'use client';

import { useEffect, useState } from 'react';
import { useParams, useRouter } from 'next/navigation';
import { createClient } from '@/lib/supabase/client';
import { Broadcast, BroadcastRecipient } from '@/types';
import { Button } from '@/components/ui/button';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import {
  ArrowLeft,
  Loader2,
  Users,
  Send,
  CheckCheck,
  Eye,
  AlertCircle,
} from 'lucide-react';

const statusConfig: Record<string, { label: string; classes: string }> = {
  draft: { label: 'Draft', classes: 'bg-slate-500/10 text-slate-400 border-slate-500/20' },
  scheduled: { label: 'Scheduled', classes: 'bg-blue-500/10 text-blue-400 border-blue-500/20' },
  sending: { label: 'Sending', classes: 'bg-yellow-500/10 text-yellow-400 border-yellow-500/20' },
  sent: { label: 'Sent', classes: 'bg-emerald-500/10 text-emerald-400 border-emerald-500/20' },
  failed: { label: 'Failed', classes: 'bg-red-500/10 text-red-400 border-red-500/20' },
};

const recipientStatusConfig: Record<string, { label: string; classes: string }> = {
  pending: { label: 'Pending', classes: 'bg-slate-500/10 text-slate-400 border-slate-500/20' },
  sent: { label: 'Sent', classes: 'bg-blue-500/10 text-blue-400 border-blue-500/20' },
  delivered: { label: 'Delivered', classes: 'bg-emerald-500/10 text-emerald-400 border-emerald-500/20' },
  read: { label: 'Read', classes: 'bg-emerald-500/10 text-emerald-300 border-emerald-500/20' },
  replied: { label: 'Replied', classes: 'bg-purple-500/10 text-purple-400 border-purple-500/20' },
  failed: { label: 'Failed', classes: 'bg-red-500/10 text-red-400 border-red-500/20' },
};

interface StatCardProps {
  label: string;
  value: number;
  total: number;
  icon: React.ReactNode;
  color: string;
}

function StatCard({ label, value, total, icon, color }: StatCardProps) {
  const pct = total > 0 ? Math.round((value / total) * 100) : 0;
  return (
    <div className="rounded-xl border border-slate-800 bg-slate-900 p-4">
      <div className="flex items-center justify-between">
        <div className={`flex h-8 w-8 items-center justify-center rounded-lg ${color}`}>
          {icon}
        </div>
        <span className="text-xs text-slate-500">{pct}%</span>
      </div>
      <p className="mt-3 text-2xl font-bold text-white">{value.toLocaleString()}</p>
      <p className="text-xs text-slate-400">{label}</p>
    </div>
  );
}

export default function BroadcastDetailPage() {
  const params = useParams();
  const router = useRouter();
  const broadcastId = params.id as string;

  const [broadcast, setBroadcast] = useState<Broadcast | null>(null);
  const [recipients, setRecipients] = useState<BroadcastRecipient[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    async function fetchData() {
      try {
        const supabase = createClient();

        const { data: bc, error: bcError } = await supabase
          .from('broadcasts')
          .select('*')
          .eq('id', broadcastId)
          .single();

        if (bcError) throw bcError;
        setBroadcast(bc);

        const { data: recs, error: recsError } = await supabase
          .from('broadcast_recipients')
          .select('*, contact:contacts(*)')
          .eq('broadcast_id', broadcastId)
          .order('created_at', { ascending: false });

        if (recsError) throw recsError;
        setRecipients(recs ?? []);
      } catch (err) {
        setError(err instanceof Error ? err.message : 'Failed to load broadcast');
      } finally {
        setLoading(false);
      }
    }

    fetchData();
  }, [broadcastId]);

  if (loading) {
    return (
      <div className="flex h-64 items-center justify-center">
        <Loader2 className="h-6 w-6 animate-spin text-emerald-500" />
      </div>
    );
  }

  if (error || !broadcast) {
    return (
      <div className="flex h-64 flex-col items-center justify-center gap-2">
        <p className="text-sm text-red-400">{error ?? 'Broadcast not found'}</p>
        <Button variant="outline" onClick={() => router.push('/broadcasts')}>
          Back to Broadcasts
        </Button>
      </div>
    );
  }

  const status = statusConfig[broadcast.status] ?? statusConfig.draft;

