/**
 * CourseProgressTracker Component
 * Comprehensive progress visualization at the course level
 * OQI-002: Modulo Educativo
 */

import React, { useMemo } from 'react';
import {
  BookOpen,
  CheckCircle,
  Circle,
  Clock,
  Play,
  Lock,
  Trophy,
  Target,
  TrendingUp,
  Download,
  ChevronRight,
  Zap,
  Calendar,
} from 'lucide-react';

export interface ModuleProgress {
  id: string;
  title: string;
  lessonsTotal: number;
  lessonsCompleted: number;
  quizScore?: number;
  quizPassed?: boolean;
  timeSpentMinutes: number;
  estimatedMinutes: number;
  status: 'locked' | 'available' | 'in_progress' | 'completed';
  order: number;
}

export interface CourseProgressData {
  courseId: string;
  courseTitle: string;
  totalLessons: number;
  completedLessons: number;
  totalQuizzes: number;
  passedQuizzes: number;
  overallProgress: number;
  xpEarned: number;
  xpTotal: number;
  timeSpentMinutes: number;
  estimatedTotalMinutes: number;
  startedAt?: string;
  lastAccessedAt?: string;
  modules: ModuleProgress[];
}

interface CourseProgressTrackerProps {
  progress: CourseProgressData;
  onModuleClick?: (moduleId: string) => void;
  onDownloadReport?: () => void;
  compact?: boolean;
}

const CourseProgressTracker: React.FC<CourseProgressTrackerProps> = ({
  progress,
  onModuleClick,
  onDownloadReport,
  compact = false,
}) => {
  const sortedModules = useMemo(() => {
    return [...progress.modules].sort((a, b) => a.order - b.order);
  }, [progress.modules]);

  const completedModules = progress.modules.filter(m => m.status === 'completed').length;
  const totalModules = progress.modules.length;

  const formatTime = (minutes: number) => {
    if (minutes < 60) return `${minutes}m`;
    const hours = Math.floor(minutes / 60);
    const mins = minutes % 60;
    return mins > 0 ? `${hours}h ${mins}m` : `${hours}h`;
  };

  const formatDate = (dateString: string) => {
    return new Date(dateString).toLocaleDateString('es-ES', {
      day: 'numeric',
      month: 'short',
      year: 'numeric',
    });
  };

  const getStatusIcon = (status: ModuleProgress['status']) => {
    switch (status) {
      case 'completed':
        return <CheckCircle className="w-5 h-5 text-green-400" />;
      case 'in_progress':
        return <Play className="w-5 h-5 text-blue-400" />;
      case 'locked':
        return <Lock className="w-5 h-5 text-gray-500" />;
      default:
        return <Circle className="w-5 h-5 text-gray-400" />;
    }
  };

  const getStatusBg = (status: ModuleProgress['status']) => {
    switch (status) {
      case 'completed':
        return 'bg-green-500/10 border-green-500/30';
      case 'in_progress':
        return 'bg-blue-500/10 border-blue-500/30';
      case 'locked':
        return 'bg-gray-800/50 border-gray-700 opacity-60';
      default:
        return 'bg-gray-800/50 border-gray-700';
    }
  };

  const estimatedCompletion = useMemo(() => {
    const remainingMinutes = progress.estimatedTotalMinutes - progress.timeSpentMinutes;
    if (remainingMinutes <= 0) return 'Completable ahora';
    const days = Math.ceil(remainingMinutes / 60 / 2); // Assuming 2 hours/day
    return `~${days} ${days === 1 ? 'dia' : 'dias'} restantes`;
  }, [progress]);

  return (
    <div className={`bg-gray-800/50 rounded-xl border border-gray-700 ${compact ? 'p-3' : 'p-4'}`}>
      {/* Header */}
      <div className="flex items-center justify-between mb-4">
        <div className="flex items-center gap-3">
          <div className="p-2 bg-blue-500/20 rounded-lg">
            <Target className="w-5 h-5 text-blue-400" />
          </div>
          <div>
            <h3 className="font-semibold text-white">Progreso del Curso</h3>
            <p className="text-xs text-gray-500">{progress.courseTitle}</p>
          </div>
        </div>

        {onDownloadReport && (
          <button
            onClick={onDownloadReport}
            className="p-2 text-gray-400 hover:text-white hover:bg-gray-700 rounded-lg transition-colors"
            title="Descargar reporte"
          >
            <Download className="w-4 h-4" />
          </button>
        )}
      </div>

      {/* Overall Progress Bar */}
      <div className="mb-6">
        <div className="flex items-center justify-between mb-2">
          <span className="text-sm text-gray-400">Progreso General</span>
          <span className="text-lg font-bold text-white">{progress.overallProgress}%</span>
        </div>
        <div className="h-3 bg-gray-700 rounded-full overflow-hidden">
          <div
            className="h-full bg-gradient-to-r from-blue-600 to-green-500 rounded-full transition-all duration-500"
            style={{ width: `${progress.overallProgress}%` }}
          />
        </div>
      </div>

