/**
 * Monitor 7: Monitoring Dashboard Component
 * Visualizes validation metrics, API performance, and error tracking
 */

import { useState, useEffect } from 'react';
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import {
  Activity,
  AlertTriangle,
  CheckCircle,
  XCircle,
  TrendingUp,
  Clock,
  ExternalLink,
  RefreshCw,
} from 'lucide-react';
import { validationMetrics } from '@/services/api/client';
import { env } from '@/config/env';
import { logger } from '@/utils/logger';

interface MonitoringMetrics {
  validation: {
    total: number;
    successful: number;
    failed: number;
    failureRate: number;
    lastFailureTime?: string;
    lastSuccessTime?: string;
    failuresByEndpoint: Record<string, number>;
  };
  sentry: {
    enabled: boolean;
    dsnConfigured: boolean;
  };
}

export function MonitoringDashboard() {
  const [metrics, setMetrics] = useState<MonitoringMetrics | null>(null);
  const [lastUpdate, setLastUpdate] = useState<Date>(new Date());

  const loadMetrics = () => {
    try {
      const validationMetricsData = validationMetrics.getMetrics();

      setMetrics({
        validation: {
          total: validationMetricsData.totalValidations,
          successful: validationMetricsData.successfulValidations,
          failed: validationMetricsData.failedValidations,
          failureRate: validationMetricsData.failureRate,
          lastFailureTime: validationMetricsData.lastFailureTime,
          lastSuccessTime: validationMetricsData.lastSuccessTime,
          failuresByEndpoint: validationMetricsData.failuresByEndpoint,
        },
        sentry: {
          enabled: !!env.SENTRY_DSN && import.meta.env.PROD,
          dsnConfigured: !!env.SENTRY_DSN,
        },
      });
      setLastUpdate(new Date());
    } catch (error) {
      logger.error('[MonitoringDashboard] Failed to load metrics', {
        error: error instanceof Error ? error.message : String(error),
      });
    }
  };

  useEffect(() => {
    loadMetrics();
    // Refresh metrics every 30 seconds
    const interval = setInterval(loadMetrics, 30000);
    return () => clearInterval(interval);
  }, []);

  if (!metrics) {
    return (
      <div className="flex items-center justify-center h-[400px]">
        <div className="text-center">
          <RefreshCw className="h-8 w-8 animate-spin mx-auto mb-4 text-muted-foreground" />
          <p className="text-muted-foreground">Chargement des métriques...</p>
        </div>
      </div>
    );
  }

  const getFailureRateColor = (rate: number): string => {
    if (rate === 0) return 'text-green-600';
    if (rate < 1) return 'text-yellow-600';
    if (rate < 5) return 'text-orange-600';
    return 'text-red-600';
  };

  const getFailureRateBadge = (rate: number) => {
    if (rate === 0) return 'success';
    if (rate < 1) return 'default';
    if (rate < 5) return 'warning';
    return 'error';
  };

  const topFailureEndpoints = Object.entries(metrics.validation.failuresByEndpoint)
    .sort(([, a], [, b]) => b - a)
    .slice(0, 5);

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h2 className="text-2xl font-bold flex items-center gap-2">
            <Activity className="h-6 w-6" />
            Monitoring du Système
          </h2>
          <p className="text-muted-foreground text-sm mt-1">
            Métriques de validation, performance API et suivi des erreurs
          </p>
        </div>
        <div className="flex items-center gap-2">
          <p className="text-xs text-muted-foreground">
            Dernière mise à jour: {lastUpdate.toLocaleTimeString('fr-FR')}
          </p>
          <Button
            variant="outline"
            size="sm"
            onClick={loadMetrics}
            className="gap-2"
          >
            <RefreshCw className="h-4 w-4" />
            Actualiser
          </Button>
        </div>
      </div>

      {/* Validation Metrics */}
      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
        <Card>
          <CardHeader className="pb-3">
            <CardTitle className="text-sm font-medium flex items-center gap-2">
              <Activity className="h-4 w-4" />
              Total Validations
            </CardTitle>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold">
              {metrics.validation.total.toLocaleString()}
            </div>
            <p className="text-xs text-muted-foreground mt-1">
              Validations depuis le démarrage
            </p>
          </CardContent>
        </Card>

