import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { mkdtempSync, rmSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';
import {
  createTask, listTasks, getTask,
  claimTask, doneTask, reviewTask, cancelTask, reopenTask, deleteTask,
} from '../src/core/services/taskService.js';
import { init } from '../src/cli/commands/init.js';
import { Index } from '../src/core/index.js';

describe('taskService', () => {
  let cwd: string;

  beforeEach(() => {
    cwd = mkdtempSync(join(tmpdir(), 'ah-task-'));
  });

  afterEach(() => {
    rmSync(cwd, { recursive: true, force: true });
  });

  it('creates a task', () => {
    const task = createTask(cwd, { title: 'Test', role: 'implementer' });
    expect(task.id).toBe('TSK-0001');
    expect(task.title).toBe('Test');
    expect(task.status).toBe('open');
  });

  it('lists tasks', () => {
    createTask(cwd, { title: 'A', role: 'implementer' });
    expect(listTasks(cwd)).toHaveLength(1);
  });

  it('claims and completes a task', () => {
    const task = createTask(cwd, { title: 'B', role: 'implementer' });
    const claimed = claimTask(cwd, task.id, 'codex');
    expect(claimed.status).toBe('in_progress');
    expect(claimed.assignedTo).toBe('codex');
    const done = doneTask(cwd, task.id);
    expect(done.status).toBe('done');
  });

  it('transitions a task to review', () => {
    const task = createTask(cwd, { title: 'C', role: 'implementer' });
    const inReview = reviewTask(cwd, task.id);
    expect(inReview.status).toBe('review');
    // Verify index is updated
    const listed = listTasks(cwd, { status: 'review' });
    expect(listed).toHaveLength(1);
    expect(listed[0].id).toBe(task.id);
  });

  it('records an explicit reviewer separately from the assignee', () => {
    const task = createTask(cwd, { title: 'Review me', role: 'implementer', assignedTo: 'codex' });
    const inReview = reviewTask(cwd, task.id, 'claude');
    expect(inReview.status).toBe('review');
    expect(inReview.assignedTo).toBe('codex');
    expect(inReview.reviewer).toBe('claude');

    const listed = listTasks(cwd, { status: 'review' });
    expect(listed[0].assignedTo).toBe('codex');
    expect(listed[0].reviewer).toBe('claude');
  });

  it('uses the preferred reviewer when reviewTask is called without one', () => {
    init(cwd, { projectName: 'reviewer-test', yes: true });
    const task = createTask(cwd, { title: 'Review default', role: 'implementer', assignedTo: 'codex' });
    const inReview = reviewTask(cwd, task.id);
    expect(inReview.reviewer).toBe('claude');
  });

  it('cancels a task', () => {
    const task = createTask(cwd, { title: 'D', role: 'implementer' });
    const cancelled = cancelTask(cwd, task.id);
    expect(cancelled.status).toBe('cancelled');
    const listed = listTasks(cwd, { status: 'cancelled' });
    expect(listed).toHaveLength(1);
  });

  it('reopens a task (any status → open)', () => {
    const task = createTask(cwd, { title: 'E', role: 'implementer' });
    cancelTask(cwd, task.id);
    const reopened = reopenTask(cwd, task.id);
    expect(reopened.status).toBe('open');
    const listed = listTasks(cwd, { status: 'open' });
    expect(listed).toHaveLength(1);
  });

  it('getTask reads back the correct task', () => {
    const task = createTask(cwd, { title: 'F', role: 'architect' });
    const { task: read } = getTask(cwd, task.id);
    expect(read.title).toBe('F');
    expect(read.role).toBe('architect');
  });

  it('deletes a task: gone from the list, file, and search index', () => {
    const keep = createTask(cwd, { title: 'keep me', role: 'implementer' });
    const ghost = createTask(cwd, { title: 'ghost purge me', role: 'implementer' });
    expect(listTasks(cwd)).toHaveLength(2);

    const res = deleteTask(cwd, ghost.id);
    expect(res.id).toBe(ghost.id);

    // Removed from the index list…
    const remaining = listTasks(cwd);
    expect(remaining).toHaveLength(1);
    expect(remaining[0].id).toBe(keep.id);

    // …its markdown file is gone (getTask throws)…
    expect(() => getTask(cwd, ghost.id)).toThrow();

    // …and it no longer surfaces in the FTS search index.
    const index = new Index(cwd);
    const hits = index.search('purge').map((h) => h.id);
    index.close();
    expect(hits).not.toContain(ghost.id);
  });

  it('deleteTask is idempotent (deleting a missing task does not throw)', () => {
    expect(() => deleteTask(cwd, 'TSK-9999')).not.toThrow();
  });
});