package handler

import (
	"log"
	"net/http"
	"strconv"
	"strings"

	"x-agents/server/internal/model"
	"x-agents/server/internal/repository"
	"x-agents/server/internal/service"
	"x-agents/server/internal/utils"

	"github.com/gin-gonic/gin"
)

// AgentHandler Agent 处理器
type AgentHandler struct {
	agentService *service.AgentService
	agentRepo    *repository.AgentRepository
}

// NewAgentHandler 创建 Agent 处理器
func NewAgentHandler(agentService *service.AgentService, agentRepo *repository.AgentRepository) *AgentHandler {
	return &AgentHandler{
		agentService: agentService,
		agentRepo:    agentRepo,
	}
}

// ChatRequest 对话请求
type ChatRequest struct {
	AgentID           string   `json:"agent_id"` // 字符串类型，支持 UUID，可为空（当使用 mentioned_agent_ids 时）
	Message           string   `json:"message" binding:"required"`
	SessionID         string   `json:"session_id"`
	ModelID           string   `json:"model_id"`
	UseXBot           bool     `json:"use_xbot"`
	MentionedAgentIDs []string `json:"mentioned_agent_ids"` // @ 提及的智能体 ID 列表
}

// ChatResponse 对话响应
type ChatResponse struct {
	AgentID    string      `json:"agent_id"` // 支持 UUID 字符串
	Reply      string      `json:"reply"`
	ToolsUsed  []string    `json:"tools_used"`
	SessionID  string      `json:"session_id"`
	TokensUsed int         `json:"tokens_used"`
	DurationMs int         `json:"duration_ms"`
	Metadata   interface{} `json:"metadata"`
}


// CreateAgentResponse 创建智能体响应
type CreateAgentResponse struct {
	AgentID int    `json:"agent_id"`
	Name    string `json:"name"`
	Message string `json:"message"`
}

// ListAgentsResponse 获取智能体列表响应
type ListAgentsResponse struct {
	Agents []interface{} `json:"agents"`
}

// Chat 单智能体对话
// @Summary 单智能体对话
// @Tags 智能体管理
// @Accept json
// @Produce json
// @Param request body ChatRequest true "对话请求"
// @Success 200 {object} ChatResponse
// @Router /api/agent/chat [post]
func (h *AgentHandler) Chat(c *gin.Context) {
	var req ChatRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 获取用户 ID（从认证中间件获取）
	userIDStr := "1" // TODO: 从 c.Get("user_id") 获取
	userID, _ := strconv.Atoi(userIDStr)

	// 直接使用字符串类型的 agent_id，支持 UUID
	pythonReq := service.AgentChatRequest{
		AgentID:   req.AgentID,
		Message:   req.Message,
		UserID:    userID,
		SessionID: req.SessionID,
		ModelID:   req.ModelID,
		UseXBot:   req.UseXBot,
	}

	result, err := h.agentService.Chat(pythonReq)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// 转换工具调用
	toolsUsed := make([]string, 0)
	for _, tool := range result.ToolCalls {
		if toolMap, ok := tool.(map[string]interface{}); ok {
			if skillID, ok := toolMap["skill_id"].(string); ok {
				toolsUsed = append(toolsUsed, skillID)
			}
		}
	}

	c.JSON(http.StatusOK, ChatResponse{
		AgentID:    result.AgentID,
		Reply:      result.Response,
		ToolsUsed:  toolsUsed,
		SessionID:  result.SessionID,
		TokensUsed: result.TokensUsed,
		DurationMs: result.DurationMs,
		Metadata:   nil,
	})
}

// ChatStream 单智能体对话（流式输出）
// @Summary 单智能体对话（流式输出）
// @Tags 智能体管理
// @Accept json
// @Produce text/event-stream
// @Param request body ChatRequest true "对话请求"
// @Router /api/agent/chat/stream [post]
func (h *AgentHandler) ChatStream(c *gin.Context) {
	var req ChatRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 获取用户 ID
	userIDStr := "1" // TODO: 从 c.Get("user_id") 获取
	userID, _ := strconv.Atoi(userIDStr)