        <Card>
          <CardHeader className="pb-3">
            <CardTitle className="text-sm font-medium flex items-center gap-2">
              <CheckCircle className="h-4 w-4 text-green-600" />
              Validations Réussies
            </CardTitle>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-green-600">
              {metrics.validation.successful.toLocaleString()}
            </div>
            <p className="text-xs text-muted-foreground mt-1">
              {metrics.validation.total > 0
                ? (
                    (metrics.validation.successful / metrics.validation.total) *
                    100
                  ).toFixed(1)
                : 0}
              % de réussite
            </p>
          </CardContent>
        </Card>

        <Card>
          <CardHeader className="pb-3">
            <CardTitle className="text-sm font-medium flex items-center gap-2">
              <XCircle className="h-4 w-4 text-red-600" />
              Validations Échouées
            </CardTitle>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-red-600">
              {metrics.validation.failed.toLocaleString()}
            </div>
            <p className="text-xs text-muted-foreground mt-1">
              {metrics.validation.failureRate.toFixed(2)}% d'échec
            </p>
          </CardContent>
        </Card>

        <Card>
          <CardHeader className="pb-3">
            <CardTitle className="text-sm font-medium flex items-center gap-2">
              <TrendingUp className="h-4 w-4" />
              Taux d'Échec
            </CardTitle>
          </CardHeader>
          <CardContent>
            <div
              className={`text-2xl font-bold ${getFailureRateColor(
                metrics.validation.failureRate,
              )}`}
            >
              {metrics.validation.failureRate.toFixed(2)}%
            </div>
            <Badge
              variant={getFailureRateBadge(metrics.validation.failureRate)}
              className="mt-2"
            >
              {metrics.validation.failureRate === 0
                ? 'Parfait'
                : metrics.validation.failureRate < 1
                  ? 'Bon'
                  : metrics.validation.failureRate < 5
                    ? 'Attention'
                    : 'Critique'}
            </Badge>
          </CardContent>
        </Card>
      </div>

      {/* Detailed Metrics */}
      <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
        {/* Validation Details */}
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <Activity className="h-5 w-5" />
              Détails des Validations
            </CardTitle>
            <CardDescription>
              Statistiques détaillées des validations API
            </CardDescription>
          </CardHeader>
          <CardContent className="space-y-4">
            <div className="space-y-2">
              <div className="flex justify-between items-center">
                <span className="text-sm text-muted-foreground">
                  Dernière validation réussie:
                </span>
                <span className="text-sm font-medium">
                  {metrics.validation.lastSuccessTime
                    ? new Date(
                        metrics.validation.lastSuccessTime,
                      ).toLocaleString('fr-FR')
                    : 'Aucune'}
                </span>
              </div>
              <div className="flex justify-between items-center">
                <span className="text-sm text-muted-foreground">
                  Dernière validation échouée:
                </span>
                <span className="text-sm font-medium text-red-600">
                  {metrics.validation.lastFailureTime
                    ? new Date(
                        metrics.validation.lastFailureTime,
                      ).toLocaleString('fr-FR')
                    : 'Aucune'}
                </span>
              </div>
            </div>

            {topFailureEndpoints.length > 0 && (
              <div className="mt-4">
                <h4 className="text-sm font-medium mb-2">
                  Endpoints avec le plus d'échecs:
                </h4>
                <div className="space-y-1">
                  {topFailureEndpoints.map(([endpoint, count]) => (
                    <div
                      key={endpoint}
                      className="flex justify-between items-center p-2 bg-muted rounded text-sm"
                    >
                      <code className="text-xs">{endpoint}</code>
                      <Badge variant="error">{count}</Badge>
                    </div>
                  ))}
                </div>
              </div>
            )}
          </CardContent>
        </Card>

