// Package httpclient ...
//
// Author: go_developer@163.com<白茶清欢>
//
// Description:
//
// File: request.go
//
// Version: 1.0.0
//
// Date: 2022/05/01 21:25:03
package httpclient

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
	"time"

	"git.zhangdeman.cn/zhangdeman/exception"

	"github.com/tidwall/gjson"

	"github.com/ddliu/go-httpclient"
)

// Request 发送请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:26:02
func Request(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = strings.ToUpper(apiConfig.Method)
	switch apiConfig.Method {
	case http.MethodGet:
		return GET(apiConfig, header, param)
	case http.MethodPost:
		return POST(apiConfig, header, param)
	case http.MethodPut:
		return PUT(apiConfig, header, param)
	case http.MethodDelete:
		return DELETE(apiConfig, header, param)
	case http.MethodConnect:
		return Connect(apiConfig, header, param)
	case http.MethodOptions:
		return OPTION(apiConfig, header, param)
	case http.MethodTrace:
		return Trace(apiConfig, header, param)
	case http.MethodPatch:
		return Patch(apiConfig, header, param)
	default:
		return &ApiResponse{
			RequestConfig:     apiConfig,
			Exception:         exception.New(RequestMethodNotSupport, 0, map[string]string{"method": apiConfig.Method}, apiConfig.Method+" : request method is not support"),
			Response:          nil,
			StartRequestTime:  time.Now().UnixNano(),
			FinishRequestTime: time.Now().UnixNano(),
		}
	}
}

// GET ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date: 2022/05/01 21:29:09
func GET(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodGet
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// POST post请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:31:36
func POST(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodPost
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// PUT put请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:31:52
func PUT(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodPut
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// DELETE delete请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:32:08
func DELETE(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodDelete
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// OPTION option请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:32:18
func OPTION(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodOptions
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// Patch patch请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:36:12
func Patch(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodPatch
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// Trace trace请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:36:24
func Trace(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodTrace
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// Connect connect请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022/05/01 21:36:39
func Connect(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) *ApiResponse {
	apiConfig.Method = http.MethodConnect
	buildRequestURLAndParam(apiConfig, header, param)
	return send(apiConfig, header)
}

// getHttpClient 获取httpclient实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 22:27 2022/5/1
func getHttpClient(apiConfig *ApiRequestConfig, header map[string]string) *httpclient.HttpClient {
	fullHeader := make(map[string]string)
	for name, val := range apiConfig.CommonHeader {
		fullHeader[name] = val
	}
	for name, val := range header {
		fullHeader[name] = val
	}
	if len(apiConfig.ContentType) == 0 {
		apiConfig.ContentType = ContentTypeDefault
	}
	fullHeader["content-type"] = apiConfig.ContentType
	return httpclient.NewHttpClient().WithHeaders(fullHeader).
		WithOption(httpclient.OPT_CONNECTTIMEOUT_MS, apiConfig.Timeout.Connect).
		WithOption(httpclient.OPT_TIMEOUT_MS, apiConfig.Timeout.Read)
}

// buildRequestURLAndParam 构建完整请求URL与请求参数
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:55 2022/5/1
func buildRequestURLAndParam(apiConfig *ApiRequestConfig, header map[string]string, param map[string]interface{}) {
	apiConfig.Method = strings.ToUpper(apiConfig.Method)
	if apiConfig.Timeout.Connect == 0 {
		apiConfig.Timeout.Connect = DefaultConnectTimeout
	}
	if apiConfig.Timeout.Read == 0 {
		apiConfig.Timeout.Read = DefaultConnectTimeout
	}
	formatParam := make(map[string]interface{})
	for paramName, paramValue := range param {
		uriTemplate := "{" + paramName + "}"
		if strings.Contains(apiConfig.URI, uriTemplate) {
			apiConfig.URI = strings.ReplaceAll(apiConfig.URI, uriTemplate, fmt.Sprintf("%v", paramValue))
			continue
		}
		formatParam[paramName] = paramValue
	}
	apiConfig.Parameter = formatParam
	paramPair := make([]string, 0)
	switch apiConfig.Method {
	case http.MethodPost:
		apiConfig.Body, _ = json.Marshal(formatParam)
	default:
		for paramName, paramValue := range formatParam {
			paramPair = append(paramPair, fmt.Sprintf("%v=%v", paramName, paramValue))
		}
		if len(paramPair) > 0 {
			apiConfig.URI = apiConfig.URI + "?" + strings.Join(paramPair, "&")
		}
	}
	if strings.HasSuffix(apiConfig.Domain, "/") {
		apiConfig.Domain = strings.TrimRight(apiConfig.Domain, "/")
	}
	if !strings.HasPrefix(apiConfig.URI, "/") {
		apiConfig.URI = "/" + apiConfig.URI
	}
	apiConfig.FullURL = apiConfig.Domain + apiConfig.URI
}

