/**
 * Integration tests for scripts/hooks/plan-canvas-pending.js (Stop)
 *
 * The hook is the delivery guarantee for canvas chat: without it, feedback the
 * human sends while no `await` is parked simply never reaches the agent.
 *
 * Run with: node tests/hooks/plan-canvas-pending-hook.test.js
 */

const assert = require('assert');
const fs = require('fs');
const os = require('os');
const path = require('path');

const HOOK = path.join(__dirname, '..', '..', 'scripts', 'hooks', 'plan-canvas-pending.js');

async function test(name, fn) {
  try {
    await fn();
    console.log(`  ✓ ${name}`);
    return true;
  } catch (err) {
    console.log(`  ✗ ${name}`);
    console.log(`    Error: ${err.message}`);
    return false;
  }
}

function freshStateDir() {
  return fs.mkdtempSync(path.join(os.tmpdir(), 'plan-canvas-pending-'));
}

function writeState(stateDir, sessions) {
  fs.mkdirSync(stateDir, { recursive: true });
  fs.writeFileSync(path.join(stateDir, 'sessions.json'), JSON.stringify({ sessions, feedbackCounter: 0 }, null, 2));
}

function sessionRecord(key, file, pendingFeedback, overrides = {}) {
  const at = '2026-01-01T00:00:00.000Z';
  return {
    key,
    file,
    status: pendingFeedback.length ? 'feedback' : 'open',
    chat: [],
    pendingFeedback,
    createdAt: at,
    updatedAt: at,
    ...overrides
  };
}

function readPending(stateDir, key) {
  const state = JSON.parse(fs.readFileSync(path.join(stateDir, 'sessions.json'), 'utf8'));
  return state.sessions[key].pendingFeedback;
}

// The hook resolves the state dir at call time, so the env var has to be set
// before each invocation; a fresh require keeps the cases independent.
function loadHook(stateDir) {
  delete require.cache[require.resolve(HOOK)];
  process.env.ECC_PLAN_CANVAS_STATE_DIR = stateDir;
  return require(HOOK);
}

async function runTests() {
  console.log('\n=== Testing plan-canvas-pending Stop hook ===\n');
  let passed = 0;
  let failed = 0;
  const originalStateDir = process.env.ECC_PLAN_CANVAS_STATE_DIR;

  if (await test('blocks the stop and hands over undelivered feedback', async () => {
    const stateDir = freshStateDir();
    const projectDir = fs.mkdtempSync(path.join(os.tmpdir(), 'plan-canvas-project-'));
    const artifact = path.join(projectDir, 'feature.plan.md');
    writeState(stateDir, {
      aaaaaaaaaaaa: sessionRecord('aaaaaaaaaaaa', artifact, [
        { id: 'fb-1', kind: 'chat', text: 'move phase 2 up', at: '2026-01-01T00:00:00.000Z' }
      ])
    });
    const hook = loadHook(stateDir);
    const result = await hook.run(JSON.stringify({ cwd: projectDir, stop_hook_active: false }));
    const decision = JSON.parse(result.stdout);
    assert.strictEqual(decision.decision, 'block');
    assert.ok(decision.reason.includes('move phase 2 up'), 'reason carries the message text');
    assert.ok(decision.reason.includes('--reply'), 'reason tells the agent to answer in the canvas');
    // Drained, so the next Stop does not block on the same message.
    assert.deepStrictEqual(readPending(stateDir, 'aaaaaaaaaaaa'), []);
  })) passed++; else failed++;

  if (await test('a drained queue does not block a second time', async () => {
    const stateDir = freshStateDir();
    const projectDir = fs.mkdtempSync(path.join(os.tmpdir(), 'plan-canvas-project-'));
    const artifact = path.join(projectDir, 'feature.plan.md');
    writeState(stateDir, {
      aaaaaaaaaaaa: sessionRecord('aaaaaaaaaaaa', artifact, [
        { id: 'fb-1', kind: 'chat', text: 'first', at: '2026-01-01T00:00:00.000Z' }
      ])
    });
    const hook = loadHook(stateDir);
    const input = JSON.stringify({ cwd: projectDir });
    const first = await hook.run(input);
    assert.strictEqual(JSON.parse(first.stdout).decision, 'block');
    const second = await hook.run(input);
    assert.strictEqual(second.stdout, input, 'second stop passes stdin through');
  })) passed++; else failed++;