        {/* Error Tracking Status */}
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <AlertTriangle className="h-5 w-5" />
              Suivi des Erreurs
            </CardTitle>
            <CardDescription>
              Configuration et statut du suivi des erreurs
            </CardDescription>
          </CardHeader>
          <CardContent className="space-y-4">
            <div className="space-y-3">
              <div className="flex items-center justify-between p-3 bg-muted rounded">
                <div className="flex items-center gap-2">
                  {metrics.sentry.enabled ? (
                    <CheckCircle className="h-5 w-5 text-green-600" />
                  ) : (
                    <XCircle className="h-5 w-5 text-muted-foreground" />
                  )}
                  <span className="text-sm font-medium">Sentry Error Tracking</span>
                </div>
                <Badge
                  variant={metrics.sentry.enabled ? 'success' : 'secondary'}
                >
                  {metrics.sentry.enabled ? 'Actif' : 'Inactif'}
                </Badge>
              </div>

              <div className="flex items-center justify-between p-3 bg-muted rounded">
                <div className="flex items-center gap-2">
                  {metrics.sentry.dsnConfigured ? (
                    <CheckCircle className="h-5 w-5 text-green-600" />
                  ) : (
                    <XCircle className="h-5 w-5 text-muted-foreground" />
                  )}
                  <span className="text-sm font-medium">DSN Configuré</span>
                </div>
                <Badge
                  variant={metrics.sentry.dsnConfigured ? 'success' : 'secondary'}
                >
                  {metrics.sentry.dsnConfigured ? 'Oui' : 'Non'}
                </Badge>
              </div>
            </div>

            {metrics.sentry.enabled && (
              <div className="mt-4 p-3 bg-blue-50 dark:bg-blue-950 rounded border border-blue-200 dark:border-blue-800">
                <p className="text-xs text-blue-900 dark:text-blue-100 mb-2">
                  Les erreurs sont automatiquement envoyées à Sentry pour le suivi
                  et l'analyse.
                </p>
                <Button
                  variant="outline"
                  size="sm"
                  className="w-full gap-2"
                  onClick={() => {
                    // Open Sentry dashboard (if URL is known)
                    // This would typically be configured in env vars
                    const sentryDsn = env.SENTRY_DSN;
                    const sentryUrl = sentryDsn
                      ? `https://sentry.io/organizations/${sentryDsn.split('@')[1]?.split('/')[0]}/issues/`
                      : 'https://sentry.io';
                    window.open(sentryUrl, '_blank');
                  }}
                >
                  <ExternalLink className="h-4 w-4" />
                  Ouvrir Sentry Dashboard
                </Button>
              </div>
            )}

            {!metrics.sentry.enabled && (
              <div className="mt-4 p-3 bg-yellow-50 dark:bg-yellow-950 rounded border border-yellow-200 dark:border-yellow-800">
                <p className="text-xs text-yellow-900 dark:text-yellow-100">
                  Le suivi des erreurs Sentry n'est pas activé. Configurez{' '}
                  <code className="bg-yellow-100 dark:bg-yellow-900 px-1 rounded">
                    VITE_SENTRY_DSN
                  </code>{' '}
                  pour activer le suivi des erreurs en production.
                </p>
              </div>
            )}
          </CardContent>
        </Card>
      </div>

      {/* Performance Monitoring Info */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Clock className="h-5 w-5" />
            Performance Monitoring
          </CardTitle>
          <CardDescription>
            Les métriques de performance sont suivies automatiquement
          </CardDescription>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
            <div className="p-3 bg-muted rounded">
              <div className="text-sm font-medium mb-1">
                Temps de Rendu
              </div>
              <p className="text-xs text-muted-foreground">
                Suivi via Sentry Browser Tracing
              </p>
            </div>
            <div className="p-3 bg-muted rounded">
              <div className="text-sm font-medium mb-1">
                Temps de Réponse API
              </div>
              <p className="text-xs text-muted-foreground">
                Suivi dans le client API avec détection des requêtes lentes
              </p>
            </div>
            <div className="p-3 bg-muted rounded">
              <div className="text-sm font-medium mb-1">
                Erreurs Réseau
              </div>
              <p className="text-xs text-muted-foreground">
                Détection des pannes partielles vs complètes
              </p>
            </div>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}