import { MigrationInterface, QueryRunner } from 'typeorm';

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

export class F62UserSmtpAndActRepresentative1790117400000 implements MigrationInterface {
  name = 'F62UserSmtpAndActRepresentative1790117400000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      DO $$
      BEGIN
        IF EXISTS (SELECT 1 FROM users WHERE email IS NULL OR btrim(email)='') THEN
          RAISE EXCEPTION 'USER_EMAIL_REQUIRED_BEFORE_F62';
        END IF;
      END $$
    `);
    await queryRunner.query(`ALTER TABLE users ALTER COLUMN email SET NOT NULL`);

    await queryRunner.query(`
      CREATE TABLE user_smtp_settings (
        user_id uuid PRIMARY KEY,
        mode varchar(16) NOT NULL DEFAULT 'SYSTEM',
        host varchar(255),
        port integer,
        security_mode varchar(24),
        username varchar(255),
        password_enc text,
        from_name varchar(200),
        from_email varchar(320),
        reply_to varchar(320),
        enabled boolean NOT NULL DEFAULT true,
        updated_by uuid,
        created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        updated_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
        CONSTRAINT chk_user_smtp_mode CHECK (mode IN ('SYSTEM','CUSTOM')),
        CONSTRAINT chk_user_smtp_security CHECK (security_mode IS NULL OR security_mode IN ('NONE','STARTTLS','TLS')),
        CONSTRAINT chk_user_smtp_port CHECK (port IS NULL OR (port > 0 AND port <= 65535)),
        CONSTRAINT chk_user_smtp_custom_complete CHECK (
          mode='SYSTEM' OR (
            LENGTH(TRIM(COALESCE(host,''))) > 0
            AND port IS NOT NULL
            AND security_mode IS NOT NULL
            AND LENGTH(TRIM(COALESCE(from_email,''))) > 0
          )
        ),
        CONSTRAINT fk_user_smtp_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
        CONSTRAINT fk_user_smtp_updated_by FOREIGN KEY (updated_by) REFERENCES users(id) ON DELETE SET NULL
      )
    `);
    await queryRunner.query(`
      ALTER TABLE inspection_act_responsibles
      DROP CONSTRAINT chk_inspection_act_responsibles_details
    `);
    await queryRunner.query(`
      ALTER TABLE inspection_act_responsibles
      ADD CONSTRAINT chk_inspection_act_responsibles_details CHECK (
        (
          attendance_status = 'PRESENT'
          AND LENGTH(TRIM(COALESCE(full_name, ''))) > 0
          AND document_type IS NOT NULL
          AND LENGTH(TRIM(COALESCE(document_number, ''))) > 0
          AND LENGTH(TRIM(COALESCE(position, ''))) > 0
          AND LENGTH(TRIM(COALESCE(email, ''))) > 0
          AND absence_reason IS NULL
        ) OR (
          attendance_status = 'ABSENT'
          AND LENGTH(TRIM(COALESCE(absence_reason, ''))) >= 10
        )
      )
    `);

    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 ON TABLE user_smtp_settings TO ${applicationRole}`);
    await queryRunner.query(`REVOKE DELETE ON TABLE user_smtp_settings FROM ${applicationRole}`);
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      ALTER TABLE inspection_act_responsibles
      DROP CONSTRAINT chk_inspection_act_responsibles_details
    `);
    await queryRunner.query(`
      ALTER TABLE inspection_act_responsibles
      ADD CONSTRAINT chk_inspection_act_responsibles_details CHECK (
        (
          attendance_status = 'PRESENT'
          AND LENGTH(TRIM(COALESCE(full_name, ''))) > 0
          AND document_type IS NOT NULL
          AND LENGTH(TRIM(COALESCE(document_number, ''))) > 0
          AND LENGTH(TRIM(COALESCE(position, ''))) > 0
          AND absence_reason IS NULL
        ) OR (
          attendance_status = 'ABSENT'
          AND LENGTH(TRIM(COALESCE(absence_reason, ''))) >= 10
        )
      )
    `);
    await queryRunner.query(`DROP TABLE IF EXISTS user_smtp_settings`);
    await queryRunner.query(`ALTER TABLE users ALTER COLUMN email DROP NOT NULL`);
  }
}