'use client';

import * as React from 'react';
import Link from 'next/link';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Select } from '@/components/ui/select';
import { Tabs, TabsList, TabsTrigger, TabsContent } from '@/components/ui/tabs';
import { ListingStatusBadge } from '@/components/listings/listing-status-badge';
import {
  listingsApi,
  type ListingDetail,
  type ListingStatus,
  type PaginatedResult,
} from '@/lib/listings-api';
import { PROPERTY_TYPES, TRANSACTION_TYPES, LISTING_STATUSES } from '@/lib/validations/listings';
import { useAuthStore } from '@/lib/auth-store';

function formatPrice(priceVND: string): string {
  const num = Number(priceVND);
  if (num >= 1_000_000_000) return `${(num / 1_000_000_000).toFixed(1)} ty`;
  if (num >= 1_000_000) return `${(num / 1_000_000).toFixed(0)} trieu`;
  return num.toLocaleString('vi-VN');
}

function formatDate(dateStr: string | null): string {
  if (!dateStr) return 'N/A';
  return new Date(dateStr).toLocaleDateString('vi-VN', {
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
  });
}

type ViewMode = 'grid' | 'table';

export default function ListingsPage() {
  const { tokens } = useAuthStore();
  const [result, setResult] = React.useState<PaginatedResult<ListingDetail> | null>(null);
  const [loading, setLoading] = React.useState(true);
  const [viewMode, setViewMode] = React.useState<ViewMode>('grid');
  const [filters, setFilters] = React.useState({
    transactionType: '',
    propertyType: '',
    status: '' as string,
    page: 1,
  });

  const fetchListings = React.useCallback(() => {
    setLoading(true);
    const params: Record<string, string | number> = { page: filters.page, limit: 12 };
    if (filters.transactionType) params['transactionType'] = filters.transactionType;
    if (filters.propertyType) params['propertyType'] = filters.propertyType;
    if (filters.status) params['status'] = filters.status;

    listingsApi
      .search(params)
      .then(setResult)
      .catch(() => setResult(null))
      .finally(() => setLoading(false));
  }, [filters]);

  React.useEffect(() => {
    fetchListings();
  }, [fetchListings]);

  // Stats from current page data
  const stats = React.useMemo(() => {
    if (!result) return { total: 0, active: 0, pending: 0, views: 0 };
    return {
      total: result.total,
      active: result.data.filter((l) => l.status === 'ACTIVE').length,
      pending: result.data.filter((l) => l.status === 'PENDING_REVIEW').length,
      views: result.data.reduce((s, l) => s + l.viewCount, 0),
    };
  }, [result]);

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
        <div>
          <h1 className="text-2xl font-bold">Quan ly tin dang</h1>
          <p className="text-sm text-muted-foreground">
            Quan ly, theo doi va cap nhat cac tin dang cua ban
          </p>
        </div>
        <Link href="/listings/new">
          <Button>Dang tin moi</Button>
        </Link>
      </div>

      {/* Stats */}
      <div className="grid gap-3 sm:grid-cols-4">
        <Card>
          <CardHeader className="pb-2">
            <CardDescription>Tong tin dang</CardDescription>
            <CardTitle className="text-xl">{loading ? '...' : stats.total}</CardTitle>
          </CardHeader>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardDescription>Dang hoat dong</CardDescription>
            <CardTitle className="text-xl text-green-600">
              {loading ? '...' : stats.active}
            </CardTitle>
          </CardHeader>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardDescription>Cho duyet</CardDescription>
            <CardTitle className="text-xl text-yellow-600">
              {loading ? '...' : stats.pending}
            </CardTitle>
          </CardHeader>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardDescription>Tong luot xem</CardDescription>
            <CardTitle className="text-xl">{loading ? '...' : stats.views}</CardTitle>
          </CardHeader>
        </Card>
      </div>

      {/* Filters + View Toggle */}
      <div className="flex flex-wrap items-center gap-3">
        <Select
          value={filters.transactionType}
          onChange={(e) =>
            setFilters((f) => ({ ...f, transactionType: e.target.value, page: 1 }))
          }
          className="w-40"
        >
          <option value="">Tat ca giao dich</option>
          {TRANSACTION_TYPES.map((t) => (
            <option key={t.value} value={t.value}>
              {t.label}
            </option>
          ))}
        </Select>
        <Select
          value={filters.propertyType}
          onChange={(e) =>
            setFilters((f) => ({ ...f, propertyType: e.target.value, page: 1 }))
          }
          className="w-44"
        >
          <option value="">Tat ca loai BDS</option>
          {PROPERTY_TYPES.map((t) => (
            <option key={t.value} value={t.value}>
              {t.label}
            </option>
          ))}
        </Select>
        <Select
          value={filters.status}
          onChange={(e) => setFilters((f) => ({ ...f, status: e.target.value, page: 1 }))}
          className="w-40"
        >
          <option value="">Tat ca trang thai</option>
          {Object.entries(LISTING_STATUSES).map(([key, { label }]) => (
            <option key={key} value={key}>
              {label}
            </option>
          ))}
        </Select>

        <div className="ml-auto flex gap-1">
          <Button
            variant={viewMode === 'grid' ? 'default' : 'outline'}
            size="sm"
            onClick={() => setViewMode('grid')}
          >
            Luoi
          </Button>
          <Button
            variant={viewMode === 'table' ? 'default' : 'outline'}
            size="sm"
            onClick={() => setViewMode('table')}
          >
            Bang
          </Button>
        </div>
      </div>

