import { _decorator, Component, Enum, EventHandler } from 'cc';
import { Log } from '../utils/Log';
import { RC4 } from '../utils/RC4';
import { HttpSystem, HostData, ErrorDataType } from './HttpSystem';
import { HttpRequest } from './HttpRequest';
const { ccclass, property, executionOrder } = _decorator;
/**
 * Http请求方法
 */
export enum HttpMethod {
    GET = "get",
    POST = "post"
}
/**
 * Http请求的数据类型
 */
export enum ResponseType {
    Arraybuffer,
    Blob,
    Document,
    Json,
    Text
}
export enum HttpResponseCode {
    /**
     * 成功
     */
    Success,
    /**
     * 没有登录
     */
    NoLogin,
    /**
     * 未知错误
     */
    UnKnowError,
    /**
     * 密钥错误
     */
    KeyError
}
/**
 * Http组件
 * @description 建议使用@requireComponent(Http)、this.getComponent(Http)来配合使用Http组件
 * @description post模式暂时还不支持消息加密
 * @author 袁浩
 */
@ccclass('Http')
@executionOrder(-1)
export class Http extends Component {
    @property({ tooltip: "HttpConfig中配置的服务端别名，不填则取HttpConfig中的默认值" })
    public hostAlias: string = "";
    @property({ tooltip: "请求是否应当带有授权信息，如cookie或授权header头" })
    public withCredentials: boolean = false;
    @property({ tooltip: "该请求的超时时间（毫秒），0为20秒", step: 1, min: 0 })
    public timeout: number = 0;
    @property({ type: Enum(ResponseType), tooltip: "返回的数据格式" })
    public responseType: ResponseType = ResponseType.Json;
    @property({ type: EventHandler, tooltip: "加载的进度回调函数" })
    public onProgress: EventHandler;
    @property({ tooltip: "消息加密" })
    public useEncrypt: boolean = true;
    @property({ tooltip: "是否打印消息" })
    public useLog: boolean = true;
    /**
     * 收到数据后的公共回调，返回值为是否执行后续调用
     */
    public static onData: (data: any) => boolean = () => { return true; }
    /**
     * 密钥错误
     */
    public static onKeyError: () => void = () => { }
    private get config(): HostData {
        return HttpSystem.getConfig(this.hostAlias);
    }
    public getRootURL(): string {
        var port = `:${this.config.port}`;
        if (this.config.SSL && this.config.port == 443 || !this.config.SSL && this.config.port == 80) {
            port = '';
        }
        return `${this.config.SSL ? "https://" : "http://"}${this.config.host}${port}`;
    }
    private headerObj: any;
    /**
     * 给指定的HTTP请求头赋值.在这之前,您必须确认已经调用 open() 方法打开了一个url.
     * @param header 将要被赋值的请求头名称.
     * @param value 给指定的请求头赋的值.
     */
    public setRequestHeader(header: string, value: string): void {
        if (!this.headerObj) {
            this.headerObj = {};
        }
        this.headerObj[header] = value;
    }
    /**
     * 所有的请求数据
     */
    protected requestMap: any = {};
    /**
     * 发送请求
     * @param path 路径
     * @param data 数据
     * @param method 方法
     * @returns 
     */
    public async send(path: string, data: any = {}, method: HttpMethod = HttpMethod.GET, useEncrypt?: boolean, useTail = true) {
        let result = await this._send(path, data, method, useEncrypt, useTail);
        if (result && result.code == HttpResponseCode.KeyError) {
            HttpSystem.resetPublicKey();
            result = await this._send(path, data, method, useEncrypt, useTail);
            if (result && result.code == HttpResponseCode.KeyError) {//续签密钥失败
                Http.onKeyError();
                return { code: HttpResponseCode.KeyError, data: HttpSystem.getErrorDataType() != ErrorDataType.Null ? {} : null };
            }
        }
        return result;
    }
    private _send(path: string, data: any = {}, method: HttpMethod = HttpMethod.GET, useEncrypt?: boolean, useTail = true) {
        return new Promise<any>((resolve: (data: any) => void, reject) => {
            if (useEncrypt === undefined) {
                useEncrypt = this.useEncrypt;
            }
            var self = this;
            var request = new HttpRequest((url: string) => {
                if (!this.isValid) {
                    return;
                }
                console.error(`http请求[${url}]失败`);
                delete self.requestMap[url];
                var errorDataType = HttpSystem.getErrorDataType();
                if (errorDataType == ErrorDataType.Throw) {
                    reject();
                }
                else {