// send 发送请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:53 2022/5/2
func send(apiConfig *ApiRequestConfig, header map[string]string) *ApiResponse {
	var (
		client       *httpclient.HttpClient
		err          error
		responseByte []byte
	)

	// 填充默认配置
	if len(apiConfig.ResponseCodeFieldLocation) == 0 {
		apiConfig.ResponseCodeFieldLocation = ResponseCodeFieldLocationDefault
	}
	if len(apiConfig.ResponseCodeField) == 0 {
		apiConfig.ResponseCodeField = DefaultResponseCodeField
	}
	if len(apiConfig.ResponseMessageField) == 0 {
		apiConfig.ResponseMessageField = DefaultResponseMessageField
	}
	if len(apiConfig.ResponseDataField) == 0 {
		apiConfig.ResponseDataField = DefaultResponseDataField
	}
	if len(apiConfig.SuccessCodeList) == 0 {
		apiConfig.SuccessCodeList = DefaultSuccessCode
	}
	if len(apiConfig.SuccessHttpCodeList) == 0 {
		apiConfig.SuccessHttpCodeList = DefaultSuccessHttpCode
	}

	response := &ApiResponse{
		RequestConfig:     apiConfig,
		Response:          nil,
		Exception:         nil,
		StartRequestTime:  time.Now().UnixNano(),
		FinishRequestTime: 0,
		Code:              "",
		Message:           "",
		Data:              "",
	}

	defer func() {
		response.FinishRequestTime = time.Now().UnixNano()
	}()

	client = getHttpClient(apiConfig, header)
	if response.Response, err = client.Do(apiConfig.Method, apiConfig.FullURL, nil, bytes.NewReader(apiConfig.Body)); nil != err {
		response.Exception = exception.New(SendRequestError, 0, map[string]string{"real_reason": err.Error()}, "http request send fail : "+err.Error())
		return response
	}
	if responseByte, err = io.ReadAll(response.Response.Body); nil != err {
		response.Exception = exception.New(ReadResponseBodyError, response.Response.StatusCode, map[string]string{"real_reason": err.Error()}, "response body read fail : "+err.Error())
		return response
	}
	// 判断http状态码是否为成功
	isHttpSuccess := false
	responseHttpCode := fmt.Sprintf("%v", response.Response.StatusCode)
	for _, itemSuccessHttpCode := range response.RequestConfig.SuccessHttpCodeList {
		if responseHttpCode == itemSuccessHttpCode {
			isHttpSuccess = true
			break
		}
	}
	// http请求失败
	if !isHttpSuccess {
		response.Exception = exception.New(ResponseHttpCodeIsNotSuccess, response.Response.StatusCode, map[string]string{
			"real_reason": responseHttpCode + " : response http code is not success",
		}, responseHttpCode+" : response http code is not success")
		return response
	}
	// 提取响应错误码
	if response.RequestConfig.ResponseCodeFieldLocation == ResponseCodeFieldLocationHeader {
		response.Code = response.Response.Header.Get(response.RequestConfig.ResponseCodeField)
	} else {
		businessCode := gjson.GetBytes(responseByte, response.RequestConfig.ResponseCodeField)
		if businessCode.Exists() {
			response.Code = businessCode.String()
		}
	}

	// 判断是否提取到响应状态码
	if len(response.Code) == 0 {
		response.Exception = exception.New(ResponseCodeNotFound, response.Response.StatusCode, map[string]string{
			"real_reason": "parse response business code fail",
		}, fmt.Sprintf("business code location : %v, business code name : %v, parse business code fail", response.RequestConfig.ResponseCodeFieldLocation, response.RequestConfig.ResponseCodeField))
	}
	// 提取响应文案
	response.Message = gjson.GetBytes(responseByte, response.RequestConfig.ResponseMessageField).String()
	if len(response.Message) == 0 {
		response.Message = DefaultMessage
	}

	// 判断响应状态码是否成功
	isBusinessCodeSuccess := false
	for _, itemSuccessCode := range response.RequestConfig.SuccessHttpCodeList {
		if itemSuccessCode == response.Code {
			isBusinessCodeSuccess = true
			break
		}
	}

	if !isBusinessCodeSuccess {
		response.Exception = exception.New(ResponseCodeNotFound, response.Response.StatusCode, map[string]string{}, response.Message)
		return response
	}

	// 提取响应数据
	if response.RequestConfig.ResponseDataField == ResponseBodyAsData {
		response.Data = string(responseByte)
	} else {
		responseData := gjson.GetBytes(responseByte, response.RequestConfig.ResponseDataField)
		if !responseData.Exists() {
			response.Exception = exception.New(ResponseDataNotFound, response.Response.StatusCode, map[string]string{}, "response data not found, data field name : "+response.RequestConfig.ResponseDataField)
			return response
		}
		response.Data = responseData.String()
	}

	return response
}