"use strict";

const HitExplosionSound = (function(){

    return function(audio_ctx, output_node, volume_multiplier = 1.0){
        const now = audio_ctx.currentTime;

        const buffer_size = audio_ctx.sampleRate * 0.48;
        const buffer = audio_ctx.createBuffer(1, buffer_size, audio_ctx.sampleRate);
        const data = buffer.getChannelData(0);
        for(let i = 0; i < buffer_size; i++){
            data[i] = (Math.random() * 2) - 1;
        }

        const noise = audio_ctx.createBufferSource();
        noise.buffer = buffer;

        const filter = audio_ctx.createBiquadFilter();
        const gain = audio_ctx.createGain();

        // Ruido sordo filtrado en graves
        filter.type = "lowpass";
        filter.frequency.setValueAtTime(420, now);
        filter.frequency.exponentialRampToValueAtTime(32, now + 0.48);

        gain.gain.setValueAtTime(0.9 * volume_multiplier, now);
        gain.gain.exponentialRampToValueAtTime(0.001, now + 0.48);

        noise.connect(filter);
        filter.connect(gain);
        gain.connect(output_node);

        // Subgrave sintetizado para dar golpe de casco en el vacío
        const osc = audio_ctx.createOscillator();
        const osc_gain = audio_ctx.createGain();
        osc.type = "triangle";
        osc.frequency.setValueAtTime(130, now);
        osc.frequency.exponentialRampToValueAtTime(25, now + 0.35);

        osc_gain.gain.setValueAtTime(0.8 * volume_multiplier, now);
        osc_gain.gain.exponentialRampToValueAtTime(0.001, now + 0.35);

        osc.connect(osc_gain);
        osc_gain.connect(output_node);

        osc.start(now);
        osc.stop(now + 0.35);
        noise.start(now);
        noise.stop(now + 0.48);
    };

})();