/**
 * Tests for session-end.js hook
 *
 * Run with: node tests/hooks/session-end.test.js
 */

const assert = require('assert');
const fs = require('fs');
const os = require('os');
const path = require('path');
const { spawnSync } = require('child_process');
const { getDateString, sanitizeSessionId } = require('../../scripts/lib/utils');

const script = path.join(__dirname, '..', '..', 'scripts', 'hooks', 'session-end.js');
const START = '<!-- ECC:SUMMARY:START -->';
const END = '<!-- ECC:SUMMARY:END -->';

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

function countOccurrences(haystack, needle) {
  let n = 0;
  let i = 0;
  while ((i = haystack.indexOf(needle, i)) !== -1) {
    n += 1;
    i += needle.length;
  }
  return n;
}

function isolatedHomeEnv(home) {
  return {
    ...process.env, HOME: home, USERPROFILE: home,
    ECC_AGENT_DATA_HOME: path.join(home, '.claude'),
    CLAUDE_CONFIG_DIR: path.join(home, '.claude')
  };
}

function runHook(home, transcript, env = {}) {
  return spawnSync(process.execPath, [script], {
    encoding: 'utf8',
    input: transcript ? JSON.stringify({ transcript_path: transcript }) : '',
    env: { ...isolatedHomeEnv(home), CLAUDE_SESSION_ID: '', ...env },
    timeout: 10000,
  });
}

function sessionFileFor(home, uuid, date = getDateString()) {
  const shortId = sanitizeSessionId(uuid.slice(-8).toLowerCase());
  return path.join(home, '.claude', 'session-data', `${date}-${shortId}-session.tmp`);
}

function runTests() {
  console.log('\n=== Testing session-end.js ===\n');

  let passed = 0;
  let failed = 0;

  // Regression: a user message containing $-sequences ($&, $$, $`, $') must be
  // written verbatim into the rewritten summary block. The block is fed to
  // String.prototype.replace as the replacement argument, where those sequences
  // are special — without escaping/a function replacer they corrupt the summary
  // (e.g. $& injects the entire matched old block, duplicating the markers).
  (test('preserves $-sequences in user messages when rewriting the summary block', () => {
    // Isolate HOME so getSessionsDir() resolves under a temp dir.
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-end-'));
    try {
      const sessionsDir = path.join(home, '.claude', 'session-data');
      fs.mkdirSync(sessionsDir, { recursive: true });

      // shortId is derived from the transcript filename UUID (last 8 chars).
      const uuid = 'abcdef12-3456-7890-abcd-ef0123456789';
      const shortId = sanitizeSessionId(uuid.slice(-8).toLowerCase());
      const today = getDateString();
      const sessionFile = path.join(sessionsDir, `${today}-${shortId}-session.tmp`);

      // Pre-seed a session file that already has summary markers, so the
      // idempotent rewrite path runs .replace() with the new summary block.
      fs.writeFileSync(
        sessionFile,
        `# Session: ${today}\n**Date:** ${today}\n---\n${START}\n## Session Summary\n\n### Tasks\n- old task\n${END}\n`
      );

      // Transcript whose user message contains replacement-special $-sequences.
      const userText = 'release $& fallback $$ done';
      const transcript = path.join(home, `${uuid}.jsonl`);
      fs.writeFileSync(
        transcript,
        [
          JSON.stringify({ type: 'user', message: { role: 'user', content: userText } }),
          JSON.stringify({ type: 'tool_use', tool_name: 'Edit', tool_input: { file_path: '/src/release.js' } }),
        ].join('\n') + '\n'
      );

      const res = spawnSync('node', [script], {
        encoding: 'utf8',
        input: JSON.stringify({ transcript_path: transcript }),
        env: { ...isolatedHomeEnv(home), CLAUDE_SESSION_ID: '' },
        timeout: 10000,
      });
      assert.strictEqual(res.status || 0, 0, `hook exited ${res.status}: ${res.stderr}`);

      const out = fs.readFileSync(sessionFile, 'utf8');
      // User text must survive verbatim (no $&/$$ interpretation).
      assert.ok(out.includes(`- ${userText}`), `expected verbatim user text in:\n${out}`);
      // Exactly one marker pair — a $& bug re-injects the matched block, duplicating markers.
      assert.strictEqual(countOccurrences(out, START), 1, `START marker should appear once:\n${out}`);
      assert.strictEqual(countOccurrences(out, END), 1, `END marker should appear once:\n${out}`);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('writes a session for a multi-message transcript', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-end-'));
    try {
      const uuid = '11111111-2222-4333-8444-555555555555';
      const transcript = path.join(home, `${uuid}.jsonl`);
      fs.writeFileSync(
        transcript,
        [
          JSON.stringify({ type: 'user', content: 'Investigate the failing hook' }),
          JSON.stringify({ type: 'user', content: 'Add regression coverage' }),
        ].join('\n') + '\n'
      );

      const res = runHook(home, transcript);
      assert.strictEqual(res.status || 0, 0, `hook exited ${res.status}: ${res.stderr}`);

