package prompt

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"prompts-core/service/session"

	"prompts-core/common/util"
	"prompts-core/consts/public"
	"prompts-core/dao"
	"prompts-core/model/dto"
	"prompts-core/model/entity"
	"prompts-core/service/gateway"

	"gitea.com/red-future/common/beans"
	"gitea.com/red-future/common/utils"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/util/gconv"
)

// ComposeMessages 核心拼接提示词主流程
func ComposeMessages(ctx context.Context, req *dto.ComposeMessagesReq) (*dto.ComposeMessagesRes, error) {
	// 1) 获取模型信息
	chatModel, aiModel, err := GetModelMessage(ctx, req)
	if err != nil {
		return nil, err
	}
	// 2) 校验用户表单
	if err = validateUserForm(req, aiModel); err != nil {
		return nil, err
	}
	return handleBuild(ctx, req, chatModel, aiModel)
}

// GetModelMessage 获取模型信息
func GetModelMessage(ctx context.Context, req *dto.ComposeMessagesReq) (*gateway.AsynchModel, *gateway.AsynchModel, error) {
	userInfo, err := utils.GetUserInfo(ctx)
	if err != nil {
		return nil, nil, fmt.Errorf("获取用户信息失败: %w", err)
	}
	chatModel, err := gateway.GetModelConfig(ctx, &gateway.AsynchModel{
		SQLBaseDO:   beans.SQLBaseDO{Creator: userInfo.UserName},
		IsChatModel: 1,
	})
	if err != nil || chatModel == nil {
		return nil, nil, errors.New("当前没有对话模型，请添加")
	}

	aiModel, err := gateway.GetModelConfig(ctx, &gateway.AsynchModel{
		SQLBaseDO: beans.SQLBaseDO{TenantId: userInfo.TenantId, Creator: userInfo.UserName},
		ModelName: req.ModelName,
	})
	if err != nil || aiModel == nil {
		return nil, nil, errors.New("需要构建的模型不存在")
	}

	return chatModel, aiModel, nil
}

// validateUserForm 校验用户表单
func validateUserForm(req *dto.ComposeMessagesReq, model *gateway.AsynchModel) error {
	if len(req.UserForm) == 0 {
		return nil
	}
	isValid, exceedTokens, err := util.CheckUserFormWithinWindow(req.UserForm, model.TokenConfig)
	if err != nil {
		return fmt.Errorf("校验用户表单失败: %w", err)
	}

	if !isValid {
		availableWindow := util.GetAvailableWindow(model.TokenConfig)
		return fmt.Errorf("UserForm 内容超出窗口大小: 超出 %d tokens，可用窗口 %d tokens，请精简后重试",
			exceedTokens, availableWindow)
	}
	return nil
}

// handleBuild 通用构建处理
func handleBuild(ctx context.Context, req *dto.ComposeMessagesReq, chatModel, aiModel *gateway.AsynchModel) (*dto.ComposeMessagesRes, error) {
	// 1) 处理表单分批
	processedReq, totalBatches, err := ProcessUserFormBatches(ctx, req, aiModel)
	if err != nil {
		return nil, fmt.Errorf("处理用户表单分批失败: %w", err)
	}

	// 2) 构建推理请求
	ir := NewPromptIR()
	var taskReq map[string]any
	switch req.BuildType {
	case public.BuildTypePrompt:
		taskReq, err = buildPromptTypeRequest(ctx, processedReq, aiModel, chatModel, ir, totalBatches)
	case public.BuildTypeNode:
		taskReq, err = buildNodeTypeRequest(ctx, req, chatModel, ir)
	case public.BuildTypeStruct:
		taskReq, err = buildStructTypeRequest(ctx, req, chatModel, ir)
	default:
		return nil, errors.New("不支持的构建类型")
	}
	if err != nil {
		return nil, fmt.Errorf("构建推理请求失败: %w", err)
	}

	// 3) 调用网关创建任务
	taskID, err := gateway.CreateGatewayTask(ctx, taskReq)
	if err != nil {
		return nil, fmt.Errorf("创建网关任务失败: %w", err)
	}
	if taskID == "" {
		return nil, errors.New("网关未返回taskId")
	}

	// 4) 保存任务记录
	if _, err = dao.ComposeTask.Insert(ctx, &entity.ComposeTask{
		TaskId:         taskID,
		ModelName:      req.ModelName,
		SkillName:      req.SkillName,
		BuildType:      req.BuildType,
		CallbackUrl:    req.CallbackUrl,
		RequestPayload: util.MustMarshalToMap(req),
		Status:         public.ComposeStatusPending,
	}); err != nil {
		return nil, err
	}
	return &dto.ComposeMessagesRes{TaskId: taskID}, nil
}

