/**
 * Video Player Manager
 * Handles video playback, management, and integration with game modes
 */

class VideoPlayerManager {
    constructor() {
        this.currentPlayer = null;
        this.backgroundPlayer = null;
        this.overlayPlayer = null;
        this.videoLibrary = {
            background: [],
            task: [],
            reward: [],
            punishment: []
        };
        this.settings = {
            enabled: true,
            backgroundVideos: true,
            taskVideos: true,
            autoplay: true,
            loop: true,
            volume: 0.3,
            muted: false,
            playbackRate: 1.0,
            showControls: false,
            fadeTransitions: true
        };
        this.isInitialized = false;
        this.loadSettings();
    }

    /**
     * Initialize the video player system
     */
    async init() {
        console.log('🎬 Initializing Video Player Manager...');
        
        try {
            this.createVideoPlayers();
            this.bindEvents();
            await this.scanVideoLibrary();
            this.isInitialized = true;
            console.log('✅ Video Player Manager initialized successfully');
        } catch (error) {
            console.error('❌ Failed to initialize Video Player Manager:', error);
        }
    }

    /**
     * Create video player elements
     */
    createVideoPlayers() {
        // Background video player (behind content)
        this.backgroundPlayer = this.createVideoElement('background-video-player', {
            loop: true,
            muted: true,
            autoplay: true,
            style: `
                position: fixed;
                top: 0;
                left: 0;
                width: 100vw;
                height: 100vh;
                object-fit: cover;
                z-index: -1;
                opacity: 0.3;
                pointer-events: none;
            `
        });

        // Task video player (in content area)
        this.currentPlayer = this.createVideoElement('task-video-player', {
            controls: this.settings.showControls,
            style: `
                max-width: 100%;
                max-height: 70vh;
                border-radius: 8px;
                display: none;
            `
        });

        // Overlay video player (for popups/punishments)
        this.overlayPlayer = this.createVideoElement('overlay-video-player', {
            autoplay: true,
            style: `
                position: fixed;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                max-width: 80vw;
                max-height: 80vh;
                z-index: 10000;
                border-radius: 8px;
                box-shadow: 0 0 50px rgba(0,0,0,0.8);
                display: none;
            `
        });

        // Add players to DOM
        document.body.appendChild(this.backgroundPlayer);
        document.body.appendChild(this.overlayPlayer);
        
        // Add task player to game container
        const gameContainer = document.querySelector('.game-container') || document.body;
        gameContainer.appendChild(this.currentPlayer);
    }

    /**
     * Create a video element with specified attributes
     */
    createVideoElement(id, attributes = {}) {
        const video = document.createElement('video');
        video.id = id;
        
        // Set default attributes
        video.preload = 'metadata';
        video.playsInline = true;
        video.webkit = { playsinline: true };
        
        // Apply custom attributes
        Object.entries(attributes).forEach(([key, value]) => {
            if (key === 'style') {
                video.style.cssText = value;
            } else {
                video[key] = value;
            }
        });

        // Add event listeners
        video.addEventListener('loadstart', () => console.log(`🎬 Loading video: ${video.src}`));
        video.addEventListener('canplay', () => console.log(`✅ Video ready: ${video.src}`));
        video.addEventListener('error', (e) => console.error(`❌ Video error: ${e.message}`));
        video.addEventListener('ended', (e) => this.handleVideoEnd(e));

        return video;
    }

    /**
     * Scan video directory for available videos
     */
    async scanVideoLibrary() {
        console.log('📁 Scanning video library...');
        
        const categories = ['background', 'task', 'reward', 'punishment'];
        
        for (const category of categories) {
            try {
                // In Electron environment, use the desktop file manager
                if (window.electronAPI && window.desktopFileManager) {
                    // Use unified video library - get all videos and filter by category if needed
                    const allVideos = window.desktopFileManager.getAllVideos();
                    
