import "@/test-utils/named-admin-session";
import { beforeEach, describe, expect, it, vi } from "vitest";

const BATCH = "batch0000000001";
const NOTE = "note00000000001";
const SITE = "site00000000001";
const SUPPLIER = "supp00000000001";
const PO = "po0000000000001";
const ITEM = "poi000000000001";
const DELIVERY = "dn0000000000001";

const state = vi.hoisted(() => ({
  batch: {} as Record<string, unknown>,
  note: {} as Record<string, unknown>,
  delivery: {} as Record<string, unknown> | null,
  events: [] as Record<string, unknown>[],
  poItems: [] as Record<string, unknown>[],
  pages: [] as Record<string, unknown>[],
  auditFails: false,
  auditCollision: false,
  duplicateAtPostTime: null as Record<string, unknown> | null,
}));

vi.mock("@/lib/pb", () => ({ pbAdmin: vi.fn(async () => ({
  authStore: { token: "test" },
  files: { getURL: (_record: unknown, filename: string) => `https://pb.test/${filename}`, getToken: vi.fn(async () => "file-token") },
  collection(name: string) {
    if (name === "dn_batches") return { getOne: vi.fn(async () => state.batch) };
    if (name === "dn_batch_notes") return { getOne: vi.fn(async () => state.note) };
    if (name === "suppliers") return { getOne: vi.fn(async () => ({ id: SUPPLIER, name: "Supplier" })) };
    if (name === "purchase_orders") return { getOne: vi.fn(async () => ({ id: PO, site: SITE, supplier_ref: SUPPLIER })) };
    if (name === "purchase_order_items") return { getFullList: vi.fn(async () => state.poItems) };
    if (name === "dn_batch_pages") return { getFullList: vi.fn(async () => state.pages) };
    if (name === "delivery_notes") return {
      getOne: vi.fn(async () => state.delivery),
      getFirstListItem: vi.fn(async () => {
        if (state.duplicateAtPostTime) return state.duplicateAtPostTime;
        throw new Error("no rows");
      }),
    };
    if (name === "delivery_note_items") return { getFullList: vi.fn(async () => [{ id: "item-row" }]) };
    if (name === "dn_review_events") return {
      getFullList: vi.fn(async () => state.events),
      create: vi.fn(async (event: Record<string, unknown>) => {
        if (state.auditCollision) { state.events.push({ id: "winner", event_key: event.event_key, batch: BATCH, note: NOTE, action: "post", after: { delivery_note: DELIVERY } }); throw new Error("unique event key"); }
        if (state.auditFails) throw new Error("audit unavailable"); state.events.push(event); return { id: "event" };
      }),
    };
    throw new Error(`unexpected collection ${name}`);
  },
})) }));

const promoteNote = vi.hoisted(() => vi.fn(async () => ({ deliveryNoteId: DELIVERY, itemsCreated: 1 })));
vi.mock("@/lib/dn-pipeline/promote", () => ({ promoteNote }));

function request() { return new Request("http://localhost", { method: "POST" }); }
function context() { return { params: Promise.resolve({ id: BATCH, noteId: NOTE }) }; }

beforeEach(() => {
  state.batch = { id: BATCH, site: SITE, page_count: 1, assembly_revision: 3 };
  state.note = {
    id: NOTE, batch: BATCH, status: "candidate", stage: "ready_to_post", assembly_revision: 3,
    pages: [1], doc_number: "DN-1", delivery_note_number: "DN-1", supplier: SUPPLIER, purchase_order: PO,
    items: [{ description: "Aggregate", qty: 2, unit: "ton", purchase_order_item: ITEM }],
    checks: ["po_resolved", "product_matched", "units_convertible", "not_duplicate", "qty_plausible"].map((id) => ({ id, passed: true })),
  };
  state.delivery = null;
  state.events = [];
  state.auditFails = false;
  state.auditCollision = false;
  state.duplicateAtPostTime = null;
  state.poItems = [{ id: ITEM, purchase_order: PO, description: "Aggregate", unit: "ton", qty: 10, rate: 5 }];
  state.pages = [{ id: "page00000000001", image: "page.png", mime: "image/png", source_page: 1, region: 0, expand: { source: { ordinal: 0 } } }];
  promoteNote.mockClear();
  const png = Uint8Array.from(Buffer.from("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=", "base64"));
  vi.stubGlobal("fetch", vi.fn(async () => new Response(png, { status: 200 })));
});

