bmc_hub/app/opportunities/backend/router.py

"""
Opportunities (Pipeline) Router
Hub-local sales pipeline
"""

from pathlib import Path
from uuid import uuid4

from fastapi import APIRouter, HTTPException, Query, UploadFile, File, Form, Request
from fastapi.responses import FileResponse
from pydantic import BaseModel
from typing import Optional, List, Dict, Any, Tuple
from datetime import date, datetime
import json
import logging
import os
import shutil

import psycopg2

from app.core.config import settings
from app.core.database import execute_query, execute_query_single, execute_update
from app.services.opportunity_service import handle_stage_change
from app.services.email_service import EmailService
import email
from email.header import decode_header
try:
    import extract_msg
except ImportError:
    extract_msg = None

logger = logging.getLogger(__name__)
router = APIRouter()


def _is_undefined_table_error(exc: Exception) -> bool:
    # Postgres undefined_table SQLSTATE
    if getattr(exc, "pgcode", None) == "42P01":
        return True
    undefined_table = getattr(psycopg2, "errors", None)
    if undefined_table is not None:
        try:
            return isinstance(exc, psycopg2.errors.UndefinedTable)
        except Exception:
            return False
    return False

@router.post("/opportunities/{opportunity_id}/email-links", tags=["Opportunities"])
async def add_opportunity_email_link(opportunity_id: int, payload: dict):
    """Add a linked email to an opportunity"""
    email_id = payload.get("email_id")
    if not email_id or not isinstance(email_id, int):
        raise HTTPException(status_code=400, detail="Invalid email_id")
    
    try:
        _get_opportunity(opportunity_id)
    except HTTPException:
        raise HTTPException(status_code=404, detail="Opportunity not found")
        
    try:
        execute_query(
            "INSERT INTO pipeline_opportunity_emails (opportunity_id, email_id) VALUES (%s, %s) ON CONFLICT DO NOTHING",
            (opportunity_id, email_id)
        )
    except Exception as e:
        if _is_undefined_table_error(e):
            raise HTTPException(
                status_code=409,
                detail="Database migration required: run 032_opportunity_emails_m2m.sql",
            )
        logger.error(f"Failed to add email link: {e}")
        raise HTTPException(status_code=500, detail="Kunne ikke tilføje email-link")
    
    return _get_opportunity(opportunity_id)

@router.delete("/opportunities/{opportunity_id}/email-links/{email_id}", tags=["Opportunities"])
async def remove_opportunity_email_link(opportunity_id: int, email_id: int):
    """Remove a linked email from an opportunity"""
    try:
        execute_query(
            "DELETE FROM pipeline_opportunity_emails WHERE opportunity_id = %s AND email_id = %s",
            (opportunity_id, email_id)
        )
    except Exception as e:
        if _is_undefined_table_error(e):
            raise HTTPException(
                status_code=409,
                detail="Database migration required: run 032_opportunity_emails_m2m.sql",
            )
        logger.error(f"Failed to remove email link: {e}")
        raise HTTPException(status_code=500, detail="Kunne ikke fjerne email-link")
    
    return {"success": True}

@router.patch("/opportunities/{opportunity_id}/email-link", tags=["Opportunities"])
async def update_opportunity_email_link(opportunity_id: int, payload: dict):
    """Legacy endpoint: Update the linked email (single) -> Redirects to add link"""
    # For backward compatibility, we treat this as "add link" for now
    return await add_opportunity_email_link(opportunity_id, payload)


def _decode_header_str(header_val):
    if not header_val:
        return ""
    try:
        decoded_list = decode_header(header_val)
        result = ""
        for content, encoding in decoded_list:
            if isinstance(content, bytes):
                if encoding:
                    try:
                        result += content.decode(encoding)
                    except LookupError:
                        result += content.decode('utf-8', errors='ignore')
                    except Exception:
                         result += content.decode('utf-8', errors='ignore')
                else:
                    result += content.decode('utf-8', errors='ignore')
            else:
                result += str(content)
        return result
    except Exception:
        return str(header_val)

async def _process_uploaded_email(file: UploadFile, opportunity_id: int) -> dict:
    content = await file.read()
    filename = file.filename.lower()
    email_data = {}
    
    # Generate a unique message ID if one doesn't exist to prevent collisions/logic errors
    temp_id = str(uuid4())

    if filename.endswith('.msg'):
         if not extract_msg:
             raise HTTPException(status_code=500, detail="Library 'extract-msg' not installed")
         
         # extract-msg needs a file-like object or path. BytesIO works.
         import io
         msg = extract_msg.Message(io.BytesIO(content))
         
         # Map fields
         email_data = {
             'message_id': msg.messageId or f"msg-{temp_id}",
             'subject': msg.subject or "No Subject",
             'sender_email': msg.sender or "",
             'sender_name': msg.sender or "", # msg.sender is often "Name <email>" or just email
             'recipient_email': msg.to or "",
             'cc': msg.cc or "",
             'body_text': msg.body,
             'body_html': msg.htmlBody, # might be None
             'received_date': msg.date or datetime.now(),
             'folder': 'Imported',
             'attachment_count': len(msg.attachments),
             'has_attachments': len(msg.attachments) > 0,
             'attachments': []
         }
         
