renderPagination(total) {
    const controls = document.getElementById('paginationControls');
    const pages = Math.ceil(total / pageSize);
    if (pages <= 1) {
        controls.innerHTML = '';
        return;
    }

    const currentPage = Math.floor(currentOffset / pageSize);
    let html = `<button class="btn btn-outline-secondary" ${currentOffset === 0 ? 'disabled' : ''} onclick="goToPage(0)">«</button>`;
    for (let i = 0; i < pages; i++) {
        const active = i === currentPage ? 'active' : '';
        html += `<button class="btn btn-outline-secondary ${active}" onclick="goToPage(${i})">${i + 1}</button>`;
    }
    html += `<button class="btn btn-outline-secondary" ${currentOffset + pageSize >= total ? 'disabled' : ''} onclick="goToPage(${pages - 1})">»</button>`;
    controls.innerHTML = html;
}

function goToPage(page) {
    currentOffset = page * pageSize;
    loadIssues();
}

async function updateStatus(issueId, status) {
    try {
        const res = await fetch(`/api/v1/invoice-error-finder/issues/${issueId}/status`, {
            method: 'PATCH',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ status })
        });
        if (!res.ok) throw new Error('Opdatering fejlede');
        showStatus('Status opdateret', 'success');
        loadIssues();
    } catch (err) {
        showStatus('Fejl: ' + err.message, 'danger');
    }
}

async function createSag(issueId) {
    const titel = prompt('Titel på sag:');
    if (!titel) return;
    try {
        const res = await fetch(`/api/v1/invoice-error-finder/issues/${issueId}/create-sag`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ titel })
        });
        const data = await res.json();
        if (!res.ok) throw new Error(data.detail || 'Opret sag fejlede');
        showStatus(`Sag #${data.sag_id} oprettet`, 'success');
        loadIssues();
    } catch (err) {
        showStatus('Fejl: ' + err.message, 'danger');
    }
}

async function createOrdreDraft(issueId) {
    try {
        const res = await fetch(`/api/v1/invoice-error-finder/issues/${issueId}/create-ordre-draft`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({})
        });
        const data = await res.json();
        if (!res.ok) throw new Error(data.detail || 'Opret kladde fejlede');
        showStatus(`Ordrekladde #${data.draft_id} oprettet`, 'success');
        loadIssues();
    } catch (err) {
        showStatus('Fejl: ' + err.message, 'danger');
    }
}

async function ignoreIssue(issueId) {
    if (!confirm('Ignorér denne fejl?')) return;
    try {
        const res = await fetch(`/api/v1/invoice-error-finder/issues/${issueId}/ignore`, {
            method: 'POST'
        });
        if (!res.ok) throw new Error('Ignorér fejlede');
        showStatus('Fejl ignoreret', 'success');
        loadIssues();
    } catch (err) {
        showStatus('Fejl: ' + err.message, 'danger');
    }
}

function showStatus(message, type) {
    const el = document.getElementById('issuesStatus');
    el.className = `alert alert-${type} mb-4`;
    el.textContent = message;
    el.classList.remove('d-none');
    setTimeout(() => el.classList.add('d-none'), 4000);
}

loadIssues();
</script>
{% endblock %}