describe("post delivery note route", () => {
  it("blocks a ready candidate while its batch still needs grouping confirmation", async () => {
    state.batch = { ...state.batch, stage: "split_review" };
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(409);
    expect((await response.json()).reasons).toContain("page_grouping_not_complete");
    expect(promoteNote).not.toHaveBeenCalled();
  });

  it("returns blocking reasons without promoting a needs-review candidate", async () => {
    state.note = { ...state.note, stage: "needs_review", purchase_order: "", checks: [] };
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(409);
    expect(await response.json()).toMatchObject({ error: "needs_review", reasons: ["candidate_not_ready_to_post"] });
    expect(promoteNote).not.toHaveBeenCalled();
  });

  it("promotes a ready candidate and records one posting audit", async () => {
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({ deliveryNoteId: DELIVERY, itemsCreated: 1, stage: "posted" });
    expect(promoteNote).toHaveBeenCalledOnce();
    expect(state.events).toHaveLength(1);
    expect(state.events[0]).toMatchObject({ action: "post", note: NOTE });
  });

  it("uses a PocketBase file token to fetch a protected candidate page", async () => {
    const png = Uint8Array.from(Buffer.from("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=", "base64"));
    vi.stubGlobal("fetch", vi.fn(async (input: string | URL | Request) =>
      String(input).includes("token=file-token")
        ? new Response(png, { status: 200 })
        : new Response(null, { status: 404 })));
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(vi.mocked(fetch).mock.calls[0]?.[0]).toBe("https://pb.test/page.png?token=file-token");
  });

  it("refuses to post when another delivery note with the same number was posted after this candidate's last rerun", async () => {
    // Two scans of one physical delivery can each pass not_duplicate and
    // reach ready_to_post before either is posted, because neither rerun
    // saw the other on the ledger yet. Without a fresh check right here,
    // both would post — the exact bug that let a real supplier get paid
    // twice for one delivery.
    state.duplicateAtPostTime = { id: "other-delivery-note", delivery_note_number: "DN-1" };
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(409);
    expect(await response.json()).toMatchObject({ error: "needs_review", reasons: ["duplicate_at_post_time:other-delivery-note"] });
    expect(promoteNote).not.toHaveBeenCalled();
  });

  it("reports an unlinked line as kind: none instead of a matched line with no PO item", async () => {
    // A free accessory (rubber rings shipped alongside priced pipe) is
    // deliberately left unlinked to any PO line. Reporting it as "matched"
    // with no poItem crashed promoteNote, which trusts kind === "matched"
    // to mean poItem is present.
    state.note = {
      ...state.note,
      items: [
        { description: "Pipe", qty: 11, unit: "ea", purchase_order_item: ITEM },
        { description: "Rubber rings", qty: 11, unit: "ea", purchase_order_item: "", unit_price: 0 },
      ],
      checks: (state.note.checks as { id: string; passed: boolean }[]).map((check) =>
        check.id === "product_matched"
          ? { ...check, detail: { freeAccessories: [{ lineIndex: 1 }] } }
          : check),
    };
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    const calls = promoteNote.mock.calls as unknown as { lineMatches: { match: { kind: string } }[] }[][];
    expect(calls[0]![0]!.lineMatches.map((m) => m.match.kind)).toEqual(["matched", "none"]);
  });

