package dao

import (
	"context"
	"cms-api/internal/model"
)

// Create 创建附件
func (dao *AttachmentDao) Create(ctx context.Context, attachment *model.Attachment) (int64, error) {
	result, err := dao.Ctx(ctx).Data(attachment).Insert()
	if err != nil {
		return 0, err
	}
	id, err := result.LastInsertId()
	if err != nil {
		return 0, err
	}
	return id, nil
}

// GetById 根据ID获取附件
func (dao *AttachmentDao) GetById(ctx context.Context, id int) (*model.Attachment, error) {
	var attachment *model.Attachment
	err := dao.Ctx(ctx).Where(dao.Columns().Id, id).Scan(&attachment)
	if err != nil {
		return nil, err
	}
	return attachment, nil
}

// List 获取附件列表
func (dao *AttachmentDao) List(ctx context.Context, req *model.AttachmentListRequest) ([]*model.Attachment, int, error) {
	var (
		attachments []*model.Attachment
		total       int
		db          = dao.Ctx(ctx)
	)

	// 添加查询条件
	if req.FileType != "" {
		db = db.Where(dao.Columns().FileType, req.FileType)
	}
	if req.UploadedBy > 0 {
		db = db.Where(dao.Columns().UploadedBy, req.UploadedBy)
	}
	if req.StorageType != "" {
		db = db.Where(dao.Columns().StorageType, req.StorageType)
	}
	if req.Keyword != "" {
		db = db.Where(dao.Columns().OriginalName+" LIKE ? OR "+dao.Columns().FileName+" LIKE ?", "%"+req.Keyword+"%", "%"+req.Keyword+"%")
	}
	if req.StartDate != "" {
		db = db.Where(dao.Columns().CreatedAt+" >= ?", req.StartDate)
	}
	if req.EndDate != "" {
		db = db.Where(dao.Columns().CreatedAt+" <= ?", req.EndDate)
	}

	// 获取总数
	count, err := db.Count()
	if err != nil {
		return nil, 0, err
	}
	total = count

	// 分页查询
	offset := (req.Page - 1) * req.PageSize
	err = db.Order(dao.Columns().CreatedAt + " DESC").
		Limit(req.PageSize).
		Offset(offset).
		Scan(&attachments)
	if err != nil {
		return nil, 0, err
	}

	return attachments, total, nil
}

// Delete 删除附件
func (dao *AttachmentDao) Delete(ctx context.Context, id int) error {
	_, err := dao.Ctx(ctx).Where(dao.Columns().Id, id).Delete()
	return err
}

// IncrementUsageCount 增加使用次数
func (dao *AttachmentDao) IncrementUsageCount(ctx context.Context, id int) error {
	_, err := dao.Ctx(ctx).Where(dao.Columns().Id, id).Increment(dao.Columns().UsageCount, 1)
	return err
}

// GetCount 获取附件总数
func (dao *AttachmentDao) GetCount(ctx context.Context) (int, error) {
	count, err := dao.Ctx(ctx).Count()
	return count, err
}

// GetTotalSize 获取附件总大小
func (dao *AttachmentDao) GetTotalSize(ctx context.Context) (int64, error) {
	var totalSize int64
	err := dao.Ctx(ctx).Fields("SUM(" + dao.Columns().FileSize + ") as total_size").Scan(&totalSize)
	return totalSize, err
}

// GetCountByType 根据类型获取附件数量
func (dao *AttachmentDao) GetCountByType(ctx context.Context, fileType string) (int, error) {
	count, err := dao.Ctx(ctx).Where(dao.Columns().FileType, fileType).Count()
	return count, err
}

// BatchDelete 批量删除附件
func (dao *AttachmentDao) BatchDelete(ctx context.Context, ids []int) error {
	_, err := dao.Ctx(ctx).Where(dao.Columns().Id+" IN (?)", ids).Delete()
	return err
}

// GetByFileName 根据文件名获取附件
func (dao *AttachmentDao) GetByFileName(ctx context.Context, fileName string) (*model.Attachment, error) {
	var attachment *model.Attachment
	err := dao.Ctx(ctx).Where(dao.Columns().FileName, fileName).Scan(&attachment)
	if err != nil {
		return nil, err
	}
	return attachment, nil
}

// GetByUploader 根据上传者获取附件列表
func (dao *AttachmentDao) GetByUploader(ctx context.Context, uploaderId int, page, pageSize int) ([]*model.Attachment, int, error) {
	var (
		attachments []*model.Attachment
		total       int
		db          = dao.Ctx(ctx)
	)

	// 添加上传者条件
	db = db.Where(dao.Columns().UploadedBy, uploaderId)

	// 获取总数
	count, err := db.Count()
	if err != nil {
		return nil, 0, err
	}
	total = count

	// 分页查询
	offset := (page - 1) * pageSize
	err = db.Order(dao.Columns().CreatedAt + " DESC").
		Limit(pageSize).
		Offset(offset).
		Scan(&attachments)
	if err != nil {
		return nil, 0, err
	}

	return attachments, total, nil
}

// GetByIds 根据ID列表获取附件
func (dao *AttachmentDao) GetByIds(ctx context.Context, ids []int) ([]*model.Attachment, error) {
	var attachments []*model.Attachment
	err := dao.Ctx(ctx).Where(dao.Columns().Id+" IN (?)", ids).Scan(&attachments)
	if err != nil {
		return nil, err
	}
	return attachments, nil
}