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, setTaskCreatedHook } from "@fusion/core";

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

vi.mock("../github.js", () => ({
  GitHubClient: vi.fn().mockImplementation(() => ({
    createIssue: (...args: unknown[]) => mockCreateIssue(...args),
  })),
}));

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

import { createTrackingIssueForTask, registerGithubTrackingHook } from "../github-tracking-hook.js";
import * as githubTracking from "../github-tracking.js";

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

describe("registerGithubTrackingHook", () => {
  let rootDir: string;
  let globalDir: string;
  let store: TaskStore;

  beforeEach(async () => {
    setTaskCreatedHook(undefined);
    vi.clearAllMocks();
    mockResolveGithubTrackingAuth.mockReturnValue({ ok: true, auth: { mode: "token", token: "tok" } });
    mockCreateIssue.mockResolvedValue({
      owner: "o",
      repo: "r",
      number: 42,
      htmlUrl: "https://github.com/o/r/issues/42",
      createdAt: "2026-01-01T00:00:00.000Z",
    });
    rootDir = makeTmpDir();
    globalDir = makeTmpDir();
    store = new TaskStore(rootDir, globalDir, { inMemoryDb: true });
    await store.init();
  });

  afterEach(async () => {
    setTaskCreatedHook(undefined);
    store.close();
    await rm(rootDir, { recursive: true, force: true });
    await rm(globalDir, { recursive: true, force: true });
  });

  it("creates a tracking issue when githubTracking.enabled is true and repo is configured", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingDefaultRepo: "o/r",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const task = await store.createTask({
      description: "test task",
      title: "Test task",
      githubTracking: { enabled: true },
    });

    expect(mockCreateIssue).toHaveBeenCalledTimes(1);
    expect(mockCreateIssue).toHaveBeenCalledWith(
      expect.objectContaining({ owner: "o", repo: "r", title: expect.stringContaining(task.id) }),
    );
  });

  it("is a no-op when githubTracking is not enabled", async () => {
    registerGithubTrackingHook();

    await store.createTask({
      description: "no tracking",
      title: "No tracking",
    });

    expect(mockCreateIssue).not.toHaveBeenCalled();
  });

  it("is a no-op when task already has a linked issue", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingDefaultRepo: "o/r",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const task = await store.createTask({
      description: "already linked",
      title: "Already linked",
      githubTracking: {
        enabled: true,
        issue: { owner: "o", repo: "r", number: 1, url: "https://github.com/o/r/issues/1" },
      },
    });

    expect(mockCreateIssue).not.toHaveBeenCalled();
  });

  it("does not propagate hook errors out of createTask", async () => {
    mockCreateIssue.mockRejectedValue(new Error("Octokit failure"));
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingDefaultRepo: "o/r",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    // Should NOT throw — best-effort contract
    const task = await store.createTask({
      description: "will fail gracefully",
      title: "Graceful failure",
      githubTracking: { enabled: true },
    });

    expect(task.id).toMatch(/^FN-/);
    expect(mockCreateIssue).toHaveBeenCalledTimes(1);
  });

  it("creates one issue total across hook execution and follow-up stale reference call", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingDefaultRepo: "o/r",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const createdTask = await store.createTask({
      description: "stale follow up",
      title: "Stale follow up",
      githubTracking: { enabled: true },
    });

    const staleTaskRef = { ...createdTask, githubTracking: { enabled: true } };
    const projectSettings = await store.getSettings();

    const result = await githubTracking.maybeCreateTrackingIssue(staleTaskRef, {
      taskStore: store,
      projectSettings,
      globalSettings: {},
      rootDir,
      logger: { warn: vi.fn(), info: vi.fn() },
    });

    expect(result).toEqual({ created: false, reason: "issue_already_linked" });
    expect(mockCreateIssue).toHaveBeenCalledTimes(1);
  });

  it("passes request token when settings token is missing", async () => {
    const task = await store.createTask({
      description: "token override",
      githubTracking: { enabled: true },
    });

    const spy = vi.spyOn(githubTracking, "maybeCreateTrackingIssue").mockResolvedValue({
      created: false,
      reason: "tracking_disabled",
    });

    await createTrackingIssueForTask(store, task, { githubToken: "request-token" });

