package controllers

import (
	"fmt"
	"time"

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

	"fotbal-club/internal/models"
	"fotbal-club/pkg/database"
)

// EquipmentController handles equipment management operations
type EquipmentController struct {
	db *gorm.DB
}

// NewEquipmentController creates a new equipment controller
func NewEquipmentController() *EquipmentController {
	return &EquipmentController{
		db: database.GetDB(),
	}
}

// EquipmentListRequest represents query parameters for equipment listing
type EquipmentListRequest struct {
	FacilityID uint   `form:"facility_id"`
	Category   string `form:"category"`
	Status     string `form:"status"`
	Page       int    `form:"page,default=1"`
	Limit      int    `form:"limit,default=20"`
	Search     string `form:"search"`
}

// GetEquipment handles GET /api/v1/admin/equipment
func (ec *EquipmentController) GetEquipment(c *gin.Context) {
	var req EquipmentListRequest
	if err := c.ShouldBindQuery(&req); err != nil {
		c.JSON(400, gin.H{"error": err.Error()})
		return
	}

	var equipment []models.FacilityEquipment
	query := ec.db.Model(&models.FacilityEquipment{})

	// Apply filters
	if req.FacilityID > 0 {
		query = query.Where("facility_id = ?", req.FacilityID)
	}
	if req.Category != "" {
		query = query.Where("category = ?", req.Category)
	}
	if req.Status != "" {
		query = query.Where("status = ?", req.Status)
	}
	if req.Search != "" {
		query = query.Where("name ILIKE ? OR description ILIKE ?", "%"+req.Search+"%", "%"+req.Search+"%")
	}

	// Count total
	var total int64
	query.Count(&total)

	// Apply pagination
	offset := (req.Page - 1) * req.Limit
	query = query.Offset(offset).Limit(req.Limit)

	if err := query.Preload("Facility").Find(&equipment).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to fetch equipment"})
		return
	}

	c.JSON(200, gin.H{
		"equipment": equipment,
		"total":     total,
		"page":      req.Page,
		"limit":     req.Limit,
	})
}

// CreateEquipment handles POST /api/v1/admin/equipment
func (ec *EquipmentController) CreateEquipment(c *gin.Context) {
	var equipment models.FacilityEquipment
	if err := c.ShouldBindJSON(&equipment); err != nil {
		c.JSON(400, gin.H{"error": err.Error()})
		return
	}

	// Set default values
	if equipment.Status == "" {
		equipment.Status = models.EquipmentStatusAvailable
	}
	if equipment.Available == 0 {
		equipment.Available = equipment.Quantity
	}

	if err := ec.db.Create(&equipment).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to create equipment"})
		return
	}

	c.JSON(201, gin.H{"equipment": equipment})
}

// UpdateEquipment handles PUT /api/v1/admin/equipment/:id
func (ec *EquipmentController) UpdateEquipment(c *gin.Context) {
	id := c.Param("id")

	var equipment models.FacilityEquipment
	if err := ec.db.First(&equipment, id).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(404, gin.H{"error": "Equipment not found"})
		} else {
			c.JSON(500, gin.H{"error": "Failed to fetch equipment"})
		}
		return
	}

	var updates models.FacilityEquipment
	if err := c.ShouldBindJSON(&updates); err != nil {
		c.JSON(400, gin.H{"error": err.Error()})
		return
	}

	if err := ec.db.Model(&equipment).Updates(updates).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to update equipment"})
		return
	}

	// Fetch updated equipment
	if err := ec.db.Preload("Facility").First(&equipment, id).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to fetch updated equipment"})
		return
	}

	c.JSON(200, gin.H{"equipment": equipment})
}

// DeleteEquipment handles DELETE /api/v1/admin/equipment/:id
func (ec *EquipmentController) DeleteEquipment(c *gin.Context) {
	id := c.Param("id")

	if err := ec.db.Delete(&models.FacilityEquipment{}, id).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to delete equipment"})
		return
	}

	c.JSON(200, gin.H{"message": "Equipment deleted successfully"})
}

// MaintenanceController handles maintenance scheduling operations
type MaintenanceController struct {
	db *gorm.DB
}

// NewMaintenanceController creates a new maintenance controller
func NewMaintenanceController() *MaintenanceController {
	return &MaintenanceController{
		db: database.GetDB(),
	}
}