         # Handle msg attachments (simplified, might need more work for full fidelity)
         for att in msg.attachments:
             # Binary attachments in msg
             if hasattr(att, 'data'):
                email_data['attachments'].append({
                    'filename': att.longFilename or att.shortFilename or 'attachment',
                    'content': att.data,
                    'size': len(att.data),
                    'content_type': 'application/octet-stream' 
                })

    elif filename.endswith('.eml'):
        msg = email.message_from_bytes(content)
        
        # Helper to get body
        body_text = ""
        body_html = ""
        if msg.is_multipart():
            for part in msg.walk():
                ctype = part.get_content_type()
                if ctype == "text/plain" and not body_text:
                    body_text = part.get_payload(decode=True).decode('utf-8', errors='ignore')
                elif ctype == "text/html" and not body_html:
                    body_html = part.get_payload(decode=True).decode('utf-8', errors='ignore')
        else:
            body_text = msg.get_payload(decode=True).decode('utf-8', errors='ignore')

        # Attachments
        attachments = []
        for part in msg.walk():
            if part.get_content_maintype() == 'multipart': continue
            if part.get_content_type() in ['text/plain', 'text/html']: continue
            fname = part.get_filename()
            if fname:
                payload = part.get_payload(decode=True)
                if payload:
                    attachments.append({
                        'filename': _decode_header_str(fname),
                        'content': payload,
                        'size': len(payload),
                        'content_type': part.get_content_type()
                    })

        email_data = {
            'message_id': msg.get('Message-ID', f"eml-{temp_id}"),
            'subject': _decode_header_str(msg.get('Subject', 'No Subject')),
            'sender_email': _decode_header_str(msg.get('From', '')),
            'sender_name': _decode_header_str(msg.get('From', '')),
            'recipient_email': _decode_header_str(msg.get('To', '')),
            'cc': _decode_header_str(msg.get('Cc', '')),
            'body_text': body_text,
            'body_html': body_html,
            'received_date': datetime.now(), # EML date parsing is complex, default to now for import
            'folder': 'Imported',
            'has_attachments': len(attachments) > 0,
            'attachment_count': len(attachments),
            'attachments': attachments
        }
        
        # Try parse date
        if msg.get('Date'):
             try:
                 from email.utils import parsedate_to_datetime
                 email_data['received_date'] = parsedate_to_datetime(msg.get('Date'))
             except: pass

    else:
        raise HTTPException(status_code=400, detail="Unsupported file format. Use .eml or .msg")

    # Save via EmailService
    svc = EmailService()
    
    # Check if exists (by message_id)
    # The svc.save_email method inserts. We might want to check for duplicates first?
    # save_email returns id if new, or might fail? 
    # Actually email_messages table likely has unique constraint on message_id? 
    # Let's check save_email again. It does INSERT.
    # We should search first.
    
    # Simple check query
    existing = execute_query_single("SELECT id FROM email_messages WHERE message_id = %s", (email_data['message_id'],))
    if existing:
        email_id = existing['id']
    else:
        email_id = await svc.save_email(email_data)
        if not email_id:
             raise HTTPException(status_code=500, detail="Failed to save imported email")

    # Link to opportunity
    try:
        execute_query(
            "INSERT INTO pipeline_opportunity_emails (opportunity_id, email_id) VALUES (%s, %s) ON CONFLICT DO NOTHING",
            (opportunity_id, email_id)
        )
    except Exception as e:
        logger.error(f"Failed to link imported email: {e}")
        raise HTTPException(status_code=500, detail="Failed to link email")
        
    return _get_opportunity(opportunity_id)


@router.post("/opportunities/{opportunity_id}/upload-email", tags=["Opportunities"])
async def upload_opportunity_email(opportunity_id: int, file: UploadFile = File(...)):
    """Upload an .eml or .msg file and link it to the opportunity"""
    return await _process_uploaded_email(file, opportunity_id)


@router.post("/opportunities/{opportunity_id}/contacts", tags=["Opportunities"])
async def add_opportunity_contact_link(opportunity_id: int, payload: dict):
    """Link a contact to an opportunity"""
    contact_id = payload.get("contact_id")
    role = payload.get("role")
    
    if not contact_id:
        raise HTTPException(status_code=400, detail="Invalid contact_id")
        
    try:
        execute_query(
            "INSERT INTO pipeline_opportunity_contacts (opportunity_id, contact_id, role) VALUES (%s, %s, %s) ON CONFLICT (opportunity_id, contact_id) DO UPDATE SET role = EXCLUDED.role",
            (opportunity_id, contact_id, role)
        )
    except Exception as e:
        logger.error(f"Failed to add contact link: {e}")
        raise HTTPException(status_code=500, detail="Kunne ikke tilføje kontaktperson")
    
    return _get_opportunity(opportunity_id)


@router.delete("/opportunities/{opportunity_id}/contacts/{contact_id}", tags=["Opportunities"])
async def remove_opportunity_contact_link(opportunity_id: int, contact_id: int):
    """Remove a linked contact from an opportunity"""
    try:
        execute_query(
            "DELETE FROM pipeline_opportunity_contacts WHERE opportunity_id = %s AND contact_id = %s",
            (opportunity_id, contact_id)
        )
    except Exception as e:
        logger.error(f"Failed to remove contact link: {e}")
        raise HTTPException(status_code=500, detail="Kunne ikke fjerne kontaktperson")
    
    return _get_opportunity(opportunity_id)


