import { HooksClient } from "@openhands/typescript-client/clients";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import {
  __resetActiveStoreForTests,
  setActiveSelection,
  setRegisteredBackends,
} from "#/api/backend-registry/active-store";
import { DEFAULT_WORKING_DIR } from "#/api/agent-server-config";
import type { Backend } from "#/api/backend-registry/types";

const { mockLoadHooks } = vi.hoisted(() => ({
  mockLoadHooks: vi.fn(),
}));

vi.mock("@openhands/typescript-client/clients", () => ({
  HooksClient: vi.fn(function HooksClientMock() {
    return { loadHooks: mockLoadHooks };
  }),
}));

import HooksService from "#/api/hooks-service";

const localBackend: Backend = {
  id: "local",
  name: "Local",
  host: "http://127.0.0.1:8000",
  apiKey: "",
  kind: "local",
};

const cloudBackend: Backend = {
  id: "cloud",
  name: "Cloud",
  host: "https://openhands.dev",
  apiKey: "cloud-key",
  kind: "cloud",
};

beforeEach(() => {
  window.localStorage.clear();
  __resetActiveStoreForTests();
  setRegisteredBackends([localBackend]);
  setActiveSelection({ backendId: localBackend.id });
  mockLoadHooks.mockReset();
  vi.mocked(HooksClient).mockClear();
});

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

describe("HooksService.loadWorkspaceHooks", () => {
  it("loads workspace hooks from the agent-server when present", async () => {
    const mockHookConfig = {
      session_start: [
        {
          matcher: "*",
          hooks: [{ command: "cat AGENTS.md", type: "command" }],
        },
      ],
      pre_tool_use: [],
      post_tool_use: [],
      user_prompt_submit: [],
      session_end: [],
      stop: [],
    };

    mockLoadHooks.mockResolvedValue({ hook_config: mockHookConfig });

    const result = await HooksService.loadWorkspaceHooks(
      "/workspace/test-project",
    );

    expect(mockLoadHooks).toHaveBeenCalledTimes(1);
    expect(mockLoadHooks).toHaveBeenCalledWith({
      project_dir: "/workspace/test-project",
    });
    expect(result).toEqual(mockHookConfig);
  });

  it("defaults project_dir to getAgentServerWorkingDir() when omitted", async () => {
    mockLoadHooks.mockResolvedValue({ hook_config: null });

    const result = await HooksService.loadWorkspaceHooks();

    expect(mockLoadHooks).toHaveBeenCalledTimes(1);
    expect(mockLoadHooks).toHaveBeenCalledWith({
      project_dir: DEFAULT_WORKING_DIR,
    });
    expect(result).toBeNull();
  });

  it("gracefully returns null and warns when the agent-server throws an error", async () => {
    const warn = vi.spyOn(console, "warn").mockImplementation(() => {});
    mockLoadHooks.mockRejectedValue(new Error("500 Internal Server Error"));

    const result = await HooksService.loadWorkspaceHooks("/workspace/broken");

    expect(result).toBeNull();
    expect(warn).toHaveBeenCalled();
    warn.mockRestore();
  });

  // The lookup is on the launch critical path; the SDK's 60s default would
  // stall a launch against a wedged agent-server.
  it("bounds the request so a wedged agent-server cannot stall a launch", async () => {
    mockLoadHooks.mockResolvedValue({ hook_config: null });

    await HooksService.loadWorkspaceHooks("/workspace/test-project");

    const [clientOptions] = vi.mocked(HooksClient).mock.calls[0];
    expect(clientOptions.timeout).toBeLessThanOrEqual(10_000);
  });

  it("returns null immediately for cloud backend without calling HooksClient", async () => {
    setRegisteredBackends([cloudBackend]);
    setActiveSelection({ backendId: cloudBackend.id });

    const result = await HooksService.loadWorkspaceHooks("/workspace/cloud");

    expect(mockLoadHooks).not.toHaveBeenCalled();
    expect(result).toBeNull();
  });

  it("returns null for unseeded/empty registry (NO_BACKEND sentinel) without calling HooksClient", async () => {
    // Simulate a fresh install with no backends registered.
    // setRegisteredBackends([]) computes the snapshot with NO_BACKEND,
    // so getEffectiveLocalBackend() returns null.
    setRegisteredBackends([]);

    const result = await HooksService.loadWorkspaceHooks("/workspace/test");

    expect(mockLoadHooks).not.toHaveBeenCalled();
    expect(result).toBeNull();
  });
});