export class AudioManager {
  private audioCtx: AudioContext | null = null;

  public init() {
    try {
      // Lazy initialize AudioContext on the first player interaction.
      // Browsers restrict audio context creation until a user gesture occurs.
      if (!this.audioCtx) {
        const AudioContextClass = window.AudioContext || (window as any).webkitAudioContext;
        if (AudioContextClass) {
          this.audioCtx = new AudioContextClass();
        }
      }
      
      // Auto-resumed suspended context if it was blocked by autoplay policies
      if (this.audioCtx && this.audioCtx.state === 'suspended') {
        this.audioCtx.resume().catch(() => {
          // Ignore failures to resume context as it will retry on the next user action
        });
      }
    } catch (error) {
      // Fail silently to ensure the game remains fully playable even if audio fails to load
      console.warn('AudioManager failed to initialize:', error);
      this.audioCtx = null;
    }
  }

  public playTurnSound() {
    if (!this.audioCtx) return;
    try {
      const osc = this.audioCtx.createOscillator();
      const gain = this.audioCtx.createGain();
      
      osc.type = 'triangle';
      osc.frequency.setValueAtTime(500, this.audioCtx.currentTime);
      osc.frequency.exponentialRampToValueAtTime(150, this.audioCtx.currentTime + 0.05);
      
      gain.gain.setValueAtTime(0.2, this.audioCtx.currentTime);
      gain.gain.exponentialRampToValueAtTime(0.001, this.audioCtx.currentTime + 0.05);
      
      osc.connect(gain);
      gain.connect(this.audioCtx.destination);
      
      osc.start();
      osc.stop(this.audioCtx.currentTime + 0.05);
    } catch (e) {
      console.warn('Failed to play turn sound:', e);
    }
  }

  public playEatSound() {
    if (!this.audioCtx) return;
    try {
      const osc = this.audioCtx.createOscillator();
      const gain = this.audioCtx.createGain();
      
      osc.type = 'sine';
      osc.frequency.setValueAtTime(600, this.audioCtx.currentTime);
      osc.frequency.setValueAtTime(900, this.audioCtx.currentTime + 0.1);
      
      gain.gain.setValueAtTime(0.3, this.audioCtx.currentTime);
      gain.gain.exponentialRampToValueAtTime(0.001, this.audioCtx.currentTime + 0.2);
      
      osc.connect(gain);
      gain.connect(this.audioCtx.destination);
      
      osc.start();
      osc.stop(this.audioCtx.currentTime + 0.2);
    } catch (e) {
      console.warn('Failed to play eat sound:', e);
    }
  }

  public playDieSound() {
    if (!this.audioCtx) return;
    try {
      const osc = this.audioCtx.createOscillator();
      const gain = this.audioCtx.createGain();
      
      osc.type = 'sawtooth';
      osc.frequency.setValueAtTime(150, this.audioCtx.currentTime);
      osc.frequency.exponentialRampToValueAtTime(40, this.audioCtx.currentTime + 0.4);
      
      gain.gain.setValueAtTime(0.4, this.audioCtx.currentTime);
      gain.gain.exponentialRampToValueAtTime(0.001, this.audioCtx.currentTime + 0.4);
      
      osc.connect(gain);
      gain.connect(this.audioCtx.destination);
      
      osc.start();
      osc.stop(this.audioCtx.currentTime + 0.4);
    } catch (e) {
      console.warn('Failed to play die sound:', e);
    }
  }
}