                    // For now, just use all videos for any category since we removed categories
                    // In the future, we could add tags or other filtering mechanisms
                    this.videoLibrary[category] = allVideos;
                } else {
                    // In browser environment, try to load from unified storage
                    const unifiedData = JSON.parse(localStorage.getItem('unifiedVideoLibrary') || '{}');
                    this.videoLibrary[category] = unifiedData.allVideos || [];
                }
                
                console.log(`📹 Found ${this.videoLibrary[category].length} ${category} videos (from unified library)`);
            } catch (error) {
                console.warn(`⚠️ Could not load ${category} videos:`, error);
                this.videoLibrary[category] = [];
            }
        }
    }

    /**
     * Get known videos for browser environment (fallback)
     */
    getKnownVideos(category) {
        // This would need to be populated manually in browser environment
        // or through a manifest file
        return [];
    }

    /**
     * Reload video files from storage (called when new videos are imported)
     */
    async loadVideoFiles() {
        console.log('🔄 Reloading video library...');
        await this.scanVideoLibrary();
    }

    /**
     * Play background video
     */
    async playBackgroundVideo(videoPath = null) {
        if (!this.settings.backgroundVideos || !this.backgroundPlayer) return;

        try {
            if (!videoPath) {
                const backgroundVideos = this.videoLibrary.background;
                if (backgroundVideos.length === 0) return;
                videoPath = backgroundVideos[Math.floor(Math.random() * backgroundVideos.length)];
            }

            const fullPath = this.getVideoPath(videoPath);
            console.log(`🎬 Playing background video: ${fullPath}`);

            if (this.settings.fadeTransitions) {
                await this.fadeOut(this.backgroundPlayer);
            }

            this.backgroundPlayer.src = fullPath;
            this.backgroundPlayer.volume = this.settings.volume * 0.5; // Background videos quieter
            this.backgroundPlayer.muted = this.settings.muted;
            this.backgroundPlayer.playbackRate = this.settings.playbackRate;
            
            await this.backgroundPlayer.play();

            if (this.settings.fadeTransitions) {
                await this.fadeIn(this.backgroundPlayer);
            }

        } catch (error) {
            console.error('❌ Failed to play background video:', error);
        }
    }

    /**
     * Play task video
     */
    async playTaskVideo(videoPath, container = null) {
        if (!this.settings.taskVideos || !this.currentPlayer) return;

        try {
            const fullPath = this.getVideoPath(videoPath);
            console.log(`🎬 Playing task video: ${fullPath}`);

            // Position player in specified container
            if (container) {
                container.appendChild(this.currentPlayer);
            }

            this.currentPlayer.src = fullPath;
            this.currentPlayer.volume = this.settings.volume;
            this.currentPlayer.muted = this.settings.muted;
            this.currentPlayer.controls = this.settings.showControls;
            this.currentPlayer.style.display = 'block';

            if (this.settings.autoplay) {
                await this.currentPlayer.play();
            }

            if (this.settings.fadeTransitions) {
                await this.fadeIn(this.currentPlayer);
            }

        } catch (error) {
            console.error('❌ Failed to play task video:', error);
        }
    }

    /**
     * Play overlay video (for punishments/rewards)
     */
    async playOverlayVideo(videoPath, options = {}) {
        if (!this.overlayPlayer) return;

        try {
            const fullPath = this.getVideoPath(videoPath);
            console.log(`🎬 Playing overlay video: ${fullPath}`);

            const {
                duration = null,
                closeable = false,
                onComplete = null,
                volume = this.settings.volume
            } = options;

            this.overlayPlayer.src = fullPath;
            this.overlayPlayer.volume = volume;
            this.overlayPlayer.muted = this.settings.muted;
            this.overlayPlayer.style.display = 'block';

            // Add close button if closeable
            if (closeable) {
                this.addCloseButton(this.overlayPlayer);
            }

            await this.overlayPlayer.play();

            if (this.settings.fadeTransitions) {
                await this.fadeIn(this.overlayPlayer);
            }

