<?php

declare(strict_types=1);

namespace DoctrineMigrations;

use Doctrine\DBAL\Schema\Schema;
use Doctrine\Migrations\AbstractMigration;

final class Version20261120131000 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Normalize public schema identifiers to lowercase (tables + columns).';
    }

    public function up(Schema $schema): void
    {
        $this->addSql(<<<'SQL'
DO $$
DECLARE
    r RECORD;
BEGIN
    -- Special-case legacy table name from Prisma.
    IF EXISTS (
        SELECT 1 FROM information_schema.tables
        WHERE table_schema = 'public' AND table_name = 'ModelType'
    ) THEN
        EXECUTE 'ALTER TABLE public."ModelType" RENAME TO model_types';
    END IF;

    -- Rename columns containing uppercase letters.
    FOR r IN
        SELECT table_name, column_name
        FROM information_schema.columns
        WHERE table_schema = 'public' AND column_name ~ '[A-Z]'
    LOOP
        EXECUTE format(
            'ALTER TABLE public.%I RENAME COLUMN %I TO %I',
            r.table_name,
            r.column_name,
            lower(r.column_name)
        );
    END LOOP;

    -- Rename tables containing uppercase letters.
    FOR r IN
        SELECT table_name
        FROM information_schema.tables
        WHERE table_schema = 'public' AND table_name ~ '[A-Z]'
    LOOP
        EXECUTE format(
            'ALTER TABLE public.%I RENAME TO %I',
            r.table_name,
            lower(r.table_name)
        );
    END LOOP;
END $$;
SQL);
    }

    public function down(Schema $schema): void
    {
        // Irreversible: cannot restore original casing reliably.
    }
}