// Please dont remove this attribution its required by the license of this code.
// This code is licensed under the CPSL License.
//
// Original code by: @chillcog
// See https://git.chillcog.com/chillcog/azuracast-themes
// Copyright (c) 2024-2026 ChillCog
// 

document.addEventListener("DOMContentLoaded", function () {
    const scanline = document.createElement('div');
    scanline.id = 'backrooms-scanlines';
    Object.assign(scanline.style, {
        position: 'fixed',
        top: '0',
        left: '0',
        width: '100vw',
        height: '100vh',
        background: 'linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.15) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.03), rgba(0, 255, 0, 0.01), rgba(0, 0, 255, 0.03))',
        backgroundSize: '100% 4px, 6px 100%',
        zIndex: '9999',
        pointerEvents: 'none'
    });
    document.body.appendChild(scanline);

    let audioCtx = null;
    let humOsc = null;
    let buzzOsc = null;
    let gainNode = null;

    function startFluorescentHum() {
        if (audioCtx) return;
        audioCtx = new (window.AudioContext || window.webkitAudioContext)();
        gainNode = audioCtx.createGain();
        gainNode.gain.setValueAtTime(0.015, audioCtx.currentTime);
        gainNode.connect(audioCtx.destination);
        humOsc = audioCtx.createOscillator();
        humOsc.type = 'sine';
        humOsc.frequency.setValueAtTime(60, audioCtx.currentTime);
        humOsc.connect(gainNode);
        humOsc.start();
        buzzOsc = audioCtx.createOscillator();
        buzzOsc.type = 'sawtooth';
        buzzOsc.frequency.setValueAtTime(120, audioCtx.currentTime);
        const filter = audioCtx.createBiquadFilter();
        filter.type = 'lowpass';
        filter.frequency.setValueAtTime(200, audioCtx.currentTime);
        buzzOsc.connect(filter);
        filter.connect(gainNode);
        buzzOsc.start();
    }

    window.addEventListener('click', startFluorescentHum, { once: true });
    window.addEventListener('touchstart', startFluorescentHum, { once: true });
});