      {/* Content */}
      {loading ? (
        <div className="flex min-h-[300px] items-center justify-center">
          <div className="h-8 w-8 animate-spin rounded-full border-4 border-primary border-t-transparent" />
        </div>
      ) : !result || result.data.length === 0 ? (
        <div className="flex min-h-[300px] flex-col items-center justify-center text-muted-foreground">
          <p>Chua co tin dang nao</p>
          <Link href="/listings/new" className="mt-2">
            <Button variant="outline" size="sm">
              Dang tin dau tien
            </Button>
          </Link>
        </div>
      ) : viewMode === 'grid' ? (
        /* Grid View */
        <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
          {result.data.map((listing) => (
            <Link key={listing.id} href={`/listings/${listing.id}`}>
              <Card className="h-full overflow-hidden transition-shadow hover:shadow-md">
                <div className="relative aspect-[4/3] bg-muted">
                  {listing.property.media.length > 0 ? (
                    <img
                      src={listing.property.media[0]?.url}
                      alt={listing.property.title}
                      className="h-full w-full object-cover"
                    />
                  ) : (
                    <div className="flex h-full items-center justify-center text-muted-foreground">
                      Chua co anh
                    </div>
                  )}
                  <div className="absolute left-2 top-2">
                    <ListingStatusBadge status={listing.status} />
                  </div>
                </div>
                <CardContent className="p-4">
                  <p className="text-lg font-bold text-primary">
                    {formatPrice(listing.priceVND)} VND
                  </p>
                  <h3 className="mt-1 line-clamp-1 font-medium">{listing.property.title}</h3>
                  <p className="mt-1 line-clamp-1 text-sm text-muted-foreground">
                    {listing.property.district}, {listing.property.city}
                  </p>
                  <div className="mt-3 flex flex-wrap gap-1.5">
                    <Badge variant="secondary" className="text-xs">
                      {listing.property.areaM2} m2
                    </Badge>
                    {listing.property.bedrooms != null && (
                      <Badge variant="secondary" className="text-xs">
                        {listing.property.bedrooms} PN
                      </Badge>
                    )}
                    {listing.property.bathrooms != null && listing.property.bathrooms > 0 && (
                      <Badge variant="secondary" className="text-xs">
                        {listing.property.bathrooms} PT
                      </Badge>
                    )}
                  </div>
                  <div className="mt-3 flex gap-3 text-xs text-muted-foreground">
                    <span>{listing.viewCount} luot xem</span>
                    <span>{listing.inquiryCount} lien he</span>
                    <span>{listing.saveCount} da luu</span>
                  </div>
                </CardContent>
              </Card>
            </Link>
          ))}
        </div>
      ) : (
        /* Table View */
        <Card>
          <CardContent className="p-0">
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <thead>
                  <tr className="border-b text-left">
                    <th className="p-3 font-medium">Tin dang</th>
                    <th className="p-3 font-medium">Loai</th>
                    <th className="p-3 font-medium text-right">Gia</th>
                    <th className="p-3 font-medium text-right">Dien tich</th>
                    <th className="p-3 font-medium text-center">Trang thai</th>
                    <th className="p-3 font-medium text-right">Luot xem</th>
                    <th className="p-3 font-medium text-right">Lien he</th>
                    <th className="p-3 font-medium text-right">Ngay dang</th>
                  </tr>
                </thead>
                <tbody>
                  {result.data.map((listing) => (
                    <tr
                      key={listing.id}
                      className="border-b last:border-0 transition-colors hover:bg-accent/50"
                    >
                      <td className="p-3">
                        <Link
                          href={`/listings/${listing.id}`}
                          className="group flex items-center gap-3"
                        >
                          <div className="h-10 w-14 flex-shrink-0 overflow-hidden rounded bg-muted">
                            {listing.property.media.length > 0 ? (
                              <img
                                src={listing.property.media[0]?.url}
                                alt=""
                                className="h-full w-full object-cover"
                              />
                            ) : (
                              <div className="flex h-full items-center justify-center text-xs text-muted-foreground">
                                N/A
                              </div>
                            )}
                          </div>
                          <div className="min-w-0">
                            <p className="truncate font-medium group-hover:text-primary">
                              {listing.property.title}
                            </p>
                            <p className="truncate text-xs text-muted-foreground">
                              {listing.property.district}, {listing.property.city}
                            </p>
                          </div>
                        </Link>
                      </td>
                      <td className="p-3 text-xs text-muted-foreground">
                        {listing.property.propertyType}
                      </td>
                      <td className="p-3 text-right font-medium text-primary">
                        {formatPrice(listing.priceVND)}
                      </td>
                      <td className="p-3 text-right">{listing.property.areaM2} m2</td>
                      <td className="p-3 text-center">
                        <ListingStatusBadge status={listing.status} />
                      </td>
                      <td className="p-3 text-right">{listing.viewCount}</td>
                      <td className="p-3 text-right">{listing.inquiryCount}</td>
                      <td className="p-3 text-right text-xs text-muted-foreground">
                        {formatDate(listing.publishedAt ?? listing.createdAt)}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </CardContent>
        </Card>
      )}

      {/* Pagination */}
      {result && result.totalPages > 1 && (
        <div className="flex items-center justify-center gap-2">
          <Button
            variant="outline"
            size="sm"
            disabled={filters.page <= 1}
            onClick={() => setFilters((f) => ({ ...f, page: f.page - 1 }))}
          >
            Truoc
          </Button>
          <span className="text-sm text-muted-foreground">
            Trang {result.page} / {result.totalPages}
          </span>
          <Button
            variant="outline"
            size="sm"
            disabled={filters.page >= result.totalPages}
            onClick={() => setFilters((f) => ({ ...f, page: f.page + 1 }))}
          >
            Tiep
          </Button>
        </div>
      )}
    </div>
  );
}