      {/* Stats Grid */}
      <div className="grid grid-cols-4 gap-3 mb-6">
        <div className="p-3 bg-gray-900/50 rounded-lg text-center">
          <div className="flex items-center justify-center gap-1 mb-1">
            <BookOpen className="w-4 h-4 text-blue-400" />
          </div>
          <div className="text-lg font-bold text-white">
            {progress.completedLessons}/{progress.totalLessons}
          </div>
          <div className="text-xs text-gray-500">Lecciones</div>
        </div>
        <div className="p-3 bg-gray-900/50 rounded-lg text-center">
          <div className="flex items-center justify-center gap-1 mb-1">
            <Trophy className="w-4 h-4 text-yellow-400" />
          </div>
          <div className="text-lg font-bold text-white">
            {progress.passedQuizzes}/{progress.totalQuizzes}
          </div>
          <div className="text-xs text-gray-500">Quizzes</div>
        </div>
        <div className="p-3 bg-gray-900/50 rounded-lg text-center">
          <div className="flex items-center justify-center gap-1 mb-1">
            <Clock className="w-4 h-4 text-purple-400" />
          </div>
          <div className="text-lg font-bold text-white">{formatTime(progress.timeSpentMinutes)}</div>
          <div className="text-xs text-gray-500">Tiempo</div>
        </div>
        <div className="p-3 bg-gray-900/50 rounded-lg text-center">
          <div className="flex items-center justify-center gap-1 mb-1">
            <Zap className="w-4 h-4 text-green-400" />
          </div>
          <div className="text-lg font-bold text-white">{progress.xpEarned}</div>
          <div className="text-xs text-gray-500">XP</div>
        </div>
      </div>

      {/* Timeline Info */}
      {(progress.startedAt || progress.lastAccessedAt) && (
        <div className="flex items-center justify-between p-3 bg-gray-900/50 rounded-lg mb-4 text-xs">
          <div className="flex items-center gap-2">
            <Calendar className="w-4 h-4 text-gray-500" />
            {progress.startedAt && (
              <span className="text-gray-400">
                Iniciado: <span className="text-white">{formatDate(progress.startedAt)}</span>
              </span>
            )}
          </div>
          <div className="flex items-center gap-2">
            <TrendingUp className="w-4 h-4 text-gray-500" />
            <span className="text-gray-400">{estimatedCompletion}</span>
          </div>
        </div>
      )}

      {/* Module List */}
      <div className="space-y-2">
        <div className="text-sm text-gray-400 mb-2">
          Modulos ({completedModules}/{totalModules})
        </div>

        {sortedModules.map((module, index) => {
          const moduleProgress =
            module.lessonsTotal > 0
              ? Math.round((module.lessonsCompleted / module.lessonsTotal) * 100)
              : 0;

          return (
            <div
              key={module.id}
              onClick={() => module.status !== 'locked' && onModuleClick?.(module.id)}
              className={`p-3 rounded-lg border transition-all ${getStatusBg(module.status)} ${
                module.status !== 'locked' ? 'cursor-pointer hover:border-gray-600' : ''
              }`}
            >
              <div className="flex items-center gap-3">
                {/* Status Icon */}
                <div className="flex-shrink-0">{getStatusIcon(module.status)}</div>

                {/* Content */}
                <div className="flex-1 min-w-0">
                  <div className="flex items-center justify-between">
                    <span
                      className={`font-medium truncate ${
                        module.status === 'locked' ? 'text-gray-500' : 'text-white'
                      }`}
                    >
                      {index + 1}. {module.title}
                    </span>
                    {module.status !== 'locked' && (
                      <ChevronRight className="w-4 h-4 text-gray-500 flex-shrink-0" />
                    )}
                  </div>

                  {/* Progress Bar */}
                  {module.status !== 'locked' && (
                    <div className="mt-2">
                      <div className="flex items-center justify-between text-xs mb-1">
                        <span className="text-gray-500">
                          {module.lessonsCompleted}/{module.lessonsTotal} lecciones
                        </span>
                        <span className="text-gray-400">{moduleProgress}%</span>
                      </div>
                      <div className="h-1.5 bg-gray-700 rounded-full overflow-hidden">
                        <div
                          className={`h-full rounded-full transition-all ${
                            module.status === 'completed' ? 'bg-green-500' : 'bg-blue-500'
                          }`}
                          style={{ width: `${moduleProgress}%` }}
                        />
                      </div>
                    </div>
                  )}

                  {/* Quiz Badge */}
                  {module.quizScore !== undefined && (
                    <div className="flex items-center gap-2 mt-2">
                      <span
                        className={`px-2 py-0.5 rounded text-xs ${
                          module.quizPassed
                            ? 'bg-green-500/20 text-green-400'
                            : 'bg-red-500/20 text-red-400'
                        }`}
                      >
                        Quiz: {module.quizScore}%
                      </span>
                      <span className="text-xs text-gray-500">
                        {formatTime(module.timeSpentMinutes)} / {formatTime(module.estimatedMinutes)}
                      </span>
                    </div>
                  )}
                </div>
              </div>
            </div>
          );
        })}
      </div>

      {/* Completion Message */}
      {progress.overallProgress === 100 && (
        <div className="mt-4 p-4 bg-gradient-to-r from-green-500/10 to-emerald-500/10 border border-green-500/30 rounded-lg text-center">
          <Trophy className="w-8 h-8 text-yellow-400 mx-auto mb-2" />
          <p className="text-green-400 font-medium">Curso Completado!</p>
          <p className="text-xs text-gray-400 mt-1">Has ganado {progress.xpEarned} XP</p>
        </div>
      )}
    </div>
  );
};

export default CourseProgressTracker;