UPLOAD_BASE_PATH = Path(settings.UPLOAD_DIR).resolve()
COMMENT_ATTACHMENT_SUBDIR = "opportunity_comments"
CONTRACT_ATTACHMENT_SUBDIR = "opportunity_contract_files"
for subdir in (COMMENT_ATTACHMENT_SUBDIR, CONTRACT_ATTACHMENT_SUBDIR):
    (UPLOAD_BASE_PATH / subdir).mkdir(parents=True, exist_ok=True)
ALLOWED_EXTENSIONS = {ext.lower() for ext in settings.ALLOWED_EXTENSIONS}
MAX_ATTACHMENT_SIZE = settings.EMAIL_MAX_UPLOAD_SIZE_MB * 1024 * 1024


def _is_attachment_allowed(filename: str) -> bool:
    extension = Path(filename).suffix.lower().lstrip(".")
    return extension in ALLOWED_EXTENSIONS


def _validate_attachment(upload_file: UploadFile) -> None:
    if not _is_attachment_allowed(upload_file.filename):
        raise HTTPException(400, detail="Unsupported attachment type")

    upload_file.file.seek(0, os.SEEK_END)
    size = upload_file.file.tell()
    upload_file.file.seek(0)
    if size > MAX_ATTACHMENT_SIZE:
        raise HTTPException(
            400,
            detail=f"Attachment exceeds size limit of {settings.EMAIL_MAX_UPLOAD_SIZE_MB} MB",
        )


def _generate_stored_name(filename: str, subdir: str) -> str:
    cleaned = Path(filename).name
    unique = f"{uuid4().hex}_{cleaned}"
    return f"{subdir}/{unique}"


def _resolve_attachment_path(stored_name: str) -> Path:
    return UPLOAD_BASE_PATH / stored_name


def _store_upload_file(upload_file: UploadFile, subdir: str) -> Tuple[str, int]:
    _validate_attachment(upload_file)
    stored_name = _generate_stored_name(upload_file.filename, subdir)
    destination = _resolve_attachment_path(stored_name)
    destination.parent.mkdir(parents=True, exist_ok=True)
    upload_file.file.seek(0)
    try:
        with destination.open("wb") as buffer:
            shutil.copyfileobj(upload_file.file, buffer)
    except PermissionError as e:
        logger.error(
            "❌ Upload permission denied: %s (base=%s, subdir=%s)",
            str(destination),
            str(UPLOAD_BASE_PATH),
            subdir,
        )
        raise HTTPException(
            status_code=500,
            detail=(
                "Upload directory is not writable. Fix permissions for the host-mounted 'uploads' folder "
                "(e.g. /srv/podman/bmc_hub_v1.0/uploads) and restart the API container."
            ),
        ) from e
    return stored_name, destination.stat().st_size


class PipelineStageBase(BaseModel):
    name: str
    description: Optional[str] = None
    sort_order: int = 0
    default_probability: int = 0
    color: Optional[str] = "#0f4c75"
    is_won: bool = False
    is_lost: bool = False
    is_active: bool = True


class PipelineStageCreate(PipelineStageBase):
    pass


class PipelineStageUpdate(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    sort_order: Optional[int] = None
    default_probability: Optional[int] = None
    color: Optional[str] = None
    is_won: Optional[bool] = None
    is_lost: Optional[bool] = None
    is_active: Optional[bool] = None


class OpportunityBase(BaseModel):
    customer_id: int
    title: str
    description: Optional[str] = None
    amount: Optional[float] = 0
    currency: Optional[str] = "DKK"
    expected_close_date: Optional[date] = None
    stage_id: Optional[int] = None
    owner_user_id: Optional[int] = None


class OpportunityCreate(OpportunityBase):
    pass


class OpportunityUpdate(BaseModel):
    title: Optional[str] = None
    description: Optional[str] = None
    amount: Optional[float] = None
    currency: Optional[str] = None
    expected_close_date: Optional[date] = None
    stage_id: Optional[int] = None
    owner_user_id: Optional[int] = None
    is_active: Optional[bool] = None


class OpportunityStageUpdate(BaseModel):
    stage_id: int
    note: Optional[str] = None
    user_id: Optional[int] = None


class OpportunityLineBase(BaseModel):
    name: str
    quantity: int = 1
    unit_price: float = 0.0
    product_number: Optional[str] = None
    description: Optional[str] = None


class OpportunityLineCreate(OpportunityLineBase):
    pass


class OpportunityCommentBase(BaseModel):
    content: str
    author_name: Optional[str] = None
    user_id: Optional[int] = None
    email_id: Optional[int] = None
    contract_number: Optional[str] = None
    contract_context: Optional[str] = None
    contract_link: Optional[str] = None
    metadata: Optional[Dict] = None


class OpportunityCommentCreate(OpportunityCommentBase):
    pass


class OpportunityCommentAttachment(BaseModel):
    id: int
    filename: str
    content_type: Optional[str] = None
    size_bytes: Optional[int] = None
    created_at: datetime
    download_url: str


