package service

import (
	"context"
	"fmt"

	"apskel-pos-be/internal/contract"
	"apskel-pos-be/internal/models"
	"apskel-pos-be/internal/processor"
)

type CustomerAuthService interface {
	CheckPhoneNumber(ctx context.Context, req *contract.CheckPhoneRequest) (*models.CheckPhoneResponse, error)
	StartRegistration(ctx context.Context, req *contract.RegisterStartRequest) (*models.RegisterStartResponse, error)
	VerifyOtp(ctx context.Context, req *contract.RegisterVerifyOtpRequest) (*models.RegisterVerifyOtpResponse, error)
	SetPassword(ctx context.Context, req *contract.RegisterSetPasswordRequest) (*models.RegisterSetPasswordResponse, error)
	Login(ctx context.Context, req *contract.CustomerLoginRequest) (*models.CustomerLoginResponse, error)
	ResendOtp(ctx context.Context, req *contract.ResendOtpRequest) (*models.ResendOtpResponse, error)
}

type customerAuthService struct {
	customerAuthProcessor processor.CustomerAuthProcessor
}

func NewCustomerAuthService(customerAuthProcessor processor.CustomerAuthProcessor) CustomerAuthService {
	return &customerAuthService{
		customerAuthProcessor: customerAuthProcessor,
	}
}

func (s *customerAuthService) CheckPhoneNumber(ctx context.Context, req *contract.CheckPhoneRequest) (*models.CheckPhoneResponse, error) {
	// Validate request
	if req.PhoneNumber == "" {
		return nil, fmt.Errorf("phone number is required")
	}

	response, err := s.customerAuthProcessor.CheckPhoneNumber(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("failed to check phone number: %w", err)
	}

	return response, nil
}

func (s *customerAuthService) StartRegistration(ctx context.Context, req *contract.RegisterStartRequest) (*models.RegisterStartResponse, error) {
	// Validate request
	if req.PhoneNumber == "" {
		return nil, fmt.Errorf("phone number is required")
	}
	if req.Name == "" {
		return nil, fmt.Errorf("name is required")
	}
	if req.BirthDate == "" {
		return nil, fmt.Errorf("birth date is required")
	}

	response, err := s.customerAuthProcessor.StartRegistration(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("failed to start registration: %w", err)
	}

	return response, nil
}

func (s *customerAuthService) VerifyOtp(ctx context.Context, req *contract.RegisterVerifyOtpRequest) (*models.RegisterVerifyOtpResponse, error) {
	// Validate request
	if req.RegistrationToken == "" {
		return nil, fmt.Errorf("registration token is required")
	}
	if req.OtpCode == "" {
		return nil, fmt.Errorf("OTP code is required")
	}

	response, err := s.customerAuthProcessor.VerifyOtp(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("failed to verify OTP: %w", err)
	}

	return response, nil
}

func (s *customerAuthService) SetPassword(ctx context.Context, req *contract.RegisterSetPasswordRequest) (*models.RegisterSetPasswordResponse, error) {
	// Validate request
	if req.RegistrationToken == "" {
		return nil, fmt.Errorf("registration token is required")
	}
	if req.Password == "" {
		return nil, fmt.Errorf("password is required")
	}
	if req.ConfirmPassword == "" {
		return nil, fmt.Errorf("confirm password is required")
	}

	// Validate password strength
	if len(req.Password) < 8 {
		return nil, fmt.Errorf("password must be at least 8 characters long")
	}

	response, err := s.customerAuthProcessor.SetPassword(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("failed to set password: %w", err)
	}

	return response, nil
}

func (s *customerAuthService) Login(ctx context.Context, req *contract.CustomerLoginRequest) (*models.CustomerLoginResponse, error) {
	// Validate request
	if req.PhoneNumber == "" {
		return nil, fmt.Errorf("phone number is required")
	}
	if req.Password == "" {
		return nil, fmt.Errorf("password is required")
	}

	response, err := s.customerAuthProcessor.Login(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("failed to login: %w", err)
	}

	return response, nil
}

func (s *customerAuthService) ResendOtp(ctx context.Context, req *contract.ResendOtpRequest) (*models.ResendOtpResponse, error) {
	return s.customerAuthProcessor.ResendOtp(ctx, req)
}