import { MigrationInterface, QueryRunner } from "typeorm";

/**
 * Editable customer-facing copy for the portal's public pages (/help, /faq,
 * /terms, /privacy) plus the shared support-contact block, with an append-only
 * version log behind it.
 *
 * `payload` is opaque jsonb: the five documents have genuinely different shapes
 * and the help page's blocks change with the copy, so typed columns would mean
 * a migration per wording tweak. The shape is enforced by per-slug DTOs on
 * write instead.
 *
 * No rows are inserted here — `SupportContentSeeder` fills the table on first
 * boot and skips whenever it is non-empty, so a redeploy never overwrites
 * admin edits the way a migration-embedded INSERT eventually would.
 */
export class SupportContent3350000000000 implements MigrationInterface {
  name = "SupportContent3350000000000";

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      CREATE TABLE IF NOT EXISTS freight.support_documents (
        id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
        slug varchar(32) NOT NULL,
        payload jsonb NOT NULL DEFAULT '{}'::jsonb,
        version integer NOT NULL DEFAULT 1,
        updated_by_id uuid,
        created_at timestamptz NOT NULL DEFAULT now(),
        updated_at timestamptz NOT NULL DEFAULT now(),
        deleted_at timestamptz
      );
    `);

    await queryRunner.query(`
      CREATE UNIQUE INDEX IF NOT EXISTS uq_support_documents_slug
        ON freight.support_documents (slug);
    `);

    await queryRunner.query(`
      CREATE TABLE IF NOT EXISTS freight.support_document_versions (
        id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
        document_id uuid NOT NULL
          REFERENCES freight.support_documents(id) ON DELETE CASCADE,
        version integer NOT NULL,
        payload jsonb NOT NULL,
        actor_id uuid,
        note varchar(255),
        created_at timestamptz NOT NULL DEFAULT now(),
        updated_at timestamptz NOT NULL DEFAULT now(),
        deleted_at timestamptz
      );
    `);

    // Closes the concurrent-save race: two editors saving at once cannot both
    // claim the same version number.
    await queryRunner.query(`
      CREATE UNIQUE INDEX IF NOT EXISTS uq_support_doc_version
        ON freight.support_document_versions (document_id, version);
    `);

    await queryRunner.query(`
      CREATE INDEX IF NOT EXISTS idx_support_doc_versions_document
        ON freight.support_document_versions (document_id);
    `);
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(
      `DROP TABLE IF EXISTS freight.support_document_versions;`,
    );
    await queryRunner.query(`DROP TABLE IF EXISTS freight.support_documents;`);
  }
}