package services

import (
	"fmt"
	"log"
	"time"

	"attune-heart-therapy/internal/models"
	"attune-heart-therapy/internal/repositories"
)

// bookingService implements the BookingService interface
type bookingService struct {
	bookingRepo         repositories.BookingRepository
	scheduleRepo        repositories.ScheduleRepository
	userRepo            repositories.UserRepository
	jitsiService        JitsiService
	paymentService      PaymentService
	notificationService NotificationService
}

// NewBookingService creates a new instance of BookingService
func NewBookingService(
	bookingRepo repositories.BookingRepository,
	scheduleRepo repositories.ScheduleRepository,
	userRepo repositories.UserRepository,
	jitsiService JitsiService,
	paymentService PaymentService,
	notificationService NotificationService,
) BookingService {
	return &bookingService{
		bookingRepo:         bookingRepo,
		scheduleRepo:        scheduleRepo,
		userRepo:            userRepo,
		jitsiService:        jitsiService,
		paymentService:      paymentService,
		notificationService: notificationService,
	}
}

// GetAvailableSlots retrieves available time slots for a given date
func (s *bookingService) GetAvailableSlots(date time.Time) ([]models.Schedule, error) {
	slots, err := s.scheduleRepo.GetAvailable(date)
	if err != nil {
		log.Printf("Failed to get available slots for date %v: %v", date, err)
		return nil, fmt.Errorf("failed to get available slots: %w", err)
	}

	return slots, nil
}

// CreateBooking creates a new booking with Jitsi meeting integration
func (s *bookingService) CreateBooking(userID uint, req BookingRequest) (*models.Booking, error) {
	// Get the schedule to validate availability
	schedule, err := s.scheduleRepo.GetByID(req.ScheduleID)
	if err != nil {
		log.Printf("Failed to get schedule %d: %v", req.ScheduleID, err)
		return nil, fmt.Errorf("invalid schedule: %w", err)
	}

	// Check if the schedule is available
	if !schedule.IsAvailable || schedule.BookedCount >= schedule.MaxBookings {
		return nil, fmt.Errorf("schedule slot is not available")
	}

	// Create the booking record first (without Jitsi details)
	booking := &models.Booking{
		UserID:        userID,
		ScheduledAt:   schedule.StartTime,
		Duration:      60, // Default duration, can be made configurable
		Status:        models.BookingStatusScheduled,
		Amount:        req.Amount,
		Notes:         req.Notes,
		PaymentStatus: models.PaymentStatusPending,
	}

	// Save the booking to get an ID
	if err := s.bookingRepo.Create(booking); err != nil {
		log.Printf("Failed to create booking for user %d: %v", userID, err)
		return nil, fmt.Errorf("failed to create booking: %w", err)
	}

	// Create Jitsi meeting after successful booking creation
	jitsiMeeting, err := s.jitsiService.CreateMeeting(booking.ID, booking.ScheduledAt)
	if err != nil {
		log.Printf("Failed to create Jitsi meeting for booking %d: %v", booking.ID, err)
		// Don't fail the booking creation if Jitsi fails, but log the error
		// The meeting can be created later or manually
		log.Printf("Booking %d created without Jitsi meeting due to error: %v", booking.ID, err)
	} else {
		// Update booking with Jitsi meeting details
		booking.JitsiRoomID = jitsiMeeting.RoomID
		booking.JitsiRoomURL = jitsiMeeting.RoomURL

		if err := s.bookingRepo.Update(booking); err != nil {
			log.Printf("Failed to update booking %d with Jitsi details: %v", booking.ID, err)
			// Log error but don't fail the booking creation
		} else {
			log.Printf("Successfully created Jitsi meeting for booking %d: Room ID %s", booking.ID, jitsiMeeting.RoomID)
		}
	}

	// Increment the booked count for the schedule
	if err := s.scheduleRepo.IncrementBookedCount(req.ScheduleID); err != nil {
		log.Printf("Failed to increment booked count for schedule %d: %v", req.ScheduleID, err)
		// This is not critical, continue with the booking
	}

