// filter-tabs.test.mjs — TDD contract tests for filterTasksByTab
//
// filterTasksByTab is defined inline here to establish expected behaviour.
// Once filterTasksByTab is exported from web/app.js, remove the inline
// definition and import it instead.
//
// Run with: node --test web/test/filter-tabs.test.mjs

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

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

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

const ALL_STATES = [
  'PENDING', 'QUEUED', 'RUNNING', 'READY', 'BLOCKED',
  'COMPLETED', 'FAILED', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED',
];

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

describe('filterTasksByTab — active tab', () => {
  it('includes PENDING, QUEUED, RUNNING, READY, BLOCKED', () => {
    const tasks = ALL_STATES.map(makeTask);
    const result = filterTasksByTab(tasks, 'active');
    for (const state of ['PENDING', 'QUEUED', 'RUNNING', 'READY', 'BLOCKED']) {
      assert.ok(result.some(t => t.state === state), `${state} should be included`);
    }
  });

  it('excludes COMPLETED, FAILED, TIMED_OUT, CANCELLED, BUDGET_EXCEEDED', () => {
    const tasks = ALL_STATES.map(makeTask);
    const result = filterTasksByTab(tasks, 'active');
    for (const state of ['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(filterTasksByTab([], 'active'), []);
  });
});

describe('filterTasksByTab — done tab', () => {
  it('includes COMPLETED, FAILED, TIMED_OUT, CANCELLED, BUDGET_EXCEEDED', () => {
    const tasks = ALL_STATES.map(makeTask);
    const result = filterTasksByTab(tasks, 'done');
    for (const state of ['COMPLETED', 'FAILED', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED']) {
      assert.ok(result.some(t => t.state === state), `${state} should be included`);
    }
  });

  it('excludes PENDING, QUEUED, RUNNING, READY, BLOCKED', () => {
    const tasks = ALL_STATES.map(makeTask);
    const result = filterTasksByTab(tasks, 'done');
    for (const state of ['PENDING', 'QUEUED', 'RUNNING', 'READY', 'BLOCKED']) {
      assert.ok(!result.some(t => t.state === state), `${state} should be excluded`);
    }
  });

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

describe('filterTasksByTab — all tab', () => {
  it('returns all tasks unchanged', () => {
    const tasks = ALL_STATES.map(makeTask);
    const result = filterTasksByTab(tasks, 'all');
    assert.equal(result.length, ALL_STATES.length);
    assert.strictEqual(result, tasks, 'should return the same array reference');
  });

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

describe('filterTasksByTab — unknown tab', () => {
  it('returns all tasks as defensive fallback', () => {
    const tasks = ALL_STATES.map(makeTask);
    const result = filterTasksByTab(tasks, 'unknown-tab');
    assert.equal(result.length, ALL_STATES.length);
    assert.strictEqual(result, tasks, 'should return the same array reference');
  });
});