<?php

declare(strict_types=1);

namespace DoctrineMigrations;

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

final class Version20251114113000 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Normalize reviews: add album_id FK, backfill from albums.spotify_id';
    }

    public function up(Schema $schema): void
    {
        if (!$schema->hasTable('reviews')) {
            return;
        }
        $reviews = $schema->getTable('reviews');
        if ($reviews->hasColumn('album_id')) {
            // Already migrated (common for SQLite dev DBs)
            return;
        }

        if ($this->connection->getDatabasePlatform()->getName() === 'sqlite') {
            // SQLite cannot add FK constraints after table creation; add the column + index and rely on app-level validation.
            $this->addSql('ALTER TABLE reviews ADD COLUMN album_id INTEGER DEFAULT NULL');
            $this->addSql('CREATE INDEX IF NOT EXISTS IDX_6970EF78E0C31AF9 ON reviews (album_id)');
            $this->addSql('UPDATE reviews SET album_id = (SELECT a.id FROM albums a WHERE a.spotify_id = reviews.spotify_album_id) WHERE album_id IS NULL');
            return;
        }

        // Add nullable album_id first (PostgreSQL / others that support full DDL)
        $this->addSql('ALTER TABLE reviews ADD album_id INT DEFAULT NULL');
        $this->addSql('ALTER TABLE reviews ADD CONSTRAINT FK_6970EF78E0C31AF9 FOREIGN KEY (album_id) REFERENCES albums (id) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE');
        $this->addSql('CREATE INDEX IDX_6970EF78E0C31AF9 ON reviews (album_id)');

        // Backfill using existing spotify_album_id if both columns exist
        // Some environments may not have the legacy column; guard with DO blocks
        $this->addSql(<<<'SQL'
DO $$
BEGIN
  IF EXISTS (
    SELECT 1
    FROM information_schema.columns
    WHERE table_name='reviews' AND column_name='spotify_album_id'
  ) THEN
    UPDATE reviews r
    SET album_id = a.id
    FROM albums a
    WHERE a.spotify_id = r.spotify_album_id
      AND r.album_id IS NULL;
  END IF;
END $$;
SQL);

        // Optionally set NOT NULL if all rows are linked
        $this->addSql(<<<'SQL'
DO $$
BEGIN
  IF NOT EXISTS (SELECT 1 FROM reviews WHERE album_id IS NULL) THEN
    ALTER TABLE reviews ALTER COLUMN album_id SET NOT NULL;
  END IF;
END $$;
SQL);
    }

    public function down(Schema $schema): void
    {
        if (!$schema->hasTable('reviews')) {
            return;
        }
        $reviews = $schema->getTable('reviews');
        if (!$reviews->hasColumn('album_id')) {
            return;
        }

        if ($this->connection->getDatabasePlatform()->getName() === 'sqlite') {
            $this->addSql('DROP INDEX IF EXISTS IDX_6970EF78E0C31AF9');
            $this->addSql('ALTER TABLE reviews DROP COLUMN album_id');
            return;
        }

        $this->addSql('ALTER TABLE reviews DROP CONSTRAINT FK_6970EF78E0C31AF9');
        $this->addSql('DROP INDEX IF EXISTS IDX_6970EF78E0C31AF9');
        $this->addSql('ALTER TABLE reviews DROP COLUMN album_id');
    }
}