package handler

import (
	"github.com/gin-gonic/gin"
	"kefu-sys/server/internal/middleware"
	"kefu-sys/server/internal/model"
)

type StatisticsHandler struct{}

func NewStatisticsHandler() *StatisticsHandler { return &StatisticsHandler{} }

func (h *StatisticsHandler) KPIs(c *gin.Context) {
	tenantID := middleware.GetTenantID(c)

	var totalSessions, totalMessages int64
	var avgResponseTime float64
	var satisfactionAvg float64
	var firstResolveRate float64

	model.DB.Model(&model.Session{}).Where("tenant_id = ?", tenantID).Count(&totalSessions)
	model.DB.Model(&model.Message{}).
		Joins("JOIN sessions ON messages.session_id = sessions.id").
		Where("sessions.tenant_id = ?", tenantID).
		Count(&totalMessages)

	middleware.JSON(c, gin.H{
		"total_sessions":     totalSessions,
		"avg_response_time":  avgResponseTime,
		"satisfaction_avg":   satisfactionAvg,
		"first_resolve_rate": firstResolveRate,
		"total_messages":     totalMessages,
	})
}

func (h *StatisticsHandler) SessionTrend(c *gin.Context) {
	tenantID := middleware.GetTenantID(c)
	period := c.DefaultQuery("period", "day")

	_ = tenantID
	var data []gin.H
	if period == "day" {
		data = []gin.H{
			{"date": "07-08", "count": 420}, {"date": "07-09", "count": 380},
			{"date": "07-10", "count": 450}, {"date": "07-11", "count": 520},
			{"date": "07-12", "count": 490}, {"date": "07-13", "count": 550},
			{"date": "07-14", "count": 610},
		}
	} else {
		data = []gin.H{
			{"date": "06", "count": 12500}, {"date": "07", "count": 13800},
		}
	}

	middleware.JSON(c, data)
}

func (h *StatisticsHandler) AgentPerformance(c *gin.Context) {
	tenantID := middleware.GetTenantID(c)
	_ = tenantID

	data := []gin.H{
		{"name": "客服小王", "conversations": 420, "avg_response": 28, "satisfaction": 4.9},
		{"name": "客服小李", "conversations": 380, "avg_response": 35, "satisfaction": 4.7},
		{"name": "客服小张", "conversations": 350, "avg_response": 42, "satisfaction": 4.5},
	}

	middleware.JSON(c, data)
}

func (h *StatisticsHandler) ChannelDistribution(c *gin.Context) {
	data := []gin.H{
		{"type": "网页", "value": 45}, {"type": "微信", "value": 28},
		{"type": "APP", "value": 18}, {"type": "电话", "value": 6}, {"type": "邮件", "value": 3},
	}

	middleware.JSON(c, data)
}