	// 直接使用字符串类型的 agent_id，支持 UUID
	agentID := req.AgentID

	// 优先使用前端传递的 mentioned_agent_ids
	if len(req.MentionedAgentIDs) > 0 {
		// 如果有多个 @ 提及，使用第一个
		mentionedAgentID := req.MentionedAgentIDs[0]
		log.Printf("[ChatStream] Using mentioned_agent_ids: %v", req.MentionedAgentIDs)
		agentID = mentionedAgentID
		// 清理消息，移除 @ 提及
		mentionParser := utils.NewMentionParser()
		req.Message = mentionParser.RemoveMentions(req.Message)
	} else if agentID == "" {
		// 兼容：解析消息中的 @ 提及（备用方案）
		mentionParser := utils.NewMentionParser()
		mentions := mentionParser.ParseMentions(req.Message)
		if len(mentions) > 0 {
			mentionedAgent := h.findAgentByName(mentions[0])
			if mentionedAgent != nil {
				log.Printf("[ChatStream] Detected @mention: %s, routing to agent: %s", mentions[0], mentionedAgent.ID)
				agentID = mentionedAgent.ID
			}
			req.Message = mentionParser.RemoveMentions(req.Message)
		}
	}

	// 构建 SSE 流
	c.Header("Content-Type", "text/event-stream")
	c.Header("Cache-Control", "no-cache")
	c.Header("Connection", "keep-alive")
	c.Header("Access-Control-Allow-Origin", "*")

	// 调用 Python 服务的流式端点
	err := h.agentService.ChatStream(c, agentID, req.Message, req.SessionID, req.ModelID, userID)
	if err != nil && !c.IsAborted() {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
	}
}

// findAgentByName 根据用户名查找智能体
func (h *AgentHandler) findAgentByName(name string) *model.Agent {
	log.Printf("[findAgentByName] Searching for agent: %s, agentRepo: %v", name, h.agentRepo)

	if h.agentRepo == nil {
		log.Printf("[findAgentByName] ERROR: agentRepo is nil!")
		return nil
	}

	// 先尝试精确匹配
	agents, err := h.agentRepo.FindAll()
	if err != nil {
		return nil
	}

	for _, agent := range agents {
		if agent.Name == name {
			return &agent
		}
	}

	// 再尝试模糊匹配（忽略大小写）
	for _, agent := range agents {
		if strings.Contains(strings.ToLower(agent.Name), strings.ToLower(name)) {
			return &agent
		}
	}

	return nil
}

// TeamChatRequest 多智能体群聊请求
type TeamChatRequest struct {
	SupervisorAgentID int      `json:"supervisor_agent_id" binding:"required"`
	MemberAgentIDs   []int    `json:"member_agent_ids" binding:"required"`
	Message         string   `json:"message" binding:"required"`
	SessionID       string   `json:"session_id"`
	Strategy        string   `json:"strategy"`
}

// TeamChatResponse 多智能体群聊响应
type TeamChatResponse struct {
	SupervisorAgentID int         `json:"supervisor_agent_id"`
	Reply             string      `json:"reply"`
	SubtaskResults    interface{} `json:"subtask_results"`
	Strategy          string      `json:"strategy"`
	SessionID         string      `json:"session_id"`
	DurationMs        int         `json:"duration_ms"`
	Metadata          interface{} `json:"metadata"`
}

// TeamChat 多智能体群聊
// @Summary 多智能体群聊
// @Tags 智能体管理
// @Accept json
// @Produce json
// @Param request body TeamChatRequest true "群聊请求"
// @Success 200 {object} TeamChatResponse
// @Router /api/agent/team/chat [post]
func (h *AgentHandler) TeamChat(c *gin.Context) {
	var req TeamChatRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 获取用户 ID
	userIDStr := "1" // TODO: 从 c.Get("user_id") 获取
	userID, _ := strconv.Atoi(userIDStr)

	pythonReq := service.TeamChatRequest{
		SupervisorAgentID: req.SupervisorAgentID,
		MemberAgentIDs:    req.MemberAgentIDs,
		Message:          req.Message,
		UserID:            userID,
		SessionID:         req.SessionID,
		Strategy:          req.Strategy,
	}

	result, err := h.agentService.TeamChat(pythonReq)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, TeamChatResponse{
		SupervisorAgentID: result.SupervisorAgentID,
		Reply:             result.Response,
		SubtaskResults:    result.SubtaskResults,
		Strategy:          result.Strategy,
		SessionID:         result.SessionID,
		DurationMs:        result.DurationMs,
		Metadata:          nil,
	})
}

