/**
 *  store - abstract class
 *
 *  @author Björn Hase <me@herr-hase.wtf>
 *  @license hhttps://www.gnu.org/licenses/gpl-3.0.en.html GPL-3
 *  @link https://git.node001.net/HerrHase/signpost.git
 *
 */

class Store {

    /**
     *
     *
     * @param {tableName}
     *
     */
    constructor(db, tableName) {
        this._db = db
        this._tableName = tableName
    }

    /**
     *  create row 
     *
     */
    findOneById(id) {
        return this.db
            .prepare('SELECT * FROM ' + this._tableName + ' WHERE id = ?')
            .run(id)
    }

    /**
     *  create row 
     *
     */
    remove(id) {
        this.db
            .prepare('DELETE FROM ' + this._tableName + ' WHERE id = ?')
            .run(id)
    }

    /**
     *
     *
     */
    update(id, data) {
        return this._db.prepare('UPDATE ' + this._tableName + ' SET ' + this._prepareUpdateBinding(data) + ' WHERE id = ?')
            .run(id, data)
    }

    /**
     *
     *
     */
    create(data) {
        return this._db.prepare('INSERT INTO ' + this._tableName + ' (' + Object.keys(data).join(', ') + ') VALUES (' + this._prepareInsertBinding(data) + ')')
            .run(data)
    }

    /**
     *  run through object and add key to string for
     *  binding parameters for insert
     *
     *  @param  {object} data
     *  @return {string}
     */
    _prepareInsertBinding(data) {
        let result = ''
        let length = Object.keys(data).length
        let index = 0

        for (const key in data) {
            result += '@' + key

            if (index++ < (length - 1)) {
                result += ', '
            }
        }

        return result
    }

    /**
     *  run through object and add key to string for
     *  binding parameters for update
     *
     *  @param  {object} data
     *  @return {string}
     */
    _prepareUpdateBinding(data) {
        let result = ''
        let length = Object.keys(data).length
        let index = 0

        for (const key in data) {
            result += key + ' = @' + key

            if (index++ < (length - 1)) {
                result += ', '
            }
        }

        return result
    }
}

export default Store