  if (await test('never blocks twice in a row via stop_hook_active', async () => {
    const stateDir = freshStateDir();
    const projectDir = fs.mkdtempSync(path.join(os.tmpdir(), 'plan-canvas-project-'));
    writeState(stateDir, {
      aaaaaaaaaaaa: sessionRecord('aaaaaaaaaaaa', path.join(projectDir, 'a.plan.md'), [
        { id: 'fb-1', kind: 'chat', text: 'hello', at: '2026-01-01T00:00:00.000Z' }
      ])
    });
    const hook = loadHook(stateDir);
    const input = JSON.stringify({ cwd: projectDir, stop_hook_active: true });
    const result = await hook.run(input);
    assert.strictEqual(result.stdout, input);
    assert.strictEqual(readPending(stateDir, 'aaaaaaaaaaaa').length, 1, 'nothing drained');
  })) passed++; else failed++;

  if (await test('ignores sessions outside the project, unless scope=all', async () => {
    const stateDir = freshStateDir();
    const projectDir = fs.mkdtempSync(path.join(os.tmpdir(), 'plan-canvas-project-'));
    const otherDir = fs.mkdtempSync(path.join(os.tmpdir(), 'plan-canvas-other-'));
    const state = {
      bbbbbbbbbbbb: sessionRecord('bbbbbbbbbbbb', path.join(otherDir, 'other.plan.md'), [
        { id: 'fb-1', kind: 'chat', text: 'not yours', at: '2026-01-01T00:00:00.000Z' }
      ])
    };
    writeState(stateDir, state);
    const hook = loadHook(stateDir);
    assert.strictEqual(hook.pendingSessions({ sessions: state }, projectDir, {}).length, 0);
    assert.strictEqual(
      hook.pendingSessions({ sessions: state }, projectDir, { ECC_PLAN_CANVAS_STOP_SCOPE: 'all' }).length,
      1
    );
  })) passed++; else failed++;

  if (await test('ended sessions and empty queues are left alone', async () => {
    const stateDir = freshStateDir();
    const projectDir = fs.mkdtempSync(path.join(os.tmpdir(), 'plan-canvas-project-'));
    const state = {
      cccccccccccc: sessionRecord(
        'cccccccccccc',
        path.join(projectDir, 'ended.plan.md'),
        [{ id: 'fb-1', kind: 'chat', text: 'stale', at: '2026-01-01T00:00:00.000Z' }],
        { status: 'ended', endedBy: 'user' }
      ),
      dddddddddddd: sessionRecord('dddddddddddd', path.join(projectDir, 'quiet.plan.md'), [])
    };
    writeState(stateDir, state);
    const hook = loadHook(stateDir);
    assert.strictEqual(hook.pendingSessions({ sessions: state }, projectDir, {}).length, 0);
    const input = JSON.stringify({ cwd: projectDir });
    assert.strictEqual((await hook.run(input)).stdout, input);
  })) passed++; else failed++;

  if (await test('renders annotations and verdicts readably', async () => {
    const hook = loadHook(freshStateDir());
    assert.strictEqual(
      hook.describeItem({ kind: 'annotation', text: 'split this', anchor: { snippet: 'Phase 2' } }),
      'on "Phase 2": split this'
    );
    assert.strictEqual(hook.describeItem({ kind: 'verdict', verdict: 'approve' }), 'APPROVED the plan');
    assert.strictEqual(
      hook.describeItem({ kind: 'verdict', verdict: 'request-changes', text: 'too vague' }),
      'REQUESTED CHANGES: too vague'
    );
    assert.strictEqual(hook.describeItem({ kind: 'chat', text: '' }), null);
    assert.strictEqual(hook.describeItem(null), null);
  })) passed++; else failed++;

  if (await test('malformed stdin and a missing state dir fail open', async () => {
    const hook = loadHook(path.join(os.tmpdir(), 'plan-canvas-does-not-exist-xyz'));
    assert.strictEqual((await hook.run('not json')).stdout, 'not json');
    assert.strictEqual((await hook.run('{}')).exitCode, 0);
  })) passed++; else failed++;

  if (originalStateDir === undefined) delete process.env.ECC_PLAN_CANVAS_STATE_DIR;
  else process.env.ECC_PLAN_CANVAS_STATE_DIR = originalStateDir;

  console.log('\n========================================');
  console.log(`Passed: ${passed}`);
  console.log(`Failed: ${failed}`);
  console.log('========================================\n');
  return failed === 0;
}

if (require.main === module) {
  runTests().then(ok => process.exit(ok ? 0 : 1));
}

module.exports = { runTests };