import { MigrationInterface, QueryRunner } from "typeorm";

/**
 * Converts the HELP document from its original fixed-block shape
 * (`video` / `chat` / `channels` / `topics` / `checklist`) to the free-form
 * `sections[]` builder, where every block is a heading plus markdown plus
 * attached media.
 *
 * Only rows still in the old shape are touched — detected by the presence of a
 * `channels` key — so this is a no-op on any environment seeded after the
 * change, and re-running it does nothing.
 *
 * The payload literal is inlined rather than imported from
 * `SUPPORT_CONTENT_DEFAULTS`: a migration must keep doing the same thing
 * forever, and that constant will keep moving.
 *
 * The rewrite also bumps `version` and writes a matching history row. The live
 * row's version always having a matching entry in
 * `support_document_versions` is the invariant the history list and rollback
 * both depend on, and a silent payload swap would break it.
 */
const HELP_SECTIONS = [
  {
    id: "help-walkthrough",
    heading: "Portal walkthrough",
    body: "A guided tour of the portal — registering your company, raising a booking against a contract, and settling an invoice.",
    media: [
      {
        id: "help-walkthrough-video",
        kind: "video",
        src: "/assets/edr-portal-guide.webm",
        caption: null,
      },
    ],
  },
  {
    id: "help-chat",
    heading: "Chat with our team",
    body: "Signed-in customers can open a support conversation from the headset button at the bottom right of every portal page. You can send screenshots and documents in the chat, and replies appear there and as a notification.\n\n[Open the portal](/portal)",
    media: [],
  },
  {
    id: "help-contact",
    heading: "Contact us",
    body: "- **Email** — [{{supportEmail}}](mailto:{{supportEmail}}). Best for document issues and anything needing an attachment.\n- **Phone** — [{{supportPhone}}](tel:{{supportPhoneTel}}). Best for urgent problems with cargo already in transit.\n- **Head office** — {{supportOffice}}. Walk-in support during working hours.\n- **Support hours** — {{supportHours}}. Outside these hours, email us and we reply the next working day.",
    media: [],
  },
  {
    id: "help-topics",
    heading: "Common topics",
    body: "- **[Account & onboarding](/faq)** — registering your company, uploading your trade licence and TIN, and getting an operational profile approved.\n- **[Contracts](/faq)** — requesting a freight contract, reviewing its terms and signing it with your saved signature and stamp.\n- **[Bookings & tracking](/faq)** — raising a booking against a contract, adding last-mile transport and following the consignment along the corridor.\n- **[Invoices & payments](/faq)** — finding invoices, paying through the bank channels and confirming a payment that has not yet settled.",
    media: [],
  },
  {
    id: "help-checklist",
    heading: "What to include when you contact us",
    body: "- Your company name and the email you sign in with.\n- The reference of the contract, booking or invoice involved.\n- What you expected to happen and what happened instead.\n- A screenshot of any error message the portal showed.",
    media: [],
  },
];

export class SupportHelpSections3360000000000 implements MigrationInterface {
  name = "SupportHelpSections3360000000000";

  public async up(queryRunner: QueryRunner): Promise<void> {
    const rows: { id: string; version: number; payload: Record<string, unknown> }[] =
      await queryRunner.query(`
        SELECT id, version, payload
        FROM freight.support_documents
        WHERE slug = 'HELP' AND payload ? 'channels'
      `);

    for (const row of rows) {
      const payload = {
        title: row.payload.title ?? "Help & Support",
        subtitle:
          row.payload.subtitle ??
          "Get answers fast — watch the walkthrough, browse the common topics, check the FAQ, or reach our team directly.",
        sections: HELP_SECTIONS,
      };
      const version = row.version + 1;

      await queryRunner.query(
        `UPDATE freight.support_documents
         SET payload = $1::jsonb, version = $2, updated_at = now()
         WHERE id = $3`,
        [JSON.stringify(payload), version, row.id],
      );

      await queryRunner.query(
        `INSERT INTO freight.support_document_versions
           (document_id, version, payload, actor_id, note)
         VALUES ($1, $2, $3::jsonb, NULL, $4)`,
        [
          row.id,
          version,
          JSON.stringify(payload),
          "Converted help page to free-form sections",
        ],
      );
    }
  }

  /**
   * Not reversible: the old fixed blocks cannot be recovered from markdown
   * sections an editor may since have rewritten. The version history holds the
   * pre-conversion payload if it is ever genuinely needed.
   */
  public async down(): Promise<void> {
    // no-op
  }
}