// Package mesh ...
//
// Description : mesh ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2025-03-28 14:11
package mesh

import (
	"context"
	"fmt"
	"git.zhangdeman.cn/gateway/validate"
	"git.zhangdeman.cn/zhangdeman/consts"
	"git.zhangdeman.cn/zhangdeman/network/httpclient"
	"git.zhangdeman.cn/zhangdeman/network/httpclient/define"
	"git.zhangdeman.cn/zhangdeman/serialize"
	"strings"
	"sync"
)

func Request(req *RequestConfig, receiver any) *Response {
	if nil == req.Ctx {
		req.Ctx = context.Background()
	}
	c := &client{
		resp: &Response{
			IsSuccess:        false,
			ErrorCode:        "",
			ErrorMessage:     "",
			Raw:              nil,
			DataMap:          nil,
			AliasResultTable: make(map[string]*define.Response),
			Lock:             &sync.RWMutex{},
		},
		reqCfg:   req,
		receiver: receiver,
	}
	return c.Request()
}

type client struct {
	ctx      context.Context
	resp     *Response
	reqCfg   *RequestConfig
	receiver any
}

func (c *client) Request() *Response {
	for _, itemGroup := range c.reqCfg.Group {
		if !c.doRequest(itemGroup) {
			break
		}
	}
	if c.resp.FinalFailure {
		// 请求失败
		return c.resp
	}
	// 请求成功, 构建返回结果
	return c.resp
}

// doRequest 返回是否继续
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:30 2025/3/28
func (c *client) doRequest(apiList []*RequestConfigGroupItem) bool {
	if len(apiList) == 0 {
		return true
	}
	// 初始化请求配置, 并获取 http client 实例
	httpClientList := make([]*httpclient.HttpClient, 0)
	for _, apiCfg := range apiList {
		var (
			err        error
			httpClient *httpclient.HttpClient
			param      map[string]map[string]any
		)
		// 初始化一下请求
		c.initApiCfg(apiCfg)
		// 构造生成请求参数
		if param, err = c.buildRequestParams(apiCfg); nil != err {
			// 构造请求参数失败, 直接返回
			c.resp.ErrorCode = "-500"
			c.resp.ErrorMessage = err.Error()
			return false
		}
		apiCfg.RequestCfg.Body = param[consts.RequestDataLocationBody.String()]     // body
		apiCfg.RequestCfg.Header = param[consts.RequestDataLocationHeader.String()] // header
		apiCfg.RequestCfg.Cookie = param[consts.RequestDataLocationCookie.String()] // cookie
		apiCfg.RequestCfg.Query = param[consts.RequestDataLocationQuery.String()]   // query
		if httpClient, err = httpclient.NewHttpClient(apiCfg.RequestCfg, apiCfg.CacheInstance); nil != err {
			// 此处获取客户端实例即发生异常, 忽略一切配置, 直接作为全局失败, 后续也不请求了
			c.resp.ErrorCode = "-500"
			c.resp.ErrorMessage = err.Error()
			return false
		}
		httpClientList = append(httpClientList, httpClient)
	}
	isContinue := true
	wg := &sync.WaitGroup{}
	for idx, apiCfg := range apiList {
		wg.Add(1)
		go func(clientIdx int, apiCfg *RequestConfigGroupItem) {
			defer func() {
				if err := recover(); nil != err {

				}
				wg.Done()
			}()
			if c.resp.FinalFailure && !apiCfg.FinalFailureAllow {
				// 已经最终失败, 并且最终失败后, 当前接口已经不允许请求, 不在进行请求
				return
			}
			resp := httpClientList[clientIdx].Request()
			c.resp.Lock.Lock()
			defer c.resp.Lock.Unlock()
			if !resp.IsSuccess {
				// 判断是否已经是最终失败
				if apiCfg.FailBehavior.FinalFailure || apiCfg.FailBehavior.Action == FailBehaviorError {
					c.resp.FinalFailure = true
					// 判断是否继续, 只能阻断后续分组请求，无法阻断当前租的请求
					isContinue = FailBehaviorContinue == apiCfg.FailBehavior.Action
				}
			}
			// 记录请求的信息
			c.resp.AliasResultTable[apiCfg.Alias] = resp
		}(idx, apiCfg)
	}
	wg.Wait()
	return isContinue
}

func (c *client) initApiCfg(apiCfg *RequestConfigGroupItem) {
	if apiCfg.FailBehavior == nil {
		apiCfg.FailBehavior = &RequestConfigGroupItemFailBehavior{
			Action:       FailBehaviorError, // 默认失败终止请求
			FinalFailure: true,              // 默认一旦失败,则争个整个失败
		}
	}
	if apiCfg.FailBehavior.Action == FailBehaviorError {
		// 配置了请求失败则报错, 一定是导致结果最终失败
		apiCfg.FailBehavior.FinalFailure = true
	}
	// 每一个请求有独立的context
	apiCfg.RequestCfg.Ctx = context.WithValue(c.reqCfg.Ctx, "alias", apiCfg.Alias)
}

// buildRequestParams 构建请求参数 location => path: value
func (c *client) buildRequestParams(apiCfg *RequestConfigGroupItem) (map[string]map[string]any, error) {
	sourceData := map[string]any{}
	for aliasName, itemRes := range c.resp.AliasResultTable {
		sourceData[aliasName] = map[string]any{
			consts.ResponseDataLocationBody.String():   itemRes.Body[apiCfg.RequestCfg.DataField],
			consts.ResponseDataLocationHeader.String(): itemRes.Header,
			consts.ResponseDataLocationCookie.String(): itemRes.Cookie,
		}
	}
	sourceDataByte := serialize.JSON.MarshalForByteIgnoreError(sourceData)
	validateRuleList := make([]validate.StructField, 0)
	for _, itemParam := range apiCfg.ParamRuleList {
		arr := strings.Split(itemParam.Path, ".")
		sourcePath := itemParam.SourceResultPath
		sourcePath = fmt.Sprintf("%v.%v.%v", itemParam.SourceAlias, itemParam.SourceResultLocation, itemParam.SourceResultPath)
		validateRuleList = append(validateRuleList, validate.StructField{
			JsonTag:      arr[len(arr)-1],
			Type:         itemParam.Type,
			Required:     false,
			RuleList:     nil,
			DefaultValue: itemParam.DefaultValue,
			SourcePath:   sourcePath,
			TargetPath:   fmt.Sprintf("%v.%v", itemParam.Location, itemParam.Path),
			Errmsg:       "",
		})
	}
	buildRes, err := validate.Run(sourceDataByte, validateRuleList)
	if nil != err {
		return nil, err
	}
	var d map[string]map[string]any
	if err = serialize.JSON.UnmarshalWithNumber(buildRes, &d); nil != err {
		return nil, err
	}
	return d, err
}