import { MigrationInterface, QueryRunner } from 'typeorm';

function quoteIdentifier(identifier: string): string {
  return `"${identifier.replaceAll('"', '""')}"`;
}

export class F67UserReusableSignature1790124600000 implements MigrationInterface {
  name = 'F67UserReusableSignature1790124600000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      CREATE TABLE user_signature_profiles (
        user_id uuid PRIMARY KEY,
        original_name varchar(255) NOT NULL,
        mime_type varchar(100) NOT NULL,
        size_bytes integer NOT NULL,
        image_sha256 char(64) NOT NULL,
        image_data bytea NOT NULL,
        updated_by uuid,
        created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        updated_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        CONSTRAINT chk_user_signature_profiles_png CHECK (mime_type='image/png'),
        CONSTRAINT chk_user_signature_profiles_size CHECK (
          size_bytes BETWEEN 1 AND 1048576
          AND OCTET_LENGTH(image_data)=size_bytes
        ),
        CONSTRAINT chk_user_signature_profiles_sha CHECK (
          image_sha256 ~ '^[0-9a-f]{64}$'
        ),
        CONSTRAINT fk_user_signature_profiles_user FOREIGN KEY (user_id)
          REFERENCES users(id) ON DELETE CASCADE,
        CONSTRAINT fk_user_signature_profiles_updated_by FOREIGN KEY (updated_by)
          REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    const appRole = process.env.DB_APP_USER;
    if (!appRole) throw new Error('Missing required environment variable: DB_APP_USER');
    const applicationRole = quoteIdentifier(appRole);
    await queryRunner.query(`
      GRANT SELECT, INSERT, UPDATE, DELETE
      ON TABLE user_signature_profiles
      TO ${applicationRole}
    `);
  }

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