/**
 *  store - abstract class
 *
 *  @author Björn Hase <me@herr-hase.wtf>
 *  @license http://opensource.org/licenses/MIT The MIT License
 *  @link https://gitea.node001.net/HerrHase/urban-filehub.git
 *
 */

abstract class Store {

    protected db: string
    protected tableName: string 

    /**
     *
     *
     * @param {tableName}
     *
     */
    constructor(db: object, tableName?: string) {
        this.db = db
        this.tableName = tableName
    }

    /**
     *  create row 
     *
     */
    findOneById(id: integer): object {
        return this.db
            .query('SELECT * FROM ' + this.tableName + ' WHERE id = $id')
            .get({
                '$id': id
            })
    }

    /**
     *  create row 
     *
     */
    create(data: object): integer {
        this.db
            .query('INSERT INTO ' + this.tableName + ' (' + Object.keys(data).join(', ') + ') VALUES (' + this.prepareInsertBinding(data) + ')')
            .run(this.prepareData(data))

        return this.db.query('SELECT last_insert_rowid()').get()['last_insert_rowid()']
    }

    /**
     *  update row 
     *
     */
    update(id: integer, data: object): void {
        this.db
            .query('UPDATE ' + this.tableName + ' SET ' + this.prepareUpdateBinding(data) + ' WHERE id = $id')
            .run(this.prepareData(Object.assign(data, {
                'id': id
            })))
    }

    /**
     *  create row 
     *
     */
    remove(id: integer): remove {
        this.db
            .query('DELETE FROM ' + this.tableName + ' WHERE id = $id')
            .run({
                $id: id
            })
    }

    /**
     * 
     */
    prepareData(data: object) {
        const results = {}

        for (const key in data) {
            results['$' + key] = data[key]
        }

        return results
    }

    /**
     *  run through object and add key to string for
     *  binding parameters for insert
     *
     *  @param  {object} data
     *  @return {string}
     */
    prepareInsertBinding(data: array) {
        let result = []

        for (const key in data) {
            result.push('$' + key)
        }

        return result.join(', ')
    }

    /**
     *  run through object and add key to string for
     *  binding parameters for update
     *
     *  @param  {object} data
     *  @return {string}
     */
    prepareUpdateBinding(data: array) {
        let result = []

        for (const key in data) {
            result.push(key + ' = $' + key)
        }

        return result.join(', ')
    }
}

export default Store