export default function artplayerPluginAmbilight(option = {}) {
    return (art) => {
        const { $video } = art.template;
        const { createElement, addClass, setStyles } = art.constructor.utils;
        const { blur = '50px', opacity = 0.5, frequency = 10, duration = 0.3 } = option;

        const $ambilight = createElement('div');
        const gridItems = createGridItems($ambilight);

        setupAmbilight($ambilight, $video);
        setupGridItems(gridItems, blur, opacity, duration);

        const updateColors = createColorUpdater($video, gridItems, frequency);

        let animationFrameId = null;

        function start() {
            if (!animationFrameId) {
                updateColors();
            }
        }

        function stop() {
            if (animationFrameId) {
                cancelAnimationFrame(animationFrameId);
                animationFrameId = null;
            }
        }

        art.on('ready', start);
        art.on('destroy', stop);

        return {
            name: 'artplayerPluginAmbilight',
            start,
            stop,
        };

        function createGridItems($ambilight) {
            $ambilight.innerHTML = Array(9).fill('<div></div>').join('');
            return Array.from($ambilight.children);
        }

        function setupAmbilight($ambilight, $video) {
            addClass($ambilight, 'artplayer-plugin-ambilight');
            $video.parentNode.insertBefore($ambilight, $video);
            setStyles($ambilight, {
                position: 'absolute',
                top: 0,
                left: 0,
                zIndex: 9,
                inset: 0,
                display: 'grid',
                gridTemplateColumns: '1fr 1fr 1fr',
                gridTemplateRows: '1fr 1fr 1fr',
            });
        }

        function setupGridItems(gridItems, blur, opacity, duration) {
            gridItems.forEach(($item) => {
                setStyles($item, {
                    opacity,
                    filter: `blur(${blur})`,
                    transition: `background-color ${duration}s ease`,
                });
            });
        }

        function createColorUpdater($video, gridItems, frequency) {
            const canvas = createElement('canvas');
            const ctx = canvas.getContext('2d');
            canvas.width = 3;
            canvas.height = 3;

            function getAverageColor(x, y, w, h) {
                ctx.drawImage($video, x, y, w, h, 0, 0, 1, 1);
                const [r, g, b] = ctx.getImageData(0, 0, 1, 1).data;
                return `rgb(${r}, ${g}, ${b})`;
            }

            let lastUpdateTime = 0;

            return function updateColors() {
                const now = performance.now();
                if (now - lastUpdateTime < 1000 / frequency || !art.playing) {
                    animationFrameId = requestAnimationFrame(updateColors);
                    return;
                }

                lastUpdateTime = now;

                const w = $video.videoWidth / 3;
                const h = $video.videoHeight / 3;

                const colors = [
                    [0, 0],
                    [w, 0],
                    [2 * w, 0],
                    [0, h],
                    [w, h],
                    [2 * w, h],
                    [0, 2 * h],
                    [w, 2 * h],
                    [2 * w, 2 * h],
                ].map(([x, y]) => getAverageColor(x, y, w, h));

                gridItems.forEach(($item, index) => {
                    $item.style.backgroundColor = colors[index];
                });

                animationFrameId = requestAnimationFrame(updateColors);
            };
        }
    };
}

if (typeof window !== 'undefined') {
    window['artplayerPluginAmbilight'] = artplayerPluginAmbilight;
}