"""
Ticket System Frontend Views
HTML template routes for ticket management UI
"""

import logging
from fastapi import APIRouter, Request, HTTPException, Form
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.templating import Jinja2Templates
from typing import Optional
from datetime import date

from app.core.database import execute_query, execute_update

logger = logging.getLogger(__name__)

router = APIRouter()
templates = Jinja2Templates(directory="app")


# ============================================================================
# MOCKUP ROUTES (TEMPORARY)
# ============================================================================

@router.get("/mockups/1", response_class=HTMLResponse)
async def mockup_option1(request: Request):
    """Mockup: Split Screen Concept"""
    return templates.TemplateResponse("ticket/frontend/mockups/option1_splitscreen.html", {"request": request})

@router.get("/mockups/2", response_class=HTMLResponse)
async def mockup_option2(request: Request):
    """Mockup: Kanban Board Concept"""
    return templates.TemplateResponse("ticket/frontend/mockups/option2_kanban.html", {"request": request})

@router.get("/mockups/3", response_class=HTMLResponse)
async def mockup_option3(request: Request):
    """Mockup: Power Table Concept"""
    return templates.TemplateResponse("ticket/frontend/mockups/option3_powertable.html", {"request": request})


@router.get("/worklog/review", response_class=HTMLResponse)
async def worklog_review_page(
    request: Request,
    customer_id: Optional[int] = None,
    status: str = "draft"
):
    """
    Worklog review page with single-entry approval
    
    Query params:
        customer_id: Filter by customer (optional)
        status: Filter by status (default: draft)
    """
    try:
        # Build query with filters
        query = """
            SELECT 
                w.id,
                w.ticket_id,
                w.user_id,
                w.work_date,
                w.hours,
                w.work_type,
                w.description,
                w.billing_method,
                w.status,
                w.prepaid_card_id,
                w.created_at,
                t.ticket_number,
                t.subject AS ticket_subject,
                t.customer_id,
                t.status AS ticket_status,
                c.name AS customer_name,
                u.username AS user_name,
                pc.card_number,
                pc.remaining_hours AS card_remaining_hours
            FROM tticket_worklog w
            INNER JOIN tticket_tickets t ON t.id = w.ticket_id
            LEFT JOIN customers c ON c.id = t.customer_id
            LEFT JOIN users u ON u.user_id = w.user_id
            LEFT JOIN tticket_prepaid_cards pc ON pc.id = w.prepaid_card_id
            WHERE w.status = %s
        """
        
        params = [status]
        
        if customer_id:
            query += " AND t.customer_id = %s"
            params.append(customer_id)
        
        query += " ORDER BY w.work_date DESC, w.created_at DESC"
        
        worklogs = execute_query(query, tuple(params))
        
        # Get customer list for filter dropdown
        customers_query = """
            SELECT DISTINCT c.id, c.name
            FROM customers c
            INNER JOIN tticket_tickets t ON t.customer_id = c.id
            INNER JOIN tticket_worklog w ON w.ticket_id = t.id
            WHERE w.status = %s
            ORDER BY c.name
        """
        customers = execute_query(customers_query, (status,))
        
        # Calculate totals
        total_hours = sum(float(w['hours']) for w in worklogs)
        total_billable = sum(
            float(w['hours']) 
            for w in worklogs 
            if w['billing_method'] == 'invoice'
        )
        
        return templates.TemplateResponse(
            "ticket/frontend/worklog_review.html",
            {
                "request": request,
                "worklogs": worklogs,
                "customers": customers,
                "selected_customer_id": customer_id,
                "selected_status": status,
                "total_hours": total_hours,
                "total_billable_hours": total_billable,
                "total_entries": len(worklogs)
            }
        )
        
    except Exception as e:
        logger.error(f"❌ Failed to load worklog review page: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/worklog/{worklog_id}/approve")
async def approve_worklog_entry(
    worklog_id: int,
    redirect_to: Optional[str] = Form(default="/ticket/worklog/review")
):
    """
    Approve single worklog entry (change status draft → billable)
    
    Form params:
        redirect_to: URL to redirect after approval
    """
    try:
        # Check entry exists and is draft
        check_query = """
            SELECT id, status, billing_method 
            FROM tticket_worklog 
            WHERE id = %s
        """
        entry = execute_query(check_query, (worklog_id,), fetchone=True)
        
        if not entry:
            raise HTTPException(status_code=404, detail="Worklog entry not found")
        
        if entry['status'] != 'draft':
            raise HTTPException(
                status_code=400, 
                detail=f"Cannot approve entry with status '{entry['status']}'"
            )
        
