package business

import (
	"context"
	"kra/internal/biz/business"
	"kra/internal/service/dto"
	"strings"
	"unicode/utf8"
)

type PasswordResetUsecase interface {
	Check(context.Context, string) (string, error)
	SendCode(context.Context, string) (string, error)
	VerifyCode(context.Context, string, string) (string, error)
	Reset(context.Context, string, string, string) error
}
type PasswordResetService struct{ uc PasswordResetUsecase }

func NewPasswordResetService(uc *business.PasswordResetUsecase) *PasswordResetService {
	return &PasswordResetService{uc: uc}
}
func resetUsername(req *dto.PasswordResetRequest) (string, error) {
	if req == nil || strings.TrimSpace(req.Username) == "" || utf8.RuneCountInString(req.Username) > 30 {
		return "", business.ErrAccountInput
	}
	return strings.TrimSpace(req.Username), nil
}
func (s *PasswordResetService) Check(ctx context.Context, req *dto.PasswordResetRequest) (*dto.PasswordResetPhoneResponse, error) {
	name, err := resetUsername(req)
	if err != nil {
		return nil, err
	}
	phone, err := s.uc.Check(ctx, name)
	if err != nil {
		return nil, err
	}
	return &dto.PasswordResetPhoneResponse{MaskedPhone: phone}, nil
}
func (s *PasswordResetService) SendCode(ctx context.Context, req *dto.PasswordResetRequest) (*dto.PasswordResetPhoneResponse, error) {
	name, err := resetUsername(req)
	if err != nil {
		return nil, err
	}
	phone, err := s.uc.SendCode(ctx, name)
	if err != nil {
		return nil, err
	}
	return &dto.PasswordResetPhoneResponse{MaskedPhone: phone}, nil
}
func (s *PasswordResetService) VerifyCode(ctx context.Context, req *dto.PasswordResetRequest) (*dto.PasswordResetTokenResponse, error) {
	name, err := resetUsername(req)
	if err != nil {
		return nil, err
	}
	if len(req.SMSCode) != 6 {
		return nil, business.ErrResetCode
	}
	token, err := s.uc.VerifyCode(ctx, name, req.SMSCode)
	if err != nil {
		return nil, err
	}
	return &dto.PasswordResetTokenResponse{ResetToken: token}, nil
}
func (s *PasswordResetService) Reset(ctx context.Context, req *dto.PasswordResetRequest) error {
	if req == nil || strings.TrimSpace(req.ResetToken) == "" || strings.TrimSpace(req.NewPassword) == "" || strings.TrimSpace(req.ConfirmPassword) == "" {
		return business.ErrAccountInput
	}
	if len(req.ResetToken) != 64 {
		return business.ErrResetToken
	}
	return s.uc.Reset(ctx, req.ResetToken, req.NewPassword, req.ConfirmPassword)
}