class OpportunityEmailAttachment(BaseModel):
    id: int
    filename: str
    content_type: Optional[str] = None
    size_bytes: Optional[int] = None
    created_at: datetime
    download_url: str


class OpportunityContractFile(BaseModel):
    id: int
    filename: str
    content_type: Optional[str] = None
    size_bytes: Optional[int] = None
    created_at: datetime
    download_url: str


class OpportunityCommentResponse(BaseModel):
    id: int
    opportunity_id: int
    content: str
    author_name: Optional[str] = None
    user_id: Optional[int] = None
    user_full_name: Optional[str] = None
    username: Optional[str] = None
    email_id: Optional[int] = None
    email_subject: Optional[str] = None
    email_sender: Optional[str] = None
    contract_number: Optional[str] = None
    contract_context: Optional[str] = None
    contract_link: Optional[str] = None
    metadata: Optional[Dict] = None
    created_at: datetime
    updated_at: datetime
    attachments: List[OpportunityCommentAttachment] = []
    email_attachments: List[OpportunityEmailAttachment] = []


def _get_stage(stage_id: int):
    stage = execute_query_single(
        "SELECT * FROM pipeline_stages WHERE id = %s AND is_active = TRUE",
        (stage_id,)
    )
    if not stage:
        raise HTTPException(status_code=404, detail="Stage not found")
    return stage


def _get_default_stage():
    stage = execute_query_single(
        "SELECT * FROM pipeline_stages WHERE is_active = TRUE ORDER BY sort_order ASC LIMIT 1"
    )
    if not stage:
        raise HTTPException(status_code=400, detail="No active stages configured")
    return stage


def _get_opportunity(opportunity_id: int):
    query = """
        SELECT o.*, c.name AS customer_name,
               s.name AS stage_name, s.color AS stage_color, s.is_won, s.is_lost
        FROM pipeline_opportunities o
        JOIN customers c ON c.id = o.customer_id
        JOIN pipeline_stages s ON s.id = o.stage_id
        WHERE o.id = %s
    """
    opportunity = execute_query_single(query, (opportunity_id,))
    if not opportunity:
        raise HTTPException(status_code=404, detail="Opportunity not found")
    
    # Fetch linked emails
    email_query = """
        SELECT e.id, e.subject, e.sender_email, e.received_date, e.body_text, e.body_html
        FROM email_messages e
        JOIN pipeline_opportunity_emails poe ON e.id = poe.email_id
        WHERE poe.opportunity_id = %s
        ORDER BY e.received_date DESC
    """
    linked_emails = execute_query(email_query, (opportunity_id,))
    try:
        linked_emails = execute_query(email_query, (opportunity_id,))
    except Exception as e:
        if _is_undefined_table_error(e):
            logger.warning(
                "⚠️ Missing table pipeline_opportunity_emails; linked_emails disabled until migration 032_opportunity_emails_m2m.sql is applied"
            )
            linked_emails = []
        else:
            raise
    opportunity["linked_emails"] = linked_emails or []
    
    # Fetch linked contacts
    contacts_query = """
        SELECT c.id, c.first_name, c.last_name, c.email, c.phone, c.mobile, poc.role
        FROM contacts c
        JOIN pipeline_opportunity_contacts poc ON c.id = poc.contact_id
        WHERE poc.opportunity_id = %s
        ORDER BY c.first_name, c.last_name
    """
    linked_contacts = execute_query(contacts_query, (opportunity_id,))
    try:
        linked_contacts = execute_query(contacts_query, (opportunity_id,))
    except Exception as e:
        if _is_undefined_table_error(e):
            logger.warning(
                "⚠️ Missing table pipeline_opportunity_contacts; linked_contacts disabled until migration 033_opportunity_contacts.sql is applied"
            )
            linked_contacts = []
        else:
            raise
    opportunity["linked_contacts"] = linked_contacts or []
    
    return opportunity


def _insert_stage_history(opportunity_id: int, from_stage_id: Optional[int], to_stage_id: int,
                          user_id: Optional[int] = None, note: Optional[str] = None):
    execute_query(
        """
        INSERT INTO pipeline_stage_history (opportunity_id, from_stage_id, to_stage_id, changed_by_user_id, note)
        VALUES (%s, %s, %s, %s, %s)
        """,
        (opportunity_id, from_stage_id, to_stage_id, user_id, note)
    )


def _fetch_opportunity_comments(opportunity_id: int):
    query = """
        SELECT c.*, u.full_name AS user_full_name, u.username,
               em.subject AS email_subject, em.sender_email AS email_sender
        FROM pipeline_opportunity_comments c
        LEFT JOIN users u ON u.user_id = c.user_id
        LEFT JOIN email_messages em ON em.id = c.email_id
        WHERE c.opportunity_id = %s
        ORDER BY c.created_at DESC
    """
    comments = execute_query(query, (opportunity_id,)) or []
    if not comments:
        return []

    comment_ids = [comment["id"] for comment in comments]
    attachments_map = _fetch_comment_attachments_map(comment_ids)
    email_ids = list({comment["email_id"] for comment in comments if comment.get("email_id")})
    email_attachment_map = _fetch_email_attachments_map(email_ids)

    for comment in comments:
        comment["attachments"] = attachments_map.get(comment["id"], [])
        if comment.get("email_id"):
            comment["email_attachments"] = email_attachment_map.get(comment["email_id"], [])
        else:
            comment["email_attachments"] = []

