package query

import (
	"git.artlef.fr/bibliomane/internal/dto"
	"git.artlef.fr/bibliomane/internal/fileutils"
	"git.artlef.fr/bibliomane/internal/model"
	"gorm.io/gorm"
)

func FetchBookGet(db *gorm.DB, userId uint, bookId uint64) (dto.BookGet, error) {
	var book dto.BookGet
	query := db.Model(&model.Book{})
	selectQueryString := "books.title, authors.name as author, authors.id as author_id, books.isbn, books.inventaire_id, books.open_library_id, books.summary, " +
		"user_books.review, user_books.rating, user_books.read, user_books.want_read, " +
		"DATE(user_books.start_read_date) as start_read_date, " +
		"DATE(user_books.end_read_date) AS end_read_date, " +
		selectStaticFilesPath()
	query = query.Select(selectQueryString)
	query = joinAuthors(query)
	query = query.Joins("left join user_books on (user_books.book_id = books.id and user_books.user_id = ?)", userId)
	query = joinStaticFiles(query)
	query = query.Where("books.id = ?", bookId)
	res := query.First(&book)
	return book, res.Error
}

func FetchReadUserBook(db *gorm.DB, userId uint, limit int, offset int) ([]dto.BookUserGetBook, error) {
	var books []dto.BookUserGetBook
	query := fetchReadUserBookQuery(db, userId)
	query = query.Limit(limit)
	query = query.Offset(offset)
	res := query.Find(&books)
	return books, res.Error
}

func FetchReadUserBookCount(db *gorm.DB, userId uint) (int64, error) {
	query := fetchReadUserBookQuery(db, userId)
	var count int64
	res := query.Count(&count)
	return count, res.Error
}

func FetchReadingUserBook(db *gorm.DB, userId uint, limit int, offset int) ([]dto.BookUserGetBook, error) {
	var books []dto.BookUserGetBook
	query := fetchReadingUserBookQuery(db, userId)
	query = query.Limit(limit)
	query = query.Offset(offset)
	res := query.Find(&books)
	return books, res.Error
}

func FetchReadingUserBookCount(db *gorm.DB, userId uint) (int64, error) {
	query := fetchReadingUserBookQuery(db, userId)
	var count int64
	res := query.Count(&count)
	return count, res.Error
}

func fetchReadUserBookQuery(db *gorm.DB, userId uint) *gorm.DB {
	query := fetchUserBookGet(db, userId)
	query = query.Where("user_books.read IS TRUE")
	return query
}
func fetchReadingUserBookQuery(db *gorm.DB, userId uint) *gorm.DB {
	query := fetchUserBookGet(db, userId)
	query = query.Where("user_books.start_read_date IS NOT NULL AND (user_books.read IS NULL OR user_books.read IS FALSE)")
	return query
}

func FetchWantReadUserBook(db *gorm.DB, userId uint, limit int, offset int) ([]dto.BookUserGetBook, error) {
	var books []dto.BookUserGetBook

	query := fetchWantReadUserBookQuery(db, userId)
	query = query.Limit(limit)
	query = query.Offset(offset)
	res := query.Find(&books)
	return books, res.Error
}

func FetchWantReadUserBookCount(db *gorm.DB, userId uint) (int64, error) {
	query := fetchWantReadUserBookQuery(db, userId)
	var count int64
	res := query.Count(&count)
	return count, res.Error
}

func fetchWantReadUserBookQuery(db *gorm.DB, userId uint) *gorm.DB {
	query := fetchUserBookGet(db, userId)
	query = query.Where("user_books.want_read IS TRUE")
	return query
}

func fetchUserBookGet(db *gorm.DB, userId uint) *gorm.DB {
	query := db.Model(&model.UserBook{})
	query = query.Select("books.id, books.title, authors.name as author, user_books.rating, user_books.read, user_books.want_read, " + selectStaticFilesPath())
	query = query.Joins("left join books on (books.id = user_books.book_id)")
	query = joinAuthors(query)
	query = joinStaticFiles(query)
	query = query.Where("user_id = ?", userId)
	return query
}

func selectStaticFilesPath() string {
	return "(CASE COALESCE(static_files.path, '') WHEN '' THEN '' ELSE concat('" + fileutils.GetWsLinkPrefix() + "', static_files.path) END) as CoverPath"
}

func joinAuthors(query *gorm.DB) *gorm.DB {
	return query.Joins("left join authors on (authors.id = books.author_id)")
}

func joinStaticFiles(query *gorm.DB) *gorm.DB {
	return query.Joins("left join static_files on (static_files.id = books.cover_id)")
}