export function createElement({ innerText, textContent, onclick, onchange, onkeydown, children = [], dataset, style, classList = [], ...attributes }, tagName = 'div') {
    const element = document.createElement(tagName)
    for (const key in attributes) element.setAttribute(key, attributes[key])
    if (style) Object.assign(element.style, style)
    if (classList.length) element.classList.add(...classList)
    if (textContent) element.textContent = textContent
    if (innerText) element.innerText = innerText
    if (onkeydown) element.onkeydown = onkeydown
    if (onchange) element.onchange = onchange
    if (onclick) element.onclick = onclick
    if (dataset) Object.assign(element.dataset, dataset)
    if (children) children.forEach(child => element.appendChild(child))
    return element
}

export function List(options) {
    return createElement(options, 'ul')
}

export function ListItem(options) {
    return createElement(options, 'li')
}

export function Span(options) {
    return createElement(options, 'span')
}

export function Button(options) {
    return createElement(options, 'button')
}

export function Input(options) {
    return createElement(options, 'input')
}

export function Avatar(options) {
    const element = createElement(options, 'img')
    element.onerror = () => element.src = '/favicon.ico'
    return element
}

// 弹出窗口, 高斯模糊背景, 进入离开动画过渡
export function Dialog(options) {
    const element = createElement({
        tabIndex: 0,
        style: {
            position: 'fixed',
            top: 0,
            left: 0,
            zIndex: 1000,
            width: '100%',
            height: '100%',
            backdropFilter: 'blur(5px)',
            duration: '0.5s',
            transition: 'all 0.5s'
        },
        onclick: async event => {
            await event.target.animate([{ opacity: 1 }, { opacity: 0 }], { duration: 100 }).finished
            await event.target.remove()
        },
        onkeydown: async event => {
            if (event.key !== 'Escape') return
            await event.target.animate([{ opacity: 1 }, { opacity: 0 }], { duration: 100 }).finished
            await event.target.remove()
        },
        children: [
            createElement({
                ...options,
                style: {
                    position: 'fixed',
                    top: '50%',
                    left: '50%',
                    transform: 'translate(-50%, -50%)',
                    backgroundColor: '#fff',
                    borderRadius: '150px',
                    boxShadow: '0 0 1em #ccc',
                    overflow: 'hidden',
                    display: 'flex',
                    justifyContent: 'center',
                    ...options.style,
                }
            })
        ]
    })
    // 显示时自动聚焦
    const observer = new MutationObserver(mutationsList => {
        for (const mutation of mutationsList) {
            if (mutation.type === 'childList' && mutation.addedNodes.length > 0) {
                element.focus()
                element.animate([{ opacity: 0 }, { opacity: 1 }], { duration: 100 }).finished
                return observer.disconnect()
            }
        }
    })
    observer.observe(document.body, { childList: true, subtree: true })
    return element
}

// 深度代理, 用于监听数据的变化
export function useProxy(obj, callback) {
    return new Proxy(obj, {
        get(target, key) {
            if (typeof target[key] === 'object' && target[key] !== null) {
                return useProxy(target[key], callback)
            }
            return target[key]
        },
        set(target, key, value) {
            target[key] = value
            callback(target, key, value)
            return true
        }
    })
}