    expect(spy).toHaveBeenCalledWith(
      task,
      expect.objectContaining({
        projectSettings: expect.objectContaining({ githubAuthToken: "request-token" }),
      }),
    );
    spy.mockRestore();
  });

  it("passes registered hook githubToken fallback when settings token is missing", async () => {
    registerGithubTrackingHook({ githubToken: "hook-token" });

    await store.updateSettings({
      githubTrackingDefaultRepo: "o/r",
      githubAuthMode: "token",
    });

    await store.createTask({
      description: "hook token fallback",
      title: "Hook token fallback",
      githubTracking: { enabled: true },
    });

    await vi.waitFor(() => {
      expect(mockCreateIssue).toHaveBeenCalledTimes(1);
    });
  });

  it("prefers settings token over request token", async () => {
    await store.updateSettings({ githubAuthToken: "settings-token" });
    const task = await store.createTask({
      description: "token precedence",
      githubTracking: { enabled: true },
    });

    const spy = vi.spyOn(githubTracking, "maybeCreateTrackingIssue").mockResolvedValue({
      created: false,
      reason: "tracking_disabled",
    });

    await createTrackingIssueForTask(store, task, { githubToken: "request-token" });

    expect(spy).toHaveBeenCalledWith(
      task,
      expect.objectContaining({
        projectSettings: expect.objectContaining({ githubAuthToken: "settings-token" }),
      }),
    );
    spy.mockRestore();
  });

  it("swallows maybeCreateTrackingIssue errors", async () => {
    const task = await store.createTask({
      description: "best effort",
      githubTracking: { enabled: true },
    });

    const spy = vi.spyOn(githubTracking, "maybeCreateTrackingIssue").mockRejectedValue(new Error("boom"));

    await expect(createTrackingIssueForTask(store, task)).resolves.toBeUndefined();
    spy.mockRestore();
  });

  it("creates tracking issue with summarized title when createTask summarization is pending", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    await store.createTask(
      {
        description: "Long task description ".repeat(20),
      },
      {
        onSummarize: async () => "Summarized Issue Title",
        settings: { autoSummarizeTitles: true },
      },
    );

    await vi.waitFor(() => {
      expect(mockCreateIssue).toHaveBeenCalledTimes(1);
    });

    expect(mockCreateIssue).toHaveBeenCalledWith(
      expect.objectContaining({
        owner: "owner",
        repo: "repo",
        title: expect.stringContaining("Summarized Issue Title"),
      }),
    );
  });

  it("creates one fallback issue title when summarizer rejects", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const description = "Fallback issue title words should appear in GitHub issue title. ".repeat(10);

    await store.createTask(
      { description },
      {
        onSummarize: async () => {
          throw new Error("summarizer failed");
        },
        settings: { autoSummarizeTitles: true },
      },
    );

    await vi.waitFor(() => {
      expect(mockCreateIssue).toHaveBeenCalledTimes(1);
    });

    expect(mockCreateIssue).toHaveBeenCalledWith(
      expect.objectContaining({
        title: expect.stringContaining("Fallback issue title words should appear"),
      }),
    );
  });

  it("persists enabled=true from project default when repo is missing", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const created = await store.createTask({
      description: "default tracking without repo",
      title: "Default tracking without repo",
    });

    const persisted = await store.getTask(created.id);
    expect(persisted?.githubTracking?.enabled).toBe(true);
    expect(mockCreateIssue).not.toHaveBeenCalled();
  });

  it("persists enabled=true from project default when no title is available", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
      titleSummarizerProvider: undefined,
      titleSummarizerModelId: undefined,
      titleSummarizerFallbackProvider: undefined,
      titleSummarizerFallbackModelId: undefined,
    });

    const created = await store.createTask({
      description: "```ts\nconst value = 1;\n```",
    });

    const persisted = await store.getTask(created.id);
    expect(persisted?.githubTracking?.enabled).toBe(true);
    expect(persisted?.githubTracking?.issue).toBeUndefined();
    expect(mockCreateIssue).not.toHaveBeenCalled();
  });

  it("creates issue and keeps enabled=true when project default tracking is on", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const created = await store.createTask({
      description: "default tracking with repo",
      title: "Default tracking with repo",
    });

