import { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Select } from '@/components/ui/select';
import { logger } from '@/utils/logger';
import { parseApiError } from '@/utils/apiErrorHandler';
import {
  Music,
  Play,
  Heart,
  Download,
  TrendingUp,
  BarChart3,
  ListMusic,
  Share2,
} from 'lucide-react';
import {
  getAnalyticsData,
  type AnalyticsData,
} from '@/features/analytics/services/analyticsService';
import { LoadingSpinner } from '@/components/ui/loading-spinner';

/**
 * FE-PAGE-015: Analytics page for track and playlist statistics
 */
export function AnalyticsPage() {
  const [analytics, setAnalytics] = useState<AnalyticsData | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [period, setPeriod] = useState<number>(30);
  const navigate = useNavigate();

  useEffect(() => {
    loadAnalytics();
  }, [period]);

  const loadAnalytics = async () => {
    setLoading(true);
    setError(null);

    try {
      const data = await getAnalyticsData(period);
      setAnalytics(data);
    } catch (err: unknown) {
      const apiError = parseApiError(err);
      logger.error('Failed to load analytics', {
        error: apiError.message,
        period,
      });
      setError(apiError.message);
    } finally {
      setLoading(false);
    }
  };

  const formatNumber = (num: number): string => {
    if (num >= 1000000) {
      return `${(num / 1000000).toFixed(1)}M`;
    }
    if (num >= 1000) {
      return `${(num / 1000).toFixed(1)}K`;
    }
    return num.toString();
  };

  if (loading) {
    return (
      <div className="container mx-auto px-4 py-8">
        <div className="flex items-center justify-center h-[400px]">
          <LoadingSpinner />
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="container mx-auto px-4 py-8">
        <Card>
          <CardHeader>
            <CardTitle>Erreur</CardTitle>
            <CardDescription>{error}</CardDescription>
          </CardHeader>
          <CardContent>
            <Button onClick={loadAnalytics}>Réessayer</Button>
          </CardContent>
        </Card>
      </div>
    );
  }

  if (!analytics) {
    return null;
  }

  return (
    <div className="container mx-auto px-4 py-8">
      <div className="mb-6">
        <h1 className="text-3xl font-bold mb-2">Analytics</h1>
        <p className="text-muted-foreground">
          Statistiques et métriques de performance pour vos pistes et playlists
        </p>
      </div>

      {/* Period selector */}
      <div className="mb-6 flex items-center gap-4">
        <label htmlFor="period" className="text-sm font-medium">
          Période:
        </label>
        <Select
          options={[
            { value: '7', label: '7 derniers jours' },
            { value: '30', label: '30 derniers jours' },
            { value: '90', label: '90 derniers jours' },
            { value: '365', label: '1 an' },
          ]}
          value={period.toString()}
          onChange={(value) => setPeriod(parseInt(value as string, 10))}
          placeholder="Sélectionner une période"
          className="w-[180px]"
        />
      </div>

      {/* Track Analytics */}
      <div className="mb-8">
        <h2 className="text-2xl font-semibold mb-4 flex items-center gap-2">
          <Music className="h-6 w-6" />
          Statistiques des pistes
        </h2>
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4 mb-6">
          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des pistes
              </CardTitle>
              <Music className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.tracks.total_tracks)}
              </div>
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des lectures
              </CardTitle>
              <Play className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.tracks.total_plays)}
              </div>
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des likes
              </CardTitle>
              <Heart className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.tracks.total_likes)}
              </div>
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des téléchargements
              </CardTitle>
              <Download className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.tracks.total_downloads)}
              </div>
            </CardContent>
          </Card>
        </div>

