// Package httpclient ...
//
// Description : httpclient ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2024-05-31 15:22
package httpclient

import (
	"fmt"
	"git.zhangdeman.cn/gateway/httpclient/cache"
	"git.zhangdeman.cn/gateway/httpclient/define"
	"git.zhangdeman.cn/gateway/httpclient/validate"
	"git.zhangdeman.cn/zhangdeman/serialize"
	"github.com/go-resty/resty/v2"
	"github.com/tidwall/gjson"
	"net/http"
	"strings"
	"time"
)

// NewHttpClient 获取http client
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:27 2024/5/31
func NewHttpClient(reqConfig *define.Request, cacheInstance cache.ICache) (*HttpClient, error) {
	// 验证配置正确性以及初始化默认值
	if err := validate.RequestConfig(reqConfig); nil != err {
		return nil, err
	}
	restyClient, restyRequest := NewRestyClient(reqConfig)
	hc := &HttpClient{
		Client:                   restyClient,
		request:                  restyRequest,
		reqConfig:                reqConfig,
		http4xxHandler:           make([]define.Http4xxHandler, 0),
		http5xxHandler:           make([]define.Http5xxHandler, 0),
		httpBusinessErrorHandler: make([]define.HttpBusinessErrorHandler, 0),
		requestFinishHandler:     make([]define.RequestFinishHandler, 0),
		cacheInstance:            cacheInstance,
	}
	return hc, nil
}

// HttpClient 请求客户端
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:27 2024/5/31
type HttpClient struct {
	*resty.Client
	request                  *resty.Request
	reqConfig                *define.Request
	http4xxHandler           []define.Http4xxHandler
	http5xxHandler           []define.Http5xxHandler
	httpBusinessErrorHandler []define.HttpBusinessErrorHandler
	requestSendErrorHandler  []define.RequestSendErrorHandler
	requestFinishHandler     []define.RequestFinishHandler
	cacheInstance            cache.ICache
}

// OnResponse4xx 4xx处理逻辑
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:20 2024/6/1
func (hc *HttpClient) OnResponse4xx(handlerList ...define.Http4xxHandler) {
	hc.http4xxHandler = append(hc.http4xxHandler, handlerList...)
}

// OnResponse5xx 5xx处理逻辑
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:21 2024/6/1
func (hc *HttpClient) OnResponse5xx(handlerList ...define.Http5xxHandler) {
	hc.http5xxHandler = append(hc.http5xxHandler, handlerList...)
}

// OnResponseBusinessError 业务错误出路逻辑
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:22 2024/6/1
func (hc *HttpClient) OnResponseBusinessError(handlerList ...define.HttpBusinessErrorHandler) {
	hc.httpBusinessErrorHandler = append(hc.httpBusinessErrorHandler, handlerList...)
}

// OnRequestFinish 请求完成时间
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:36 2024/6/1
func (hc *HttpClient) OnRequestFinish(handlerList ...define.RequestFinishHandler) {
	hc.requestFinishHandler = append(hc.requestFinishHandler, handlerList...)
}

// getRequestValidateMiddleware 请求验证的Middleware
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:40 2024/5/31
func (hc *HttpClient) getRequestValidateMiddleware() resty.RequestMiddleware {
	return func(client *resty.Client, request *resty.Request) error {
		return nil
	}
}

// getResponseValidateMiddleware 获取相应数据验证的middleware
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:42 2024/5/31
func (hc *HttpClient) getResponseValidateMiddleware() resty.ResponseMiddleware {
	return func(client *resty.Client, response *resty.Response) error {
		return nil
	}
}

// SetRestyClient 设置client
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:54 2024/5/31
func (hc *HttpClient) SetRestyClient(restyClient *resty.Client) {
	hc.Client = restyClient
}

// GetRestyClient 获取 resty client
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:57 2024/5/31
func (hc *HttpClient) GetRestyClient() *resty.Client {
	return hc.Client
}

// Request 发送请求
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:52 2024/5/31
func (hc *HttpClient) Request() *define.Response {
	var (
		cacheResult *define.Response
	)

