const Fastify = require("fastify");
const reimbursementRoutes = require("../../../src/routes/reimbursements");

const FORM_ID = "11111111-1111-4111-8111-111111111111";
const ACTOR_ID = "22222222-2222-4222-8222-222222222222";
const ITEM_ID = "33333333-3333-4333-8333-333333333333";
const TYPE_ID = "44444444-4444-4444-8444-444444444444";

async function buildApp({ status = "draft", participant = true, expenseTypeId = null, missingItem = false, typeEnabled = true } = {}) {
  const item = {
    id: ITEM_ID,
    reimbursement_id: FORM_ID,
    expense_type_id: expenseTypeId,
    expense_date: new Date("2026-09-09T00:00:00Z"),
    amount: "100.00",
    description: "合成测试支出",
  };
  const tx = {
    $queryRaw: vi.fn(async () => [{
      id: FORM_ID, owner_id: participant ? ACTOR_ID : TYPE_ID, submitter_id: TYPE_ID, status,
    }]),
    expenseType: { findUnique: vi.fn(async () => ({ id: TYPE_ID, enabled: typeEnabled, category: "office" })) },
    reimbursementItem: {
      findFirst: vi.fn(async () => item),
      findMany: vi.fn(async () => missingItem ? [] : [item]),
      updateMany: vi.fn(async () => ({ count: 1 })),
      create: vi.fn(async ({ data }) => ({ id: ITEM_ID, ...data })),
      update: vi.fn(async ({ data }) => Object.assign(item, data)),
      aggregate: vi.fn(async () => ({ _sum: { amount: "100.00" } })),
    },
    reimbursementForm: { update: vi.fn(async () => ({})) },
  };
  const app = Fastify();
  app.decorate("config", {});
  app.decorate("prisma", { $transaction: async (callback) => callback(tx) });
  app.decorate("requirePermission", () => async (request) => { request.employee = { id: ACTOR_ID }; });
  app.decorate("authenticate", async (request) => { request.employee = { id: ACTOR_ID }; });
  app.setErrorHandler((error, request, reply) => reply.status(error.statusCode ?? 500).send({
    error: { code: error.code, details: error.details },
  }));
  await app.register(reimbursementRoutes, { prefix: "/api" });
  return { app, tx };
}

describe("draft reimbursement classification", () => {
  it("classifies only explicitly selected items without changing amount, date, description or approval basis", async () => {
    const { app, tx } = await buildApp();
    try {
      const response = await app.inject({ method: "POST", url: `/api/reimbursements/${FORM_ID}/items/classify`,
        payload: { itemIds: [ITEM_ID, ITEM_ID], expenseTypeId: TYPE_ID } });
      expect(response.statusCode, response.body).toBe(200);
      expect(tx.reimbursementItem.updateMany).toHaveBeenCalledWith({
        where: { reimbursement_id: FORM_ID, id: { in: [ITEM_ID] } },
        data: { expense_type_id: TYPE_ID, updated_by: ACTOR_ID },
      });
      expect(tx.reimbursementForm.update).not.toHaveBeenCalled();
    } finally { await app.close(); }
  });

  it.each([
    [{ missingItem: true }, 409], [{ typeEnabled: false }, 409],
    [{ participant: false }, 403], [{ status: "reviewing" }, 409],
  ])("rejects a whole classification batch without partial writes: %j", async (options, expectedStatus) => {
    const { app, tx } = await buildApp(options);
    try {
      const response = await app.inject({ method: "POST", url: `/api/reimbursements/${FORM_ID}/items/classify`,
        payload: { itemIds: [ITEM_ID], expenseTypeId: TYPE_ID } });
      expect(response.statusCode, response.body).toBe(expectedStatus);
      expect(tx.reimbursementItem.updateMany).not.toHaveBeenCalled();
    } finally { await app.close(); }
  });

  it.each(["draft", "rejected"])("saves an explicitly unclassified item in %s without guessing a type", async (status) => {
    const { app, tx } = await buildApp({ status });
    try {
      const response = await app.inject({ method: "POST", url: `/api/reimbursements/${FORM_ID}/items`, payload: {
        expenseTypeId: null, expenseDate: "2026-09-09", amount: "100.00", description: "",
      } });
      expect(response.statusCode, response.body).toBe(200);
      expect(response.json().data.item.expenseTypeId).toBeNull();
      expect(tx.expenseType.findUnique).not.toHaveBeenCalled();
      expect(tx.reimbursementItem.create.mock.calls[0][0].data.expense_type_id).toBeNull();
    } finally { await app.close(); }
  });

  it.each([
    [null, { description: "修正合成说明" }, null],
    [TYPE_ID, { expenseTypeId: null }, null],
    [null, { expenseTypeId: TYPE_ID }, TYPE_ID],
  ])("edits classification without nullish fallback or fabricated defaults", async (expenseTypeId, payload, expected) => {
    const { app, tx } = await buildApp({ expenseTypeId });
    try {
      const response = await app.inject({ method: "PATCH", url: `/api/reimbursements/${FORM_ID}/items/${ITEM_ID}`, payload });
      expect(response.statusCode, response.body).toBe(200);
      expect(response.json().data.item.expenseTypeId).toBe(expected);
      if (expected === null) expect(tx.expenseType.findUnique).not.toHaveBeenCalled();
    } finally { await app.close(); }
  });

  it.each([
    [{ participant: false }, 403],
    [{ status: "reviewing" }, 409],
    [{ status: "approved" }, 409],
    [{ status: "paid" }, 409],
  ])("does not widen maintenance permissions or states: %j", async (options, statusCode) => {
    const { app, tx } = await buildApp(options);
    try {
      const response = await app.inject({ method: "PATCH", url: `/api/reimbursements/${FORM_ID}/items/${ITEM_ID}`, payload: { expenseTypeId: null } });
      expect(response.statusCode, response.body).toBe(statusCode);
      expect(tx.reimbursementItem.update).not.toHaveBeenCalled();
      expect(tx.reimbursementForm.update).not.toHaveBeenCalled();
    } finally { await app.close(); }
  });
});