// #ifdef H5
import { DOM } from '../component/h5-dom';
import init from '../vueRouter/init';
// #endif

import { warn } from '../helpers/warn';

class Patch {
    constructor(H5) {
        this.H5 = H5;
        this.isLoading = true;
        this.loadingCount = 0; // 在APP.vue中进行跳转时，DOMContentLoaded过慢。使用索引来判断
    }

    on(fun, args, callback) {
        if (this.H5) {
            return this[fun](args);
        }
        if (callback) {
            callback();
        }
    }

    /**
	 *把vueRouter的生命周期代理过来
	 * @param {Object} Router
	 * @param {Object} vueRouter
	 * @param {VueComponent} vueVim
	 */
    // eslint-disable-next-line
    registerHook(Router, vueRouter, vueVim) {
        init(Router, vueRouter, vueVim);
    }

    /**
	 * H5 专属 history.back API
	 * @param {Number} backLayer	需要返回的层级必须是正整数
	 * 2020年1月14日14:39:38  修复 https://github.com/SilurianYang/uni-simple-router/issues/73
	 */
    // eslint-disable-next-line
    historyBack({ backLayer, delta = { from: 'navigateBack' } } = {}) {
        const pages = getCurrentPages();
        const page = pages[pages.length - 1];
        const { onBackPress } = page.$options;
        if (onBackPress != null && onBackPress.constructor === Array) {
            const callFun = onBackPress[onBackPress.length - 1];
            const isNext = callFun.call(page, delta);
            if (isNext) {
                return true;
            }
        }
        // eslint-disable-next-line
        history.go(-backLayer);
    }

    /**
	 * 把加载动画添加到dom下面,为什么一定要先添加，后移除。保证动画的连续性
	 */
    appendHTML({
        style,
        html,
        script,
    }) {
        window.addEventListener('DOMContentLoaded', () => {
            const body = document.querySelector('body');
            body.appendChild(style);
            body.appendChild(html);
            body.appendChild(script);
            this.toogle('startLodding', true);
        });
    }

    /**
	 * 页面是否加载完毕触发对应事件
	 */
    toogle(toogle, DOMContentLoaded = false) {
        if (DOMContentLoaded && this.loadingCount !== 0) {
            this.loadingCount += 1;
            return false;
        }
        try {
            this.loadingCount += 1;
            if (this.isLoading) {
                window[toogle]();
            }
        } catch (error) {
            warn('你使用了 addRoutes API 提前进行了生命周期 并触发了startLodding');
        }
    }

    async setLoadingStatus({
        loading,
        replaceStyle,
        resetStyle,
    }) {
        this.isLoading = loading;
        if (loading) {		// 确认需要加载样式 开始插入节点
            const userStyle = resetStyle();
            const userStyleKeys = Object.keys(userStyle);
            for (let i = 0; i < userStyleKeys.length; i += 1) {
                const key = userStyleKeys[i];
                let html = userStyle[key];
                if (key === 'style' && !replaceStyle) {	// 开发者设置为追加style
                    html = DOM[key].innerHTML + html;
                }
                DOM[key].innerHTML = html;
            }
            this.appendHTML(DOM);
        }
    }
}
export default Patch;