package appChargeUtil

import (
	"errors"
	"fmt"

	"goutil/webUtil"
)

const (
	con_SandBoxUrl    = "https://sandbox.itunes.apple.com/verifyReceipt"
	con_ProductionUrl = "https://buy.itunes.apple.com/verifyReceipt"
)

var (
	NetworkError = errors.New("NetWorkError")
)

// 验证充值是否有效
// bundleIdentifierList：配置的BundleIdentifier列表
// productId：输入的ProductId
// receiptData：订单数据
// isSandBox：是否为沙盒模式
// 返回值：
// 充值收据对象
// 是否有效
// 错误对象（如果err==NetWorkError,则表明为网络错误）
func ValidateCharge(bundleIdentifierList []string, productId, receiptData string, isSandBox bool) (receiptObj *Receipt, isValid bool, err error) {
	// 判断参数是否为空
	if len(bundleIdentifierList) == 0 || productId == "" || receiptData == "" {
		return
	}

	// 获取Receipt对象
	receiptObj, err = getReceipt(receiptData, isSandBox)
	if err != nil {
		return
	}

	if receiptObj.IsBundleIdentifierValid(bundleIdentifierList) == false {
		return
	}

	if receiptObj.IsProductIdValid(productId) == false {
		return
	}

	isValid = true

	return
}

func getReceipt(receiptData string, isSandBox bool) (receiptObj *Receipt, err error) {
	weburl := con_ProductionUrl
	if isSandBox {
		weburl = con_SandBoxUrl
	}

	data := []byte(convertReceiptToPost(receiptData))
	statusCode, returnBytes, err := webUtil.PostByteData2(weburl, data, webUtil.GetFormHeader(), nil)
	if err != nil {
		err = NetworkError
		return
	}
	if statusCode != 200 {
		err = fmt.Errorf("StatusCode is wrong:%d", statusCode)
		return
	}

	if len(returnBytes) == 0 {
		err = fmt.Errorf("返回的数据为空")
		return
	}

	receiptObj, err = newReceipt(string(returnBytes))

	return
}

func convertReceiptToPost(receiptData string) string {
	return fmt.Sprintf("{\"receipt-data\":\"%s\"}", receiptData)
}