import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { mkdtempSync } from "node:fs";
import { rm } from "node:fs/promises";
import { join } from "node:path";
import { tmpdir } from "node:os";
import { TaskStore } from "@fusion/core";
import { GitHubTrackingCommentService } from "../github-tracking-comments.js";
import { GitHubTrackingStateService } from "../github-tracking-state.js";

const { mockCommentOnIssue, mockSetIssueState, mockResolveGithubTrackingAuth } = vi.hoisted(() => ({
  mockCommentOnIssue: vi.fn(),
  mockSetIssueState: vi.fn(),
  mockResolveGithubTrackingAuth: vi.fn(),
}));

vi.mock("../github.js", () => ({
  GitHubClient: vi.fn().mockImplementation(() => ({
    commentOnIssue: (...args: unknown[]) => mockCommentOnIssue(...args),
    setIssueState: (...args: unknown[]) => mockSetIssueState(...args),
  })),
}));

vi.mock("../github-auth.js", () => ({
  resolveGithubTrackingAuth: (...args: unknown[]) => mockResolveGithubTrackingAuth(...args),
}));

function makeTmpDir(): string {
  return mkdtempSync(join(tmpdir(), "kb-dashboard-github-tracking-unlink-test-"));
}

async function flushAsync(): Promise<void> {
  await new Promise((resolve) => setTimeout(resolve, 0));
}

describe("github tracking unlink flow", () => {
  let rootDir: string;
  let globalDir: string;
  let store: TaskStore;
  let commentService: GitHubTrackingCommentService;
  let stateService: GitHubTrackingStateService;

  beforeEach(async () => {
    vi.clearAllMocks();
    mockResolveGithubTrackingAuth.mockReturnValue({ ok: true, auth: { mode: "token", token: "token" } });
    rootDir = makeTmpDir();
    globalDir = makeTmpDir();
    store = new TaskStore(rootDir, globalDir, { inMemoryDb: true });
    await store.init();
    commentService = new GitHubTrackingCommentService(store);
    stateService = new GitHubTrackingStateService(store);
    commentService.start();
    stateService.start();
  });

  afterEach(async () => {
    commentService.stop();
    stateService.stop();
    await flushAsync();
    store.close();
    await rm(rootDir, { recursive: true, force: true });
    await rm(globalDir, { recursive: true, force: true });
  });

  it("clears linked issue metadata on unlink while preserving toggle semantics", async () => {
    const task = await store.createTask({
      description: "unlink",
      githubTracking: {
        enabled: true,
        repoOverride: "octocat/hello-world",
      },
    });

    await store.linkGithubIssue(task.id, {
      owner: "octocat",
      repo: "hello-world",
      number: 7,
      url: "https://github.com/octocat/hello-world/issues/7",
      createdAt: new Date().toISOString(),
    });

    const unlinked = await store.unlinkGithubIssue(task.id);
    expect(unlinked.githubTracking?.issue).toBeUndefined();
    expect(unlinked.githubTracking?.unlinkedAt).toBeTruthy();
    expect(unlinked.githubTracking?.enabled).toBe(true);
  });

  it("stops all status-sync calls after unlink and does not mutate remote issue during unlink", async () => {
    const task = await store.createTask({
      description: "unlink sync",
      githubTracking: { enabled: true },
    });

    await store.linkGithubIssue(task.id, {
      owner: "octocat",
      repo: "hello-world",
      number: 9,
      url: "https://github.com/octocat/hello-world/issues/9",
      createdAt: new Date().toISOString(),
    });

    await store.moveTask(task.id, "todo");
    await store.moveTask(task.id, "in-progress");
    await store.moveTask(task.id, "done");
    await flushAsync();

    expect(mockCommentOnIssue).toHaveBeenCalled();
    expect(mockSetIssueState).toHaveBeenCalled();

    mockCommentOnIssue.mockClear();
    mockSetIssueState.mockClear();

    await store.unlinkGithubIssue(task.id);
    await flushAsync();

    // unlink is local-only: should not close/reopen/comment as a side-effect
    expect(mockCommentOnIssue).not.toHaveBeenCalled();
    expect(mockSetIssueState).not.toHaveBeenCalled();

    await store.moveTask(task.id, "todo");
    await store.moveTask(task.id, "in-progress");
    await store.moveTask(task.id, "done");
    await flushAsync();

    expect(mockCommentOnIssue).not.toHaveBeenCalled();
    expect(mockSetIssueState).not.toHaveBeenCalled();
  });
});