                    resolve(errorDataType == ErrorDataType.Null ? null : {});
                }
            }, (httpRequest: HttpRequest) => {
                if (!this.isValid) {
                    return;
                }
                var errorDataType = HttpSystem.getErrorDataType();
                var response = httpRequest.response;
                if (!response && errorDataType == ErrorDataType.Object) {
                    response = {};
                }
                if (useEncrypt) {
                    response = HttpSystem.decrypt(response);
                    self.responseType == ResponseType.Json && (response = JSON.parse(response));
                }
                let url = httpRequest.url.substring(0, httpRequest.url.indexOf('?'));
                this.useLog && HttpSystem.useDebugLog && Log.info(`http请求[${url}]成功，数据为${self.responseType == ResponseType.Json ? JSON.stringify(response) : response}`);
                Http.onData(response) && resolve(response);
                delete self.requestMap[httpRequest.url];
            }, (loaded: number, total: number): void => {
                self.onProgress.emit([loaded, total]);
            });
            request.withCredentials = this.withCredentials;
            request.timeout = this.timeout || 20000;
            switch (this.responseType) {
                case ResponseType.Json:
                    request.responseType = "json";
                    break;
                case ResponseType.Arraybuffer:
                    request.responseType = "arraybuffer";
                    break;
                case ResponseType.Blob:
                    request.responseType = "blob";
                    break;
                case ResponseType.Document:
                    request.responseType = "document";
                    break;
                case ResponseType.Text:
                    request.responseType = "text";
                    break;
                default:
                    request.responseType = "";
                    break;
            }
            if (useEncrypt) {//如果消息加密
                data = data || {};
                data.timestamp = HttpSystem.serverTime;
            }
            let getData: string = typeof data == 'object' ? HttpSystem.dataToString(data) : data;
            let postData = method == HttpMethod.GET ? null : (typeof data == 'object' ? JSON.stringify(data) : data);
            let url: string = this.getRootURL() + (method == HttpMethod.GET ? path + "?" + getData : path);
            this.useLog && HttpSystem.useDebugLog && Log.info(`http请求[${url}]发送`);
            if (useEncrypt) {//如果消息加密
                if (method == HttpMethod.GET) {
                    getData = HttpSystem.encrypt(getData, method);
                }
                else {
                    postData = HttpSystem.encrypt(postData, method);
                }
            }
            useTail && (getData += HttpSystem.tailString);
            url = this.getRootURL() + (method == HttpMethod.GET ? path + "?" + getData : path);
            if (this.headerObj) {
                for (let key in this.headerObj) {
                    request.setRequestHeader(key, this.headerObj[key]);
                }
            }
            self.requestMap[url] = request;
            request.open(url, method);
            request.send(postData);
        });
    }
    /**
     * 撤销http请求
     * 在onDestroy中记得调用，防止页面关闭了，请求还在执行导致产生一系列错误和内存泄漏（需要详细测试，可能并不需要如此）
     * @param path {string} http请求的地址
     * @param data {any} 请求所携带的数据
     */
    public cancel(path: string): void {
        for (var key in this.requestMap) {
            if (key.indexOf(this.getRootURL() + path) == 0) {
                var request: XMLHttpRequest = this.requestMap[key];
                request.abort();
                delete this.requestMap[key];
            }
        }
    }
    /**
     * 撤销所有http请求
     */
    public cancelAll(): void {
        for (var key in this.requestMap) {
            var request: XMLHttpRequest = this.requestMap[key];
            request.abort();
        }
        this.requestMap = {};
    }
    public onDestroy() {
        this.cancelAll();
    }
}