// active-tasks-tab.test.mjs — TDD contract tests for filterActiveTasks
//
// filterActiveTasks is imported from app.js. Tests are RED until the function
// is exported from app.js.
//
// Run with: node --test web/test/active-tasks-tab.test.mjs

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

// ── Helpers ────────────────────────────────────────────────────────────────────

function makeTask(state) {
  return { id: state, name: `task-${state}`, state };
}

// ── Tests ──────────────────────────────────────────────────────────────────────

describe('filterActiveTasks', () => {
  it('returns only RUNNING tasks when given mixed states', () => {
    const tasks = [makeTask('RUNNING'), makeTask('COMPLETED'), makeTask('PENDING')];
    const result = filterActiveTasks(tasks);
    assert.equal(result.length, 1);
    assert.equal(result[0].state, 'RUNNING');
  });

  it('returns only READY tasks', () => {
    const tasks = [makeTask('READY'), makeTask('FAILED'), makeTask('TIMED_OUT')];
    const result = filterActiveTasks(tasks);
    assert.equal(result.length, 1);
    assert.equal(result[0].state, 'READY');
  });

  it('returns only QUEUED tasks', () => {
    const tasks = [makeTask('QUEUED'), makeTask('CANCELLED'), makeTask('PENDING')];
    const result = filterActiveTasks(tasks);
    assert.equal(result.length, 1);
    assert.equal(result[0].state, 'QUEUED');
  });

  it('returns only BLOCKED tasks', () => {
    const tasks = [makeTask('BLOCKED'), makeTask('BUDGET_EXCEEDED'), makeTask('COMPLETED')];
    const result = filterActiveTasks(tasks);
    assert.equal(result.length, 1);
    assert.equal(result[0].state, 'BLOCKED');
  });

  it('returns all four active states together, excludes PENDING/COMPLETED/FAILED/TIMED_OUT/CANCELLED/BUDGET_EXCEEDED', () => {
    const allStates = [
      'RUNNING', 'READY', 'QUEUED', 'BLOCKED',
      'PENDING', 'COMPLETED', 'FAILED', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED',
    ];
    const tasks = allStates.map(makeTask);
    const result = filterActiveTasks(tasks);
    assert.equal(result.length, 4, 'exactly 4 active-state tasks should be returned');
    for (const state of ['RUNNING', 'READY', 'QUEUED', 'BLOCKED']) {
      assert.ok(result.some(t => t.state === state), `${state} should be included`);
    }
    for (const state of ['PENDING', 'COMPLETED', 'FAILED', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED']) {
      assert.ok(!result.some(t => t.state === state), `${state} should be excluded`);
    }
  });

  it('returns empty array for empty input', () => {
    assert.deepEqual(filterActiveTasks([]), []);
  });
});