        # Approve entry
        update_query = """
            UPDATE tticket_worklog 
            SET status = 'billable',
                updated_at = CURRENT_TIMESTAMP
            WHERE id = %s
        """
        execute_update(update_query, (worklog_id,))
        
        logger.info(f"✅ Approved worklog entry {worklog_id}")
        
        return RedirectResponse(url=redirect_to, status_code=303)
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"❌ Failed to approve worklog entry: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/worklog/{worklog_id}/reject")
async def reject_worklog_entry(
    worklog_id: int,
    reason: Optional[str] = Form(default=None),
    redirect_to: Optional[str] = Form(default="/ticket/worklog/review")
):
    """
    Reject single worklog entry (change status draft → rejected)
    
    Form params:
        reason: Rejection reason (optional)
        redirect_to: URL to redirect after rejection
    """
    try:
        # Check entry exists and is draft
        check_query = """
            SELECT id, status 
            FROM tticket_worklog 
            WHERE id = %s
        """
        entry = execute_query(check_query, (worklog_id,), fetchone=True)
        
        if not entry:
            raise HTTPException(status_code=404, detail="Worklog entry not found")
        
        if entry['status'] != 'draft':
            raise HTTPException(
                status_code=400, 
                detail=f"Cannot reject entry with status '{entry['status']}'"
            )
        
        # Reject entry (store reason in description)
        update_query = """
            UPDATE tticket_worklog 
            SET status = 'rejected',
                description = COALESCE(description, '') || 
                    CASE WHEN %s IS NOT NULL 
                    THEN E'\n\n[REJECTED: ' || %s || ']' 
                    ELSE E'\n\n[REJECTED]' 
                    END,
                updated_at = CURRENT_TIMESTAMP
            WHERE id = %s
        """
        execute_update(update_query, (reason, reason, worklog_id))
        
        logger.info(f"❌ Rejected worklog entry {worklog_id}" + (f": {reason}" if reason else ""))
        
        return RedirectResponse(url=redirect_to, status_code=303)
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"❌ Failed to reject worklog entry: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/dashboard", response_class=HTMLResponse)
async def ticket_dashboard(request: Request):
    """
    Ticket system dashboard with statistics
    """
    try:
        # Get ticket statistics
        stats_query = """
            SELECT 
                COUNT(*) FILTER (WHERE status = 'open') AS open_count,
                COUNT(*) FILTER (WHERE status = 'in_progress') AS in_progress_count,
                COUNT(*) FILTER (WHERE status = 'pending_customer') AS pending_count,
                COUNT(*) FILTER (WHERE status = 'resolved') AS resolved_count,
                COUNT(*) FILTER (WHERE status = 'closed') AS closed_count,
                COUNT(*) AS total_count
            FROM tticket_tickets
        """
        stats = execute_query(stats_query, fetchone=True)
        
        # Get recent tickets
        recent_query = """
            SELECT 
                t.id,
                t.ticket_number,
                t.subject,
                t.status,
                t.priority,
                t.created_at,
                c.name AS customer_name
            FROM tticket_tickets t
            LEFT JOIN customers c ON c.id = t.customer_id
            ORDER BY t.created_at DESC
            LIMIT 10
        """
        recent_tickets = execute_query(recent_query)
        
        # Get worklog statistics
        worklog_stats_query = """
            SELECT 
                COUNT(*) FILTER (WHERE status = 'draft') AS draft_count,
                COALESCE(SUM(hours) FILTER (WHERE status = 'draft'), 0) AS draft_hours,
                COUNT(*) FILTER (WHERE status = 'billable') AS billable_count,
                COALESCE(SUM(hours) FILTER (WHERE status = 'billable'), 0) AS billable_hours
            FROM tticket_worklog
        """
        worklog_stats = execute_query(worklog_stats_query, fetchone=True)
        
        return templates.TemplateResponse(
            "ticket/frontend/dashboard.html",
            {
                "request": request,
                "stats": stats,
                "recent_tickets": recent_tickets,
                "worklog_stats": worklog_stats
            }
        )
        