  it("uses exactly the candidate's non-first canonical page", async () => {
    state.batch = { ...state.batch, page_count: 2 };
    state.note = { ...state.note, pages: [2], page_from: 2, page_to: 2 };
    state.pages = [
      { id: "page00000000001", image: "first.png", mime: "image/png", source_page: 1, region: 0, expand: { source: { ordinal: 0 } } },
      { id: "page00000000002", image: "second.png", mime: "image/png", source_page: 2, region: 0, expand: { source: { ordinal: 0 } } },
    ];
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(vi.mocked(fetch)).toHaveBeenCalledTimes(1);
    expect(vi.mocked(fetch).mock.calls[0]?.[0]).toBe("https://pb.test/second.png?token=file-token");
  });

  it("selects an explicit global page after a missing middle page", async () => {
    state.batch = { ...state.batch, page_count: 3 };
    state.note = { ...state.note, pages: [3], page_from: 3, page_to: 3 };
    state.pages = [
      { id: "page00000000001", image: "first.png", mime: "image/png", source_page: 1, global_page: 1, region: 0, expand: { source: { ordinal: 0 } } },
      { id: "page00000000003", image: "third.png", mime: "image/png", source_page: 3, global_page: 3, region: 0, expand: { source: { ordinal: 0 } } },
    ];
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(vi.mocked(fetch).mock.calls[0]?.[0]).toBe("https://pb.test/third.png?token=file-token");
  });

  it("retries a real promotion instead of reporting success when a blocked candidate carries a dangling delivery_note pointer", async () => {
    // promoteNote deliberately links a failed candidate to its
    // partially-written delivery_notes row so the orphan stays visible —
    // but the candidate's own status/stage stay "blocked"/"needs_review".
    // Treating that pointer alone as proof of a finished posting skipped
    // promoteNote on retry and left the ledger with a delivery note that
    // has zero line items.
    state.note = { ...state.note, status: "blocked", stage: "ready_to_post", delivery_note: DELIVERY };
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({ deliveryNoteId: DELIVERY, itemsCreated: 1, stage: "posted" });
    expect(promoteNote).toHaveBeenCalledOnce();
  });

  it("returns the same delivery note on an idempotent retry", async () => {
    state.note = { ...state.note, status: "promoted", stage: "posted", delivery_note: DELIVERY };
    state.delivery = { id: DELIVERY, batch_note: NOTE, batch: BATCH, site: SITE, purchase_order: PO };
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({ deliveryNoteId: DELIVERY, itemsCreated: 1, stage: "posted" });
    expect(promoteNote).not.toHaveBeenCalled();
  });

  it("reports a truthful posted result when audit persistence is temporarily unavailable", async () => {
    state.auditFails = true;
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    const body = await response.json();
    expect(body).toMatchObject({ deliveryNoteId: DELIVERY, stage: "posted", auditPending: true });
    expect(body).not.toHaveProperty("error", "promotion_failed");
  });

  it("confirms a concurrent deterministic audit winner after create collision", async () => {
    state.auditCollision = true;
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({ deliveryNoteId: DELIVERY, itemsCreated: 1, stage: "posted" });
  });

  it("does not accept a deterministic audit key owned by another note", async () => {
    state.events = [{ id: "wrong", event_key: `dn-post:${NOTE}`, batch: BATCH, note: "note00000000002", action: "post" }];
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(await response.json()).toMatchObject({ stage: "posted", auditPending: true, auditError: "audit_key_collision" });
  });

  it("does not accept a same-note audit event pointing at another delivery note", async () => {
    state.events = [{ id: "wrong-dn", event_key: `dn-post:${NOTE}`, batch: BATCH, note: NOTE, action: "post", after: { delivery_note: "dn0000000000002" } }];
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(200);
    expect(await response.json()).toMatchObject({ stage: "posted", auditPending: true, auditError: "audit_key_collision" });
  });

  it("fails closed when a posted delivery note no longer matches its PO/site association", async () => {
    state.note = { ...state.note, status: "promoted", stage: "posted", delivery_note: DELIVERY };
    state.delivery = { id: DELIVERY, batch_note: NOTE, batch: BATCH, site: "site00000000002", purchase_order: PO };
    const { POST } = await import("./route");
    const response = await POST(request(), context());
    expect(response.status).toBe(409);
    expect(await response.json()).toMatchObject({ error: "posted_delivery_note_mismatch" });
  });
});