<?php

namespace App\Database;

use Illuminate\Support\Facades\DB;

class UpdateMassive2
{

    /**
     *
     * update test as t set
     * column_a = c.column_a,
     * column_c = c.column_c
     * from (values
     * ('123', 1, '---'),
     * ('345', 2, '+++')
     * ) as c(column_b, column_a, column_c)
     * where c.column_b = t.column_b;
     *
     *
     * UPDATE transactions
     * SET updated_at = CASE id
     * WHEN 1 THEN '2019-01-15 10:00:00'::date
     * WHEN 2 THEN '2019-01-16 11:00:00'::date
     * WHEN 3 THEN '2019-01-17 12:00:00'::date
     * END
     * WHERE id IN (1, 2, 3);
     *
     * update transactions set updated_at = '2019-01-15 10:00:00' where id = 1
     * update transactions set updated_at = '2019-01-16 10:00:00' where id = 2
     * update transactions set updated_at = '2019-01-17 10:00:00' where id = 3
     *
     * @param string $table
     * @param string $primaryKeyName
     * @param $config
     *
     * Config:
     * [
     *  [
     *    "primary_key" => 200576
     *    "columns" => array:1 [
     *      "transactions_banks.coupon_code" => "2001462387"
     *     ]
     *  ]
     * ]
     *
     * @return void
     */
    public function apply(string $table, string $primaryKeyName, array $config): void
    {

        /**
         * update test as t set
         * column_a = c.column_a,
         * column_c = c.column_c
         * from (values
         * ('123', 1, '---'),
         * ('345', 2, '+++')
         * ) as c(column_b, column_a, column_c)
         * where c.column_b = t.column_b;
         *
         *
         * update transactions as t
         * set date  = c.date,
         *     value = c.value
         * from (
         *     values (1, '2023-01-05 00:00:00'::timestamp, 23.44),
         *                 (2, '2023-01-03 00:00:00'::timestamp, 23.44)
         *      ) as c(id, date, value)
         * where t.id = c.id;
         *
         */

        $valuesSqls = [];
        $columns = $config[0]['columns'];

        foreach ($config as $configItem) {
            $valuesSqls[] = vsprintf('(%s, %s)', [$configItem['primary_key'], implode(', ', $configItem['columns'])]);
        }
        
        $valuesSql = implode(', ', $valuesSqls);
        $setSqls = [];
        foreach ($columns as $columnName => $columnValue) {
            $setSqls[] = vsprintf('%s = a2.%s', [$columnName, $columnName]);
        }

        $setSql = implode(', ', $setSqls);

        $sql = vsprintf('update %s as a1 set %s from (values %s) as a2(%s, date, value) where a1.%s = a2.%s', [
            $table,
            $setSql,
            $valuesSql,
            $primaryKeyName,
            $primaryKeyName,
            $primaryKeyName,
        ]);

        DB::statement($sql);
    }
}