package api

import (
	"context"
	"net/http"
	"strconv"

	"clash-speed-test/internal/config"
	"clash-speed-test/internal/core"
	"clash-speed-test/internal/database"
	"clash-speed-test/internal/logger"

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

type Server struct {
	config      *config.Config
	db          *gorm.DB
	speedTester *core.SpeedTester
	scheduler   *core.Scheduler
	router      *gin.Engine
	server      *http.Server
}

func NewServer(cfg *config.Config, db *gorm.DB, speedTester *core.SpeedTester, scheduler *core.Scheduler) *Server {
	gin.SetMode(gin.ReleaseMode)
	router := gin.New()
	router.Use(gin.Recovery())

	server := &Server{
		config:      cfg,
		db:          db,
		speedTester: speedTester,
		scheduler:   scheduler,
		router:      router,
	}

	server.setupRoutes()
	return server
}

func (s *Server) setupRoutes() {
	// 健康检查
	s.router.GET("/health", s.healthCheck)

	// API路由组
	api := s.router.Group("/api")
	{
		// 节点管理
		api.GET("/nodes", s.getNodes)
		api.POST("/nodes", s.createNode)
		api.PUT("/nodes/:id", s.updateNode)
		api.DELETE("/nodes/:id", s.deleteNode)

		// 测速相关
		api.GET("/speed-test", s.getSpeedTestResults)
		api.POST("/speed-test/trigger", s.triggerSpeedTest)
		api.GET("/speed-test/history/:nodeId", s.getNodeTestHistory)

		// 系统状态
		api.GET("/status", s.getSystemStatus)
	}

	// 静态文件服务
	s.router.Static("/static", "./static")
	s.router.LoadHTMLGlob("templates/*")

	// 主页
	s.router.GET("/", s.index)
}

// 启动服务器
func (s *Server) Start() error {
	addr := s.config.Server.Host + ":" + strconv.Itoa(s.config.Server.Port)
	s.server = &http.Server{
		Addr:    addr,
		Handler: s.router,
	}

	return s.server.ListenAndServe()
}

// 关闭服务器
func (s *Server) Shutdown(ctx context.Context) error {
	return s.server.Shutdown(ctx)
}

// 健康检查
func (s *Server) healthCheck(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"status":  "ok",
		"service": "clash-speed-test",
		"version": "1.0.0",
	})
}

// 主页
func (s *Server) index(c *gin.Context) {
	c.HTML(http.StatusOK, "index.html", gin.H{
		"title": "Clash Speed Test",
	})
}

// 获取所有节点
func (s *Server) getNodes(c *gin.Context) {
	var nodes []database.Node
	if err := s.db.Find(&nodes).Error; err != nil {
		logger.Error("获取节点列表失败", map[string]interface{}{
			"error": err.Error(),
		})
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取节点列表失败"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": nodes,
	})
}

// 创建节点
func (s *Server) createNode(c *gin.Context) {
	var node database.Node
	if err := c.ShouldBindJSON(&node); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数错误"})
		return
	}

	if err := s.db.Create(&node).Error; err != nil {
		logger.Error("创建节点失败", map[string]interface{}{
			"error": err.Error(),
		})
		c.JSON(http.StatusInternalServerError, gin.H{"error": "创建节点失败"})
		return
	}

	c.JSON(http.StatusCreated, gin.H{
		"data": node,
	})
}

// 更新节点
func (s *Server) updateNode(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的节点ID"})
		return
	}

	var node database.Node
	if err := s.db.First(&node, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "节点不存在"})
		return
	}

	var updateData database.Node
	if err := c.ShouldBindJSON(&updateData); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数错误"})
		return
	}

	if err := s.db.Model(&node).Updates(updateData).Error; err != nil {
		logger.Error("更新节点失败", map[string]interface{}{
			"error": err.Error(),
		})
		c.JSON(http.StatusInternalServerError, gin.H{"error": "更新节点失败"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": node,
	})
}

// 删除节点
func (s *Server) deleteNode(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的节点ID"})
		return
	}

	if err := s.db.Delete(&database.Node{}, id).Error; err != nil {
		logger.Error("删除节点失败", map[string]interface{}{
			"error": err.Error(),
		})
		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除节点失败"})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "节点删除成功"})
}

// 获取测速结果
func (s *Server) getSpeedTestResults(c *gin.Context) {
	limit := 50
	if limitStr := c.Query("limit"); limitStr != "" {
		if l, err := strconv.Atoi(limitStr); err == nil && l > 0 {
			limit = l
		}
	}

	results, err := database.GetRecentTestResults(limit)
	if err != nil {
		logger.Error("获取测速结果失败", map[string]interface{}{
			"error": err.Error(),
		})
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取测速结果失败"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": results,
	})
}

// 手动触发测速
func (s *Server) triggerSpeedTest(c *gin.Context) {
	s.scheduler.TriggerSpeedTest()

	c.JSON(http.StatusOK, gin.H{
		"message": "测速任务已触发",
	})
}

// 获取节点测试历史
func (s *Server) getNodeTestHistory(c *gin.Context) {
	nodeID, err := strconv.ParseUint(c.Param("nodeId"), 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的节点ID"})
		return
	}

	limit := 20
	if limitStr := c.Query("limit"); limitStr != "" {
		if l, err := strconv.Atoi(limitStr); err == nil && l > 0 {
			limit = l
		}
	}

	results, err := database.GetNodeTestHistory(uint(nodeID), limit)
	if err != nil {
		logger.Error("获取节点测试历史失败", map[string]interface{}{
			"error": err.Error(),
		})
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取节点测试历史失败"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": results,
	})
}

// 获取系统状态
func (s *Server) getSystemStatus(c *gin.Context) {
	// 获取节点统计
	var totalNodes, activeNodes int64
	s.db.Model(&database.Node{}).Count(&totalNodes)
	s.db.Model(&database.Node{}).Where("is_active = ?", true).Count(&activeNodes)

	// 获取测试结果统计
	var totalTests, successTests int64
	s.db.Model(&database.TestResult{}).Count(&totalTests)
	s.db.Model(&database.TestResult{}).Where("is_success = ?", true).Count(&successTests)

	// 计算平均延迟
	var avgLatency float64
	s.db.Model(&database.TestResult{}).
		Where("is_success = ? AND latency IS NOT NULL", true).
		Select("AVG(latency)").
		Scan(&avgLatency)

	// 计算成功率
	var successRate float64
	if totalTests > 0 {
		successRate = float64(successTests) / float64(totalTests) * 100
	}

	c.JSON(http.StatusOK, gin.H{
		"total_nodes":      totalNodes,
		"active_nodes":     activeNodes,
		"avg_latency":      int(avgLatency),
		"success_rate":     int(successRate),
		"scheduler_running": s.scheduler.IsRunning(),
	})
}