	if cacheResult = hc.getCacheResult(); nil != cacheResult {
		// 判断是否开启预热
		inputCachePreHeatConfig := hc.cacheInstance.PreHeatConfig()
		var cachePreHeatConfig define.CachePreHeatConfig
		serialize.JSON.TransitionIgnoreError(inputCachePreHeatConfig, &cachePreHeatConfig)
		if !cachePreHeatConfig.Enable || (cachePreHeatConfig.MinTTL <= 0 && cachePreHeatConfig.MinPercent <= 0 && !cachePreHeatConfig.Force) {
			// 无预热配置或未启用预热或者未设置预热规则
			return cacheResult
		}
		go func() {
			// 判断是否触发预热
			if cachePreHeatConfig.Force {
				_ = hc.requestBackendApi()
				return
			}
			// 将百分比的配置归一化成最小剩余时间的配置
			if cachePreHeatConfig.MinPercent > 0 {
				expectMinTTL := hc.cacheInstance.CacheTime() * cachePreHeatConfig.MinPercent / 100
				if cachePreHeatConfig.MinTTL == 0 || cachePreHeatConfig.MinTTL > expectMinTTL {
					cachePreHeatConfig.MinTTL = expectMinTTL
				}
			}
			if cachePreHeatConfig.MinTTL <= 0 {
				// 未配置最小剩余时间
				return
			}
			ttl := hc.cacheInstance.TTL(cacheResult.CacheInfo.CacheKey)
			if ttl < 0 {
				// 不存在或者未设置有效期
				return
			}

			if ttl <= cachePreHeatConfig.MinTTL {
				// 配置了最小剩余时间,并且key剩余有效期小于最小剩余时间
				_ = hc.requestBackendApi()
			}
		}()
	}

	return hc.requestBackendApi()

}

// requestBackendApi 请求后端接口
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:47 2024/10/9
func (hc *HttpClient) requestBackendApi() *define.Response {
	hc.Client.OnBeforeRequest(hc.getRequestValidateMiddleware())  // 请求参数验证中间件必注册
	hc.Client.OnAfterResponse(hc.getResponseValidateMiddleware()) // 响应验证中间件必注册
	var (
		err error
	)

	response := hc.newResponse()
	for i := 0; i < hc.reqConfig.RetryRule.RetryCount+1; i++ {
		response.Seq++
		response.RequestCount++
		if response.RestyResponse, err = hc.request.Send(); nil != err {
			response.FailInfo = &define.ResponseFailInfo{
				Type:    define.RequestFailTypeSend,
				Message: "response instance is nil",
			}
			for _, itemAfterResponse := range hc.requestFinishHandler {
				itemAfterResponse(hc.reqConfig, response)
			}
			time.Sleep(time.Duration(hc.reqConfig.RetryRule.RetryTimeInterval) * time.Millisecond)
			continue
		}

		if nil == response.RestyResponse {
			response.FailInfo = &define.ResponseFailInfo{
				Type:    define.RequestFailTypeSend,
				Message: "response instance is nil",
			}
			for _, itemAfterResponse := range hc.requestFinishHandler {
				itemAfterResponse(hc.reqConfig, response)
			}
			time.Sleep(time.Duration(hc.reqConfig.RetryRule.RetryTimeInterval) * time.Millisecond)
			continue
		}
		// 解析返回信息
		hc.fillResponseHeader(response)
		hc.fillResponseCookie(response)
		hc.fillResponseBody(response)
		if response.HttpCode != http.StatusOK {
			response.FailInfo = &define.ResponseFailInfo{
				Type:    define.RequestFailTypeServerError,
				Message: "http code is " + response.HttpCodeStatus + ", not success",
			}
			time.Sleep(time.Duration(hc.reqConfig.RetryRule.RetryTimeInterval) * time.Millisecond)
			continue
		}
		if !hc.isCodeSuccess(response) {
			response.FailInfo = &define.ResponseFailInfo{
				Type:    define.RequestFailTypeBusinessError,
				Message: "business code is " + response.Code + ", not success",
			}
			time.Sleep(time.Duration(hc.reqConfig.RetryRule.RetryTimeInterval) * time.Millisecond)
			continue
		}
		response.IsSuccess = true                                                                //设置成功
		response.CacheInfo.SetCache, response.CacheInfo.CacheError = hc.setCacheResult(response) // 设置缓存
		break
	}

	return response
}

// newResponse 默认返回数据
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:44 2024/6/1
func (hc *HttpClient) newResponse() *define.Response {
	return &define.Response{
		Header:            map[string]string{},
		Cookie:            map[string]string{},
		Body:              map[string]any{},
		Code:              "",
		Message:           "",
		Data:              "",
		HttpCode:          0,
		HttpCodeStatus:    "",
		ResponseDataRule:  nil,
		Seq:               0,
		RequestStartTime:  0,
		RequestFinishTime: 0,
		UsedTime:          0,
		RestyResponse:     nil,
		IsSuccess:         false,
		CacheInfo: &define.ResponseCacheInfo{
			IsCache:     false,
			SetCache:    false,
			CacheKey:    "",
			CacheValue:  "",
			CacheEnable: nil != hc.cacheInstance && hc.cacheInstance.Enable(),
			CacheError:  nil,
		},
		RequestCount: 0,
		FailInfo:     nil,
	}
}

