/**
 * Sound Manager for RTS Game
 * Handles loading and playing sound effects
 * 
 * Features:
 * - Async sound loading
 * - Volume control
 * - Enable/disable toggle
 * - Multiple concurrent sounds
 * - Fallback for unsupported formats
 */

class SoundManager {
    constructor() {
        this.sounds = {};
        this.enabled = true;
        this.volume = 0.5;
        this.loaded = false;
        this.audioContext = null;
        
        // Initialize Audio Context (for better browser support)
        try {
            this.audioContext = new (window.AudioContext || window.webkitAudioContext)();
        } catch (e) {
            console.warn('[SoundManager] Web Audio API not supported, using HTML5 Audio fallback');
        }
    }
    
    /**
     * Load all game sounds
     */
    async loadAll() {
        console.log('[SoundManager] Loading sounds...');
        
        const soundFiles = {
            'unit_fire': '/static/sounds/fire.wav',
            'explosion': '/static/sounds/explosion.wav',
            'build_complete': '/static/sounds/build.wav',
            'unit_ready': '/static/sounds/ready.wav',
        };
        
        const loadPromises = Object.entries(soundFiles).map(([name, url]) => 
            this.loadSound(name, url)
        );
        
        await Promise.all(loadPromises);
        this.loaded = true;
        console.log(`[SoundManager] Loaded ${Object.keys(this.sounds).length} sounds`);
    }
    
    /**
     * Load a single sound file
     */
    async loadSound(name, url) {
        try {
            const audio = new Audio(url);
            audio.preload = 'auto';
            audio.volume = this.volume;
            
            // Wait for audio to be ready
            await new Promise((resolve, reject) => {
                audio.addEventListener('canplaythrough', resolve, { once: true });
                audio.addEventListener('error', reject, { once: true });
                audio.load();
            });
            
            this.sounds[name] = audio;
            console.log(`[SoundManager] Loaded: ${name}`);
        } catch (e) {
            console.warn(`[SoundManager] Failed to load sound: ${name}`, e);
        }
    }
    
    /**
     * Play a sound effect
     * @param {string} name - Sound name
     * @param {number} volumeMultiplier - Optional volume multiplier (0.0-1.0)
     */
    play(name, volumeMultiplier = 1.0) {
        if (!this.enabled || !this.loaded || !this.sounds[name]) {
            return;
        }
        
        try {
            // Clone the audio element to allow multiple concurrent plays
            const audio = this.sounds[name].cloneNode();
            audio.volume = this.volume * volumeMultiplier;
            
            // Play and auto-cleanup
            audio.play().catch(e => {
                // Ignore play errors (user interaction required, etc.)
                console.debug(`[SoundManager] Play failed: ${name}`, e.message);
            });
            
            // Remove after playing to free memory
            audio.addEventListener('ended', () => {
                audio.src = '';
                audio.remove();
            });
        } catch (e) {
            console.debug(`[SoundManager] Error playing sound: ${name}`, e);
        }
    }
    
    /**
     * Toggle sound on/off
     */
    toggle() {
        this.enabled = !this.enabled;
        console.log(`[SoundManager] Sound ${this.enabled ? 'enabled' : 'disabled'}`);
        return this.enabled;
    }
    
    /**
     * Set volume (0.0 - 1.0)
     */
    setVolume(volume) {
        this.volume = Math.max(0, Math.min(1, volume));
        
        // Update volume for all loaded sounds
        Object.values(this.sounds).forEach(audio => {
            audio.volume = this.volume;
        });
        
        console.log(`[SoundManager] Volume set to ${Math.round(this.volume * 100)}%`);
    }
    
    /**
     * Check if sounds are loaded
     */
    isLoaded() {
        return this.loaded;
    }
    
    /**
     * Get sound status
     */
    getStatus() {
        return {
            enabled: this.enabled,
            volume: this.volume,
            loaded: this.loaded,
            soundCount: Object.keys(this.sounds).length,
        };
    }
}

// Export for use in game.js
window.SoundManager = SoundManager;