package book

import (
	"github.com/flipped-aurora/gin-vue-admin/server/global"
	"github.com/flipped-aurora/gin-vue-admin/server/model/book"
	bookReq "github.com/flipped-aurora/gin-vue-admin/server/model/book/request"
	bookRes "github.com/flipped-aurora/gin-vue-admin/server/model/book/response"
	commonReq "github.com/flipped-aurora/gin-vue-admin/server/model/common/request"
	"gorm.io/gorm"
)

type BookAuthorRelationService struct{}

const bookAuthorRelationDisplaySelect = "bar.*, b.title AS book_title, ba.name AS author_name"

func (s *BookAuthorRelationService) CreateBookAuthorRelation(item book.BookAuthorRelation) error {
	item = applyBookAuthorRelationDefaults(item)
	if err := validateBookAuthorRelation(item); err != nil {
		return err
	}
	return global.GVA_DB.Create(&item).Error
}

func (s *BookAuthorRelationService) DeleteBookAuthorRelation(item book.BookAuthorRelation) error {
	return global.GVA_DB.Delete(&item).Error
}

func (s *BookAuthorRelationService) DeleteBookAuthorRelationByIds(ids commonReq.IdsReq) error {
	return deleteByIDs[book.BookAuthorRelation](ids.Ids)
}

func (s *BookAuthorRelationService) UpdateBookAuthorRelation(item book.BookAuthorRelation) error {
	if err := validateBookAuthorRelation(item); err != nil {
		return err
	}
	return global.GVA_DB.Save(&item).Error
}

func (s *BookAuthorRelationService) GetBookAuthorRelation(id uint) (item bookRes.BookAuthorRelationDisplay, err error) {
	err = bookAuthorRelationDisplayDB().
		Select(bookAuthorRelationDisplaySelect).
		Where("bar.id = ?", id).
		Take(&item).Error
	return
}

func (s *BookAuthorRelationService) GetBookAuthorRelationInfoList(info bookReq.BookAuthorRelationSearch) (list []bookRes.BookAuthorRelationListItem, total int64, err error) {
	db := bookAuthorRelationDisplayDB()
	if info.BookID != nil {
		db = db.Where("bar.book_id = ?", *info.BookID)
	}
	if info.AuthorID != nil {
		db = db.Where("bar.author_id = ?", *info.AuthorID)
	}
	err = db.Count(&total).Error
	if err != nil {
		return
	}
	err = db.Select(bookAuthorRelationDisplaySelect).
		Scopes(paginate(info.PageInfo)).
		Order("bar.book_id asc, bar.author_sort asc, bar.id desc").
		Scan(&list).Error
	return
}

func bookAuthorRelationDisplayDB() *gorm.DB {
	return global.GVA_DB.Table("book_author_relation AS bar").
		Joins("LEFT JOIN book AS b ON b.id = bar.book_id").
		Joins("LEFT JOIN book_author AS ba ON ba.id = bar.author_id")
}