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-start justify-between">
        <div className="flex items-center gap-4">
          <Button
            variant="outline"
            size="icon"
            onClick={() => router.push('/broadcasts')}
            className="border-slate-700"
          >
            <ArrowLeft className="h-4 w-4" />
          </Button>
          <div>
            <div className="flex items-center gap-3">
              <h1 className="text-2xl font-bold text-white">{broadcast.name}</h1>
              <span
                className={`inline-flex items-center rounded-full border px-2 py-0.5 text-xs font-medium ${status.classes}`}
              >
                {status.label}
              </span>
            </div>
            <div className="mt-1 flex items-center gap-3 text-sm text-slate-400">
              <span>Template: {broadcast.template_name}</span>
              <span>-</span>
              <span>Created {new Date(broadcast.created_at).toLocaleDateString()}</span>
            </div>
          </div>
        </div>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-2 gap-3 sm:grid-cols-3 lg:grid-cols-5">
        <StatCard
          label="Total Recipients"
          value={broadcast.total_recipients}
          total={broadcast.total_recipients}
          icon={<Users className="h-4 w-4" />}
          color="bg-slate-800 text-slate-300"
        />
        <StatCard
          label="Sent"
          value={broadcast.sent_count}
          total={broadcast.total_recipients}
          icon={<Send className="h-4 w-4" />}
          color="bg-blue-500/10 text-blue-400"
        />
        <StatCard
          label="Delivered"
          value={broadcast.delivered_count}
          total={broadcast.total_recipients}
          icon={<CheckCheck className="h-4 w-4" />}
          color="bg-emerald-500/10 text-emerald-400"
        />
        <StatCard
          label="Read"
          value={broadcast.read_count}
          total={broadcast.total_recipients}
          icon={<Eye className="h-4 w-4" />}
          color="bg-emerald-500/10 text-emerald-300"
        />
        <StatCard
          label="Failed"
          value={broadcast.failed_count}
          total={broadcast.total_recipients}
          icon={<AlertCircle className="h-4 w-4" />}
          color="bg-red-500/10 text-red-400"
        />
      </div>

      {/* Recipients Table */}
      <div className="rounded-xl border border-slate-800 bg-slate-900">
        <div className="border-b border-slate-800 px-4 py-3">
          <h2 className="text-sm font-medium text-white">
            Recipients ({recipients.length})
          </h2>
        </div>
        {recipients.length === 0 ? (
          <div className="flex h-32 items-center justify-center">
            <p className="text-sm text-slate-400">No recipients found.</p>
          </div>
        ) : (
          <Table>
            <TableHeader>
              <TableRow className="border-slate-800 hover:bg-transparent">
                <TableHead className="text-slate-400">Contact</TableHead>
                <TableHead className="text-slate-400">Phone</TableHead>
                <TableHead className="text-slate-400">Status</TableHead>
                <TableHead className="text-slate-400">Sent At</TableHead>
                <TableHead className="text-slate-400">Error</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {recipients.map((recipient) => {
                const rStatus =
                  recipientStatusConfig[recipient.status] ?? recipientStatusConfig.pending;

                return (
                  <TableRow key={recipient.id} className="border-slate-800">
                    <TableCell className="font-medium text-white">
                      {recipient.contact?.name ?? 'Unknown'}
                    </TableCell>
                    <TableCell className="text-slate-300">
                      {recipient.contact?.phone ?? '-'}
                    </TableCell>
                    <TableCell>
                      <span
                        className={`inline-flex items-center rounded-full border px-2 py-0.5 text-xs font-medium ${rStatus.classes}`}
                      >
                        {rStatus.label}
                      </span>
                    </TableCell>
                    <TableCell className="text-slate-400">
                      {recipient.sent_at
                        ? new Date(recipient.sent_at).toLocaleString()
                        : '-'}
                    </TableCell>
                    <TableCell className="max-w-xs truncate text-xs text-red-400">
                      {recipient.error_message ?? '-'}
                    </TableCell>
                  </TableRow>
                );
              })}
            </TableBody>
          </Table>
        )}
      </div>
    </div>
  );
}