/**
 * 名称：适配react-native-router-flux 风格Actions
 * 作者：Beven
 * 日期：2016-11-14
 * 描述：提供api方式进行页面路由跳转
 */

//>>引入依赖
import Scene from "./Scene";
import { browserHistory } from "react-router";
import Utils from "./utils";

let _router = null;

class Actions {

    /**
     * Actions构造函数
     */
    constructor() {
        this.create = this.create.bind(this);
        this.iterate = this.iterate.bind(this);
        this.pop = this.pop.bind(this);
        this.refresh = this.refresh.bind(this);
        this.focus = this.focus.bind(this);
    }

    /**
     * 获取router对象
     */
    get router(){
        return _router;
    }

    /**
     * 设置router对象
     */
    set router(value){
        _router = value;
    }

    /**
     * 创建一组路由
     * @param scenes {Scene} 根路由
     */
    create(scenes) {
        this.iterate(scenes);
        return scenes;
    }

    /**
     * 依次遍历所有创建的route,并且使用search进行递归创建scene对应api函数
     * @param root {Scene} 根scene
     */
    iterate(root) {
        this.root = root;
        this.assert(root.props, 'props should be defined for stack');
        this.build(root);
        this.search(root);
    }

    /**
     * 递遍历指定scene路由
     * @param scene {Scene} 路由
     * @param parentKey {String} 当前路由的所有父路由组合名称
     * @param parentUrl {String} 当前节点的所有父路由组合url
     */
    search(scene, parentKey, parentUrl) {
        let path = scene.props.path;
        let children = scene.props.children;
        if (!children || Object.prototype.toString.call(children) != "[object Array]") {
            return;
        }
        parentUrl = parentUrl != null ? parentUrl + "/" + path : path;
        parentKey = Utils.nameJoin(parentKey, parentKey != null ? scene.key : "");
        for (let child of children) {
            this.build(child, parentKey, parentUrl);
            this.search(child, parentKey, parentUrl);
        }
    }

    /**
     * 生成scene对应的api函数
     * @param scene {Scene} 路由
     * @param parentKey {String} 当前路由的所有父路由组合名称
     * @param parentUrl {String} 当前节点的所有父路由组合url
     */
    build(scene, parentKey, parentUrl) {
        let props = scene.props;
        let key = scene.key;
        let url = (parentUrl + "/" + scene.props.path).replace(/\/\//g, "/");
        if (!this.isEmpty(key) && (props.component||props.getComponent)) {
            key = Utils.nameJoin(key, parentKey);
            this[key] = (props = {}) => {
                return this.go(url, props);
            }
        }
    }

    current() {
        if (global.location) {
            return global.location.href;
        }
    }

    /**
     * 跳转到指定url
     * @param url {String} url地址
     * @param props {Object} 属性参数
     */
    go(url, props = {}) {
        let absUrl = Utils.param(url, props);
        this.router.push(absUrl)
    }

    popTo(props = {}) {

    }

    pop(num) {
        browserHistory.goBack();
    }

    jump(props = {}) {
        browserHistory.go(props);
    }

    refresh(props = {}) {
        if (global.location) {
            return global.location.reload();
        }
    }

    focus(props = {}) {

    }

    assert(v, message) {
        if (this.isEmpty(v)) {
            throw new Error(message);
        }
    }

    isEmpty(v) {
        return (v == null || v == undefined || v.toString().replace(/\s/g, '') == '');
    }
}

export default new Actions();