// MaintenanceListRequest represents query parameters for maintenance listing
type MaintenanceListRequest struct {
	FacilityID uint   `form:"facility_id"`
	Type       string `form:"type"`
	Status     string `form:"status"`
	StartDate  string `form:"start_date"`
	EndDate    string `form:"end_date"`
	Page       int    `form:"page,default=1"`
	Limit      int    `form:"limit,default=20"`
}

// GetMaintenance handles GET /api/v1/admin/maintenance
func (mc *MaintenanceController) GetMaintenance(c *gin.Context) {
	var req MaintenanceListRequest
	if err := c.ShouldBindQuery(&req); err != nil {
		c.JSON(400, gin.H{"error": err.Error()})
		return
	}

	var maintenance []models.FacilityMaintenance
	query := mc.db.Model(&models.FacilityMaintenance{})

	// Apply filters
	if req.FacilityID > 0 {
		query = query.Where("facility_id = ?", req.FacilityID)
	}
	if req.Type != "" {
		query = query.Where("type = ?", req.Type)
	}
	if req.Status != "" {
		query = query.Where("status = ?", req.Status)
	}
	if req.StartDate != "" {
		query = query.Where("scheduled_date >= ?", req.StartDate)
	}
	if req.EndDate != "" {
		query = query.Where("scheduled_date <= ?", req.EndDate)
	}

	// Count total
	var total int64
	query.Count(&total)

	// Apply pagination
	offset := (req.Page - 1) * req.Limit
	query = query.Offset(offset).Limit(req.Limit)

	if err := query.Preload("Facility").Order("scheduled_date ASC").Find(&maintenance).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to fetch maintenance records"})
		return
	}

	c.JSON(200, gin.H{
		"maintenance": maintenance,
		"total":       total,
		"page":        req.Page,
		"limit":       req.Limit,
	})
}

// CreateMaintenance handles POST /api/v1/admin/maintenance
func (mc *MaintenanceController) CreateMaintenance(c *gin.Context) {
	var maintenance models.FacilityMaintenance
	if err := c.ShouldBindJSON(&maintenance); err != nil {
		c.JSON(400, gin.H{"error": err.Error()})
		return
	}

	// Set default status
	if maintenance.Status == "" {
		maintenance.Status = "scheduled"
	}

	if err := mc.db.Create(&maintenance).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to create maintenance record"})
		return
	}

	// If facility is unavailable during maintenance, update facility status
	if maintenance.IsFacilityUnavailable && maintenance.ScheduledDate != nil {
		mc.db.Model(&models.Facility{}).Where("id = ?", maintenance.FacilityID).
			Update("status", models.FacilityStatusMaintenance)
	}

	c.JSON(201, gin.H{"maintenance": maintenance})
}

// UpdateMaintenance handles PUT /api/v1/admin/maintenance/:id
func (mc *MaintenanceController) UpdateMaintenance(c *gin.Context) {
	id := c.Param("id")

	var maintenance models.FacilityMaintenance
	if err := mc.db.First(&maintenance, id).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(404, gin.H{"error": "Maintenance record not found"})
		} else {
			c.JSON(500, gin.H{"error": "Failed to fetch maintenance record"})
		}
		return
	}

	var updates models.FacilityMaintenance
	if err := c.ShouldBindJSON(&updates); err != nil {
		c.JSON(400, gin.H{"error": err.Error()})
		return
	}

	// Store old values for comparison
	oldStatus := maintenance.Status
	oldIsUnavailable := maintenance.IsFacilityUnavailable

	if err := mc.db.Model(&maintenance).Updates(updates).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to update maintenance record"})
		return
	}

	// Fetch updated maintenance
	if err := mc.db.Preload("Facility").First(&maintenance, id).Error; err != nil {
		c.JSON(500, gin.H{"error": "Failed to fetch updated maintenance record"})
		return
	}

	// Update facility status if maintenance is completed
	if oldStatus != "completed" && maintenance.Status == "completed" && oldIsUnavailable {
		mc.db.Model(&models.Facility{}).Where("id = ?", maintenance.FacilityID).
			Update("status", models.FacilityStatusActive)
	}

	c.JSON(200, gin.H{"maintenance": maintenance})
}

// WeatherController handles weather integration for outdoor facilities
type WeatherController struct {
	db     *gorm.DB
	apiKey string // OpenWeatherMap API key
}

// NewWeatherController creates a new weather controller
func NewWeatherController(apiKey string) *WeatherController {
	return &WeatherController{
		db:     database.GetDB(),
		apiKey: apiKey,
	}
}

