package services

import (
	"time"

	"attune-heart-therapy/internal/models"

	"github.com/stripe/stripe-go/v76"
)

// UserService handles user-related operations
type UserService interface {
	Register(req RegisterRequest) (*models.User, error)
	Login(email, password string) (*models.User, string, error) // returns user and JWT token
	GetProfile(userID uint) (*models.User, error)
	UpdateProfile(userID uint, req UpdateProfileRequest) (*models.User, error)
	CreateAdmin(req CreateAdminRequest) (*models.User, error)
}

// BookingService handles booking operations
type BookingService interface {
	GetAvailableSlots(date time.Time) ([]models.Schedule, error)
	CreateBooking(userID uint, req BookingRequest) (*models.Booking, error)
	GetUserBookings(userID uint) ([]models.Booking, error)
	CancelBooking(userID, bookingID uint) error
	RescheduleBooking(userID, bookingID uint, newScheduleID uint) error
}

// PaymentService handles Stripe integration
type PaymentService interface {
	CreatePaymentIntent(amount float64, currency string) (*stripe.PaymentIntent, error)
	ConfirmPayment(paymentIntentID string) (*stripe.PaymentIntent, error)
	HandleWebhook(payload []byte, signature string) error
}

// NotificationService handles email notifications
type NotificationService interface {
	SendWelcomeEmail(user *models.User) error
	SendPaymentNotification(user *models.User, booking *models.Booking, success bool) error
	SendMeetingInfo(user *models.User, booking *models.Booking) error
	SendReminder(user *models.User, booking *models.Booking) error
	ScheduleReminder(bookingID uint, reminderTime time.Time) error
	ProcessPendingNotifications() error
}

// JitsiService handles video conference integration
type JitsiService interface {
	CreateMeeting(bookingID uint, scheduledAt time.Time) (*JitsiMeeting, error)
	GetMeetingURL(roomID string) string
	DeleteMeeting(roomID string) error
}

// AdminService handles admin dashboard operations
type AdminService interface {
	GetDashboardStats() (*DashboardStats, error)
	GetFinancialReports(startDate, endDate time.Time) (*FinancialReport, error)
	CreateSchedule(req CreateScheduleRequest) (*models.Schedule, error)
	UpdateSchedule(scheduleID uint, req UpdateScheduleRequest) (*models.Schedule, error)
	GetAllUsers(limit, offset int) ([]models.User, int64, error)
	GetAllBookings(limit, offset int) ([]models.Booking, int64, error)
}

// JobManagerService handles background job operations
type JobManagerService interface {
	Start() error
	Stop() error
	IsRunning() bool
	ScheduleRemindersForBooking(bookingID uint, userID uint, meetingTime time.Time) error
	CancelRemindersForBooking(bookingID uint) error
}

// JitsiMeeting represents a Jitsi meeting
type JitsiMeeting struct {
	RoomID  string `json:"room_id"`
	RoomURL string `json:"room_url"`
}

// Request/Response DTOs
type RegisterRequest struct {
	FirstName   string    `json:"first_name" binding:"required"`
	LastName    string    `json:"last_name" binding:"required"`
	Email       string    `json:"email" binding:"required,email"`
	Phone       string    `json:"phone"`
	Location    string    `json:"location"`
	DateOfBirth time.Time `json:"date_of_birth"`
	Password    string    `json:"password" binding:"required,min=6"`
}

type UpdateProfileRequest struct {
	FirstName   string    `json:"first_name"`
	LastName    string    `json:"last_name"`
	Phone       string    `json:"phone"`
	Location    string    `json:"location"`
	DateOfBirth time.Time `json:"date_of_birth"`
}

type BookingRequest struct {
	ScheduleID uint    `json:"schedule_id" binding:"required"`
	Notes      string  `json:"notes"`
	Amount     float64 `json:"amount" binding:"required"`
}

// Payment DTOs
type CreatePaymentIntentRequest struct {
	Amount   float64 `json:"amount" binding:"required,gt=0"`
	Currency string  `json:"currency"`
}

type ConfirmPaymentRequest struct {
	PaymentIntentID string `json:"payment_intent_id" binding:"required"`
}

// Admin DTOs
type DashboardStats struct {
	TotalUsers        int64   `json:"total_users"`
	ActiveUsers       int64   `json:"active_users"`
	TotalBookings     int64   `json:"total_bookings"`
	UpcomingBookings  int64   `json:"upcoming_bookings"`
	CompletedBookings int64   `json:"completed_bookings"`
	CancelledBookings int64   `json:"cancelled_bookings"`
	TotalRevenue      float64 `json:"total_revenue"`
	MonthlyRevenue    float64 `json:"monthly_revenue"`
}

type FinancialReport struct {
	StartDate        time.Time                 `json:"start_date"`
	EndDate          time.Time                 `json:"end_date"`
	TotalRevenue     float64                   `json:"total_revenue"`
	TotalBookings    int64                     `json:"total_bookings"`
	AverageBooking   float64                   `json:"average_booking"`
	DailyBreakdown   []DailyFinancialSummary   `json:"daily_breakdown"`
	MonthlyBreakdown []MonthlyFinancialSummary `json:"monthly_breakdown"`
}

type DailyFinancialSummary struct {
	Date     time.Time `json:"date"`
	Revenue  float64   `json:"revenue"`
	Bookings int64     `json:"bookings"`
}

type MonthlyFinancialSummary struct {
	Month    string  `json:"month"`
	Revenue  float64 `json:"revenue"`
	Bookings int64   `json:"bookings"`
}

type CreateScheduleRequest struct {
	StartTime   time.Time `json:"start_time" binding:"required"`
	EndTime     time.Time `json:"end_time" binding:"required"`
	MaxBookings int       `json:"max_bookings" binding:"required,min=1"`
}

type UpdateScheduleRequest struct {
	StartTime   *time.Time `json:"start_time"`
	EndTime     *time.Time `json:"end_time"`
	MaxBookings *int       `json:"max_bookings"`
	IsAvailable *bool      `json:"is_available"`
}

type CreateAdminRequest struct {
	FirstName string `json:"first_name" validate:"required,min=2,max=100"`
	LastName  string `json:"last_name" validate:"required,min=2,max=100"`
	Email     string `json:"email" validate:"required,email"`
	Password  string `json:"password" validate:"required,min=8"`
}