    return comments


def _fetch_comment(comment_id: int):
    query = """
        SELECT c.*, u.full_name AS user_full_name, u.username,
               em.subject AS email_subject, em.sender_email AS email_sender
        FROM pipeline_opportunity_comments c
        LEFT JOIN users u ON u.user_id = c.user_id
        LEFT JOIN email_messages em ON em.id = c.email_id
        WHERE c.id = %s
    """
    result = execute_query(query, (comment_id,))
    if not result:
        return None

    comment = result[0]
    attachments = _fetch_comment_attachments_map([comment_id])
    comment["attachments"] = attachments.get(comment_id, [])
    if comment.get("email_id"):
        email_attachments = _fetch_email_attachments_map([comment["email_id"]])
        comment["email_attachments"] = email_attachments.get(comment["email_id"], [])
    else:
        comment["email_attachments"] = []

    return comment


def _comment_attachment_download_url(opportunity_id: int, attachment_id: int) -> str:
    return f"/api/v1/opportunities/{opportunity_id}/comment-attachments/{attachment_id}"


def _email_attachment_download_url(email_id: int, attachment_id: int) -> str:
    return f"/api/v1/emails/{email_id}/attachments/{attachment_id}"


def _fetch_comment_attachments_map(comment_ids: List[int]) -> Dict[int, List[Dict[str, Any]]]:
    if not comment_ids:
        return {}

    query = """
        SELECT a.id, a.comment_id, a.opportunity_id, a.filename, a.content_type, a.size_bytes, a.created_at
        FROM pipeline_opportunity_comment_attachments a
        WHERE a.comment_id = ANY(%s)
        ORDER BY a.created_at DESC
    """
    rows = execute_query(query, (comment_ids,)) or []
    attachments_by_comment: Dict[int, List[Dict[str, Any]]] = {}
    for row in rows:
        attachments_by_comment.setdefault(row["comment_id"], []).append({
            "id": row["id"],
            "filename": row["filename"],
            "content_type": row.get("content_type"),
            "size_bytes": row.get("size_bytes"),
            "created_at": row.get("created_at"),
            "download_url": _comment_attachment_download_url(row["opportunity_id"], row["id"])
        })
    return attachments_by_comment


def _fetch_email_attachments_map(email_ids: List[int]) -> Dict[int, List[Dict[str, Any]]]:
    if not email_ids:
        return {}

    query = """
        SELECT id, email_id, filename, content_type, size_bytes, created_at
        FROM email_attachments
        WHERE email_id = ANY(%s)
        ORDER BY id ASC
    """
    rows = execute_query(query, (email_ids,)) or []
    email_map: Dict[int, List[Dict[str, Any]]] = {}
    for row in rows:
        email_map.setdefault(row["email_id"], []).append({
            "id": row["id"],
            "filename": row["filename"],
            "content_type": row.get("content_type"),
            "size_bytes": row.get("size_bytes"),
            "created_at": row.get("created_at"),
            "download_url": _email_attachment_download_url(row["email_id"], row["id"])
        })
    return email_map


def _contract_file_download_url(opportunity_id: int, file_id: int) -> str:
    return f"/api/v1/opportunities/{opportunity_id}/contract-files/{file_id}"


def _fetch_contract_files(opportunity_id: int) -> List[Dict[str, Any]]:
    query = """
        SELECT id, filename, content_type, size_bytes, stored_name, created_at
        FROM pipeline_opportunity_contract_files
        WHERE opportunity_id = %s
        ORDER BY created_at DESC
    """
    rows = execute_query(query, (opportunity_id,)) or []
    return [
        {
            "id": row["id"],
            "filename": row["filename"],
            "content_type": row.get("content_type"),
            "size_bytes": row.get("size_bytes"),
            "created_at": row.get("created_at"),
            "download_url": _contract_file_download_url(opportunity_id, row["id"]),
        }
        for row in rows
    ]


def _save_contract_files(opportunity_id: int, files: List[UploadFile], uploaded_by_user_id: Optional[int] = None) -> List[Dict[str, Any]]:
    if not files:
        return []

    insert_query = """
        INSERT INTO pipeline_opportunity_contract_files
            (opportunity_id, filename, content_type, size_bytes, stored_name, uploaded_by_user_id)
        VALUES (%s, %s, %s, %s, %s, %s)
        RETURNING id, filename, content_type, size_bytes, created_at
    """

    saved_files = []
    for upload_file in files:
        if not upload_file or not upload_file.filename:
            continue

        stored_name, size_bytes = _store_upload_file(upload_file, CONTRACT_ATTACHMENT_SUBDIR)
        result = execute_query(
            insert_query,
            (
                opportunity_id,
                upload_file.filename,
                upload_file.content_type,
                size_bytes,
                stored_name,
                uploaded_by_user_id,
            )
        )
        if result:
            saved = result[0]
            saved_files.append({
                "id": saved["id"],
                "filename": saved["filename"],
                "content_type": saved.get("content_type"),
                "size_bytes": saved.get("size_bytes"),
                "created_at": saved.get("created_at"),
                "download_url": _contract_file_download_url(opportunity_id, saved["id"]),
            })

