import { describe, it, expect, beforeEach } from 'vitest';
import { mkdtemp } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { writeCache, type CacheFile } from '../../src/lib/cache.js';
import { makeTasksTools } from '../../src/tools/tasks.js';
import type { Backend, CommitFileArgs, CommitResult, FileWithSha } from '../../src/lib/backend.js';

function recordingBackend(initial: Record<string, FileWithSha> = {}) {
  const files = { ...initial };
  const commits: CommitFileArgs[] = [];
  const backend: Backend = {
    async listUserRepos() {
      return [];
    },
    async getRawFile(_u, repo, path) {
      return files[`${repo}:${path}`]?.content ?? null;
    },
    async getFileWithSha(_u, repo, path) {
      return files[`${repo}:${path}`] ?? null;
    },
    async commitFile(args: CommitFileArgs): Promise<CommitResult> {
      commits.push({ ...args });
      const fileSha = `sha-${commits.length}`;
      files[`${args.repo}:${args.path}`] = { content: args.content, sha: fileSha };
      return { fileSha, commitSha: `commit-${commits.length}` };
    },
  };
  return { backend, commits, files };
}

const fixture: CacheFile = {
  schemaVersion: 3,
  synced_at: '2026-06-08T12:00:00.000Z',
  synced_from: 'https://g',
  machine: 'm',
  projects: [
    {
      name: 'OpeItcLoc03/alpha',
      default_branch: 'main',
      fetched_at: '2026-06-08T12:00:01.000Z',
      active_tasks: [],
      all_tasks_count: 0,
      raw: '',
    },
  ],
  errors: [],
};

const ACTIVE_BOARD =
  '# Task Board\n_Updated: 2026-06-08_\n\n## 🔴 [my-task] — A thing\n\n' +
  '**Status:** active\n**Where I stopped:** mid-flight\n**Next action:** keep going\n' +
  '**Branch:** master\n**Owner:** host:claude-opus:1\n**Claim token:** tok-123\n\n---\n';

let cacheFile: string;
const fixedNow = () => new Date('2026-06-08T10:00:00.000Z');

beforeEach(async () => {
  const dir = await mkdtemp(join(tmpdir(), 'park-tool-'));
  cacheFile = join(dir, 'tasks.json');
  await writeCache(cacheFile, fixture);
});

function makeTools(backend: Backend) {
  return makeTasksTools({
    cacheFile,
    backend,
    giteaUser: 'u',
    agendaTasksRepo: 'projects-tasks',
    machine: 'host-x',
    now: fixedNow,
  });
}

function call(tools: ReturnType<typeof makeTasksTools>, name: string, args: Record<string, unknown>) {
  const t = tools.find((x) => x.name === name);
  if (!t) throw new Error(`tool ${name} not registered`);
  return t.handler(args);
}

const base = {
  target_project: 'OpeItcLoc03/alpha',
  slug: 'my-task',
  question: 'Should we drop the legacy column? (irreversible)',
};

describe('tasks.park_question', () => {
  it('is registered', () => {
    const { backend } = recordingBackend();
    expect(makeTools(backend).find((t) => t.name === 'tasks.park_question')).toBeTruthy();
  });

  it('flips status to blocked and writes the pending question (atomic, single commit)', async () => {
    const { backend, commits } = recordingBackend({
      'alpha:.tasks/STATUS.md': { content: ACTIVE_BOARD, sha: 'old' },
    });
    const tools = makeTools(backend);
    const r = await call(tools, 'tasks.park_question', base);
    const parsed = JSON.parse(r.content[0].text);

    expect(parsed.parked).toBe(true);
    expect(commits).toHaveLength(1);
    expect(commits[0].path).toBe('.tasks/STATUS.md');
    expect(commits[0].content).toContain('## 🔵 [my-task]');
    expect(commits[0].content).toContain('**Status:** blocked');
    expect(commits[0].content).toContain('Should we drop the legacy column?');
  });

  it('commits straight (no confirm gate — infra mutation)', async () => {
    const { backend, commits } = recordingBackend({
      'alpha:.tasks/STATUS.md': { content: ACTIVE_BOARD, sha: 'old' },
    });
    const tools = makeTools(backend);
    await call(tools, 'tasks.park_question', base); // no confirm flag
    expect(commits).toHaveLength(1);
  });

  it('with a matching claim_token, parks (token-gated like heartbeat)', async () => {
    const { backend, commits } = recordingBackend({
      'alpha:.tasks/STATUS.md': { content: ACTIVE_BOARD, sha: 'old' },
    });
    const tools = makeTools(backend);
    const r = await call(tools, 'tasks.park_question', { ...base, claim_token: 'tok-123' });
    expect(JSON.parse(r.content[0].text).parked).toBe(true);
    expect(commits).toHaveLength(1);
  });

  it('rejects a claim_token mismatch without committing (someone else holds the claim)', async () => {
    const { backend, commits } = recordingBackend({
      'alpha:.tasks/STATUS.md': { content: ACTIVE_BOARD, sha: 'old' },
    });
    const tools = makeTools(backend);
    const r = await call(tools, 'tasks.park_question', { ...base, claim_token: 'WRONG' });
    const parsed = JSON.parse(r.content[0].text);
    expect(parsed.ok).toBe(false);
    expect(parsed.reason).toBe('token-mismatch');
    expect(commits).toHaveLength(0);
  });

  it('errors when the task is not on the board', async () => {
    const { backend } = recordingBackend({
      'alpha:.tasks/STATUS.md': { content: ACTIVE_BOARD, sha: 'old' },
    });
    const tools = makeTools(backend);
    const r = await call(tools, 'tasks.park_question', { ...base, slug: 'ghost' });
    expect(r.isError).toBe(true);
  });

  it('is disabled without a backend', async () => {
    const tools = makeTasksTools({ cacheFile });
    const r = await call(tools, 'tasks.park_question', base);
    expect(r.isError).toBe(true);
  });

  it('calls inboxWriter with event:blocked when task has Notify field', async () => {
    const boardWithNotify =
      '# Task Board\n_Updated: 2026-06-08_\n\n## 🔴 [my-task] — A thing\n\n' +
      '**Status:** active\n**Where I stopped:** mid-flight\n**Next action:** keep going\n' +
      '**Branch:** master\n**Owner:** host:claude-opus:1\n**Claim token:** tok-123\n' +
      '**Notify:** OpeItcLoc03/workshop\n\n---\n';
    const { backend } = recordingBackend({
      'alpha:.tasks/STATUS.md': { content: boardWithNotify, sha: 'old' },
    });
    const inboxCalls: unknown[] = [];
    const inboxWriter = async (args: unknown) => { inboxCalls.push(args); };
    const tools = makeTasksTools({ cacheFile, backend, giteaUser: 'u', agendaTasksRepo: 'pt', now: fixedNow, inboxWriter });
    await call(tools, 'tasks.park_question', base);

    expect(inboxCalls).toHaveLength(1);
    expect((inboxCalls[0] as Record<string, string>).event).toBe('blocked');
    expect((inboxCalls[0] as Record<string, string>).notify).toBe('OpeItcLoc03/workshop');
    expect((inboxCalls[0] as Record<string, string>).slug).toBe('my-task');
  });
});