/**
 * DES1GN ADR D3 (§31): ImportDispatchPolicy — ren policy-funktion, testad per
 * kombination (format × bytes × rows, gränsvärden inkluderade), plus route-
 * kopplingen: rows > policy.maxRows -> 413 n0d_dispatch_required med hint
 * (descriptor-gate stängd), inline-taket oförändrat.
 */
import { describe, it, expect, vi, beforeEach } from "vitest";
import { NextRequest } from "next/server";
import { IMPORT_DISPATCH_POLICY, evaluateImportDispatch } from "@/lib/import-dispatch-policy";

describe("evaluateImportDispatch — verdict per kombination", () => {
  it("gränsvärde maxInlineRows: exakt 500 rader -> inline", () => {
    expect(evaluateImportDispatch({ format: "csv", bytes: 100, rows: IMPORT_DISPATCH_POLICY.maxInlineRows })).toEqual({ verdict: "inline" });
  });

  it("maxInlineRows < rows <= maxRows -> row_cap_exceeded (inline-taket, oförändrat)", () => {
    expect(evaluateImportDispatch({ format: "csv", bytes: 100, rows: IMPORT_DISPATCH_POLICY.maxInlineRows + 1 })).toEqual({
      verdict: "row_cap_exceeded",
      rows: 501,
      maxInlineRows: 500,
    });
    expect(evaluateImportDispatch({ format: "csv", bytes: 100, rows: IMPORT_DISPATCH_POLICY.maxRows }).verdict).toBe("row_cap_exceeded");
  });

  it("rows > maxRows -> dispatch_n0d (D3-signalen)", () => {
    expect(evaluateImportDispatch({ format: "csv", bytes: 100, rows: IMPORT_DISPATCH_POLICY.maxRows + 1 })).toEqual({
      verdict: "dispatch_n0d",
      rows: 5001,
      maxRows: 5000,
    });
  });

  it("bytes > maxBytes -> byte_cap_exceeded, oavsett rows", () => {
    expect(evaluateImportDispatch({ format: "csv", bytes: IMPORT_DISPATCH_POLICY.maxBytes + 1, rows: 1 }).verdict).toBe("byte_cap_exceeded");
    expect(evaluateImportDispatch({ format: "csv", bytes: IMPORT_DISPATCH_POLICY.maxBytes, rows: 1 }).verdict).toBe("inline");
  });

  it("format utanför allowlist -> unsupported_format", () => {
    expect(evaluateImportDispatch({ format: "xlsx", bytes: 10, rows: 1 })).toEqual({ verdict: "unsupported_format", format: "xlsx" });
  });

  it("precedens: format slår bytes, bytes slår rows", () => {
    expect(evaluateImportDispatch({ format: "json", bytes: 9e9, rows: 9e9 }).verdict).toBe("unsupported_format");
    expect(evaluateImportDispatch({ format: "csv", bytes: 9e9, rows: 9e9 }).verdict).toBe("byte_cap_exceeded");
  });
});

describe("route-koppling: POST /api/orders/import respekterar policyn", () => {
  const { requireOrderOwnerMock, createOrderMock, ingestEventMock, mockOwner } = vi.hoisted(() => ({
    requireOrderOwnerMock: vi.fn(),
    createOrderMock: vi.fn(),
    ingestEventMock: vi.fn().mockResolvedValue({}),
    mockOwner: { owner: { tenantId: "tenant-test", subject: "buyer-test" } },
  }));
  const _unused = mockOwner;
  vi.mock("@/src/auth/require-order-owner", () => ({
    requireOrderOwner: (...args: unknown[]) => requireOrderOwnerMock(...args),
  }));
  vi.mock("@/lib/orders-store", () => ({ createOrder: (...args: unknown[]) => createOrderMock(...args) }));
  vi.mock("@/src/clients/aud0-client", () => ({ createAud0Client: () => ({ ingestEvent: ingestEventMock }) }));

  let POST: typeof import("@/app/api/orders/import/route").POST;
  let MAX_IMPORT_ROWS: number;

  beforeEach(async () => {
    vi.clearAllMocks();
    requireOrderOwnerMock.mockResolvedValue(mockOwner);
    ({ POST, MAX_IMPORT_ROWS } = await import("@/app/api/orders/import/route"));
  });

  function postReq(csv: string): NextRequest {
    return new NextRequest(new URL("/api/orders/import", "http://localhost"), {
      method: "POST",
      body: JSON.stringify({ mode: "validate", csv }),
      headers: { "content-type": "application/json" },
    });
  }

  const line = "custom,icp,Bolag,10,Engångs,SE";

  it("exakt maxInlineRows rader -> 200 (inline-beteende oförändrat)", async () => {
    const csv = ["flow,service_type,type,volume,frequency,markets", ...Array.from({ length: MAX_IMPORT_ROWS }, () => line)].join("\n");
    const res = await POST(postReq(csv));
    expect(res.status).toBe(200);
  });

  it("maxRows < rows -> 413 n0d_dispatch_required med UNVERIFIED-hint, ingen skrivning", async () => {
    const csv = ["flow,service_type,type,volume,frequency,markets", ...Array.from({ length: IMPORT_DISPATCH_POLICY.maxRows + 1 }, () => line)].join("\n");
    const res = await POST(postReq(csv));
    expect(res.status).toBe(413);
    const body = (await res.json()) as { error: { code: string; hint: { capability_id: string; job_type: string; status: string } } };
    expect(body.error.code).toBe("n0d_dispatch_required");
    expect(body.error.hint).toEqual({ capability_id: "0pt.import_execute", job_type: "0pt.import_execute_job", status: "UNVERIFIED" });
    expect(createOrderMock).not.toHaveBeenCalled();
    expect(ingestEventMock).not.toHaveBeenCalled();
  });

  it("CSV > maxBytes -> 413 csv_too_large", async () => {
    const csv = "flow,service_type,type,volume,frequency,markets\n" + "x".repeat(IMPORT_DISPATCH_POLICY.maxBytes);
    const res = await POST(postReq(csv));
    expect(res.status).toBe(413);
    const body = (await res.json()) as { error: { code: string } };
    expect(body.error.code).toBe("csv_too_large");
  });
});