/// <reference path="../pb_data/types.d.ts" />
/**
 * Proposal fields on `cards`.
 *
 * Plan Puzzle v1: clients drag a card into a month slot and we record their
 * intent on three nullable fields rather than overwriting `target_date`
 * (which the owner controls). The owner sees the chip, accepts (which copies
 * the proposal into `target_date`), or dismisses (which clears it).
 *
 * The three fields are written and cleared together. A row with one set and
 * the others null is logically incoherent; nothing in the application writes
 * one without the others. See src/app/actions/plan/client-proposal.ts and
 * src/app/actions/plan/owner-plan.ts for the only writers.
 *
 * The partial index supports the owner-side "show me cards with pending
 * proposals" query without indexing the millions of empty proposals on the
 * rest of the table.
 *
 * REFERENCE ONLY — see pb_migrations/README.md. scripts/setup-remote.ts is
 * what runs.
 */
migrate(
  (app) => {
    const cards = app.findCollectionByNameOrId("cards");
    const users = app.findCollectionByNameOrId("users");

    cards.fields.add([
      {
        name: "proposed_target_date",
        type: "date",
        required: false,
        presentable: false,
        hidden: false,
        system: false,
      },
      {
        name: "proposed_by",
        type: "relation",
        required: false,
        collectionId: users.id,
        cascadeDelete: false,
        minSelect: 0,
        maxSelect: 1,
        presentable: false,
        hidden: false,
        system: false,
      },
      {
        name: "proposed_at",
        type: "date",
        required: false,
        presentable: false,
        hidden: false,
        system: false,
      },
    ]);

    const existing = new Set((cards.indexes as string[]) ?? []);
    const proposalIndex =
      "CREATE INDEX idx_cards_proposal ON cards (proposed_target_date) WHERE proposed_target_date IS NOT NULL";
    if (!existing.has(proposalIndex)) {
      cards.indexes.push(proposalIndex);
    }

    return app.save(cards);
  },
  (app) => {
    const cards = app.findCollectionByNameOrId("cards");

    for (const name of [
      "proposed_target_date",
      "proposed_by",
      "proposed_at",
    ]) {
      const field = cards.fields.find((f) => f.name === name);
      if (field) cards.fields.removeById(field.id);
    }

    const indexes = (cards.indexes as string[]) ?? [];
    const proposalIndex =
      "CREATE INDEX idx_cards_proposal ON cards (proposed_target_date) WHERE proposed_target_date IS NOT NULL";
    cards.indexes = indexes.filter((i) => i !== proposalIndex);

    return app.save(cards);
  }
);