'use client';

import { useState, useEffect } from 'react';
import { format } from 'date-fns';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import { Skeleton } from '@/components/ui/skeleton';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Ticket as TicketType, TicketStatus, Priority } from '@/lib/types/autotask';
import { useApi } from '@/lib/hooks/use-api';
import { ChevronRight, AlertCircle, Clock, CheckCircle, Ticket } from 'lucide-react';

interface TicketListProps {
  resourceId?: number;
  companyId?: number;
}

export function TicketList({ resourceId, companyId }: TicketListProps) {
  const [statusLabels, setStatusLabels] = useState<Record<number, string>>({});
  const [priorityLabels, setPriorityLabels] = useState<Record<number, string>>({});

  let url = '/api/tickets';
  if (resourceId) url += `?resourceId=${resourceId}`;
  else if (companyId) url += `?companyId=${companyId}`;

  const { data, loading, error, refetch } = useApi<{ tickets: TicketType[] }>(url);

  // Fetch picklist values for status and priority
  useEffect(() => {
    fetch('/api/picklists?entity=Tickets&field=status')
      .then(res => res.json())
      .then(data => setStatusLabels(data.picklistValues || {}))
      .catch(console.error);

    fetch('/api/picklists?entity=Tickets&field=priority')
      .then(res => res.json())
      .then(data => setPriorityLabels(data.picklistValues || {}))
      .catch(console.error);
  }, []);

  const getStatusBadge = (status: number) => {
    const label = statusLabels[status] || `Status ${status}`;
    let variant: 'default' | 'secondary' | 'destructive' | 'outline' = 'default';
    let icon = null;

    switch (status) {
      case TicketStatus.New:
        variant = 'destructive';
        icon = <AlertCircle className="w-3 h-3 mr-1" />;
        break;
      case TicketStatus.InProgress:
        variant = 'default';
        icon = <Clock className="w-3 h-3 mr-1" />;
        break;
      case TicketStatus.Complete:
        variant = 'secondary';
        icon = <CheckCircle className="w-3 h-3 mr-1" />;
        break;
      default:
        variant = 'outline';
    }

    return (
      <Badge variant={variant} className="flex items-center">
        {icon}
        {label}
      </Badge>
    );
  };

  const getPriorityBadge = (priority: number) => {
    const label = priorityLabels[priority] || `Priority ${priority}`;
    let variant: 'default' | 'secondary' | 'destructive' | 'outline' = 'default';

    switch (priority) {
      case Priority.Critical:
        variant = 'destructive';
        break;
      case Priority.High:
        variant = 'default';
        break;
      case Priority.Medium:
        variant = 'secondary';
        break;
      case Priority.Low:
        variant = 'outline';
        break;
    }

    return <Badge variant={variant}>{label}</Badge>;
  };

  if (loading) {
    return (
      <Card>
        <CardHeader>
          <CardTitle>Tickets</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="space-y-2">
            {[1, 2, 3].map(i => (
              <Skeleton key={i} className="h-12 w-full" />
            ))}
          </div>
        </CardContent>
      </Card>
    );
  }

  if (error) {
    const isConfigError = error.includes('not configured') || error.includes('configuration');
    
    return (
      <Card>
        <CardHeader>
          <CardTitle>Tickets</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="space-y-4">
            <div className="text-red-500 flex items-center gap-2">
              <AlertCircle className="w-4 h-4" />
              {isConfigError ? 'API Configuration Required' : `Error loading tickets: ${error}`}
            </div>
            {isConfigError && (
              <div className="bg-yellow-50 dark:bg-yellow-900/20 border border-yellow-200 dark:border-yellow-800 rounded-lg p-4">
                <p className="text-sm mb-3">
                  The Autotask API is not configured. Please set up your credentials to start using the dashboard.
                </p>
                <div className="flex gap-2">
                  <Button asChild size="sm">
                    <a href="/setup">Go to Setup</a>
                  </Button>
                  <Button onClick={refetch} variant="outline" size="sm">
                    Retry
                  </Button>
                </div>
              </div>
            )}
            {!isConfigError && (
              <Button onClick={refetch} className="mt-4">
                Retry
              </Button>
            )}
          </div>
        </CardContent>
      </Card>
    );
  }

  const tickets = data?.tickets || [];

  return (
    <Card className="border-0 shadow-lg">
      <CardHeader className="bg-gradient-to-r from-gray-50 to-gray-100 dark:from-gray-900 dark:to-gray-800 rounded-t-lg">
        <div className="flex items-center justify-between">
          <CardTitle className="text-lg flex items-center gap-2">
            <Ticket className="w-5 h-5 text-blue-600" />
            Tickets
            <Badge variant="secondary" className="ml-2">{tickets.length}</Badge>
          </CardTitle>
        </div>
      </CardHeader>
      <CardContent className="pt-6">
        {tickets.length === 0 ? (
          <div className="text-muted-foreground text-center py-8">
            No tickets found
          </div>
        ) : (
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead>Number</TableHead>
                <TableHead>Title</TableHead>
                <TableHead>Status</TableHead>
                <TableHead>Priority</TableHead>
                <TableHead>Created</TableHead>
                <TableHead>Due</TableHead>
                <TableHead></TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {tickets.map((ticket) => (
                <TableRow key={ticket.id}>
                  <TableCell className="font-mono">
                    {ticket.ticketNumber}
                  </TableCell>
                  <TableCell className="max-w-md truncate">
                    {ticket.title}
                  </TableCell>
                  <TableCell>{getStatusBadge(ticket.status)}</TableCell>
                  <TableCell>{getPriorityBadge(ticket.priority)}</TableCell>
                  <TableCell>
                    {format(new Date(ticket.createDate), 'MMM d, yyyy')}
                  </TableCell>
                  <TableCell>
                    {ticket.dueDateTime
                      ? format(new Date(ticket.dueDateTime), 'MMM d, yyyy')
                      : '-'}
                  </TableCell>
                  <TableCell>
                    <Button variant="ghost" size="sm">
                      <ChevronRight className="w-4 h-4" />
                    </Button>
                  </TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        )}
      </CardContent>
    </Card>
  );
}