/*
 * Copyright 2020 Spotify AB
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// @ts-check

/**
 * @param {import('knex')} knex
 */
exports.up = function up(knex) {
  return knex.schema
    .raw('DROP VIEW location_update_log_latest;')
    .dropTable('location_update_log')
    .createTable('location_update_log', table => {
      table.bigIncrements('id').primary(); // instead of uuid, so we can MAX it
      table.enum('status', ['success', 'fail']).notNullable();
      table.dateTime('created_at').defaultTo(knex.fn.now()).notNullable();
      table.string('message');
      table
        .uuid('location_id')
        .references('id')
        .inTable('locations')
        .onUpdate('CASCADE')
        .onDelete('CASCADE');
      table.string('entity_name').nullable();
    }).raw(`
      CREATE VIEW location_update_log_latest AS
      SELECT t1.* FROM location_update_log t1
      JOIN
      (
        SELECT location_id, MAX(id) AS MAXID
        FROM location_update_log
        GROUP BY location_id
      ) t2
      ON t1.location_id = t2.location_id
      AND t1.id = t2.MAXID
      GROUP BY t1.location_id, t1.id
      ORDER BY created_at DESC;
    `);
};

/**
 * @param {import('knex')} knex
 */
exports.down = function down(knex) {
  return knex.schema
    .raw('DROP VIEW location_update_log_latest;')
    .dropTable('location_update_log')
    .createTable('location_update_log', table => {
      table.uuid('id').primary();
      table.enum('status', ['success', 'fail']).notNullable();
      table.dateTime('created_at').defaultTo(knex.fn.now()).notNullable();
      table.string('message');
      table
        .uuid('location_id')
        .references('id')
        .inTable('locations')
        .onUpdate('CASCADE')
        .onDelete('CASCADE');
      table.string('entity_name').nullable();
    }).raw(`
      CREATE VIEW location_update_log_latest AS
      SELECT t1.* FROM location_update_log t1
      JOIN
      (
        SELECT location_id, MAX(created_at) AS MAXDATE
        FROM location_update_log
        GROUP BY location_id
      ) t2
      ON t1.location_id = t2.location_id
      AND t1.created_at = t2.MAXDATE
      GROUP BY t1.location_id, t1.id
      ORDER BY created_at DESC;
    `);
};
