package dao

import (
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
	"vote-admin-api/api/model"
	"vote-admin-api/api/requests"
	"vote-admin-api/global"
)

type VideoDao struct {
}

// GetVideoById 获取数据-id
func (r *VideoDao) GetVideoById(VideoId int64) (m *model.Video, err error) {
	err = global.Db.First(&m, VideoId).Error
	if err != nil {
		return nil, err
	}
	return m, nil
}

// GetVideoPreloadById 获取数据-加载全部关联-id
func (r *VideoDao) GetVideoPreloadById(VideoId int64) (m *model.Video, err error) {
	err = global.Db.Preload(clause.Associations).First(&m, VideoId).Error
	if err != nil {
		return nil, err
	}
	return m, nil
}

// DeleteVideo 删除
func (r *VideoDao) DeleteVideo(tx *gorm.DB, maps interface{}) error {
	err := tx.Where(maps).Delete(&model.Video{}).Error
	if err != nil {
		return err
	}
	return nil
}

// DeleteVideoById 删除-id
func (r *VideoDao) DeleteVideoById(tx *gorm.DB, VideoId int64) error {
	if err := tx.Delete(&model.Video{}, VideoId).Error; err != nil {
		return err
	}
	return nil
}

// EditVideo 修改
func (r *VideoDao) EditVideo(tx *gorm.DB, maps interface{}, data interface{}) error {
	err := tx.Model(&model.Video{}).Where(maps).Updates(data).Error
	if err != nil {
		return err
	}
	return nil
}

// EditVideoById 修改-id
func (r *VideoDao) EditVideoById(tx *gorm.DB, VideoId int64, data interface{}) error {
	err := tx.Model(&model.Video{}).Where("video_id = ?", VideoId).Updates(data).Error
	if err != nil {
		return err
	}
	return nil
}

// GetVideoList 获取列表
func (r *VideoDao) GetVideoList(maps interface{}) (m []*model.Video, err error) {
	err = global.Db.Where(maps).Find(&m).Error
	if err != nil {
		return nil, err
	}
	return m, nil
}

// GetVideoCount 获取数量
func (r *VideoDao) GetVideoCount(maps interface{}) (total int64, err error) {
	err = global.Db.Model(&model.Video{}).Where(maps).Count(&total).Error
	if err != nil {
		return 0, err
	}
	return total, nil
}

// GetVideoListRand 获取列表-随机
func (r *VideoDao) GetVideoListRand(maps interface{}, limit int) (m []*model.Video, err error) {
	err = global.Db.Where(maps).Order("rand()").Limit(limit).Find(&m).Error
	if err != nil {
		return nil, err
	}
	return m, nil
}

// AddVideo 新增
func (r *VideoDao) AddVideo(tx *gorm.DB, model *model.Video) (*model.Video, error) {
	if err := tx.Create(model).Error; err != nil {
		return nil, err
	}
	return model, nil
}

// GetVideo 获取
func (r *VideoDao) GetVideo(maps interface{}) (m *model.Video, err error) {
	err = global.Db.Where(maps).First(&m).Error
	if err != nil {
		return nil, err
	}
	return m, nil
}

// Inc 自增
func (r *VideoDao) Inc(tx *gorm.DB, VideoId int64, field string, numeral int) error {
	err := tx.Model(&model.Video{}).Where("video_id = ?", VideoId).UpdateColumn(field, gorm.Expr(field+" + ?", numeral)).Error
	if err != nil {
		return err
	}
	return nil
}

// Dec 自减
func (r *VideoDao) Dec(tx *gorm.DB, VideoId int64, field string, numeral int) error {
	err := tx.Model(&model.Video{}).Where("video_id = ?", VideoId).UpdateColumn(field, gorm.Expr(field+" - ?", numeral)).Error
	if err != nil {
		return err
	}
	return nil
}

// GetVideoPageSearch 获取视频列表-分页
func (r *VideoDao) GetVideoPageSearch(req requests.GetVideoPage, page, pageSize int) (m []*model.Video, total int64, err error) {
	var totalRecords int64

	// 构建查询条件
	query := global.Db.Model(&model.Video{})

	// 作者
	query = query.Preload("VideoAuthor")

	// 作者关联医院
	query = query.Preload("VideoAuthor.BaseHospital")

	// 文章状态（1:正常 2:禁用）
	query = query.Where("video_status = ?", 1)

	// 搜索关键字
	if req.Keyword != "" {
		keyword := "%" + req.Keyword + "%" //

		// 标题
		orQuery := global.Db.Model(&model.Video{}).Or("video_title LIKE ?", keyword)

		// 医院名称
		hospitalSubQuery := global.Db.Model(&model.BaseHospital{}).
			Select("hospital_id").
			Where("hospital_name LIKE ?", keyword)

		articleAuthorSubQuery := global.Db.Model(&model.VideoAuthor{}).
			Select("video_id").
			Where(gorm.Expr("hospital_id IN (?)", hospitalSubQuery))

		orQuery = orQuery.Or(gorm.Expr("video_id IN (?)", articleAuthorSubQuery))

		// 作者姓名
		subQuery := global.Db.Model(&model.VideoAuthor{}).
			Select("video_id").
			Where("author_name LIKE ?", keyword)

		orQuery = orQuery.Or(gorm.Expr("video_id IN (?)", subQuery))

		// 执行组建
		query = query.Where(orQuery)
	}

	// 排序
	query = query.Order("created_at asc")

	// 查询总数量
	if err := query.Count(&totalRecords).Error; err != nil {
		return nil, 0, err
	}

	err = query.Scopes(model.Paginate(page, pageSize)).Find(&m).Error
	if err != nil {
		return nil, 0, err
	}
	return m, totalRecords, nil
}

// GetVideoOrderList 获取列表-排序
func (r *VideoDao) GetVideoOrderList(maps interface{}, orderField string, limit int) (m []*model.Video, err error) {
	err = global.Db.Where(maps).Preload(clause.Associations).Order(orderField).Limit(limit).Find(&m).Error
	if err != nil {
		return nil, err
	}
	return m, nil
}

// GetVideoRank 获取某一条数据的排名
func (r *VideoDao) GetVideoRank(videoID int64) (int, error) {
	var rank int

	// 定义子查询
	subQuery := global.Db.Model(&model.Video{}).
		Select("video_id, vote_num, (@rank := @rank + 1) AS rank").
		Where("video_status = ?", 1).
		Order("vote_num DESC").
		Joins(", (SELECT @rank := 0) AS r")

	// 将子查询作为命名子查询的一部分进行查询
	err := global.Db.Table("(?) AS sub", subQuery).
		Where("sub.video_id = ?", videoID).
		Pluck("sub.rank", &rank).Error

	if err != nil {
		return 0, err
	}

	return rank, nil
}