package db

import (
	"gitlink.org.cn/cloudream/jcs-pub/client/types"
	"gorm.io/gorm/clause"
)

type ObjectBlockDB struct {
	*DB
}

func (db *DB) ObjectBlock() *ObjectBlockDB {
	return &ObjectBlockDB{DB: db}
}

func (db *ObjectBlockDB) GetByUserSpaceID(ctx SQLContext, spaceID types.UserSpaceID) ([]types.ObjectBlock, error) {
	var rets []types.ObjectBlock
	err := ctx.Table("ObjectBlock").Where("UserSpaceID = ?", spaceID).Find(&rets).Error
	return rets, err
}

func (db *ObjectBlockDB) BatchGetByObjectID(ctx SQLContext, objectIDs []types.ObjectID) ([]types.ObjectBlock, error) {
	if len(objectIDs) == 0 {
		return nil, nil
	}

	var blocks []types.ObjectBlock
	err := ctx.Table("ObjectBlock").Where("ObjectID IN (?)", objectIDs).Order("ObjectID, `Index` ASC").Find(&blocks).Error
	return blocks, err
}

func (*ObjectBlockDB) GetInPackageID(ctx SQLContext, packageID types.PackageID) ([]types.ObjectBlock, error) {
	var rets []types.ObjectBlock
	err := ctx.Table("ObjectBlock").
		Joins("INNER JOIN Object ON ObjectBlock.ObjectID = Object.ObjectID").
		Where("Object.PackageID = ?", packageID).
		Order("ObjectBlock.ObjectID, ObjectBlock.`Index` ASC").
		Find(&rets).Error
	return rets, err
}

func (db *ObjectBlockDB) Create(ctx SQLContext, objectID types.ObjectID, index int, spaceID types.UserSpaceID, fileHash types.FileHash, size int64) error {
	block := types.ObjectBlock{ObjectID: objectID, Index: index, UserSpaceID: spaceID, FileHash: fileHash, Size: size}
	return ctx.Table("ObjectBlock").Create(&block).Error
}

func (db *ObjectBlockDB) BatchCreate(ctx SQLContext, blocks []types.ObjectBlock) error {
	if len(blocks) == 0 {
		return nil
	}

	return ctx.Clauses(clause.Insert{Modifier: "ignore"}).Create(&blocks).Error
}

func (db *ObjectBlockDB) DeleteByObjectID(ctx SQLContext, objectID types.ObjectID) error {
	return ctx.Table("ObjectBlock").Where("ObjectID = ?", objectID).Delete(&types.ObjectBlock{}).Error
}

func (db *ObjectBlockDB) DeleteByObjectIDIndex(ctx SQLContext, objectID types.ObjectID, index int) error {
	return ctx.Table("ObjectBlock").Where("ObjectID = ? AND `Index` = ?", objectID, index).Delete(&types.ObjectBlock{}).Error
}

func (db *ObjectBlockDB) BatchDeleteByObjectID(ctx SQLContext, objectIDs []types.ObjectID) error {
	if len(objectIDs) == 0 {
		return nil
	}

	return ctx.Table("ObjectBlock").Where("ObjectID IN (?)", objectIDs).Delete(&types.ObjectBlock{}).Error
}

func (db *ObjectBlockDB) DeleteInPackage(ctx SQLContext, packageID types.PackageID) error {
	return ctx.Table("ObjectBlock").Where("ObjectID IN (SELECT ObjectID FROM Object WHERE PackageID = ?)", packageID).Delete(&types.ObjectBlock{}).Error
}

func (db *ObjectBlockDB) BatchDeleteByFileHash(ctx SQLContext, spaceID types.UserSpaceID, fileHashes []types.FileHash) error {
	if len(fileHashes) == 0 {
		return nil
	}

	return ctx.Table("ObjectBlock").Where("UserSpaceID = ? AND FileHash IN (?)", spaceID, fileHashes).Delete(&types.ObjectBlock{}).Error
}

func (db *ObjectBlockDB) CountBlockWithHash(ctx SQLContext, fileHash string) (int, error) {
	var cnt int64
	err := ctx.Table("ObjectBlock").
		Select("COUNT(FileHash)").
		Joins("INNER JOIN Object ON ObjectBlock.ObjectID = Object.ObjectID").
		Joins("INNER JOIN Package ON Object.PackageID = Package.PackageID").
		Where("FileHash = ?", fileHash).
		Scan(&cnt).Error

	if err != nil {
		return 0, err
	}

	return int(cnt), nil
}