    return saved_files
def _save_comment_attachments(opportunity_id: int, comment_id: int, files: List[UploadFile], uploaded_by_user_id: Optional[int] = None) -> None:
    if not files:
        return

    insert_query = """
        INSERT INTO pipeline_opportunity_comment_attachments
            (opportunity_id, comment_id, filename, content_type, size_bytes, stored_name, uploaded_by_user_id)
        VALUES (%s, %s, %s, %s, %s, %s, %s)
    """

    for upload_file in files:
        if not upload_file or not upload_file.filename:
            continue

        stored_name, size_bytes = _store_upload_file(upload_file, COMMENT_ATTACHMENT_SUBDIR)
        execute_query(
            insert_query,
            (
                opportunity_id,
                comment_id,
                upload_file.filename,
                upload_file.content_type,
                size_bytes,
                stored_name,
                uploaded_by_user_id,
            )
        )


# ============================
# Pipeline Stages
# ============================

@router.get("/pipeline/stages", tags=["Pipeline Stages"])
async def list_stages():
    query = "SELECT * FROM pipeline_stages WHERE is_active = TRUE ORDER BY sort_order ASC"
    return execute_query(query) or []


@router.post("/pipeline/stages", tags=["Pipeline Stages"])
async def create_stage(stage: PipelineStageCreate):
    query = """
        INSERT INTO pipeline_stages
        (name, description, sort_order, default_probability, color, is_won, is_lost, is_active)
        VALUES (%s, %s, %s, %s, %s, %s, %s, %s)
        RETURNING *
    """
    result = execute_query(query, (
        stage.name,
        stage.description,
        stage.sort_order,
        stage.default_probability,
        stage.color,
        stage.is_won,
        stage.is_lost,
        stage.is_active
    ))
    logger.info("✅ Created pipeline stage: %s", stage.name)
    return result[0] if result else None


@router.put("/pipeline/stages/{stage_id}", tags=["Pipeline Stages"])
async def update_stage(stage_id: int, stage: PipelineStageUpdate):
    updates = []
    params = []
    for field, value in stage.dict(exclude_unset=True).items():
        updates.append(f"{field} = %s")
        params.append(value)

    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")

    params.append(stage_id)
    query = f"UPDATE pipeline_stages SET {', '.join(updates)}, updated_at = CURRENT_TIMESTAMP WHERE id = %s RETURNING *"
    result = execute_query(query, tuple(params))

    if not result:
        raise HTTPException(status_code=404, detail="Stage not found")

    logger.info("✅ Updated pipeline stage: %s", stage_id)
    return result[0]


@router.delete("/pipeline/stages/{stage_id}", tags=["Pipeline Stages"])
async def deactivate_stage(stage_id: int):
    affected = execute_update(
        "UPDATE pipeline_stages SET is_active = FALSE, updated_at = CURRENT_TIMESTAMP WHERE id = %s",
        (stage_id,)
    )
    if not affected:
        raise HTTPException(status_code=404, detail="Stage not found")
    logger.info("⚠️ Deactivated pipeline stage: %s", stage_id)
    return {"status": "success", "stage_id": stage_id}


# ============================
# Opportunities
# ============================

@router.get("/opportunities", tags=["Opportunities"])
async def list_opportunities(customer_id: Optional[int] = None, stage_id: Optional[int] = None):
    query = """
        SELECT o.*, c.name AS customer_name,
               s.name AS stage_name, s.color AS stage_color, s.is_won, s.is_lost
        FROM pipeline_opportunities o
        JOIN customers c ON c.id = o.customer_id
        JOIN pipeline_stages s ON s.id = o.stage_id
        WHERE o.is_active = TRUE
    """
    params: List = []
    if customer_id is not None:
        query += " AND o.customer_id = %s"
        params.append(customer_id)
    if stage_id is not None:
        query += " AND o.stage_id = %s"
        params.append(stage_id)

    query += " ORDER BY o.updated_at DESC NULLS LAST, o.created_at DESC"
    if params:
        return execute_query(query, tuple(params)) or []
    return execute_query(query) or []


@router.get("/opportunities/{opportunity_id}", tags=["Opportunities"])
async def get_opportunity(opportunity_id: int):
    return _get_opportunity(opportunity_id)


@router.post("/opportunities", tags=["Opportunities"])
async def create_opportunity(opportunity: OpportunityCreate):
    stage = _get_stage(opportunity.stage_id) if opportunity.stage_id else _get_default_stage()
    probability = stage["default_probability"]

    query = """
        INSERT INTO pipeline_opportunities
        (customer_id, title, description, amount, currency, expected_close_date, stage_id, probability, owner_user_id)
        VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s)
        RETURNING id
    """
    result = execute_query(query, (
        opportunity.customer_id,
        opportunity.title,
        opportunity.description,
        opportunity.amount or 0,
        opportunity.currency or "DKK",
        opportunity.expected_close_date,
        stage["id"],
        probability,
        opportunity.owner_user_id
    ))

    if not result:
        raise HTTPException(status_code=500, detail="Failed to create opportunity")

    opportunity_id = result[0]["id"]
    _insert_stage_history(opportunity_id, None, stage["id"], opportunity.owner_user_id, "Oprettet")
    logger.info("✅ Created opportunity %s", opportunity_id)
    return _get_opportunity(opportunity_id)


