/**
 * Integration test for PO document upload + visibility (regression for the
 * "documents uploaded but not visible anywhere" report).
 *
 * Drives the real `uploadPoDocuments` server action against a real DB and asserts
 * that a `PODocument` row is created AND surfaced by the exact include the PO
 * detail page uses — i.e. the attachment is actually visible. Storage I/O
 * (`uploadBuffer`) is stubbed so the test doesn't depend on R2 / the filesystem;
 * the bug was the missing DB row, which is asserted here for real.
 */
import { vi, describe, it, expect, beforeAll, afterEach } from "vitest";

vi.mock("@/auth", () => ({ auth: vi.fn() }));
vi.mock("next/cache", () => ({ revalidatePath: vi.fn() }));
// Keep buildStorageKey real (it shapes the storage key the UI groups on); stub
// only the actual storage write so the test is hermetic.
vi.mock("@/lib/storage", async (importOriginal) => {
  const actual = await importOriginal<typeof import("@/lib/storage")>();
  return { ...actual, uploadBuffer: vi.fn().mockResolvedValue(undefined) };
});

import { auth } from "@/auth";
import { db } from "@/lib/db";
import { uploadBuffer } from "@/lib/storage";
import { createPo } from "@/app/(portal)/po/new/actions";
import { uploadPoDocuments } from "@/app/actions/upload-po-documents";
import { makeSession, getSeedUser, getSeedVessel, getSeedAccount, makePoForm, deletePosByTitle } from "./helpers";

const PREFIX = "INTTEST_PODOC_";
let submitterId: string;
let vesselId: string;
let accountId: string;

beforeAll(async () => {
  const [user, vessel, account] = await Promise.all([
    getSeedUser("manager@pelagia.local"),
    getSeedVessel("MV Pelagia Star"),
    getSeedAccount("700201"),
  ]);
  submitterId = user.id;
  vesselId = vessel.id;
  accountId = account.id;
});

afterEach(async () => {
  await deletePosByTitle(PREFIX);
  vi.clearAllMocks();
});

async function makePo(title: string): Promise<string> {
  vi.mocked(auth as unknown as () => Promise<unknown>).mockResolvedValue(makeSession(submitterId, "MANAGER"));
  const result = await createPo(makePoForm({ title, vesselId, accountId, intent: "draft" }));
  expect(result).not.toHaveProperty("error");
  return (result as { id: string }).id;
}

function pdf(name: string, contents = "%PDF-1.4 hello"): File {
  return new File([contents], name, { type: "application/pdf" });
}

describe("uploadPoDocuments", () => {
  it("creates a PODocument row and stores the file, so it is visible on the PO", async () => {
    const poId = await makePo(`${PREFIX}Visible`);
    vi.mocked(auth as unknown as () => Promise<unknown>).mockResolvedValue(makeSession(submitterId, "MANAGER"));

    const file = pdf("invoice.pdf");
    const err = await uploadPoDocuments(poId, [file]);
    expect(err).toBeNull();

    // The file was actually handed to storage with its bytes + mime type.
    expect(uploadBuffer).toHaveBeenCalledTimes(1);
    const [key, buffer, mime] = vi.mocked(uploadBuffer).mock.calls[0];
    expect(key).toMatch(/^po-document\//);
    expect(mime).toBe("application/pdf");
    expect(Buffer.isBuffer(buffer)).toBe(true);

    // The row exists — this is what was missing in the broken flow.
    const docs = await db.pODocument.findMany({ where: { poId } });
    expect(docs).toHaveLength(1);
    expect(docs[0]).toMatchObject({
      fileName: "invoice.pdf",
      mimeType: "application/pdf",
      storageKey: key,
    });
    expect(docs[0].fileSize).toBeGreaterThan(0);

    // And it is surfaced by the exact include the PO detail page renders from.
    const po = await db.purchaseOrder.findUnique({
      where: { id: poId },
      include: { documents: { orderBy: { uploadedAt: "desc" } } },
    });
    expect(po?.documents.map((d) => d.fileName)).toEqual(["invoice.pdf"]);
  });

  it("tags receipt uploads with the receipt prefix (delivery group)", async () => {
    const poId = await makePo(`${PREFIX}Receipt`);
    vi.mocked(auth as unknown as () => Promise<unknown>).mockResolvedValue(makeSession(submitterId, "MANAGER"));

    const err = await uploadPoDocuments(poId, [pdf("delivery-note.pdf")], "receipt");
    expect(err).toBeNull();

    const doc = await db.pODocument.findFirstOrThrow({ where: { poId } });
    expect(doc.storageKey).toMatch(/^receipt\//);
  });

  it("stores every file when several are uploaded at once", async () => {
    const poId = await makePo(`${PREFIX}Multi`);
    vi.mocked(auth as unknown as () => Promise<unknown>).mockResolvedValue(makeSession(submitterId, "MANAGER"));

    const err = await uploadPoDocuments(poId, [pdf("a.pdf"), pdf("b.pdf"), pdf("c.pdf")]);
    expect(err).toBeNull();
    expect(await db.pODocument.count({ where: { poId } })).toBe(3);
  });

  it("skips empty files without creating rows", async () => {
    const poId = await makePo(`${PREFIX}Empty`);
    vi.mocked(auth as unknown as () => Promise<unknown>).mockResolvedValue(makeSession(submitterId, "MANAGER"));

    const err = await uploadPoDocuments(poId, [new File([], "blank.pdf", { type: "application/pdf" })]);
    expect(err).toBeNull();
    expect(uploadBuffer).not.toHaveBeenCalled();
    expect(await db.pODocument.count({ where: { poId } })).toBe(0);
  });

  it("rejects an unauthenticated caller and writes nothing", async () => {
    const poId = await makePo(`${PREFIX}NoAuth`);
    vi.mocked(auth as unknown as () => Promise<unknown>).mockResolvedValue(null);

    const err = await uploadPoDocuments(poId, [pdf("x.pdf")]);
    expect(err).toEqual({ error: "Unauthorized" });
    expect(await db.pODocument.count({ where: { poId } })).toBe(0);
  });

  it("errors when the PO does not exist", async () => {
    vi.mocked(auth as unknown as () => Promise<unknown>).mockResolvedValue(makeSession(submitterId, "MANAGER"));
    const err = await uploadPoDocuments("nonexistent-po-id", [pdf("x.pdf")]);
    expect(err).toEqual({ error: "PO not found" });
    expect(uploadBuffer).not.toHaveBeenCalled();
  });
});