const createStorage = (opts)=>{
    const { db, tableName } = opts;
    const hasMigrationTable = ()=>db.getSchemaConnection().hasTable(tableName);
    const createMigrationTable = ()=>{
        return db.getSchemaConnection().createTable(tableName, (table)=>{
            table.increments('id');
            table.string('name');
            table.datetime('time', {
                useTz: false
            });
        });
    };
    return {
        async logMigration ({ name }) {
            await db.getConnection().insert({
                name,
                time: new Date()
            }).into(tableName);
        },
        async unlogMigration ({ name }) {
            await db.getConnection(tableName).del().where({
                name
            });
        },
        async executed () {
            if (!await hasMigrationTable()) {
                await createMigrationTable();
                return [];
            }
            const logs = await db.getConnection(tableName).select().from(tableName).orderBy('time');
            return logs.map((log)=>log.name);
        }
    };
};

export { createStorage };
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