@router.put("/opportunities/{opportunity_id}", tags=["Opportunities"])
async def update_opportunity(opportunity_id: int, update: OpportunityUpdate):
    existing = _get_opportunity(opportunity_id)
    updates = []
    params = []

    update_dict = update.dict(exclude_unset=True)
    stage_changed = False
    new_stage = None

    if "stage_id" in update_dict:
        new_stage = _get_stage(update_dict["stage_id"])
        update_dict["probability"] = new_stage["default_probability"]
        stage_changed = new_stage["id"] != existing["stage_id"]

    for field, value in update_dict.items():
        updates.append(f"{field} = %s")
        params.append(value)

    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")

    params.append(opportunity_id)
    query = f"UPDATE pipeline_opportunities SET {', '.join(updates)}, updated_at = CURRENT_TIMESTAMP WHERE id = %s"
    execute_update(query, tuple(params))

    if stage_changed and new_stage:
        _insert_stage_history(opportunity_id, existing["stage_id"], new_stage["id"], update.owner_user_id, "Stage ændret")
        updated = _get_opportunity(opportunity_id)
        handle_stage_change(updated, new_stage)

    return _get_opportunity(opportunity_id)


@router.patch("/opportunities/{opportunity_id}/stage", tags=["Opportunities"])
async def update_opportunity_stage(opportunity_id: int, update: OpportunityStageUpdate):
    existing = _get_opportunity(opportunity_id)
    new_stage = _get_stage(update.stage_id)

    execute_update(
        """
        UPDATE pipeline_opportunities
        SET stage_id = %s,
            probability = %s,
            updated_at = CURRENT_TIMESTAMP
        WHERE id = %s
        """,
        (new_stage["id"], new_stage["default_probability"], opportunity_id)
    )

    _insert_stage_history(opportunity_id, existing["stage_id"], new_stage["id"], update.user_id, update.note)
    updated = _get_opportunity(opportunity_id)
    handle_stage_change(updated, new_stage)

    return updated


@router.get("/opportunities/{opportunity_id}/lines", tags=["Opportunities"])
async def list_opportunity_lines(opportunity_id: int):
    query = """
        SELECT id, opportunity_id, product_number, name, description, quantity, unit_price,
               quantity * unit_price AS total_price
        FROM pipeline_opportunity_lines
        WHERE opportunity_id = %s
        ORDER BY id ASC
    """
    return execute_query(query, (opportunity_id,)) or []


@router.post("/opportunities/{opportunity_id}/lines", tags=["Opportunities"])
async def add_opportunity_line(opportunity_id: int, line: OpportunityLineCreate):
    query = """
        INSERT INTO pipeline_opportunity_lines
        (opportunity_id, product_number, name, description, quantity, unit_price)
        VALUES (%s, %s, %s, %s, %s, %s)
        RETURNING id, opportunity_id, product_number, name, description, quantity, unit_price,
                  quantity * unit_price AS total_price
    """
    result = execute_query(
        query,
        (
            opportunity_id,
            line.product_number,
            line.name,
            line.description,
            line.quantity,
            line.unit_price
        )
    )
    if not result:
        raise HTTPException(status_code=500, detail="Failed to create line item")
    return result[0]


@router.delete("/opportunities/{opportunity_id}/lines/{line_id}", tags=["Opportunities"])
async def remove_opportunity_line(opportunity_id: int, line_id: int):
    query = """
        DELETE FROM pipeline_opportunity_lines
        WHERE opportunity_id = %s AND id = %s
        RETURNING id
    """
    result = execute_query(query, (opportunity_id, line_id))
    if not result:
        raise HTTPException(status_code=404, detail="Line item not found")
    return {"success": True, "line_id": line_id}


@router.get(
    "/opportunities/{opportunity_id}/comments",
    response_model=List[OpportunityCommentResponse],
    tags=["Opportunities"]
)
async def list_opportunity_comments(opportunity_id: int):
    _get_opportunity(opportunity_id)
    return _fetch_opportunity_comments(opportunity_id)


@router.post(
    "/opportunities/{opportunity_id}/comments",
    response_model=OpportunityCommentResponse,
    tags=["Opportunities"]
)
async def add_opportunity_comment(
    opportunity_id: int,
    request: Request,
    content: Optional[str] = Form(None),
    author_name: Optional[str] = Form(None),
    user_id: Optional[int] = Form(None),
    email_id: Optional[int] = Form(None),
    contract_number: Optional[str] = Form(None),
    contract_context: Optional[str] = Form(None),
    contract_link: Optional[str] = Form(None),
    metadata: Optional[str] = Form(None),
    files: Optional[List[UploadFile]] = File(None),
):
    _get_opportunity(opportunity_id)

    if request.headers.get("content-type", "").startswith("application/json"):
        payload: Dict[str, Any] = await request.json()
    else:
        payload = {
            "content": content,
            "author_name": author_name,
            "user_id": user_id,
            "email_id": email_id,
            "contract_number": contract_number,
            "contract_context": contract_context,
            "contract_link": contract_link,
            "metadata": metadata,
        }

    content_value = payload.get("content")
    if not content_value:
        raise HTTPException(status_code=400, detail="Kommentar er påkrævet")

