package query

import (
	"strings"

	"git.artlef.fr/PersonalLibraryManager/internal/fileutils"
	"git.artlef.fr/PersonalLibraryManager/internal/model"
	"gorm.io/gorm"
)

type BookGet struct {
	Title     string `json:"title" binding:"required,max=300"`
	Author    string `json:"author" binding:"max=100"`
	Summary   string `json:"summary"`
	Rating    int    `json:"rating"`
	Read      bool   `json:"read"`
	WantRead  bool   `json:"wantread"`
	CoverPath string `json:"coverPath"`
}

func FetchBookGet(db *gorm.DB, userId uint, bookId uint64) (BookGet, error) {
	var book BookGet
	query := db.Model(&model.Book{})
	query = query.Select("books.title, books.author, books.summary, user_books.rating, user_books.read, user_books.want_read, " + selectStaticFilesPath())
	query = query.Joins("left join user_books on (user_books.book_id = books.id and user_books.user_id = ?)", userId)
	query = query.Joins("left join static_files on (static_files.id = books.cover_id)")
	query = query.Where("books.id = ?", bookId)
	res := query.First(&book)
	return book, res.Error
}

type BookSearchGet struct {
	Title     string `json:"title" binding:"required,max=300"`
	Author    string `json:"author" binding:"max=100"`
	ID        uint   `json:"id"`
	CoverPath string `json:"coverPath"`
}

func FetchBookSearchGet(db *gorm.DB, searchterm string) ([]BookSearchGet, error) {
	var books []BookSearchGet
	query := db.Model(&model.Book{})
	query = query.Select("books.title, books.author, books.id," + selectStaticFilesPath())
	query = query.Joins("left join static_files on (static_files.id = books.cover_id)")
	query = query.Where("LOWER(title) LIKE ?", "%"+strings.ToLower(searchterm)+"%")
	res := query.Find(&books)
	return books, res.Error
}

type BookUserGet struct {
	ID        uint   `json:"id"`
	Title     string `json:"title" binding:"required,max=300"`
	Author    string `json:"author" binding:"max=100"`
	Rating    int    `json:"rating" binding:"min=0,max=10"`
	Read      bool   `json:"read" binding:"boolean"`
	WantRead  bool   `json:"wantread" binding:"boolean"`
	CoverPath string `json:"coverPath"`
}

func FetchReadUserBook(db *gorm.DB, userId uint, limit int, offset int) ([]BookUserGet, error) {
	var books []BookUserGet
	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 fetchReadUserBookQuery(db *gorm.DB, userId uint) *gorm.DB {
	query := fetchUserBookGet(db, userId)
	query = query.Where("user_books.read IS TRUE")
	return query
}

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

	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, books.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 = query.Joins("left join static_files on (static_files.id = books.cover_id)")
	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"
}