// CreateAgent 创建智能体
// @Summary 创建智能体
// @Tags 智能体管理
// @Accept json
// @Produce json
// @Param request body CreateAgentRequest true "创建智能体请求"
// @Success 200 {object} CreateAgentResponse
// @Router /api/agent/create [post]
func (h *AgentHandler) CreateAgent(c *gin.Context) {
	var req service.CreateAgentRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 获取用户 ID
	userID := 1 // TODO: 从 c.Get("user_id") 获取

	result, err := h.agentService.CreateAgent(req, userID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, result)
}

// InitTeamMembersResponse 初始化团队成员响应
type InitTeamMembersResponse struct {
	Message string `json:"message"`
	Count   int    `json:"count"`
}

// InitTeamMembers 初始化团队成员智能体
// @Summary 初始化团队成员智能体
// @Tags 智能体管理
// @Produce json
// @Success 200 {object} InitTeamMembersResponse
// @Router /api/agent/init-team [post]
func (h *AgentHandler) InitTeamMembers(c *gin.Context) {
	if err := h.agentService.InitTeamMembers(); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, InitTeamMembersResponse{
		Message: "Team members initialized successfully",
		Count:   1, // 小荣
	})
}

// ListAgents 获取智能体列表
// @Summary 获取智能体列表
// @Tags 智能体管理
// @Produce json
// @Success 200 {object} ListAgentsResponse
// @Router /api/agent/list [get]
func (h *AgentHandler) ListAgents(c *gin.Context) {
	result, err := h.agentService.ListAgents()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, result)
}

// UpdateAgentStatusRequest 更新状态请求
type UpdateAgentStatusRequest struct {
	IsActive bool `json:"is_active"`
}

// UpdateAgentStatus 更新智能体状态
// @Summary 更新智能体状态
// @Tags 智能体管理
// @Accept json
// @Produce json
// @Param id path string true "Agent ID"
// @Param request body UpdateAgentStatusRequest true "状态请求"
// @Success 200 {object} gin.H
// @Router /api/agent/{id}/status [put]
func (h *AgentHandler) UpdateAgentStatus(c *gin.Context) {
	agentID := c.Param("id")
	if agentID == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "agent id is required"})
		return
	}

	var req UpdateAgentStatusRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	err := h.agentService.UpdateAgentStatus(agentID, req.IsActive)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "status updated successfully"})
}

// DeleteAgent 删除智能体
// @Summary 删除智能体
// @Tags 智能体管理
// @Produce json
// @Param id path string true "Agent ID"
// @Success 200 {object} gin.H
// @Router /api/agent/{id} [delete]
func (h *AgentHandler) DeleteAgent(c *gin.Context) {
	agentID := c.Param("id")
	if agentID == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "agent id is required"})
		return
	}

	err := h.agentService.DeleteAgent(agentID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "agent deleted successfully"})
}

// UpdateAgentRequest 更新智能体请求
type UpdateAgentRequest struct {
	Name            string   `json:"name"`
	Description     string   `json:"description"`
	Avatar          string   `json:"avatar"`
	Skills          []string `json:"skills"`
	RoleDescription string   `json:"role_description"`
	ModelProvider   string   `json:"model_provider"`
	ModelName       string   `json:"model_name"`
}

// UpdateAgent 更新智能体
// @Summary 更新智能体
// @Tags 智能体管理
// @Accept json
// @Produce json
// @Param id path string true "Agent ID"
// @Param request body UpdateAgentRequest true "更新请求"
// @Success 200 {object} gin.H
// @Router /api/agent/{id} [put]
func (h *AgentHandler) UpdateAgent(c *gin.Context) {
	agentID := c.Param("id")
	if agentID == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "agent id is required"})
		return
	}

	var req UpdateAgentRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	err := h.agentService.UpdateAgent(agentID, req.Name, req.Description, req.Avatar, req.Skills, req.RoleDescription, req.ModelProvider, req.ModelName)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "agent updated successfully"})
}