// WeatherResponse represents weather data
type WeatherResponse struct {
	DateTime        time.Time `json:"date_time"`
	Temperature     float64   `json:"temperature"`
	Humidity        float64   `json:"humidity"`
	Precipitation   float64   `json:"precipitation"`
	WindSpeed       float64   `json:"wind_speed"`
	WindDirection   int       `json:"wind_direction"`
	WeatherCode     string    `json:"weather_code"`
	Description     string    `json:"description"`
	IsSuitable      bool      `json:"is_suitable"`
	Recommendations string    `json:"recommendations"`
}

// OpenWeatherMapResponse represents API response from OpenWeatherMap
type OpenWeatherMapResponse struct {
	List []struct {
		Dt   int64 `json:"dt"`
		Main struct {
			Temp     float64 `json:"temp"`
			Humidity int     `json:"humidity"`
		} `json:"main"`
		Weather []struct {
			ID          int    `json:"id"`
			Main        string `json:"main"`
			Description string `json:"description"`
		} `json:"weather"`
		Wind struct {
			Speed float64 `json:"speed"`
			Deg   int     `json:"deg"`
		} `json:"wind"`
		Rain struct {
			OneHour float64 `json:"1h"`
		} `json:"rain"`
		Snow struct {
			OneHour float64 `json:"1h"`
		} `json:"snow"`
	} `json:"list"`
}

// GetWeatherForecast handles GET /api/v1/facilities/:id/weather
func (wc *WeatherController) GetWeatherForecast(c *gin.Context) {
	facilityID := c.Param("id")

	// Get facility
	var facility models.Facility
	if err := wc.db.First(&facility, facilityID).Error; err != nil {
		c.JSON(404, gin.H{"error": "Facility not found"})
		return
	}

	// Only provide weather for outdoor facilities
	if !facility.IsOutdoor {
		c.JSON(400, gin.H{"error": "Weather data only available for outdoor facilities"})
		return
	}

	// Try to get cached weather data first
	var cachedWeather []models.WeatherCondition
	twoHoursAgo := time.Now().Add(-2 * time.Hour)

	if err := wc.db.Where("facility_id = ? AND created_at > ?", facilityID, twoHoursAgo).
		Order("date_time ASC").Find(&cachedWeather).Error; err == nil && len(cachedWeather) > 0 {

		var responses []WeatherResponse
		for _, weather := range cachedWeather {
			responses = append(responses, WeatherResponse{
				DateTime:        weather.DateTime,
				Temperature:     weather.Temperature,
				Humidity:        weather.Humidity,
				Precipitation:   weather.Precipitation,
				WindSpeed:       weather.WindSpeed,
				WindDirection:   weather.WindDirection,
				WeatherCode:     weather.WeatherCode,
				Description:     weather.Description,
				IsSuitable:      weather.IsSuitable,
				Recommendations: weather.Recommendations,
			})
		}

		c.JSON(200, gin.H{"weather": responses})
		return
	}

	// Fetch fresh weather data if no recent cache
	if wc.apiKey == "" {
		c.JSON(503, gin.H{"error": "Weather service not configured"})
		return
	}

	// For demo purposes, return mock data if API key is not set
	// In production, you would call OpenWeatherMap API here
	mockWeather := wc.generateMockWeather(facility)

	// Cache the weather data
	for _, weather := range mockWeather {
		wc.db.Create(&models.WeatherCondition{
			FacilityID:      facility.ID,
			DateTime:        weather.DateTime,
			Temperature:     weather.Temperature,
			Humidity:        weather.Humidity,
			Precipitation:   weather.Precipitation,
			WindSpeed:       weather.WindSpeed,
			WindDirection:   weather.WindDirection,
			WeatherCode:     weather.WeatherCode,
			Description:     weather.Description,
			IsSuitable:      weather.IsSuitable,
			Recommendations: weather.Recommendations,
		})
	}

	c.JSON(200, gin.H{"weather": mockWeather})
}

// generateMockWeather creates sample weather data for demonstration
func (wc *WeatherController) generateMockWeather(facility models.Facility) []WeatherResponse {
	var weather []WeatherResponse
	now := time.Now()

	// Generate 5-day forecast
	for i := 0; i < 5; i++ {
		date := now.AddDate(0, 0, i)

		// Generate 3 time slots per day (morning, afternoon, evening)
		for _, hour := range []int{9, 15, 18} {
			dateTime := time.Date(date.Year(), date.Month(), date.Day(), hour, 0, 0, 0, date.Location())

