/*
 * @Author: Rindy
 * @Date: 2021-08-13 12:00:10
 * @LastEditors: Rindy
 * @LastEditTime: 2021-08-13 15:32:02
 * @Description: 兼容jQuery.Deferred :(
 */

const noop = function () {}

Promise.prototype.done = Promise.prototype.then
Promise.prototype.fail = Promise.prototype.catch

class Deferred {
    constructor() {
        this._resolve = []
        this._reject = noop
        this._notify = noop
        this._progress = noop
        this._state = 'pending'
    }
    state() {
        return this._state
    }
    done(resolve) {
        this._resolve.push(resolve)
        return this
    }
    fail(reject) {
        this._reject = reject
        return this
    }
    then(resolve) {
        this._resolve.push(resolve)
        return this
    }
    catch(reject) {
        this._reject = reject
        return this
    }
    notify(...args) {
        this._notify = [...args]
        if (typeof this._progress == 'function') {
            this._progress.apply(null, this._notify)
        }
        return this
    }
    when(...args) {
        Promise.all([...args])
            .then((...args) => {
                this._state = 'resolve'
                this._resolve.forEach(item => item(...args))
            })
            .catch((...args) => {
                this._state = 'reject'
                this._reject(...args)
            })
    }
    progress(callback) {
        this._progress = callback
        return this
    }
    resolve(result) {
        this._state = 'resolve'
        return Promise.resolve().then(() => this._resolve.forEach(item => item(result)))
    }
    reject(result) {
        this._state = 'reject'
        return Promise.reject().catch(() => this._reject(result))
    }
    promise() {
        return this
    }
}

export default function () {
    return new Deferred()
}