import { MigrationInterface, QueryRunner } from 'typeorm';

export class PhaseAAuditEvents1786548002000 implements MigrationInterface {
  name = 'PhaseAAuditEvents1786548002000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      CREATE TABLE audit_events (
        id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
        occurred_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        actor_user_id uuid,
        actor_username varchar(80),
        action varchar(100) NOT NULL,
        entity_type varchar(100),
        entity_id varchar(255),
        request_id varchar(128),
        source varchar(32) NOT NULL,
        ip inet,
        user_agent text,
        before_data jsonb,
        after_data jsonb,
        metadata jsonb,
        CONSTRAINT fk_audit_events_actor_user
          FOREIGN KEY (actor_user_id) REFERENCES users(id) ON DELETE SET NULL,
        CONSTRAINT chk_audit_events_json_objects
          CHECK (
            (before_data IS NULL OR jsonb_typeof(before_data) = 'object') AND
            (after_data IS NULL OR jsonb_typeof(after_data) = 'object') AND
            (metadata IS NULL OR jsonb_typeof(metadata) = 'object')
          )
      )
    `);

    await queryRunner.query(`
      CREATE INDEX idx_audit_events_occurred_at
      ON audit_events (occurred_at DESC)
    `);
    await queryRunner.query(`
      CREATE INDEX idx_audit_events_actor_user_id
      ON audit_events (actor_user_id)
    `);
    await queryRunner.query(`
      CREATE INDEX idx_audit_events_action ON audit_events (action)
    `);
    await queryRunner.query(`
      CREATE INDEX idx_audit_events_entity
      ON audit_events (entity_type, entity_id)
    `);
    await queryRunner.query(`
      CREATE INDEX idx_audit_events_request_id
      ON audit_events (request_id)
    `);
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query('DROP TABLE audit_events');
  }
}