package service

import (
	"errors"

	"affiliate_dash/internal/model"

	"gorm.io/gorm"
)

type SkinService struct {
	db *gorm.DB
}

func NewSkinService(db *gorm.DB) *SkinService {
	return &SkinService{db: db}
}

type SkinListQuery struct {
	Page     int
	Size     int
	Keyword  string
	Game     string
	Category string
	Status   *int
}

func (s *SkinService) List(q SkinListQuery) ([]model.Skin, int64, error) {
	if q.Page < 1 {
		q.Page = 1
	}
	if q.Size < 1 || q.Size > 100 {
		q.Size = 20
	}
	tx := s.db.Model(&model.Skin{})
	if q.Keyword != "" {
		tx = tx.Where("name LIKE ?", "%"+q.Keyword+"%")
	}
	if q.Game != "" {
		tx = tx.Where("game = ?", q.Game)
	}
	if q.Category != "" {
		tx = tx.Where("category = ?", q.Category)
	}
	if q.Status != nil {
		tx = tx.Where("status = ?", *q.Status)
	}
	var total int64
	if err := tx.Count(&total).Error; err != nil {
		return nil, 0, err
	}
	var list []model.Skin
	err := tx.Order("id DESC").Offset((q.Page - 1) * q.Size).Limit(q.Size).Find(&list).Error
	return list, total, err
}

func (s *SkinService) Get(id uint) (*model.Skin, error) {
	var skin model.Skin
	if err := s.db.First(&skin, id).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errors.New("皮肤不存在")
		}
		return nil, err
	}
	return &skin, nil
}

func (s *SkinService) Create(skin *model.Skin) error {
	return s.db.Create(skin).Error
}

func (s *SkinService) Update(id uint, updates map[string]interface{}) error {
	res := s.db.Model(&model.Skin{}).Where("id = ?", id).Updates(updates)
	if res.Error != nil {
		return res.Error
	}
	if res.RowsAffected == 0 {
		return errors.New("皮肤不存在")
	}
	return nil
}

func (s *SkinService) Delete(id uint) error {
	res := s.db.Delete(&model.Skin{}, id)
	if res.Error != nil {
		return res.Error
	}
	if res.RowsAffected == 0 {
		return errors.New("皮肤不存在")
	}
	return nil
}

func (s *SkinService) SeedDemo() error {
	var count int64
	s.db.Model(&model.Skin{}).Count(&count)
	if count > 0 {
		return nil
	}
	demos := []model.Skin{
		{Name: "龙之觉醒", Game: "王者荣耀", Category: "史诗", Price: 88, CostPrice: 50, Commission: 0.15, Stock: -1, Status: 1, Description: "史诗皮肤示例"},
		{Name: "星空旅人", Game: "和平精英", Category: "限定", Price: 128, CostPrice: 80, Commission: 0.12, Stock: 100, Status: 1, Description: "限定皮肤示例"},
		{Name: "暗夜骑士", Game: "英雄联盟", Category: "传说", Price: 199, CostPrice: 120, Commission: 0.10, Stock: 50, Status: 1, Description: "传说皮肤示例"},
	}
	return s.db.Create(&demos).Error
}