// Audio Manager - handles all game sounds and music

export type SoundEffect = 'jump' | 'coin' | 'stomp' | 'death' | 'levelup' | 'gameover';

export class AudioManager {
    private sounds: Map<string, HTMLAudioElement> = new Map();
    private bgm: HTMLAudioElement | null = null;
    private isMuted: boolean = false;
    private volume: number = 0.5;
    private initialized: boolean = false;

    constructor() {
        if (typeof window !== 'undefined') {
            this.initSounds();
        }
    }

    private initSounds(): void {
        // Create audio elements with Web Audio API fallback
        const soundEffects: SoundEffect[] = ['jump', 'coin', 'stomp', 'death', 'levelup', 'gameover'];

        soundEffects.forEach(sound => {
            const audio = new Audio();
            audio.volume = this.volume;
            // Use data URLs for simple 8-bit sounds
            audio.src = this.getDataUrl(sound);
            audio.preload = 'auto';
            this.sounds.set(sound, audio);
        });

        // Background music
        this.bgm = new Audio();
        this.bgm.volume = this.volume * 0.3;
        this.bgm.loop = true;

        this.initialized = true;
    }

    private getDataUrl(sound: SoundEffect): string {
        // Generate simple 8-bit style sounds using oscillator tones encoded as data URLs
        // These are placeholder audio - in production, use actual audio files
        const ctx = new (window.AudioContext || (window as unknown as { webkitAudioContext: typeof AudioContext }).webkitAudioContext)();

        const frequencies: Record<SoundEffect, { freq: number; duration: number; type: OscillatorType }> = {
            jump: { freq: 400, duration: 0.15, type: 'square' },
            coin: { freq: 800, duration: 0.1, type: 'square' },
            stomp: { freq: 200, duration: 0.1, type: 'square' },
            death: { freq: 150, duration: 0.5, type: 'sawtooth' },
            levelup: { freq: 600, duration: 0.3, type: 'square' },
            gameover: { freq: 100, duration: 0.8, type: 'sawtooth' },
        };

        // Store context for later use
        this.audioContext = ctx;
        this.soundConfigs = frequencies;

        // Return empty data URL - we'll use Web Audio API directly
        return 'data:audio/wav;base64,UklGRiQAAABXQVZFZm10IBAAAAABAAEARKwAAIhYAQACABAAZGF0YQAAAAA=';
    }

    private audioContext: AudioContext | null = null;
    private soundConfigs: Record<SoundEffect, { freq: number; duration: number; type: OscillatorType }> | null = null;

    play(sound: SoundEffect): void {
        if (this.isMuted || !this.initialized) return;

        // Use Web Audio API for dynamic sound generation
        if (this.audioContext && this.soundConfigs) {
            try {
                const config = this.soundConfigs[sound];
                const oscillator = this.audioContext.createOscillator();
                const gainNode = this.audioContext.createGain();

                oscillator.type = config.type;
                oscillator.frequency.setValueAtTime(config.freq, this.audioContext.currentTime);

                // Frequency slide for jump sound
                if (sound === 'jump') {
                    oscillator.frequency.exponentialRampToValueAtTime(
                        config.freq * 2,
                        this.audioContext.currentTime + config.duration
                    );
                }

                // Frequency drop for death sound
                if (sound === 'death' || sound === 'gameover') {
                    oscillator.frequency.exponentialRampToValueAtTime(
                        config.freq * 0.5,
                        this.audioContext.currentTime + config.duration
                    );
                }

                // Coin sound - quick double beep
                if (sound === 'coin') {
                    oscillator.frequency.setValueAtTime(config.freq, this.audioContext.currentTime);
                    oscillator.frequency.setValueAtTime(config.freq * 1.5, this.audioContext.currentTime + 0.05);
                }

                gainNode.gain.setValueAtTime(this.volume * 0.3, this.audioContext.currentTime);
                gainNode.gain.exponentialRampToValueAtTime(0.01, this.audioContext.currentTime + config.duration);

                oscillator.connect(gainNode);
                gainNode.connect(this.audioContext.destination);

                oscillator.start(this.audioContext.currentTime);
                oscillator.stop(this.audioContext.currentTime + config.duration);
            } catch (e) {
                console.warn('Audio playback failed:', e);
            }
        }
    }

    playBGM(): void {
        if (this.isMuted || !this.bgm) return;

        // Create a simple looping melody using Web Audio API
        if (this.audioContext) {
            this.createBGMLoop();
        }
    }

    private bgmInterval: ReturnType<typeof setInterval> | null = null;

    private createBGMLoop(): void {
        if (!this.audioContext || this.bgmInterval) return;

        const notes = [262, 294, 330, 349, 392, 440, 494, 523]; // C major scale
        let noteIndex = 0;

        this.bgmInterval = setInterval(() => {
            if (this.isMuted || !this.audioContext) {
                if (this.bgmInterval) clearInterval(this.bgmInterval);
                return;
            }

            const oscillator = this.audioContext.createOscillator();
            const gainNode = this.audioContext.createGain();

            oscillator.type = 'square';
            oscillator.frequency.setValueAtTime(notes[noteIndex % notes.length], this.audioContext.currentTime);

            gainNode.gain.setValueAtTime(this.volume * 0.1, this.audioContext.currentTime);
            gainNode.gain.exponentialRampToValueAtTime(0.01, this.audioContext.currentTime + 0.15);

            oscillator.connect(gainNode);
            gainNode.connect(this.audioContext.destination);

            oscillator.start(this.audioContext.currentTime);
            oscillator.stop(this.audioContext.currentTime + 0.15);

            noteIndex++;
        }, 200);
    }

    stopBGM(): void {
        if (this.bgmInterval) {
            clearInterval(this.bgmInterval);
            this.bgmInterval = null;
        }
        if (this.bgm) {
            this.bgm.pause();
            this.bgm.currentTime = 0;
        }
    }

    setVolume(volume: number): void {
        this.volume = Math.max(0, Math.min(1, volume));

        this.sounds.forEach(audio => {
            audio.volume = this.volume;
        });

        if (this.bgm) {
            this.bgm.volume = this.volume * 0.3;
        }
    }

    getVolume(): number {
        return this.volume;
    }

    toggleMute(): boolean {
        this.isMuted = !this.isMuted;

        if (this.isMuted) {
            this.stopBGM();
        }

        return this.isMuted;
    }

    isSoundMuted(): boolean {
        return this.isMuted;
    }

    setMuted(muted: boolean): void {
        this.isMuted = muted;
        if (muted) {
            this.stopBGM();
        }
    }

    // Resume audio context (needed after user interaction)
    resume(): void {
        if (this.audioContext && this.audioContext.state === 'suspended') {
            this.audioContext.resume();
        }
    }
}

// Singleton instance
let audioManagerInstance: AudioManager | null = null;

export function getAudioManager(): AudioManager {
    if (!audioManagerInstance) {
        audioManagerInstance = new AudioManager();
    }
    return audioManagerInstance;
}