const { Model } = require('objection');
const { format } = require('date-fns');

class BaseModel extends Model {
    static get useLimitInFirst() {
        return true;
    }

    $beforeInsert() {
        super.$beforeInsert();
        if (this.constructor.hasColumn('created')) {
            this.created = this.constructor.mysqlTimestamp(false);
        }

        if (this.constructor.hasColumn('modified')) {
            this.modified = this.constructor.mysqlTimestamp(false);
        }
    }

    $beforeUpdate() {
        super.$beforeUpdate();

        if (this.constructor.hasColumn('modified')) {
            this.modified = this.constructor.mysqlTimestamp(false);
        }
    }

    static hasColumn(columnName) {
        if (this.jsonSchema &&
            this.jsonSchema.properties &&
            this.jsonSchema.properties[columnName]
        ) {
            return true;
        }
        return false;
    }


    static mysqlTimestamp(schemaDefinition = true) {
        const formattedDate = format(new Date(), 'yyyy-MM-dd HH:mm:ss');
        
        return schemaDefinition ? {
            type: 'string',
            default: formattedDate
        } : formattedDate;
    }
}

module.exports = BaseModel;