	// Send meeting information notification if Jitsi meeting was created successfully
	if booking.JitsiRoomID != "" && booking.JitsiRoomURL != "" {
		user, err := s.userRepo.GetByID(userID)
		if err != nil {
			log.Printf("Failed to get user %d for notification: %v", userID, err)
		} else {
			if err := s.notificationService.SendMeetingInfo(user, booking); err != nil {
				log.Printf("Failed to send meeting info notification to user %d: %v", userID, err)
			}
		}
	}

	return booking, nil
}

// GetUserBookings retrieves all bookings for a specific user
func (s *bookingService) GetUserBookings(userID uint) ([]models.Booking, error) {
	bookings, err := s.bookingRepo.GetByUserID(userID)
	if err != nil {
		log.Printf("Failed to get bookings for user %d: %v", userID, err)
		return nil, fmt.Errorf("failed to get user bookings: %w", err)
	}

	return bookings, nil
}

// CancelBooking cancels a booking and cleans up associated resources
func (s *bookingService) CancelBooking(userID, bookingID uint) error {
	// Get the booking to validate ownership and status
	booking, err := s.bookingRepo.GetByID(bookingID)
	if err != nil {
		log.Printf("Failed to get booking %d: %v", bookingID, err)
		return fmt.Errorf("booking not found: %w", err)
	}

	// Validate ownership
	if booking.UserID != userID {
		return fmt.Errorf("unauthorized: booking does not belong to user")
	}

	// Check if booking can be cancelled
	if !booking.CanBeCancelled() {
		return fmt.Errorf("booking cannot be cancelled")
	}

	// Update booking status
	booking.Status = models.BookingStatusCancelled

	if err := s.bookingRepo.Update(booking); err != nil {
		log.Printf("Failed to update booking %d status to cancelled: %v", bookingID, err)
		return fmt.Errorf("failed to cancel booking: %w", err)
	}

	// Clean up Jitsi meeting if it exists
	if booking.JitsiRoomID != "" {
		if err := s.jitsiService.DeleteMeeting(booking.JitsiRoomID); err != nil {
			log.Printf("Failed to delete Jitsi meeting %s for cancelled booking %d: %v",
				booking.JitsiRoomID, bookingID, err)
			// Don't fail the cancellation if Jitsi cleanup fails
		}
	}

	log.Printf("Successfully cancelled booking %d for user %d", bookingID, userID)
	return nil
}

// RescheduleBooking reschedules a booking to a new time slot
func (s *bookingService) RescheduleBooking(userID, bookingID uint, newScheduleID uint) error {
	// Get the existing booking
	booking, err := s.bookingRepo.GetByID(bookingID)
	if err != nil {
		log.Printf("Failed to get booking %d: %v", bookingID, err)
		return fmt.Errorf("booking not found: %w", err)
	}

	// Validate ownership
	if booking.UserID != userID {
		return fmt.Errorf("unauthorized: booking does not belong to user")
	}

	// Check if booking can be rescheduled
	if !booking.CanBeRescheduled() {
		return fmt.Errorf("booking cannot be rescheduled")
	}

	// Get the new schedule
	newSchedule, err := s.scheduleRepo.GetByID(newScheduleID)
	if err != nil {
		log.Printf("Failed to get new schedule %d: %v", newScheduleID, err)
		return fmt.Errorf("invalid new schedule: %w", err)
	}

	// Check if the new schedule is available
	if !newSchedule.IsAvailable || newSchedule.BookedCount >= newSchedule.MaxBookings {
		return fmt.Errorf("new schedule slot is not available")
	}

	// Clean up old Jitsi meeting
	if booking.JitsiRoomID != "" {
		if err := s.jitsiService.DeleteMeeting(booking.JitsiRoomID); err != nil {
			log.Printf("Failed to delete old Jitsi meeting %s: %v", booking.JitsiRoomID, err)
		}
	}

	// Create new Jitsi meeting
	jitsiMeeting, err := s.jitsiService.CreateMeeting(booking.ID, newSchedule.StartTime)
	if err != nil {
		log.Printf("Failed to create new Jitsi meeting for rescheduled booking %d: %v", bookingID, err)
		// Continue with rescheduling even if Jitsi fails
		booking.JitsiRoomID = ""
		booking.JitsiRoomURL = ""
	} else {
		booking.JitsiRoomID = jitsiMeeting.RoomID
		booking.JitsiRoomURL = jitsiMeeting.RoomURL
	}

	// Update booking with new schedule details
	booking.ScheduledAt = newSchedule.StartTime

	if err := s.bookingRepo.Update(booking); err != nil {
		log.Printf("Failed to update rescheduled booking %d: %v", bookingID, err)
		return fmt.Errorf("failed to reschedule booking: %w", err)
	}

	// Update schedule counts
	if err := s.scheduleRepo.IncrementBookedCount(newScheduleID); err != nil {
		log.Printf("Failed to increment booked count for new schedule %d: %v", newScheduleID, err)
	}

	log.Printf("Successfully rescheduled booking %d for user %d to schedule %d", bookingID, userID, newScheduleID)
	return nil
}