// task-card-di.test.mjs — Unit tests for the createTaskCard DI doc param,
// log-tail placeholder (PENDING/QUEUED), and elapsed timer (RUNNING).
//
// Run with: node --test web/test/task-card-di.test.mjs

import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { createTaskCard } from '../app.js';

// ── Mock DOM ───────────────────────────────────────────────────────────────────

function makeEl(tag) {
  return {
    tag,
    className: '',
    textContent: '',
    title: '',
    hidden: false,
    dataset: {},
    children: [],
    classList: { add() {} },
    append(...nodes) {
      for (const n of nodes) {
        if (n != null && typeof n === 'object') this.children.push(n);
      }
    },
    appendChild(child) {
      if (child != null) this.children.push(child);
      return child;
    },
    addEventListener() {},
    setAttribute() {},
    getAttribute() { return null; },
  };
}

function makeDoc() {
  return {
    createElement(tag) { return makeEl(tag); },
  };
}

// Depth-first search for first element with the given class name.
function findByClass(el, cls) {
  for (const child of el.children || []) {
    if (typeof child.className === 'string' &&
        child.className.split(' ').includes(cls)) return child;
    const found = findByClass(child, cls);
    if (found) return found;
  }
  return null;
}

// ── Tests: DI doc param ────────────────────────────────────────────────────────

describe('createTaskCard doc DI param', () => {
  it('accepts a custom doc and uses it for createElement', () => {
    const created = [];
    const doc = {
      createElement(tag) {
        const el = makeEl(tag);
        created.push(tag);
        return el;
      },
    };
    createTaskCard({ id: 't1', state: 'QUEUED', name: 'Test Task' }, doc);
    assert.ok(created.length > 0, 'doc.createElement should have been called');
    assert.ok(created.includes('div'), 'should create at least one div');
    assert.ok(created.includes('span'), 'should create at least one span');
  });

  it('returns a card element whose tag is div', () => {
    const card = createTaskCard({ id: 't1', state: 'QUEUED', name: 'Test' }, makeDoc());
    assert.equal(card.tag, 'div');
    assert.equal(card.className, 'task-card');
    assert.equal(card.dataset.taskId, 't1');
  });
});

// ── Tests: log-tail placeholder (QUEUED) ──────────────────────────────────────

describe('log-tail placeholder for queue column', () => {
  it('QUEUED task has a task-log-placeholder element', () => {
    const card = createTaskCard({ id: 't1', state: 'QUEUED', name: 'Test' }, makeDoc());
    const placeholder = findByClass(card, 'task-log-placeholder');
    assert.ok(placeholder, 'QUEUED card should have a task-log-placeholder element');
  });

  it('QUEUED task log-tail placeholder text is "Waiting to start\u2026"', () => {
    const card = createTaskCard({ id: 't1', state: 'QUEUED', name: 'Test' }, makeDoc());
    const placeholder = findByClass(card, 'task-log-placeholder');
    assert.equal(placeholder.textContent, 'Waiting to start\u2026');
  });

  it('QUEUED task has a task-log-tail wrapper containing the placeholder', () => {
    const card = createTaskCard({ id: 't1', state: 'QUEUED', name: 'Test' }, makeDoc());
    const logTail = findByClass(card, 'task-log-tail');
    assert.ok(logTail, 'QUEUED card should have a task-log-tail wrapper');
    const placeholder = findByClass(logTail, 'task-log-placeholder');
    assert.ok(placeholder, 'task-log-tail should contain task-log-placeholder');
  });

  it('RUNNING task does not have a task-log-placeholder', () => {
    const card = createTaskCard({ id: 't1', state: 'RUNNING', name: 'Test' }, makeDoc());
    const placeholder = findByClass(card, 'task-log-placeholder');
    assert.equal(placeholder, null, 'RUNNING card should not have a task-log-placeholder');
  });

  it('COMPLETED task does not have a task-log-placeholder', () => {
    const card = createTaskCard({ id: 't1', state: 'COMPLETED', name: 'Test' }, makeDoc());
    const placeholder = findByClass(card, 'task-log-placeholder');
    assert.equal(placeholder, null, 'COMPLETED card should not have a task-log-placeholder');
  });
});

// ── Tests: elapsed timer (RUNNING) ────────────────────────────────────────────

describe('elapsed timer for RUNNING tasks', () => {
  it('RUNNING task has a running-elapsed span', () => {
    const card = createTaskCard(
      { id: 't1', state: 'RUNNING', name: 'Test', updated_at: '2024-01-01T00:00:00Z' },
      makeDoc(),
    );
    const elapsed = findByClass(card, 'running-elapsed');
    assert.ok(elapsed, 'RUNNING card should have a running-elapsed element');
  });

  it('RUNNING task running-elapsed has data-started-at from task.updated_at', () => {
    const card = createTaskCard(
      { id: 't1', state: 'RUNNING', name: 'Test', updated_at: '2024-06-15T12:00:00Z' },
      makeDoc(),
    );
    const elapsed = findByClass(card, 'running-elapsed');
    assert.equal(elapsed.dataset.startedAt, '2024-06-15T12:00:00Z');
  });

  it('RUNNING task running-elapsed data-started-at is empty string when updated_at is absent', () => {
    const card = createTaskCard(
      { id: 't1', state: 'RUNNING', name: 'Test' },
      makeDoc(),
    );
    const elapsed = findByClass(card, 'running-elapsed');
    assert.equal(elapsed.dataset.startedAt, '');
  });

  it('running-elapsed is inside the card header', () => {
    const card = createTaskCard(
      { id: 't1', state: 'RUNNING', name: 'Test', updated_at: '2024-01-01T00:00:00Z' },
      makeDoc(),
    );
    // The header is the first child of the card (a div.task-card-header).
    const header = findByClass(card, 'task-card-header');
    assert.ok(header, 'card should have a task-card-header');
    const elapsed = findByClass(header, 'running-elapsed');
    assert.ok(elapsed, 'running-elapsed should be inside the task-card-header');
  });

  it('QUEUED task does not have a running-elapsed span', () => {
    const card = createTaskCard({ id: 't1', state: 'QUEUED', name: 'Test' }, makeDoc());
    const elapsed = findByClass(card, 'running-elapsed');
    assert.equal(elapsed, null, 'QUEUED card should not have a running-elapsed element');
  });

  it('COMPLETED task does not have a running-elapsed span', () => {
    const card = createTaskCard({ id: 't1', state: 'COMPLETED', name: 'Test' }, makeDoc());
    const elapsed = findByClass(card, 'running-elapsed');
    assert.equal(elapsed, null, 'COMPLETED card should not have a running-elapsed element');
  });
});