    except Exception as e:
        logger.error(f"❌ Failed to load dashboard: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/tickets", response_class=HTMLResponse)
async def ticket_list_page(
    request: Request,
    status: Optional[str] = None,
    priority: Optional[str] = None,
    customer_id: Optional[int] = None,
    search: Optional[str] = None
):
    """
    Ticket list page with filters
    """
    try:
        # Build query with filters
        query = """
            SELECT 
                t.id,
                t.ticket_number,
                t.subject,
                t.status,
                t.priority,
                t.created_at,
                t.updated_at,
                c.name AS customer_name,
                u.username AS assigned_to_name,
                (SELECT COUNT(*) FROM tticket_comments WHERE ticket_id = t.id) AS comment_count,
                (SELECT COUNT(*) FROM tticket_worklog WHERE ticket_id = t.id) AS worklog_count
            FROM tticket_tickets t
            LEFT JOIN customers c ON c.id = t.customer_id
            LEFT JOIN users u ON u.user_id = t.assigned_to_user_id
            WHERE 1=1
        """
        
        params = []
        
        if status:
            query += " AND t.status = %s"
            params.append(status)
        
        if priority:
            query += " AND t.priority = %s"
            params.append(priority)
        
        if customer_id:
            query += " AND t.customer_id = %s"
            params.append(customer_id)
        
        if search:
            query += " AND (t.subject ILIKE %s OR t.description ILIKE %s OR t.ticket_number ILIKE %s)"
            search_pattern = f"%{search}%"
            params.extend([search_pattern, search_pattern, search_pattern])
        
        query += " ORDER BY t.created_at DESC LIMIT 100"
        
        tickets = execute_query(query, tuple(params)) if params else execute_query(query)
        
        # Get filter options
        customers = execute_query(
            """SELECT DISTINCT c.id, c.name 
               FROM customers c 
               INNER JOIN tticket_tickets t ON t.customer_id = c.id 
               ORDER BY c.name"""
        )
        
        return templates.TemplateResponse(
            "ticket/frontend/ticket_list.html",
            {
                "request": request,
                "tickets": tickets,
                "customers": customers,
                "selected_status": status,
                "selected_priority": priority,
                "selected_customer_id": customer_id,
                "search_query": search
            }
        )
        
    except Exception as e:
        logger.error(f"❌ Failed to load ticket list: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/tickets/{ticket_id}", response_class=HTMLResponse)
async def ticket_detail_page(request: Request, ticket_id: int):
    """
    Ticket detail page with comments and worklog
    """
    try:
        # Get ticket details
        ticket_query = """
            SELECT 
                t.*,
                c.name AS customer_name,
                c.email AS customer_email,
                u.username AS assigned_to_name
            FROM tticket_tickets t
            LEFT JOIN customers c ON c.id = t.customer_id
            LEFT JOIN users u ON u.user_id = t.assigned_to_user_id
            WHERE t.id = %s
        """
        ticket = execute_query(ticket_query, (ticket_id,), fetchone=True)
        
        if not ticket:
            raise HTTPException(status_code=404, detail="Ticket not found")
        
        # Get comments
        comments_query = """
            SELECT 
                c.*,
                u.username AS user_name
            FROM tticket_comments c
            LEFT JOIN users u ON u.user_id = c.user_id
            WHERE c.ticket_id = %s
            ORDER BY c.created_at ASC
        """
        comments = execute_query(comments_query, (ticket_id,))
        
        # Get worklog
        worklog_query = """
            SELECT 
                w.*,
                u.username AS user_name
            FROM tticket_worklog w
            LEFT JOIN users u ON u.user_id = w.user_id
            WHERE w.ticket_id = %s
            ORDER BY w.work_date DESC, w.created_at DESC
        """
        worklog = execute_query(worklog_query, (ticket_id,))
        
        # Get attachments
        attachments_query = """
            SELECT * FROM tticket_attachments
            WHERE ticket_id = %s
            ORDER BY created_at DESC
        """
        attachments = execute_query(attachments_query, (ticket_id,))
        
        return templates.TemplateResponse(
            "ticket/frontend/ticket_detail.html",
            {
                "request": request,
                "ticket": ticket,
                "comments": comments,
                "worklog": worklog,
                "attachments": attachments
            }
        )
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"❌ Failed to load ticket detail: {e}")
        raise HTTPException(status_code=500, detail=str(e))