// fillResponseHeader 填充响应header
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:30 2024/6/5
func (hc *HttpClient) fillResponseHeader(response *define.Response) {
	response.Header = map[string]string{}                     // 清空已有数据
	response.HttpCode = response.RestyResponse.StatusCode()   // http状态码
	response.HttpCodeStatus = response.RestyResponse.Status() // http状态码描述
	for headerName, headerValue := range response.RestyResponse.Header() {
		if len(headerValue) > 0 {
			response.Header[headerName] = headerValue[0]
		} else {
			response.Header[headerName] = ""
		}
	}
}

// fillResponseCookie 填充cookie
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:32 2024/6/5
func (hc *HttpClient) fillResponseCookie(response *define.Response) {
	response.Cookie = map[string]string{} // 清空已有数据
	for _, cookieValue := range response.RestyResponse.Cookies() {
		response.Cookie[cookieValue.Name] = cookieValue.Value
	}
}

// fillResponseBody 填充响应body
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:38 2024/6/5
func (hc *HttpClient) fillResponseBody(response *define.Response) {
	response.Data = string(response.RestyResponse.Body())
	response.Code = gjson.Get(response.Data, hc.reqConfig.CodeField).String()
	response.Message = gjson.Get(response.Data, hc.reqConfig.MessageField).String()
	businessData := gjson.Get(response.Data, hc.reqConfig.DataField)
	if businessData.Value() == nil {
		// data为空指针, 归一化成空对象
		response.Body = map[string]any{}
	} else {
		if businessData.IsArray() {
			// 数组类型的转换
			response.Data = fmt.Sprintf(`{"list":` + businessData.String() + "}")
		} else {
			if businessData.IsObject() {
				// 返回的就是对象
				response.Data = businessData.String()
			} else {
				// 返回是普通类型
				response.Data = serialize.JSON.MarshalForStringIgnoreError(map[string]any{
					"value": businessData.Value(),
				})
			}
		}
		_ = serialize.JSON.UnmarshalWithNumber([]byte(response.Data), &response.Body)
	}

	response.ExtendData = map[string]string{}
	gjson.Parse(response.Data).ForEach(func(key, value gjson.Result) bool {
		if key.String() == hc.reqConfig.CodeField ||
			key.String() == hc.reqConfig.MessageField ||
			key.String() == hc.reqConfig.DataField {
			return true
		}
		response.ExtendData[key.String()] = value.String()
		return true
	})
}

// isHttpCodeSuccess ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 22:48 2024/6/6
func (hc *HttpClient) isCodeSuccess(response *define.Response) bool {
	for _, itemSuccessCode := range hc.reqConfig.SuccessCodeList {
		if itemSuccessCode == response.Code {
			return true
		}
	}
	return false
}

// getCacheResult 获取缓存结果
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 16:04 2024/6/3
func (hc *HttpClient) getCacheResult() *define.Response {
	if nil == hc.cacheInstance || !hc.cacheInstance.Enable() {
		return nil
	}
	startTime := time.Now().UnixMilli()
	cacheKey := hc.cacheInstance.GetKey(hc.reqConfig)
	cacheValue := strings.TrimSpace(hc.cacheInstance.GetValue(cacheKey))
	if len(cacheValue) == 0 {
		return nil
	}
	response := hc.newResponse()
	if err := serialize.JSON.UnmarshalWithNumber([]byte(cacheValue), response); nil != err {
		return nil
	}
	response.CacheInfo.IsCache = true                                          // 设置缓存标记
	response.RequestStartTime = startTime                                      // 开始时间
	response.RequestFinishTime = time.Now().UnixMilli()                        // 结束时间
	response.UsedTime = response.RequestFinishTime - response.RequestStartTime // 耗时
	response.CacheInfo.CacheKey = cacheKey                                     // 缓存key
	response.CacheInfo.CacheValue = cacheValue                                 // 缓存值
	return response
}

// setCacheResult ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 16:24 2024/6/3
func (hc *HttpClient) setCacheResult(response *define.Response) (bool, error) {
	if nil == response || nil == hc.cacheInstance {
		return false, nil
	}
	// 全局未开启或者当前请求不支持缓存
	if !hc.cacheInstance.Enable() || !hc.cacheInstance.IsAllow(hc.reqConfig, response) {
		return false, nil
	}
	cacheKey := hc.cacheInstance.GetKey(hc.reqConfig)
	cacheValue := serialize.JSON.MarshalForStringIgnoreError(response)
	if err := hc.cacheInstance.SetValue(cacheKey, cacheValue); nil != err {
		return false, err
	}
	response.CacheInfo.CacheKey = cacheKey
	response.CacheInfo.CacheValue = cacheValue
	return true, nil
}