import logging
from fastapi import APIRouter, HTTPException, Query
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates
from pathlib import Path
from app.core.database import execute_query

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

# Setup template directory
template_dir = Path(__file__).parent.parent / "templates"
templates = Jinja2Templates(directory=str(template_dir))

@router.get("/sag", response_class=HTMLResponse)
async def sager_liste(
    request,
    status: str = Query(None),
    tag: str = Query(None),
    customer_id: int = Query(None),
):
    """Display list of all cases."""
    try:
        query = "SELECT * FROM sag_sager WHERE deleted_at IS NULL"
        params = []
        
        if status:
            query += " AND status = %s"
            params.append(status)
        if customer_id:
            query += " AND customer_id = %s"
            params.append(customer_id)
        
        query += " ORDER BY created_at DESC"
        sager = execute_query(query, tuple(params))
        
        # Filter by tag if provided
        if tag and sager:
            sag_ids = [s['id'] for s in sager]
            tag_query = "SELECT sag_id FROM sag_tags WHERE tag_navn = %s AND deleted_at IS NULL"
            tagged = execute_query(tag_query, (tag,))
            tagged_ids = set(t['sag_id'] for t in tagged)
            sager = [s for s in sager if s['id'] in tagged_ids]
        
        # Fetch all distinct statuses and tags for filters
        statuses = execute_query("SELECT DISTINCT status FROM sag_sager WHERE deleted_at IS NULL ORDER BY status", ())
        all_tags = execute_query("SELECT DISTINCT tag_navn FROM sag_tags WHERE deleted_at IS NULL ORDER BY tag_navn", ())
        
        return templates.TemplateResponse("index.html", {
            "request": request,
            "sager": sager,
            "statuses": [s['status'] for s in statuses],
            "all_tags": [t['tag_navn'] for t in all_tags],
            "current_status": status,
            "current_tag": tag,
        })
    except Exception as e:
        logger.error("❌ Error displaying case list: %s", e)
        raise HTTPException(status_code=500, detail="Failed to load case list")

@router.get("/sag/{sag_id}", response_class=HTMLResponse)
async def sag_detaljer(request, sag_id: int):
    """Display case details."""
    try:
        # Fetch main case
        sag_query = "SELECT * FROM sag_sager WHERE id = %s AND deleted_at IS NULL"
        sag_result = execute_query(sag_query, (sag_id,))
        
        if not sag_result:
            raise HTTPException(status_code=404, detail="Case not found")
        
        sag = sag_result[0]
        
        # Fetch tags
        tags_query = "SELECT * FROM sag_tags WHERE sag_id = %s AND deleted_at IS NULL ORDER BY created_at DESC"
        tags = execute_query(tags_query, (sag_id,))
        
        # Fetch relations
        relationer_query = """
            SELECT sr.*, 
                   ss_kilde.titel as kilde_titel,
                   ss_mål.titel as mål_titel
            FROM sag_relationer sr
            JOIN sag_sager ss_kilde ON sr.kilde_sag_id = ss_kilde.id
            JOIN sag_sager ss_mål ON sr.målsag_id = ss_mål.id
            WHERE (sr.kilde_sag_id = %s OR sr.målsag_id = %s)
            AND sr.deleted_at IS NULL
            ORDER BY sr.created_at DESC
        """
        relationer = execute_query(relationer_query, (sag_id, sag_id))
        
        # Fetch customer info if customer_id exists
        customer = None
        if sag.get('customer_id'):
            customer_query = "SELECT * FROM customers WHERE id = %s"
            customer_result = execute_query(customer_query, (sag['customer_id'],))
            if customer_result:
                customer = customer_result[0]
        
        return templates.TemplateResponse("detail.html", {
            "request": request,
            "sag": sag,
            "customer": customer,
            "tags": tags,
            "relationer": relationer,
        })
    except HTTPException:
        raise
    except Exception as e:
        logger.error("❌ Error displaying case details: %s", e)
        raise HTTPException(status_code=500, detail="Failed to load case details")