package flow

import (
	"ai-agent/gateway"
	"ai-agent/workflow/consts/node"
	flowDto "ai-agent/workflow/model/dto/flow"
	"context"
	"fmt"
	"sync"

	commonHttp "gitea.redpowerfuture.com/red-future/common/http"
	"gitea.redpowerfuture.com/red-future/common/utils"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"
	"github.com/gogf/gf/v2/util/gconv"
	"github.com/google/uuid"
)

// 全局等待任务回调的工具
var (
	asyncMu    sync.Mutex
	asyncTasks = make(map[string]chan any)
)

// Wait 阻塞等待回调结果
// 调用后会一直卡住，直到 Notify 唤醒 或 超时/取消
func Wait(ctx context.Context, taskId string) (any, error) {
	asyncMu.Lock()
	ch := make(chan any, 1)
	asyncTasks[taskId] = ch
	asyncMu.Unlock()

	defer close(ch)
	for {
		select {
		case result := <-ch:
			return result, nil
		case <-ctx.Done():
			asyncMu.Lock()
			delete(asyncTasks, taskId)
			asyncMu.Unlock()
			return nil, ctx.Err()
		}
	}
}

// Notify 回调时调用，唤醒等待的任务
func Notify(taskId string, result any) {
	asyncMu.Lock()
	defer asyncMu.Unlock()

	ch, exist := asyncTasks[taskId]
	if !exist {
		return
	}
	ch <- result
	delete(asyncTasks, taskId)
}

// ModelCallResultLambda 调用模型并返回输出内容列表，同时回传本次调用的 token/费用（*gateway.ModelCallRes），
// 供调用方（ModelLambda）累计写入节点执行记录 token_info，最后由汇总节点聚合到 exec_workflow。
func ModelCallResultLambda(ctx context.Context, modelId int64, sessionId string, modelRequestParams map[string]any) ([]map[string]any, *gateway.ModelCallRes, error) {
	modelInfo, err := gateway.GetModelInfoById(ctx, &gateway.GetModelInfoByIdReq{ModelId: modelId})
	if err != nil {
		return nil, nil, fmt.Errorf("获取模型配置失败: %w", err)
	}
	// 异步模型 msgTopic 由 gateway.ModelCallResult 在为空时自动生成（唯一、带业务标识），调用方无需管理
	responseParams, err := gateway.ModelCallResult(ctx, modelId, modelInfo.ModelManage.ResponseType, sessionId, modelRequestParams, nil)
	if err != nil {
		return nil, nil, err
	}
	if g.IsEmpty(responseParams) {
		return nil, nil, fmt.Errorf("生成内容为空")
	}
	outputRes := make([]map[string]any, 0)
	for key, val := range responseParams.Content {
		outputRes = append(outputRes, map[string]any{
			key: val,
		})
	}
	return outputRes, responseParams, nil
}

func HttpCallResultLambda(ctx context.Context, nodeInput *flowDto.NodeExecutionInput) ([]map[string]any, error) {
	var method, url, responseType, callbackUrl string
	var headers map[string]string
	var body map[string]any
	var responseMapping map[string]any

	n := new([]node.NodePresetField)
	err := gconv.Structs(nodeInput.Config.OutputConfig, n)
	if err != nil {
		return nil, err
	}

	for _, item := range *n {
		switch item.Field {
		case "method":
			method = gconv.String(item.Value)
		case "url":
			url = gconv.String(item.Value)
		case "headers":
			headers = gconv.MapStrStr(item.Value)
		case "body":
			body = gconv.Map(item.Value)
		case "response":
			// 先剥掉 {type, value/attrs} 包裹层，得到干净的输出结构模板
			responseMapping = gconv.Map(UnwrapSchemaWrapper(gconv.Map(item.Value)))
		case "responseType":
			responseType = gconv.String(item.Value)
			if responseType == "callback" {
				callbackUrl = item.Options[0].Config[0].Value
			}
		}
	}

	if method == "" {
		return nil, fmt.Errorf("method为空")
	}
	if url == "" {
		return nil, fmt.Errorf("url为空")
	}

	if headers == nil {
		headers = make(map[string]string)
		if r := g.RequestFromCtx(ctx); r != nil {
			for k, v := range r.Request.Header {
				if len(v) > 0 {
					headers[k] = v[0]
				}
			}
		}
	}

	// 构建请求参数
	ProcessValueSourceRecursive(body, nodeInput.Global)
	// 递归剥掉 {type, value/attrs} 包裹层，只保留 key/value
	wrapper := UnwrapSchemaWrapper(body)
	newBody := gconv.Map(wrapper)

	// 1. 自己生成唯一 taskId（不用前端给）
	taskId := "my_task_" + uuid.New().String() // 自己生成唯一ID
	if responseType == "callback" {
		newBody[callbackUrl] = utils.GetCallbackURL(ctx, "/httpNodeCallback?task_id="+taskId)
	}
	// ====================== 核心改动 ======================
	// 1. 定义一个空map接收原始HTTP返回结果
	var rawHttpResult map[string]any
	// 2. 发送请求（不变）
	if method == "GET" {
		err = commonHttp.Get(ctx, url, headers, &rawHttpResult, newBody)
	} else if method == "POST" {
		err = commonHttp.Post(ctx, url, headers, &rawHttpResult, newBody)
	} else if method == "PUT" {
		err = commonHttp.Put(ctx, url, headers, &rawHttpResult, newBody)
	} else if method == "DELETE" {
		err = commonHttp.Delete(ctx, url, headers, &rawHttpResult, newBody)
	} else {
		return nil, fmt.Errorf("method 不支持")
	}
	if err != nil {
		return nil, err
	}

	var e = ""

	finalResult := make(map[string]any)
	if responseType == "sync" {
		httpResultJson := gconv.String(rawHttpResult)
		// 按 responseMapping 定义的结构，从 http 返回结果中拷贝对应字段
		finalResult = MapResultByTemplate(responseMapping, rawHttpResult)
		e = httpResultJson
	}
	if responseType == "callback" {
		var waitResult any
		waitResult, err = Wait(ctx, taskId)
		if err != nil {
			return nil, err
		}
		request, ok := waitResult.(*ghttp.Request)
		if !ok {
			return nil, fmt.Errorf("入参类型错误")
		}

		bodyStr := request.GetBodyString()
		// 按 responseMapping 定义的结构，从回调结果中拷贝对应字段
		finalResult = MapResultByTemplate(responseMapping, gconv.Map(bodyStr))
		e = bodyStr
	}
	if responseType == "pull" {
		return nil, fmt.Errorf("pull 暂不支持")
	}

	if g.IsEmpty(finalResult) {
		return nil, fmt.Errorf("http请求异常，返回结果为空：%v", e)
	}

	outputRes := make([]map[string]any, 0)
	for i, item := range finalResult {
		if nodeInput.Config.IsSaveFile {
			outputRes = append(outputRes, map[string]any{
				fmt.Sprintf("http_file_url:%v", i): item,
			})
		}
		outputRes = append(outputRes, map[string]any{
			fmt.Sprintf("%v", i): item,
		})
	}

	return outputRes, nil
}