    resolved_author = payload.get("author_name") or 'Hub Bruger'
    resolved_user_id = payload.get("user_id")
    if isinstance(resolved_user_id, str):
        try:
            resolved_user_id = int(resolved_user_id)
        except ValueError:
            resolved_user_id = None

    resolved_email_id = payload.get("email_id")
    if isinstance(resolved_email_id, str):
        try:
            resolved_email_id = int(resolved_email_id)
        except ValueError:
            resolved_email_id = None
    metadata_payload = payload.get("metadata")
    metadata_obj = None
    if metadata_payload:
        if isinstance(metadata_payload, str):
            try:
                metadata_obj = json.loads(metadata_payload)
            except json.JSONDecodeError:
                metadata_obj = None
        elif isinstance(metadata_payload, dict):
            metadata_obj = metadata_payload
    metadata_json = json.dumps(metadata_obj) if metadata_obj else None

    query = """
        INSERT INTO pipeline_opportunity_comments
            (opportunity_id, user_id, author_name, content, email_id,
             contract_number, contract_context, contract_link, metadata)
        VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s)
        RETURNING id
    """

    result = execute_query(
        query,
        (
            opportunity_id,
            resolved_user_id,
            resolved_author,
            content_value,
            resolved_email_id,
            payload.get("contract_number"),
            payload.get("contract_context"),
            payload.get("contract_link"),
            metadata_json
        )
    )

    if not result:
        raise HTTPException(status_code=500, detail="Kunne ikke oprette kommentar")

    comment_id = result[0]["id"]
    attachment_files = files or []
    if attachment_files:
        _save_comment_attachments(opportunity_id, comment_id, attachment_files, resolved_user_id)

    return _fetch_comment(comment_id)


@router.get("/opportunities/{opportunity_id}/comment-attachments/{attachment_id}", tags=["Opportunities"])
async def download_comment_attachment(opportunity_id: int, attachment_id: int):
    query = """
        SELECT * FROM pipeline_opportunity_comment_attachments
        WHERE id = %s AND opportunity_id = %s
    """
    result = execute_query(query, (attachment_id, opportunity_id))
    if not result:
        raise HTTPException(status_code=404, detail="Vedhæftet fil ikke fundet")

    attachment = result[0]
    stored_name = attachment.get("stored_name")
    if not stored_name:
        raise HTTPException(status_code=500, detail="Vedhæftet fil mangler sti")

    file_path = _resolve_attachment_path(stored_name)
    if not file_path.exists():
        raise HTTPException(status_code=404, detail="Filen findes ikke på serveren")

    return FileResponse(
        path=file_path,
        filename=attachment.get("filename"),
        media_type=attachment.get("content_type") or "application/octet-stream"
    )


@router.get(
    "/contracts/search",
    tags=["Opportunities"],
    response_model=List[Dict]
)
async def search_contracts(query: str = Query(..., min_length=2), limit: int = Query(10, ge=1, le=50)):
    sql = """
        SELECT contract_number,
               MAX(created_at) AS last_seen,
               COUNT(*) AS hits
        FROM extraction_lines
        WHERE contract_number IS NOT NULL
          AND contract_number <> ''
          AND contract_number ILIKE %s
        GROUP BY contract_number
        ORDER BY MAX(created_at) DESC
        LIMIT %s
    """
    params = (f"%{query}%", limit)
    results = execute_query(sql, params)
    return results or []


@router.get(
    "/opportunities/{opportunity_id}/contract-files",
    tags=["Opportunities"],
    response_model=List[OpportunityContractFile]
)
async def list_contract_files(opportunity_id: int):
    _get_opportunity(opportunity_id)
    return _fetch_contract_files(opportunity_id)


@router.post(
    "/opportunities/{opportunity_id}/contract-files",
    tags=["Opportunities"],
    response_model=List[OpportunityContractFile]
)
async def upload_contract_files(opportunity_id: int, files: List[UploadFile] = File(...)):
    _get_opportunity(opportunity_id)
    if not files:
        raise HTTPException(status_code=400, detail="Ingen filer at uploade")

    saved = _save_contract_files(opportunity_id, files)
    if not saved:
        raise HTTPException(status_code=500, detail="Kunne ikke gemme filer")
    return saved


@router.get(
    "/opportunities/{opportunity_id}/contract-files/{file_id}",
    tags=["Opportunities"]
)
async def download_contract_file(opportunity_id: int, file_id: int):
    query = """
        SELECT * FROM pipeline_opportunity_contract_files
        WHERE id = %s AND opportunity_id = %s
    """
    result = execute_query(query, (file_id, opportunity_id))
    if not result:
        raise HTTPException(status_code=404, detail="Filen ikke fundet")

    row = result[0]
    stored_name = row.get("stored_name")
    if not stored_name:
        raise HTTPException(status_code=500, detail="Filen mangler lagring")

    path = _resolve_attachment_path(stored_name)
    if not path.exists():
        raise HTTPException(status_code=404, detail="Filen findes ikke på serveren")

    return FileResponse(
        path=path,
        filename=row.get("filename"),
        media_type=row.get("content_type") or "application/octet-stream",
        headers={"Content-Disposition": f"inline; filename=\"{row.get('filename')}\""}
    )