import ArtPlayerError from './ArtPlayerError';

export function errorHandle(condition, msg) {
    if (!condition) {
        throw new ArtPlayerError(msg);
    }
    return condition;
}

export function clamp(num, a, b) {
    return Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b));
}

export function getExt(url) {
    if (url.includes('?')) {
        return getExt(url.split('?')[0]);
    }

    if (url.includes('#')) {
        return getExt(url.split('#')[0]);
    }

    return url
        .trim()
        .toLowerCase()
        .split('.')
        .pop();
}

export function secondToTime(second) {
    const add0 = num => (num < 10 ? `0${num}` : String(num));
    const hour = Math.floor(second / 3600);
    const min = Math.floor((second - hour * 3600) / 60);
    const sec = Math.floor(second - hour * 3600 - min * 60);
    return (hour > 0 ? [hour, min, sec] : [min, sec]).map(add0).join(':');
}

export function sleep(ms = 0) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

export function debounce(func, wait, context) {
    let timeout;
    function fn(...args) {
        const later = function later() {
            timeout = null;
            func.apply(context, args);
        };
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
    }

    fn.clearTimeout = function ct() {
        clearTimeout(timeout);
    };

    return fn;
}

export function mergeDeep(...objects) {
    const isObject = item => item && typeof item === 'object' && !Array.isArray(item);
    return objects.reduce((prev, obj) => {
        Object.keys(obj).forEach(key => {
            const pVal = prev[key];
            const oVal = obj[key];
            if (Array.isArray(pVal) && Array.isArray(oVal)) {
                prev[key] = pVal.concat(...oVal);
            } else if (isObject(pVal) && isObject(oVal) && !(oVal instanceof Element)) {
                prev[key] = mergeDeep(pVal, oVal);
            } else {
                prev[key] = oVal;
            }
        });
        return prev;
    }, {});
}

export function append(parent, child) {
    if (child instanceof Element) {
        parent.appendChild(child);
    } else {
        parent.insertAdjacentHTML('beforeend', String(child));
    }
    return parent.lastElementChild || parent.lastChild;
}

export function remove(child) {
    return child.parentNode.removeChild(child);
}

export function setStyle(element, key, value) {
    element.style[key] = value;
    return element;
}

export function setStyles(element, styles) {
    Object.keys(styles).forEach(key => {
        setStyle(element, key, styles[key]);
    });
    return element;
}

export function getStyle(element, key, numberType = true) {
    const value = window.getComputedStyle(element, null).getPropertyValue(key);
    return numberType ? parseFloat(value) : value;
}

export function sublings(target) {
    return Array.from(target.parentElement.children).filter(item => item !== target);
}

export function inverseClass(target, className) {
    sublings(target).forEach(item => item.classList.remove(className));
    target.classList.add(className);
}

export function tooltip(target, msg, pos = 'up') {
    target.setAttribute('data-balloon', msg);
    target.setAttribute('data-balloon-pos', pos);
}

export function srtToVtt(srtText) {
    return 'WEBVTT \r\n\r\n'.concat(
        srtText
            .replace(/\{\\([ibu])\}/g, '</$1>')
            .replace(/\{\\([ibu])1\}/g, '<$1>')
            .replace(/\{([ibu])\}/g, '<$1>')
            .replace(/\{\/([ibu])\}/g, '</$1>')
            .replace(/(\d\d:\d\d:\d\d),(\d\d\d)/g, '$1.$2')
            .concat('\r\n\r\n'),
    );
}

export function vttToBlob(vttText) {
    return URL.createObjectURL(
        new Blob([vttText], {
            type: 'text/vtt',
        }),
    );
}

export function downloadFile(url, name) {
    const elink = document.createElement('a');
    setStyle(elink, 'display', 'none');
    elink.href = url;
    elink.download = name;
    document.body.appendChild(elink);
    elink.click();
    document.body.removeChild(elink);
}