package handler

import (
	"net/http"
	"strconv"
	"time"

	"cyberstrike-ai/internal/database"
	"cyberstrike-ai/internal/mcp"
	"cyberstrike-ai/internal/security"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

// MonitorHandler 监控处理器
type MonitorHandler struct {
	mcpServer      *mcp.Server
	externalMCPMgr *mcp.ExternalMCPManager
	executor       *security.Executor
	db             *database.DB
	logger         *zap.Logger
}

// NewMonitorHandler 创建新的监控处理器
func NewMonitorHandler(mcpServer *mcp.Server, executor *security.Executor, db *database.DB, logger *zap.Logger) *MonitorHandler {
	return &MonitorHandler{
		mcpServer:      mcpServer,
		externalMCPMgr: nil, // 将在创建后设置
		executor:       executor,
		db:             db,
		logger:         logger,
	}
}

// SetExternalMCPManager 设置外部MCP管理器
func (h *MonitorHandler) SetExternalMCPManager(mgr *mcp.ExternalMCPManager) {
	h.externalMCPMgr = mgr
}

// MonitorResponse 监控响应
type MonitorResponse struct {
	Executions []*mcp.ToolExecution      `json:"executions"`
	Stats      map[string]*mcp.ToolStats `json:"stats"`
	Timestamp  time.Time                  `json:"timestamp"`
	Total      int                        `json:"total,omitempty"`
	Page       int                        `json:"page,omitempty"`
	PageSize   int                        `json:"page_size,omitempty"`
	TotalPages int                        `json:"total_pages,omitempty"`
}

// Monitor 获取监控信息
func (h *MonitorHandler) Monitor(c *gin.Context) {
	// 解析分页参数
	page := 1
	pageSize := 20
	if pageStr := c.Query("page"); pageStr != "" {
		if p, err := strconv.Atoi(pageStr); err == nil && p > 0 {
			page = p
		}
	}
	if pageSizeStr := c.Query("page_size"); pageSizeStr != "" {
		if ps, err := strconv.Atoi(pageSizeStr); err == nil && ps > 0 && ps <= 100 {
			pageSize = ps
		}
	}

	executions, total := h.loadExecutionsWithPagination(page, pageSize)
	stats := h.loadStats()

	totalPages := (total + pageSize - 1) / pageSize
	if totalPages == 0 {
		totalPages = 1
	}

	c.JSON(http.StatusOK, MonitorResponse{
		Executions: executions,
		Stats:      stats,
		Timestamp:  time.Now(),
		Total:      total,
		Page:       page,
		PageSize:   pageSize,
		TotalPages: totalPages,
	})
}

func (h *MonitorHandler) loadExecutions() []*mcp.ToolExecution {
	executions, _ := h.loadExecutionsWithPagination(1, 1000)
	return executions
}

func (h *MonitorHandler) loadExecutionsWithPagination(page, pageSize int) ([]*mcp.ToolExecution, int) {
	if h.db == nil {
		allExecutions := h.mcpServer.GetAllExecutions()
		total := len(allExecutions)
		offset := (page - 1) * pageSize
		end := offset + pageSize
		if end > total {
			end = total
		}
		if offset >= total {
			return []*mcp.ToolExecution{}, total
		}
		return allExecutions[offset:end], total
	}

	offset := (page - 1) * pageSize
	executions, err := h.db.LoadToolExecutionsWithPagination(offset, pageSize)
	if err != nil {
		h.logger.Warn("从数据库加载执行记录失败，回退到内存数据", zap.Error(err))
		allExecutions := h.mcpServer.GetAllExecutions()
		total := len(allExecutions)
		offset := (page - 1) * pageSize
		end := offset + pageSize
		if end > total {
			end = total
		}
		if offset >= total {
			return []*mcp.ToolExecution{}, total
		}
		return allExecutions[offset:end], total
	}

	// 获取总数
	total, err := h.db.CountToolExecutions()
	if err != nil {
		h.logger.Warn("获取执行记录总数失败", zap.Error(err))
		// 回退：使用已加载的记录数估算
		total = offset + len(executions)
		if len(executions) == pageSize {
			total = offset + len(executions) + 1
		}
	}

	return executions, total
}

func (h *MonitorHandler) loadStats() map[string]*mcp.ToolStats {
	// 合并内部MCP服务器和外部MCP管理器的统计信息
	stats := make(map[string]*mcp.ToolStats)

	// 加载内部MCP服务器的统计信息
	if h.db == nil {
		internalStats := h.mcpServer.GetStats()
		for k, v := range internalStats {
			stats[k] = v
		}
	} else {
		dbStats, err := h.db.LoadToolStats()
		if err != nil {
			h.logger.Warn("从数据库加载统计信息失败，回退到内存数据", zap.Error(err))
			internalStats := h.mcpServer.GetStats()
			for k, v := range internalStats {
				stats[k] = v
			}
		} else {
			for k, v := range dbStats {
				stats[k] = v
			}
		}
	}

	// 合并外部MCP管理器的统计信息
	if h.externalMCPMgr != nil {
		externalStats := h.externalMCPMgr.GetToolStats()
		for k, v := range externalStats {
			// 如果已存在，合并统计信息
			if existing, exists := stats[k]; exists {
				existing.TotalCalls += v.TotalCalls
				existing.SuccessCalls += v.SuccessCalls
				existing.FailedCalls += v.FailedCalls
				// 使用最新的调用时间
				if v.LastCallTime != nil && (existing.LastCallTime == nil || v.LastCallTime.After(*existing.LastCallTime)) {
					existing.LastCallTime = v.LastCallTime
				}
			} else {
				stats[k] = v
			}
		}
	}

	return stats
}


// GetExecution 获取特定执行记录
func (h *MonitorHandler) GetExecution(c *gin.Context) {
	id := c.Param("id")

	// 先从内部MCP服务器查找
	exec, exists := h.mcpServer.GetExecution(id)
	if exists {
		c.JSON(http.StatusOK, exec)
		return
	}

	// 如果找不到，尝试从外部MCP管理器查找
	if h.externalMCPMgr != nil {
		exec, exists = h.externalMCPMgr.GetExecution(id)
		if exists {
			c.JSON(http.StatusOK, exec)
			return
		}
	}

	// 如果都找不到，尝试从数据库查找（如果使用数据库存储）
	if h.db != nil {
		exec, err := h.db.GetToolExecution(id)
		if err == nil && exec != nil {
			c.JSON(http.StatusOK, exec)
			return
		}
	}

	c.JSON(http.StatusNotFound, gin.H{"error": "执行记录未找到"})
}

// GetStats 获取统计信息
func (h *MonitorHandler) GetStats(c *gin.Context) {
	stats := h.loadStats()
	c.JSON(http.StatusOK, stats)
}