package service

import (
	"golang.org/x/crypto/bcrypt"

	"github.com/sundynix/pets-be/internal/model"
)

// AdminLogin 校验管理员账号密码。仅允许配置里指定的唯一管理员账号登录后台。
func (s *Service) AdminLogin(username, password string) (*model.Admin, error) {
	if username != s.cfg.Admin.Username {
		return nil, ErrNotFound
	}
	var admin model.Admin
	if err := s.db.Where("username = ?", username).First(&admin).Error; err != nil {
		return nil, ErrNotFound
	}
	if admin.Disabled {
		return nil, ErrNotFound
	}
	if err := bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(password)); err != nil {
		return nil, ErrNotFound
	}
	return &admin, nil
}

// GetAdmin 取管理员
func (s *Service) GetAdmin(id string) (*model.Admin, error) {
	var admin model.Admin
	if err := s.db.First(&admin, id).Error; err != nil {
		return nil, ErrNotFound
	}
	return &admin, nil
}

// AdminStats 后台统计
type AdminStats struct {
	Users   int64 `json:"users"`
	Pets    int64 `json:"pets"`
	Posts   int64 `json:"posts"`
	Records int64 `json:"records"`
}

// Stats Dashboard 计数
func (s *Service) Stats() (*AdminStats, error) {
	var st AdminStats
	s.db.Model(&model.User{}).Count(&st.Users)
	s.db.Model(&model.Pet{}).Count(&st.Pets)
	s.db.Model(&model.Post{}).Count(&st.Posts)
	s.db.Model(&model.HealthRecord{}).Count(&st.Records)
	return &st, nil
}

// ListUsers 用户分页（keyword 匹配昵称）
func (s *Service) ListUsers(keyword, userType string, offset, limit int) ([]model.User, int64, error) {
	q := s.db.Model(&model.User{})
	if keyword != "" {
		q = q.Where("nickname LIKE ?", "%"+keyword+"%")
	}
	switch userType {
	case "bot":
		q = q.Where("is_bot = ?", true)
	case "real":
		q = q.Where("is_bot IS NULL OR is_bot = ?", false)
	}
	var total int64
	q.Count(&total)
	var users []model.User
	err := q.Order("id desc").Offset(offset).Limit(limit).Find(&users).Error
	return users, total, err
}

// SetUserDisabled 启用/禁用用户
func (s *Service) SetUserDisabled(id string, disabled bool) error {
	if err := s.db.Model(&model.User{}).Where("id = ?", id).Update("disabled", disabled).Error; err != nil {
		return err
	}
	if disabled {
		// 顺手吊销刷新令牌，否则禁用后对方还能一直续期
		s.RevokeAllRefreshTokens("user", id)
	}
	return nil
}

// ListPetsAdmin 宠物分页
func (s *Service) ListPetsAdmin(offset, limit int) ([]model.Pet, int64, error) {
	var total int64
	s.db.Model(&model.Pet{}).Count(&total)
	var pets []model.Pet
	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&pets).Error
	return pets, total, err
}

// ListPostsAdmin 帖子分页（status 可选过滤）
func (s *Service) ListPostsAdmin(status string, offset, limit int) ([]model.Post, int64, error) {
	q := s.db.Model(&model.Post{})
	if status != "" {
		q = q.Where("status = ?", status)
	}
	var total int64
	q.Count(&total)
	var posts []model.Post
	err := q.Order("id desc").Offset(offset).Limit(limit).Find(&posts).Error
	return posts, total, err
}

// SetPostStatus 审核帖子（published/hidden/deleted）
func (s *Service) SetPostStatus(id string, status string) error {
	res := s.db.Model(&model.Post{}).Where("id = ?", id).Update("status", status)
	if res.Error != nil {
		return res.Error
	}
	if res.RowsAffected == 0 {
		return ErrNotFound
	}
	return nil
}

// ListCommentsAdmin 评论分页
func (s *Service) ListCommentsAdmin(offset, limit int) ([]model.Comment, int64, error) {
	var total int64
	s.db.Model(&model.Comment{}).Count(&total)
	var comments []model.Comment
	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&comments).Error
	return comments, total, err
}

// DeleteCommentAdmin 删除评论
func (s *Service) DeleteCommentAdmin(id string) error {
	return s.db.Model(&model.Comment{}).Where("id = ?", id).Update("status", "deleted").Error
}

// ListArticlesAdmin 文章分页（含未发布）
func (s *Service) ListArticlesAdmin(offset, limit int) ([]model.Article, int64, error) {
	var total int64
	s.db.Model(&model.Article{}).Count(&total)
	var articles []model.Article
	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&articles).Error
	return articles, total, err
}

// SaveArticle 新增或更新文章（ID 为 0 则新增）
func (s *Service) SaveArticle(a *model.Article) error {
	if a.ID == "" {
		return s.db.Create(a).Error
	}
	return s.db.Model(&model.Article{}).Where("id = ?", a.ID).Updates(map[string]any{
		"icon":               a.Icon,
		"title":              a.Title,
		"description":        a.Description,
		"content":            a.Content,
		"category":           a.Category,
		"related_sheet_type": a.RelatedSheetType,
		"published":          a.Published,
	}).Error
}

// DeleteArticle 删除文章
func (s *Service) DeleteArticle(id string) error {
	res := s.db.Delete(&model.Article{}, id)
	if res.Error != nil {
		return res.Error
	}
	if res.RowsAffected == 0 {
		return ErrNotFound
	}
	return nil
}

// ListProAdmin 会员分页
func (s *Service) ListProAdmin(offset, limit int) ([]model.ProMembership, int64, error) {
	var total int64
	s.db.Model(&model.ProMembership{}).Count(&total)
	var list []model.ProMembership
	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&list).Error
	return list, total, err
}