        {/* Top Tracks */}
        {analytics.tracks.top_tracks.length > 0 && (
          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <TrendingUp className="h-5 w-5" />
                Top 5 pistes
              </CardTitle>
              <CardDescription>Vos pistes les plus écoutées</CardDescription>
            </CardHeader>
            <CardContent>
              <div className="space-y-4">
                {analytics.tracks.top_tracks.map((track, index) => (
                  <div
                    key={track.id}
                    className="flex items-center justify-between p-3 border rounded-lg hover:bg-accent cursor-pointer"
                    onClick={() => navigate(`/tracks/${track.id}`)}
                  >
                    <div className="flex items-center gap-4">
                      <div className="flex items-center justify-center w-8 h-8 rounded-full bg-primary/10 text-primary font-semibold">
                        {index + 1}
                      </div>
                      <div>
                        <p className="font-medium">{track.title}</p>
                        <div className="flex items-center gap-4 text-sm text-muted-foreground">
                          <span className="flex items-center gap-1">
                            <Play className="h-3 w-3" />
                            {formatNumber(track.play_count)}
                          </span>
                          <span className="flex items-center gap-1">
                            <Heart className="h-3 w-3" />
                            {formatNumber(track.like_count)}
                          </span>
                        </div>
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            </CardContent>
          </Card>
        )}
      </div>

      {/* Playlist Analytics */}
      <div className="mb-8">
        <h2 className="text-2xl font-semibold mb-4 flex items-center gap-2">
          <ListMusic className="h-6 w-6" />
          Statistiques des playlists
        </h2>
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4 mb-6">
          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des playlists
              </CardTitle>
              <ListMusic className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.playlists.total_playlists)}
              </div>
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des lectures
              </CardTitle>
              <Play className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.playlists.total_plays)}
              </div>
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des likes
              </CardTitle>
              <Heart className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.playlists.total_likes)}
              </div>
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium">
                Total des partages
              </CardTitle>
              <Share2 className="h-4 w-4 text-muted-foreground" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold">
                {formatNumber(analytics.playlists.total_shares)}
              </div>
            </CardContent>
          </Card>
        </div>

        {/* Top Playlists */}
        {analytics.playlists.top_playlists.length > 0 && (
          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <TrendingUp className="h-5 w-5" />
                Top 5 playlists
              </CardTitle>
              <CardDescription>Vos playlists les plus écoutées</CardDescription>
            </CardHeader>
            <CardContent>
              <div className="space-y-4">
                {analytics.playlists.top_playlists.map((playlist, index) => (
                  <div
                    key={playlist.id}
                    className="flex items-center justify-between p-3 border rounded-lg hover:bg-accent cursor-pointer"
                    onClick={() => navigate(`/playlists/${playlist.id}`)}
                  >
                    <div className="flex items-center gap-4">
                      <div className="flex items-center justify-center w-8 h-8 rounded-full bg-primary/10 text-primary font-semibold">
                        {index + 1}
                      </div>
                      <div>
                        <p className="font-medium">{playlist.name}</p>
                        <div className="flex items-center gap-4 text-sm text-muted-foreground">
                          <span className="flex items-center gap-1">
                            <Play className="h-3 w-3" />
                            {formatNumber(playlist.play_count)}
                          </span>
                          <span className="flex items-center gap-1">
                            <Heart className="h-3 w-3" />
                            {formatNumber(playlist.like_count)}
                          </span>
                        </div>
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            </CardContent>
          </Card>
        )}
      </div>

      {/* Summary Card */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <BarChart3 className="h-5 w-5" />
            Résumé
          </CardTitle>
          <CardDescription>Vue d'ensemble de vos performances</CardDescription>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div>
              <p className="text-sm text-muted-foreground mb-1">
                Lectures moyennes par piste
              </p>
              <p className="text-2xl font-bold">
                {Math.round(analytics.tracks.average_play_count)}
              </p>
            </div>
            <div>
              <p className="text-sm text-muted-foreground mb-1">
                Lectures moyennes par playlist
              </p>
              <p className="text-2xl font-bold">
                {Math.round(analytics.playlists.average_play_count)}
              </p>
            </div>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}
