package handler

import (
	"context"
	"time"

	"spider/internal/model"
	"spider/internal/store"

	"github.com/gin-gonic/gin"
	"github.com/redis/go-redis/v9"
)

// DashboardHandler serves the dashboard summary endpoint.
type DashboardHandler struct {
	store *store.Store
	rdb   *redis.Client
}

// Get returns aggregated dashboard data.
func (h *DashboardHandler) Get(c *gin.Context) {
	db := h.store.DB

	// Total counts (combined query for clean)
	var rawTotal int64
	db.Model(&model.MerchantRaw{}).Count(&rawTotal)

	// Single query for clean total and valid total
	var cleanTotal, validTotal int64
	db.Model(&model.MerchantClean{}).Count(&cleanTotal)
	db.Model(&model.MerchantClean{}).Where("status = ?", "valid").Count(&validTotal)

	// By level
	type kv struct {
		Key   string `gorm:"column:key"`
		Count int64  `gorm:"column:count"`
	}
	var levelRows []kv
	db.Model(&model.MerchantClean{}).
		Select("level as `key`, count(*) as `count`").
		Group("level").
		Find(&levelRows)
	byLevel := gin.H{}
	for _, r := range levelRows {
		if r.Key == "" {
			r.Key = "Unknown"
		}
		byLevel[r.Key] = r.Count
	}

	// By status
	var statusRows []kv
	db.Model(&model.MerchantClean{}).
		Select("status as `key`, count(*) as `count`").
		Group("status").
		Find(&statusRows)
	byStatus := gin.H{}
	for _, r := range statusRows {
		byStatus[r.Key] = r.Count
	}

	// By source
	var sourceRows []kv
	db.Model(&model.MerchantRaw{}).
		Select("source_type as `key`, count(*) as `count`").
		Group("source_type").
		Find(&sourceRows)
	bySource := gin.H{}
	for _, r := range sourceRows {
		if r.Key == "" {
			r.Key = "unknown"
		}
		bySource[r.Key] = r.Count
	}

	// By industry
	var industryRows []kv
	db.Model(&model.MerchantClean{}).
		Select("industry_tag as `key`, count(*) as `count`").
		Where("industry_tag != ''").
		Group("industry_tag").
		Find(&industryRows)
	byIndustry := gin.H{}
	for _, r := range industryRows {
		byIndustry[r.Key] = r.Count
	}

	// Today added
	now := time.Now()
	todayStart := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
	var todayAdded int64
	db.Model(&model.MerchantRaw{}).Where("created_at >= ?", todayStart).Count(&todayAdded)

	// Week added
	weekStart := todayStart.AddDate(0, 0, -int(now.Weekday()))
	if now.Weekday() == 0 {
		weekStart = todayStart.AddDate(0, 0, -6)
	} else {
		weekStart = todayStart.AddDate(0, 0, -int(now.Weekday())+1)
	}
	var weekAdded int64
	db.Model(&model.MerchantRaw{}).Where("created_at >= ?", weekStart).Count(&weekAdded)

	// Recent tasks (last 5)
	var recentTasks []model.TaskLog
	db.Order("created_at DESC").Limit(5).Find(&recentTasks)

	// Daily trend (last 14 days)
	type trend struct {
		Date  string `gorm:"column:date" json:"date"`
		Count int64  `gorm:"column:count" json:"count"`
	}
	var dailyTrend []trend
	fourteenDaysAgo := todayStart.AddDate(0, 0, -13)
	db.Model(&model.MerchantRaw{}).
		Select("DATE(created_at) as date, count(*) as `count`").
		Where("created_at >= ?", fourteenDaysAgo).
		Group("DATE(created_at)").
		Order("date ASC").
		Find(&dailyTrend)

	OK(c, gin.H{
		"raw_total":    rawTotal,
		"clean_total":  cleanTotal,
		"valid_total":  validTotal,
		"by_level":     byLevel,
		"by_status":    byStatus,
		"by_source":    bySource,
		"by_industry":  byIndustry,
		"today_added":  todayAdded,
		"week_added":   weekAdded,
		"recent_tasks": recentTasks,
		"daily_trend":  dailyTrend,
	})
}

// Health returns system component health status.
func (h *DashboardHandler) Health(c *gin.Context) {
	db := h.store.DB
	health := gin.H{}

	// MySQL
	sqlDB, err := db.DB()
	if err != nil {
		health["mysql"] = gin.H{"status": "error", "error": err.Error()}
	} else {
		ctx, cancel := context.WithTimeout(c.Request.Context(), 3*time.Second)
		defer cancel()
		if err := sqlDB.PingContext(ctx); err != nil {
			health["mysql"] = gin.H{"status": "error", "error": err.Error()}
		} else {
			stats := sqlDB.Stats()
			health["mysql"] = gin.H{
				"status":       "ok",
				"open_conns":   stats.OpenConnections,
				"in_use":       stats.InUse,
				"idle":         stats.Idle,
				"max_open":     stats.MaxOpenConnections,
			}
		}
	}

	// Redis
	ctx2, cancel2 := context.WithTimeout(c.Request.Context(), 3*time.Second)
	defer cancel2()
	if err := h.rdb.Ping(ctx2).Err(); err != nil {
		health["redis"] = gin.H{"status": "error", "error": err.Error()}
	} else {
		health["redis"] = gin.H{"status": "ok"}
	}

	// TG accounts
	type tgStatus struct {
		Status string
		Cnt    int64
	}
	var tgRows []tgStatus
	db.Model(&model.TgAccount{}).Select("status, count(*) as cnt").Group("status").Scan(&tgRows)
	tgSummary := gin.H{}
	for _, r := range tgRows {
		tgSummary[r.Status] = r.Cnt
	}
	health["tg_accounts"] = tgSummary

	// Tasks last 24h
	yesterday := time.Now().Add(-24 * time.Hour)
	type taskStatus struct {
		Status string
		Cnt    int64
	}
	var taskRows []taskStatus
	db.Model(&model.TaskLog{}).Select("status, count(*) as cnt").
		Where("created_at >= ?", yesterday).Group("status").Scan(&taskRows)
	taskSummary := gin.H{}
	for _, r := range taskRows {
		taskSummary[r.Status] = r.Cnt
	}
	health["tasks_24h"] = taskSummary

	// Data counts
	var rawCount, cleanCount, detailCount int64
	db.Model(&model.MerchantRaw{}).Count(&rawCount)
	db.Model(&model.MerchantClean{}).Count(&cleanCount)
	db.Model(&model.TaskDetail{}).Count(&detailCount)
	health["data"] = gin.H{
		"merchants_raw":   rawCount,
		"merchants_clean": cleanCount,
		"task_details":    detailCount,
	}

	OK(c, health)
}