            // Auto-close after duration
            if (duration) {
                setTimeout(() => {
                    this.closeOverlayVideo();
                    if (onComplete) onComplete();
                }, duration);
            }

        } catch (error) {
            console.error('❌ Failed to play overlay video:', error);
        }
    }

    /**
     * Close overlay video
     */
    async closeOverlayVideo() {
        if (!this.overlayPlayer) return;

        if (this.settings.fadeTransitions) {
            await this.fadeOut(this.overlayPlayer);
        }

        this.overlayPlayer.pause();
        this.overlayPlayer.style.display = 'none';
        this.overlayPlayer.src = '';

        // Remove close button if exists
        const closeBtn = this.overlayPlayer.nextElementSibling;
        if (closeBtn && closeBtn.classList.contains('video-close-btn')) {
            closeBtn.remove();
        }
    }

    /**
     * Stop all videos
     */
    stopAllVideos() {
        [this.backgroundPlayer, this.currentPlayer, this.overlayPlayer].forEach(player => {
            if (player) {
                player.pause();
                player.currentTime = 0;
            }
        });
    }

    /**
     * Pause all videos
     */
    pauseAllVideos() {
        [this.backgroundPlayer, this.currentPlayer, this.overlayPlayer].forEach(player => {
            if (player && !player.paused) {
                player.pause();
            }
        });
    }

    /**
     * Resume all videos
     */
    resumeAllVideos() {
        [this.backgroundPlayer, this.currentPlayer, this.overlayPlayer].forEach(player => {
            if (player && player.paused) {
                player.play().catch(console.error);
            }
        });
    }

    /**
     * Get random video from category
     */
    getRandomVideo(category) {
        const videos = this.videoLibrary[category] || [];
        if (videos.length === 0) return null;
        
        // Filter out disabled videos
        const disabledVideos = JSON.parse(localStorage.getItem('disabledVideos') || '[]');
        const enabledVideos = videos.filter(video => {
            const videoPath = typeof video === 'string' ? video : video.path;
            return !disabledVideos.includes(videoPath);
        });
        
        if (enabledVideos.length === 0) {
            console.warn('⚠️ All videos in category disabled, using full list');
            return videos[Math.floor(Math.random() * videos.length)];
        }
        
        return enabledVideos[Math.floor(Math.random() * enabledVideos.length)];
    }

    /**
     * Get all enabled videos from a category (filters out disabled videos)
     */
    getEnabledVideos(category) {
        const videos = this.videoLibrary[category] || [];
        if (videos.length === 0) return [];
        
        // Filter out disabled videos
        const disabledVideos = JSON.parse(localStorage.getItem('disabledVideos') || '[]');
        const enabledVideos = videos.filter(video => {
            const videoPath = typeof video === 'string' ? video : video.path;
            return !disabledVideos.includes(videoPath);
        });
        
        return enabledVideos;
    }

    /**
     * Get full path for video
     */
    getVideoPath(videoPath) {
        // Handle null/undefined
        if (!videoPath) {
            console.error('❌ getVideoPath received null/undefined videoPath');
            return '';
        }
        
        // Handle objects (extract path property)
        if (typeof videoPath === 'object') {
            if (videoPath.path) {
                videoPath = videoPath.path;
            } else {
                console.error('❌ getVideoPath received object without path property:', videoPath);
                return '';
            }
        }
        
        // Ensure it's a string
        if (typeof videoPath !== 'string') {
            console.error('❌ getVideoPath received non-string:', typeof videoPath, videoPath);
            return '';
        }
        
        // Already a full URL
        if (videoPath.startsWith('http') || videoPath.startsWith('file:')) {
            return videoPath;
        }
        
        // Absolute path (Windows: C:\... or E:\..., Unix: /...)
        if (videoPath.match(/^[A-Z]:\\/i) || videoPath.startsWith('/')) {
            // Convert to file:// URL for Electron
            const normalizedPath = videoPath.replace(/\\/g, '/');
            return `file:///${normalizedPath}`;
        }
        
