<?php

declare(strict_types=1);

namespace DoctrineMigrations;

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

/**
 * Migration pour la table audit_log append-only.
 *
 * @see Story 1.7 - T1: Schema Event Store
 * @see FR90: Tracage actions sensibles
 * @see NFR-S7: Audit trail immutable
 */
final class Version20260203100000 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Create audit_log table with append-only constraints (Story 1.7)';
    }

    public function up(Schema $schema): void
    {
        // T1.1 & T1.2: Create audit_log table
        $this->addSql(<<<'SQL'
            CREATE TABLE audit_log (
                id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
                aggregate_type VARCHAR(255) NOT NULL,
                aggregate_id UUID,
                event_type VARCHAR(255) NOT NULL,
                payload JSONB NOT NULL,
                metadata JSONB NOT NULL,
                occurred_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
                sequence_number BIGSERIAL NOT NULL
            )
        SQL);

        // T1.4: Indexes for efficient querying
        $this->addSql("CREATE INDEX idx_audit_tenant ON audit_log((metadata->>'tenant_id'))");
        $this->addSql("CREATE INDEX idx_audit_user ON audit_log((metadata->>'user_id'))");
        $this->addSql('CREATE INDEX idx_audit_occurred ON audit_log(occurred_at)');
        $this->addSql('CREATE INDEX idx_audit_aggregate ON audit_log(aggregate_type, aggregate_id)');
        $this->addSql("CREATE INDEX idx_audit_correlation ON audit_log((metadata->>'correlation_id'))");
        $this->addSql('CREATE INDEX idx_audit_event_type ON audit_log(event_type)');

        // T1.3: Append-only constraints - prevent UPDATE and DELETE
        $this->addSql('CREATE RULE audit_no_update AS ON UPDATE TO audit_log DO INSTEAD NOTHING');
        $this->addSql('CREATE RULE audit_no_delete AS ON DELETE TO audit_log DO INSTEAD NOTHING');

        // Add comment to document the immutability constraint
        $this->addSql("COMMENT ON TABLE audit_log IS 'Append-only audit log table. UPDATE and DELETE operations are disabled via PostgreSQL rules for immutability (NFR-S7).'");
    }

    public function down(Schema $schema): void
    {
        // Drop rules first
        $this->addSql('DROP RULE IF EXISTS audit_no_update ON audit_log');
        $this->addSql('DROP RULE IF EXISTS audit_no_delete ON audit_log');

        // Drop table (indexes are dropped automatically)
        $this->addSql('DROP TABLE IF EXISTS audit_log');
    }
}