/**
 * Spår C — @siax/collaboration-kernelns första produktkonsument:
 * /api/admin/order-notes (persisted collaboration state på admin-orders).
 *
 * Mönstret följer tests/api/anonymous-routes-auth.test.ts +
 * orders-idempotency.test.ts: route-handlers anropas direkt med handbyggda
 * NextRequest. Ingen DATABASE_URL i test-miljön => lib/order-notes-store.ts
 * faller tillbaka på sin dokumenterade in-memory-store (production vägrar
 * den vägen via resolveStoreMode — se lib/db.ts).
 */
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { NextRequest, NextResponse } from "next/server";

vi.mock("@/src/auth/require-route-auth", () => ({
  requireRouteAuth: vi.fn(),
}));
vi.mock("@/src/clients/aud0-client", () => ({
  createAud0Client: vi.fn(() => ({ ingestEvent: vi.fn().mockResolvedValue({}) })),
}));

import { requireRouteAuth } from "@/src/auth/require-route-auth";
import { createAud0Client } from "@/src/clients/aud0-client";
import { GET, PATCH, POST } from "@/app/api/admin/order-notes/route";
import { getOrder, createOrder } from "@/lib/orders-store";
import {
  addNote,
  listNotes,
  resetOrderNotesMemoryForTests,
} from "@/lib/order-notes-store";

const authed = { tenantId: "tenant-test", actorId: "admin-simon", requestId: "req-1" };

function mockAuth(ctx = authed) {
  vi.mocked(requireRouteAuth).mockResolvedValue({ ctx } as never);
}

function req(
  url: string,
  init: { method?: string; headers?: Record<string, string>; body?: string } = {},
): NextRequest {
  return new NextRequest(new URL(url, "http://localhost"), init);
}

function jsonReq(url: string, body: unknown, method = "POST"): NextRequest {
  return req(url, {
    method,
    headers: { "content-type": "application/json" },
    body: JSON.stringify(body),
  });
}

let orderId: string;

beforeEach(async () => {
  vi.mocked(requireRouteAuth).mockReset();
  vi.mocked(createAud0Client).mockClear();
  resetOrderNotesMemoryForTests();
  mockAuth();
  const created = await createOrder("custom", {
    markets: ["SE"],
    type: "Bolag",
    volume: 10,
  });
  orderId = created.order.order_id;
  // Legacy anonymous draft får annoteras av admin — men en tenant-ägd order
  // behöver token-match. Skapa därför testordern anonym (tenant null) och
  // testa tenant-guarden separat med en ägd order.
});

afterEach(() => {
  resetOrderNotesMemoryForTests();
});

describe("GET /api/admin/order-notes", () => {
  it("empty order -> 200 med tom lista (explicit empty behavior)", async () => {
    const res = await GET(req(`/api/admin/order-notes?order_id=${orderId}`));
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.notes).toEqual([]);
  });

  it("saknad order_id -> 400; okänd order -> 404", async () => {
    expect((await GET(req("/api/admin/order-notes"))).status).toBe(400);
    expect((await GET(req("/api/admin/order-notes?order_id=nope"))).status).toBe(404);
  });

  it("utan auth-svar från requireRouteAuth -> fail-closed (401), aldrig data", async () => {
    vi.mocked(requireRouteAuth).mockResolvedValueOnce({
      response: new NextResponse(null, { status: 401 }),
    } as never);
    const res = await GET(req(`/api/admin/order-notes?order_id=${orderId}`));
    expect(res.status).toBe(401);
  });
});

describe("POST + GET happy path (kernel-semantik)", () => {
  it("201 skapar noten, GET listar deterministiskt (Lamport-ordning, inte insättningsordning)", async () => {
    const r1 = await POST(jsonReq("/api/admin/order-notes", { order_id: orderId, body: "Första" }));
    expect(r1.status).toBe(201);
    const first = await r1.json();
    expect(first.version).toBe(1);
    expect(first.clock).toBe(1);

    const r2 = await POST(jsonReq("/api/admin/order-notes", { order_id: orderId, body: "Andra" }));
    expect(r2.status).toBe(201);

    const list = await (await GET(req(`/api/admin/order-notes?order_id=${orderId}`))).json();
    expect(list.notes).toHaveLength(2);
    // kernel mergeOperationLog: stigande (clock, actorId, id)
    const clocks = list.notes.map((n: { clock: number }) => n.clock);
    expect([...clocks].sort((a: number, b: number) => a - b)).toEqual(clocks);
    expect(list.notes[0].body).toBe("Första");

