import { WXApi, WXApiDelegate, BaseReq, PayReq, PayResp } from "WechatOpenSDK";
import { UTSiOSHookProxy } from "DCloudUniappRuntime";
import { UIApplication } from "UIKit";
import { URL, NSUserActivity } from "Foundation";

const defaultErrorCode : number = 700716

const errorCodeMap : Map<number, number> = new Map([
	[-1, 700711],
	[-2, 700713]
])

export class Wxpay implements UTSiOSHookProxy, WXApiDelegate {

	options ?: RequestPaymentOptions

	// 应用正常启动时 (不包括已在后台转到前台的情况)的回调函数。
	applicationDidFinishLaunchingWithOptions(application : UIApplication | null, launchOptions : Map<UIApplication.LaunchOptionsKey, any> | null = null) : boolean {
		WXApi.registerApp('wxd930ea5d5a258f4f', universalLink = 'YourUniversionLink')
		return false
	}

	// 通过 url scheme 方式唤起 app 时的回调函数。
	applicationOpenURLOptions(app : UIApplication | null, url : URL, options : Map<UIApplication.OpenURLOptionsKey, any> | null = null) : boolean {

		WXApi.handleOpen(url, delegate = this)
		return true
	}

	// 当应用程序接收到与用户活动相关的数据时调用此方法，例如，当用户使用 Universal Link 唤起应用时。
	applicationContinueUserActivityRestorationHandler(application : UIApplication | null, userActivity : NSUserActivity | null, restorationHandler : ((res : [any] | null) => void) | null = null) : boolean {
		if (userActivity != null) {
			WXApi.handleOpenUniversalLink(userActivity!, delegate = this)
		}
		
		return true
	}

	//@brief 收到一个来自微信的请求，第三方应用程序处理完后调用sendResp向微信发送结果
	onReq(req : BaseReq) {
		//TODO
	}

	//@brief 发送一个sendReq后，收到微信的回应
	onResp(resp : BaseReq) {
		const payResp :PayResp | null = resp as PayResp
		if (payResp != null) {
			if (payResp!.errCode == 0) {
				let res : RequestPaymentSuccess = {
					data: payResp!
				}
				this.options?.success?.(res)
				this.options?.complete?.(res)
			} else {
				const errCode = payResp!.errCode as number
				let code = errorCodeMap[errCode];
				if (code == null) {
					code = defaultErrorCode
				}
				let err = new RequestPaymentFailImpl(code!);
				this.options?.fail?.(err)
				this.options?.complete?.(err)
			}
		}
	}

	requestPayment(options : RequestPaymentOptions) {
		this.options = options
		
		if (this.isWXAppInstalled() == true) {
			let err = new RequestPaymentFailImpl(defaultErrorCode);
			options.fail?.(err)
			options.complete?.(err)
			return
		}

		const params = JSON.parse(options.orderInfo) as UTSJSONObject
		const partnerId = params.getString("partnerid")
		const prepayId = params.getString("prepayid")
		const packageV = params.getString("package")
		const nonceStr = params.getString("noncestr")
		const timeStamp = params.getNumber("timestamp")
		const sign = params.getString("sign")

		let request = new PayReq();
		if (partnerId != null) {
			request.partnerId = partnerId!
		}
		if (prepayId != null) {
			request.prepayId = prepayId!
		}
		if (packageV != null) {
			request.package = packageV!
		}
		if (nonceStr != null) {
			request.nonceStr = nonceStr!
		}
		if (timeStamp != null) {
			request.timeStamp = timeStamp!.toUInt32()
		}
		if (sign != null) {
			request.sign = sign!
		}
		
		//函数调用后，会切换到微信的界面。第三方应用程序等待微信返回onResp。微信在异步处理完成后一定会调用onResp
		WXApi.send(request);
	}
	
	//@brief 检查微信是否已被用户安装
	isWXAppInstalled() : boolean {
		return WXApi.isWXAppInstalled()
	}
}