const Fastify = require("fastify");
const todosRoutes = require("../../../src/routes/todos");
const { AppError } = require("../../../src/utils/AppError");

async function buildApp({ featureEnabled = true } = {}) {
  const app = Fastify();
  const prisma = {
    featureFlag: {
      findUnique: vi.fn(async () => ({
        flag_key: "todo_board_v1",
        override_mode: featureEnabled ? "force_on" : "force_off",
        rollout_type: "global",
        department_ids: [],
      })),
    },
    todoItem: {
      findMany: vi.fn(async () => []),
      create: vi.fn(),
      findUnique: vi.fn(),
      update: vi.fn(),
    },
  };
  app.decorate("prisma", prisma);
  app.decorate("config", { todoBoardEnabled: true });
  app.decorate("authenticate", async (request) => {
    request.employee = { id: "employee-1", department_id: "department-1", permissionCodes: [] };
  });
  app.decorate("hasPermission", () => false);
  app.setErrorHandler((error, request, reply) => {
    if (error instanceof AppError) {
      return reply.code(error.statusCode).send({ error: { code: error.code, details: error.details ?? {} } });
    }
    return reply.code(500).send({ error: { code: "SYS_001" } });
  });
  await app.register(todosRoutes, { prefix: "/api" });
  return { app, prisma };
}

describe("todos feature gate", () => {
  it("returns a precise reasonCode and skips todo reads when the board is disabled", async () => {
    const { app, prisma } = await buildApp({ featureEnabled: false });
    try {
      const getResponse = await app.inject({ method: "GET", url: "/api/todos" });
      expect(getResponse.statusCode).toBe(409);
      expect(getResponse.json()).toEqual({
        error: {
          code: "VALID_001",
          details: { featureFlag: "todo_board_v1_disabled", reason: "flag_force_off", reasonCode: "todo.feature_disabled" },
        },
      });
      expect(prisma.todoItem.findMany).not.toHaveBeenCalled();

      const postResponse = await app.inject({
        method: "POST",
        url: "/api/todos",
        payload: { title: "合成待办" },
      });
      expect(postResponse.statusCode).toBe(409);
      expect(postResponse.json().error.details.reasonCode).toBe("todo.feature_disabled");
      expect(prisma.todoItem.create).not.toHaveBeenCalled();
    } finally {
      await app.close();
    }
  });

  it("lists todos normally without leaking a reasonCode when the board is enabled", async () => {
    const { app, prisma } = await buildApp({ featureEnabled: true });
    try {
      const response = await app.inject({ method: "GET", url: "/api/todos" });
      expect(response.statusCode).toBe(200);
      expect(response.json().data).toEqual({ items: [] });
      expect(prisma.todoItem.findMany).toHaveBeenCalledTimes(1);
    } finally {
      await app.close();
    }
  });
});