    // audit event emitterades via hostens AUD0-klient
    const ingest = vi.mocked(createAud0Client).mock.results.at(-1)?.value as {
      ingestEvent: ReturnType<typeof vi.fn>;
    };
    expect(ingest.ingestEvent).toHaveBeenCalled();
    const evt = ingest.ingestEvent.mock.calls[0][0];
    expect(evt.capability_id).toBe("admin.order_notes");
    expect(evt.event_type).toBe("order_note.created");
  });

  it("tom body -> 400 (server-authoritative validering)", async () => {
    const res = await POST(jsonReq("/api/admin/order-notes", { order_id: orderId, body: "   " }));
    expect(res.status).toBe(400);
  });

  it("tenant-guard: order tillhör annan tenant än token -> 403", async () => {
    const created = await createOrder("custom", { markets: ["SE"], volume: 5 }, undefined, {
      tenantId: "tenant-other",
      subject: "buyer-other",
    });
    const res = await POST(
      jsonReq("/api/admin/order-notes", { order_id: created.order.order_id, body: "hej" }),
    );
    expect(res.status).toBe(403);
    const body = await res.json();
    expect(body.error).toBe("OPT_ACCESS_DENIED");
  });
});

describe("PATCH — optimistisk samtidighet (conflict behavior)", () => {
  it("rätt version -> 200, version+1, klockan tickar (nextLamportClock)", async () => {
    const note = await addNote({ order_id: orderId, tenant_id: null, author_id: "a", body: "v1" });
    const res = await PATCH(
      jsonReq("/api/admin/order-notes", { note_id: note.note_id, body: "v2", version: 1 }, "PATCH"),
    );
    expect(res.status).toBe(200);
    const updated = await res.json();
    expect(updated.body).toBe("v2");
    expect(updated.version).toBe(2);
    expect(updated.clock).toBe(note.clock + 1);
  });

  it("stale version -> 409 med aktuell version (multi-user semantics)", async () => {
    const note = await addNote({ order_id: orderId, tenant_id: null, author_id: "a", body: "v1" });
    await updateNoteViaApi(note.note_id, "v2 fran annan skribent"); // samtidig skribant -> v2
    const res = await PATCH(
      jsonReq("/api/admin/order-notes", { note_id: note.note_id, body: "v3 stale", version: 1 }, "PATCH"),
    );
    expect(res.status).toBe(409);
    const body = await res.json();
    expect(body.error).toBe("version_conflict");
    expect(body.current_version).toBe(2);
  });

  it("okänd note -> 404; ogiltig version -> 400", async () => {
    expect(
      (
        await PATCH(
          jsonReq(
            "/api/admin/order-notes",
            { note_id: "note_nope", body: "x", version: 1 },
            "PATCH",
          ),
        )
      ).status,
    ).toBe(404);
    const note = await addNote({ order_id: orderId, tenant_id: null, author_id: "a", body: "v1" });
    expect(
      (
        await PATCH(
          jsonReq(
            "/api/admin/order-notes",
            { note_id: note.note_id, body: "x", version: 1.5 },
            "PATCH",
          ),
        )
      ).status,
    ).toBe(400);
  });

  it("PATCH utan auth -> 401 fail-closed", async () => {
    vi.mocked(requireRouteAuth).mockResolvedValueOnce({
      response: new NextResponse(null, { status: 401 }),
    } as never);
    const res = await PATCH(
      jsonReq("/api/admin/order-notes", { note_id: "x", body: "x", version: 1 }, "PATCH"),
    );
    expect(res.status).toBe(401);
  });
});

async function updateNoteViaApi(noteId: string, body: string) {
  const res = await PATCH(jsonReq("/api/admin/order-notes", { note_id: noteId, body, version: 1 }, "PATCH"));
  expect(res.status).toBe(200);
  return res.json();
}

describe("kernel-återanvändning (capability, inte paket)", () => {
  it("listNotes är kernel-mergead: ordningen följer compareOperations (klocka -> actorId -> id), två listningar identiska", async () => {
    const a = await addNote({ order_id: orderId, tenant_id: null, author_id: "a", body: "A" });
    const b = await addNote({ order_id: orderId, tenant_id: null, author_id: "b", body: "B" });
    const first = await listNotes(orderId);
    const second = await listNotes(orderId);
    expect(second.map((n) => n.note_id)).toEqual(first.map((n) => n.note_id));
    // stigande klocka = deterministisk kernel-ordning, oberoende av minnes-mapens iteration
    expect(first.map((n) => n.clock)).toEqual([a.clock, b.clock].sort((x, y) => x - y));
    expect(first.map((n) => n.note_id)).toEqual([a.note_id, b.note_id]);
  });
});

// getOrder används i routen (server-authoritative tenant-uppslag) — håll
// importen levande så refaktorer inte tyst tappar guarden.
void getOrder;