        // Relative path - add video/ prefix
        return `video/${videoPath}`;
    }

    /**
     * Add close button to video
     */
    addCloseButton(videoElement) {
        const closeBtn = document.createElement('button');
        closeBtn.className = 'video-close-btn';
        closeBtn.innerHTML = '✕';
        closeBtn.style.cssText = `
            position: fixed;
            top: calc(${videoElement.style.top} - 30px);
            right: calc(50% - ${videoElement.offsetWidth/2}px + ${videoElement.offsetWidth}px - 30px);
            z-index: 10001;
            background: rgba(0,0,0,0.8);
            color: white;
            border: none;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            cursor: pointer;
            font-size: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
        `;

        closeBtn.addEventListener('click', () => this.closeOverlayVideo());
        videoElement.parentNode.insertBefore(closeBtn, videoElement.nextSibling);
    }

    /**
     * Fade in animation
     */
    fadeIn(element, duration = 500) {
        return new Promise(resolve => {
            element.style.opacity = '0';
            element.style.transition = `opacity ${duration}ms ease-in-out`;
            
            requestAnimationFrame(() => {
                element.style.opacity = element.id === 'background-video-player' ? '0.3' : '1';
                setTimeout(resolve, duration);
            });
        });
    }

    /**
     * Fade out animation
     */
    fadeOut(element, duration = 500) {
        return new Promise(resolve => {
            element.style.transition = `opacity ${duration}ms ease-in-out`;
            element.style.opacity = '0';
            setTimeout(resolve, duration);
        });
    }

    /**
     * Handle video end events
     */
    handleVideoEnd(event) {
        const video = event.target;
        
        if (video === this.backgroundPlayer && this.settings.loop) {
            // Start next background video
            this.playBackgroundVideo();
        } else if (video === this.overlayPlayer) {
            // Auto-close overlay videos
            this.closeOverlayVideo();
        }
    }

    /**
     * Update settings
     */
    updateSettings(newSettings) {
        this.settings = { ...this.settings, ...newSettings };
        this.saveSettings();
        this.applySettings();
    }

    /**
     * Apply current settings to players
     */
    applySettings() {
        [this.backgroundPlayer, this.currentPlayer, this.overlayPlayer].forEach(player => {
            if (player) {
                player.volume = this.settings.volume;
                player.muted = this.settings.muted;
                player.playbackRate = this.settings.playbackRate;
                if (player === this.currentPlayer) {
                    player.controls = this.settings.showControls;
                }
            }
        });
    }

    /**
     * Load settings from localStorage
     */
    loadSettings() {
        const saved = localStorage.getItem('videoPlayerSettings');
        if (saved) {
            this.settings = { ...this.settings, ...JSON.parse(saved) };
        }
    }

    /**
     * Save settings to localStorage
     */
    saveSettings() {
        localStorage.setItem('videoPlayerSettings', JSON.stringify(this.settings));
    }

    /**
     * Bind event listeners
     */
    bindEvents() {
        // Game pause/resume integration
        document.addEventListener('gamepaused', () => this.pauseAllVideos());
        document.addEventListener('gameresumed', () => this.resumeAllVideos());
        
        // Cleanup on page unload
        window.addEventListener('beforeunload', () => this.stopAllVideos());
    }

    /**
     * Get video library info
     */
    getLibraryInfo() {
        return {
            background: this.videoLibrary.background.length,
            task: this.videoLibrary.task.length,
            reward: this.videoLibrary.reward.length,
            punishment: this.videoLibrary.punishment.length,
            total: Object.values(this.videoLibrary).flat().length
        };
    }
}

// Create global instance
window.videoPlayerManager = new VideoPlayerManager();

// Auto-initialize when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
    if (window.videoPlayerManager) {
        window.videoPlayerManager.init();
    }
});

console.log('🎬 Video Player Manager loaded');