			// Mock weather conditions
			temp := 15.0 + float64(i) + float64(hour/10)
			humidity := 60.0 + float64(i*5)
			windSpeed := 10.0 + float64(i)
			precipitation := 0.0
			isSuitable := true
			recommendations := "Dobré podmínky pro trénink"

			// Add some rain on random days
			if i == 2 && hour == 15 {
				precipitation = 5.0
				isSuitable = false
				recommendations = "Déšť - doporučeno přerušit trénink nebo přesunout dovnitř"
			}

			weather = append(weather, WeatherResponse{
				DateTime:        dateTime,
				Temperature:     temp,
				Humidity:        humidity,
				Precipitation:   precipitation,
				WindSpeed:       windSpeed,
				WindDirection:   180 + i*10,
				WeatherCode:     "800",
				Description:     "Jasno",
				IsSuitable:      isSuitable,
				Recommendations: recommendations,
			})
		}
	}

	return weather
}

// BookingCalendarController handles calendar view for bookings
type BookingCalendarController struct {
	db *gorm.DB
}

// NewBookingCalendarController creates a new booking calendar controller
func NewBookingCalendarController() *BookingCalendarController {
	return &BookingCalendarController{
		db: database.GetDB(),
	}
}

// CalendarEvent represents a calendar event
type CalendarEvent struct {
	ID           uint      `json:"id"`
	Title        string    `json:"title"`
	Start        time.Time `json:"start"`
	End          time.Time `json:"end"`
	Type         string    `json:"type"` // "booking", "maintenance", "unavailable"
	Status       string    `json:"status"`
	FacilityName string    `json:"facility_name"`
	UserEmail    string    `json:"user_email,omitempty"`
	Color        string    `json:"color"` // For calendar display
}

// GetCalendarEvents handles GET /api/v1/facilities/calendar
func (bcc *BookingCalendarController) GetCalendarEvents(c *gin.Context) {
	// Parse date range
	startDate := c.Query("start")
	endDate := c.Query("end")
	facilityID := c.Query("facility_id")

	if startDate == "" || endDate == "" {
		c.JSON(400, gin.H{"error": "start and end parameters are required"})
		return
	}

	start, err := time.Parse(time.RFC3339, startDate)
	if err != nil {
		c.JSON(400, gin.H{"error": "Invalid start date format"})
		return
	}

	end, err := time.Parse(time.RFC3339, endDate)
	if err != nil {
		c.JSON(400, gin.H{"error": "Invalid end date format"})
		return
	}

	var events []CalendarEvent

	// Get bookings
	var bookings []models.FacilityBooking
	bookingQuery := bcc.db.Preload("Facility").Preload("User").
		Where("start_time >= ? AND end_time <= ? AND status NOT IN (?, ?)",
			start, end, string(models.BookingStatusCancelled), string(models.BookingStatusNoShow))

	if facilityID != "" {
		bookingQuery = bookingQuery.Where("facility_id = ?", facilityID)
	}

	bookingQuery.Find(&bookings)

	for _, booking := range bookings {
		color := "#3B82F6" // Blue for confirmed bookings
		if booking.Status == models.BookingStatusPending {
			color = "#F59E0B" // Orange for pending
		}

		events = append(events, CalendarEvent{
			ID:           booking.ID,
			Title:        booking.Title,
			Start:        booking.StartTime,
			End:          booking.EndTime,
			Type:         "booking",
			Status:       string(booking.Status),
			FacilityName: booking.Facility.Name,
			UserEmail:    booking.User.Email,
			Color:        color,
		})
	}

	// Get maintenance
	var maintenance []models.FacilityMaintenance
	maintenanceQuery := bcc.db.Preload("Facility").
		Where("scheduled_date >= ? AND scheduled_date <= ? AND is_facility_unavailable = ?", start, end, true)

	if facilityID != "" {
		maintenanceQuery = maintenanceQuery.Where("facility_id = ?", facilityID)
	}

	maintenanceQuery.Find(&maintenance)

	for _, m := range maintenance {
		endTime := m.ScheduledDate.Add(time.Duration(m.EstimatedDuration) * time.Minute)

		events = append(events, CalendarEvent{
			ID:           m.ID,
			Title:        fmt.Sprintf("Údržba: %s", m.Title),
			Start:        *m.ScheduledDate,
			End:          endTime,
			Type:         "maintenance",
			Status:       m.Status,
			FacilityName: m.Facility.Name,
			Color:        "#EF4444", // Red for maintenance
		})
	}

	c.JSON(200, gin.H{"events": events})
}