package database

import (
	"database/sql"
)

type ProductLocation struct {
	Id                    int
	CardtraderBlueprintId int
	StorageAreaId         int
	Position              int
	CardtraderProductId   int
}

func GetLastPositionInStorageArea(db *sql.DB, storageAreaId int) (int, error) {
	query := "SELECT Position FROM ProductLocation WHERE StorageAreaId = ? ORDER BY Position DESC LIMIT 1;"

	var lastPosition int
	err := db.QueryRow(query, storageAreaId).Scan(&lastPosition)

	if err == sql.ErrNoRows {
		return 0, nil
	} else if err != nil {
		return 0, err
	}

	return lastPosition, nil
}

func InsertProductLocation(db *sql.DB, productLocation ProductLocation) (int64, error) {
	query := `INSERT INTO ProductLocation
		(CardtraderBlueprintId, StorageAreaId, Position)
		VALUES (?, ?, ?);`

	insert, err := db.Prepare(query)
	if err != nil {
		return -1, err
	}

	result, err := insert.Exec(productLocation.CardtraderBlueprintId, productLocation.StorageAreaId, productLocation.Position)
	if err != nil {
		return -1, err
	}

	id, err := result.LastInsertId()
	if err != nil {
		return -1, err
	}

	return id, nil
}

func InsertProductInExistingLocation(db *sql.DB, productLocation ProductLocation) error {
	query := `UPDATE ProductLocation SET CardtraderBlueprintId = ? WHERE Id = ?;`

	update, err := db.Prepare(query)
	if err != nil {
		return err
	}

	_, err = update.Exec(productLocation.CardtraderBlueprintId, productLocation.Id)
	if err != nil {
		return err
	}

	return nil
}

func GetAllProductsInStorageArea(db *sql.DB, storageAreaId int) ([]ProductLocation, error) {
	var productLocations []ProductLocation

	query := `SELECT * FROM ProductLocation WHERE StorageAreaId = ?;`

	rows, err := db.Query(query)
	defer rows.Close()
	if err != nil {
		return productLocations, err
	}

	var productLocation ProductLocation
	for rows.Next() {
		err = rows.Scan(&productLocation.Id, &productLocation.CardtraderBlueprintId, &productLocation.StorageAreaId, &productLocation.Position, &productLocation.CardtraderProductId)
		if err != nil {
			return productLocations, err
		}

		productLocations = append(productLocations, productLocation)
	}

	return productLocations, nil
}