    const persisted = await store.getTask(created.id);
    expect(mockCreateIssue).toHaveBeenCalledTimes(1);
    expect(persisted?.githubTracking?.enabled).toBe(true);
    expect(persisted?.githubTracking?.issue).toEqual(
      expect.objectContaining({ owner: "owner", repo: "repo", number: 42 }),
    );
  });

  it("invokes maybeCreateTrackingIssue for api-source tasks when default tracking is enabled", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const spy = vi.spyOn(githubTracking, "maybeCreateTrackingIssue");
    const created = await store.createTask({
      description: "api sourced task",
      source: { sourceType: "api" },
    });

    expect(spy).toHaveBeenCalledTimes(1);
    expect(spy).toHaveBeenCalledWith(
      expect.objectContaining({ id: created.id, sourceType: "api" }),
      expect.objectContaining({
        projectSettings: expect.objectContaining({ githubTrackingDefaultRepo: "owner/repo" }),
      }),
    );
  });

  it("keeps inline enabled=false without flipping back on", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const created = await store.createTask({
      description: "tracking explicitly disabled",
      title: "Tracking explicitly disabled",
      githubTracking: { enabled: false },
    });

    const persisted = await store.getTask(created.id);
    const enabledLogs = persisted?.log.filter((entry) => entry.action === "GitHub tracking enabled") ?? [];

    expect(persisted?.githubTracking?.enabled).toBe(false);
    expect(enabledLogs).toHaveLength(0);
    expect(mockCreateIssue).not.toHaveBeenCalled();
  });

  it("avoids redundant enabled writes when inline enabled=true already set", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const created = await store.createTask({
      description: "tracking already enabled",
      title: "Tracking already enabled",
      githubTracking: { enabled: true },
    });

    const afterHook = await store.getTask(created.id);
    const enabledLogsBefore = afterHook?.log.filter((entry) => entry.action === "GitHub tracking enabled").length ?? 0;

    await createTrackingIssueForTask(store, created);

    const afterSecondPass = await store.getTask(created.id);
    const enabledLogsAfter = afterSecondPass?.log.filter((entry) => entry.action === "GitHub tracking enabled").length ?? 0;

    expect(enabledLogsBefore).toBe(0);
    expect(enabledLogsAfter).toBe(0);
    expect(mockCreateIssue).not.toHaveBeenCalled();
  });

  it("creates exactly one issue per planning-style createTask invocation", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    await store.createTask({
      title: "Planning single task",
      description: "planning summary output",
      source: { sourceType: "api" },
    });

    await store.createTask({
      title: "Planning subtask A",
      description: "planning subtask output",
      source: { sourceType: "api", sourceMetadata: { planningSessionId: "sess-1" } },
    });

    expect(mockCreateIssue).toHaveBeenCalledTimes(2);
  });

  it("creates issue during createTask await when summarization is disabled", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubTrackingDefaultRepo: "owner/repo",
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const beforeAwaitCalls = mockCreateIssue.mock.calls.length;
    await store.createTask(
      {
        description: "No summarization configured but tracking issue should still be created",
      },
      {
        settings: { autoSummarizeTitles: false },
      },
    );
    const afterAwaitCalls = mockCreateIssue.mock.calls.length;

    expect(afterAwaitCalls - beforeAwaitCalls).toBe(1);
    expect(mockCreateIssue).toHaveBeenLastCalledWith(
      expect.objectContaining({
        title: expect.stringContaining("No summarization configured"),
      }),
    );
  });

  it("records a github-tracking-no-repo activity for agent-created tasks when defaults enable tracking", async () => {
    registerGithubTrackingHook();

    await store.updateSettings({
      githubTrackingEnabledByDefault: true,
      githubAuthMode: "token",
      githubAuthToken: "tok",
    });

    const task = await store.createTask({
      description: "agent-created task with missing repo",
      source: { sourceType: "api" },
    });

    const activity = await store.getActivityLog({ type: "task:updated" });
    const trackingNoRepoEntries = activity.filter((entry) =>
      entry.taskId === task.id && (entry.metadata as { type?: string } | undefined)?.type === "github-tracking-no-repo",
    );

    expect(mockCreateIssue).not.toHaveBeenCalled();
    expect(trackingNoRepoEntries).toHaveLength(1);
  });
});