// Callback 回调处理
func Callback(ctx context.Context, req *dto.CallbackReq) error {
	g.Log().Infof(ctx, "[开始回调处理] taskId=%s state=%d", req.TaskId, req.State)
	// 1) 查询任务
	composeTask, err := dao.ComposeTask.Get(ctx, &entity.ComposeTask{TaskId: req.TaskId})
	if err != nil {
		return fmt.Errorf("查询任务失败: %w", err)
	}
	// 2) 处理失败
	if req.State == 3 {
		return handleCallbackFailed(ctx, req, composeTask)
	}
	// 3) 处理成功
	if req.State == 2 {
		return handleCallbackSuccess(ctx, req, composeTask)
	}
	return nil
}

// handleCallbackFailed 处理回调失败
func handleCallbackFailed(ctx context.Context, req *dto.CallbackReq, composeTask *entity.ComposeTask) error {
	_, err := dao.ComposeTask.Update(ctx, &entity.ComposeTask{
		TaskId:       req.TaskId,
		Status:       public.ComposeStatusFailed,
		ErrorMessage: req.ErrorMsg,
		GatewayState: req.State,
		OssFile:      req.OssFile,
		FileType:     req.FileType,
		ResultText:   req.Messages,
	})
	if composeTask.CallbackUrl != "" {
		composeTask.Status = public.ComposeStatusFailed
		composeTask.ErrorMessage = req.ErrorMsg
		_ = gateway.SendCallback(ctx, composeTask, 0)
	}
	return err
}

// handleCallbackSuccess 处理回调成功
func handleCallbackSuccess(ctx context.Context, req *dto.CallbackReq, composeTask *entity.ComposeTask) error {
	// 1) 获取模型配置
	model, err := gateway.GetModelConfig(ctx, &gateway.AsynchModel{
		SQLBaseDO: beans.SQLBaseDO{Creator: composeTask.Creator},
		ModelName: composeTask.ModelName,
	})
	if err != nil {
		return fmt.Errorf("查询模型失败: %w", err)
	}

	// 2) 合并附加结构
	messages := util.MergeConsult(composeTask.RequestPayload, req.Messages, model.ExtendMapping)
	// 3) 更新数据库
	_, err = dao.ComposeTask.Update(ctx, &entity.ComposeTask{
		TaskId:       req.TaskId,
		Status:       public.ComposeStatusSuccess,
		Messages:     messages,
		GatewayState: req.State,
		OssFile:      req.OssFile,
		FileType:     req.FileType,
		ResultText:   req.Messages,
	})
	if err != nil {
		return err
	}
	//var userHistoryMsg map[string]any
	var epicycleId int64
	payload := composeTask.RequestPayload
	sessionId := gconv.String(payload["sessionId"])
	nodeId := gconv.String(payload["nodeId"])
	buildType := gconv.Int(payload["buildType"])
	if buildType == public.BuildTypePrompt && sessionId != "" && nodeId != "" {
		// 4) 获取历史内容并拼接
		history, _ := session.GetHistoryMessages(ctx, sessionId, nodeId)
		for _, msg := range history {
			role := gconv.String(msg["role"])
			if role != "user" && role != "assistant" {
				continue
			}
		}
		// 5) 存储提示词结果作为历史请求
		if userMsg := util.ExtractUserText(messages); userMsg != nil {
			epicycleId, err = dao.ComposeSession.Insert(ctx, &entity.ComposeSession{
				NodeId:         nodeId,
				SessionId:      sessionId,
				RequestContent: userMsg,
			})
		}
	}
	// 6) 回调业务方
	if composeTask.CallbackUrl != "" {
		composeTask.Status = public.ComposeStatusSuccess
		composeTask.Messages = messages
		_ = gateway.SendCallback(ctx, composeTask, epicycleId)
	}
	return nil
}

// GetComposeTask 查询任务结果
func GetComposeTask(ctx context.Context, taskID string) (*dto.GetComposeTaskRes, error) {
	record, err := dao.ComposeTask.Get(ctx, &entity.ComposeTask{
		TaskId: taskID,
	})
	if err != nil {
		return nil, fmt.Errorf("查询任务失败: %w", err)
	}
	if record == nil {
		return nil, fmt.Errorf("未找到任务(taskId=%s)", taskID)
	}

	messages := parseMessagesForResponse(record.Messages)

	return &dto.GetComposeTaskRes{
		TaskId:       record.TaskId,
		Status:       record.Status,
		ErrorMessage: record.ErrorMessage,
		Messages:     messages,
	}, nil
}

// parseMessagesForResponse 解析用于响应的消息
func parseMessagesForResponse(messages any) any {
	str, ok := messages.(string)
	if !ok || str == "" {
		return messages
	}

	var parsed any
	if err := json.Unmarshal([]byte(str), &parsed); err == nil {
		return parsed
	}

	return messages
}

func GetPromptText(ctx context.Context, req *dto.GetPromptTextReq) (*dto.GetPromptTextRes, error) {
	// 1) 获取基础数据

	// 4) 模拟历史拼接
	history, _ := session.GetHistoryMessages(ctx, "88888888", "node1")
	return &dto.GetPromptTextRes{
		Messages: history,
	}, nil
}