package service

import (
	"context"
	"errors"
	"fmt"
	"github.com/go-nunu/nunu-layout-advanced/internal/model"
	"github.com/go-nunu/nunu-layout-advanced/internal/repository"
	"gorm.io/gorm"
)

type GameShieldPublicIpService interface {
	GetGameShieldPublicIp(ctx context.Context, id int64) (*model.GameShieldPublicIp, error)
	GetGameShieldPublicUserIp(ctx context.Context, uid int) (string, error)
	AddGameShieldPublicUserIp(ctx context.Context) (string, error)
	UpdateGameShieldPublicUserIp(ctx context.Context, uid int, ip string) error

	GetUserIp(ctx context.Context, uid int) (string, error)
}

func NewGameShieldPublicIpService(
	service *Service,
	gameShieldPublicIpRepository repository.GameShieldPublicIpRepository,
) GameShieldPublicIpService {
	return &gameShieldPublicIpService{
		Service:                      service,
		gameShieldPublicIpRepository: gameShieldPublicIpRepository,
	}
}

type gameShieldPublicIpService struct {
	*Service
	gameShieldPublicIpRepository repository.GameShieldPublicIpRepository
}

func (s *gameShieldPublicIpService) GetGameShieldPublicIp(ctx context.Context, id int64) (*model.GameShieldPublicIp, error) {
	return s.gameShieldPublicIpRepository.GetGameShieldPublicIp(ctx, id)
}

func (s *gameShieldPublicIpService) GetGameShieldPublicUserIp(ctx context.Context, uid int) (string, error) {
	ip, err := s.gameShieldPublicIpRepository.GetGameShieldPublicUserIp(ctx, uid)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return "", fmt.Errorf("该用户未绑定IP")
		}
		return "", err
	}
	return ip, nil
}

func (s *gameShieldPublicIpService) AddGameShieldPublicUserIp(ctx context.Context) (string, error) {
	ip, err := s.gameShieldPublicIpRepository.AddGameShieldPublicUserIp(ctx)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return "", fmt.Errorf("没有足够的IP: %w", err)
		}
		return "", err
	}
	return ip, nil
}

func (s *gameShieldPublicIpService) UpdateGameShieldPublicUserIp(ctx context.Context, uid int, ip string) error {
	if err := s.gameShieldPublicIpRepository.UpdateGameShieldPublicUserIp(ctx, uid, ip); err != nil {
		return err
	}
	return nil
}

func (s *gameShieldPublicIpService) GetUserIp(ctx context.Context, uid int) (string, error) {
	ip, err := s.GetGameShieldPublicUserIp(ctx, uid)
	if err == nil {
		return ip, nil
	}

	// 如果不是记录未找到，直接返回错误
	if !errors.Is(err, gorm.ErrRecordNotFound) {
		return "", err
	}

	// 分配新 IP（可能失败）
	ip, err = s.AddGameShieldPublicUserIp(ctx)
	if err != nil {
		return "", err
	}

	// 更新绑定关系
	if err := s.UpdateGameShieldPublicUserIp(ctx, uid, ip); err != nil {
		return "", err
	}
	return ip, nil
}