      const sessionFile = sessionFileFor(home, uuid);
      const out = fs.readFileSync(sessionFile, 'utf8');
      assert.ok(out.includes(START), 'Should include the generated summary start marker');
      assert.ok(out.includes(END), 'Should include the generated summary end marker');
      assert.ok(out.includes('**Last Updated:**'), 'Should include session metadata');
      assert.ok(out.includes('Add regression coverage'), 'Should include the latest user task');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('writes a session for one user message with tool activity', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-end-'));
    try {
      const uuid = 'aaaaaaaa-bbbb-4ccc-8ddd-eeeeeeeeeeee';
      const transcript = path.join(home, `${uuid}.jsonl`);
      fs.writeFileSync(
        transcript,
        [
          JSON.stringify({ type: 'user', content: 'Fix the configuration' }),
          JSON.stringify({ type: 'tool_use', tool_name: 'Edit', tool_input: { file_path: '/src/config.js' } }),
        ].join('\n') + '\n'
      );

      const res = runHook(home, transcript);
      assert.strictEqual(res.status || 0, 0, `hook exited ${res.status}: ${res.stderr}`);
      assert.ok(fs.existsSync(sessionFileFor(home, uuid)), 'Tool activity should make the session eligible');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('writes a session for a normal one-message prompt without tool activity', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-end-'));
    try {
      const uuid = '12345678-1234-4234-8234-123456789abc';
      const transcript = path.join(home, `${uuid}.jsonl`);
      fs.writeFileSync(transcript, JSON.stringify({ type: 'user', content: 'Print the current version' }) + '\n');

      const res = runHook(home, transcript);
      assert.strictEqual(res.status || 0, 0, `hook exited ${res.status}: ${res.stderr}`);
      assert.ok(fs.existsSync(sessionFileFor(home, uuid)), 'A normal short user session should remain resumable');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('skips a one-message summarizer-style transcript without prompt matching', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-end-'));
    try {
      const uuid = 'fedcba98-7654-4321-8765-fedcba987654';
      const transcript = path.join(home, `${uuid}.jsonl`);
      fs.writeFileSync(
        transcript,
        [
          JSON.stringify({ type: 'user', message: { role: 'user', content: 'Summarize the supplied conversation as concise markdown.' } }),
          JSON.stringify({ type: 'assistant', message: { role: 'assistant', content: '## Summary\nThe hook behavior was reviewed.' } }),
        ].join('\n') + '\n'
      );

      const res = runHook(home, transcript, { ECC_LLM_SUMMARY_SUBPROCESS: '1' });
      assert.strictEqual(res.status || 0, 0, `hook exited ${res.status}: ${res.stderr}`);
      assert.ok(!fs.existsSync(sessionFileFor(home, uuid)), 'Summarizer subprocess should not create a session file');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('does not rewrite an existing session for a rejected transcript', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-end-'));
    try {
      const uuid = '99999999-8888-4777-8666-555555555555';
      const transcript = path.join(home, `${uuid}.jsonl`);
      const sessionFile = sessionFileFor(home, uuid);
      const original = '# Session: preserved\n**Last Updated:** 09:00\n\n---\n\nUser-authored context\n';
      const originalTime = new Date('2026-01-02T03:04:05.000Z');

      fs.mkdirSync(path.dirname(sessionFile), { recursive: true });
      fs.writeFileSync(sessionFile, original);
      fs.utimesSync(sessionFile, originalTime, originalTime);
      fs.writeFileSync(transcript, JSON.stringify({ type: 'user', content: 'Internal summary request' }) + '\n');

      const res = runHook(home, transcript, { ECC_LLM_SUMMARY_SUBPROCESS: '1' });
      assert.strictEqual(res.status || 0, 0, `hook exited ${res.status}: ${res.stderr}`);
      assert.strictEqual(fs.readFileSync(sessionFile, 'utf8'), original, 'Internal summarizer should not change existing content');
      assert.strictEqual(fs.statSync(sessionFile).mtimeMs, originalTime.getTime(), 'Internal summarizer should not advance mtime');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('keeps fallback behavior when transcript metadata is malformed', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-end-'));
    try {
      const res = spawnSync('node', [script], {
        encoding: 'utf8',
        input: '{not-json',
        env: { ...isolatedHomeEnv(home), CLAUDE_SESSION_ID: 'fallback-session-12345678', CLAUDE_TRANSCRIPT_PATH: '' },
        timeout: 10000,
      });
      assert.strictEqual(res.status || 0, 0, `hook exited ${res.status}: ${res.stderr}`);

      const sessionsDir = path.join(home, '.claude', 'session-data');
      assert.strictEqual(fs.readdirSync(sessionsDir).filter(name => name.endsWith('-session.tmp')).length, 1, 'Fallback should still create the placeholder session');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('persists mechanical resume state when the LLM budget is exhausted', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-budget-'));
    try {
      const uuid = '12345678-1234-4234-8234-123456789abc';
      const transcript = path.join(home, `${uuid}.jsonl`);
      fs.writeFileSync(transcript, JSON.stringify({ type: 'user', content: 'Keep this task resumable' }) + '\n');
      const bin = path.join(home, 'empty-bin');
      fs.mkdirSync(bin);
      const res = runHook(home, transcript, {
        ECC_LLM_SUMMARY_INTERVAL: '1', ECC_HOOK_DEADLINE_MS: '1',
        ECC_SKIP_LLM_SUMMARY: '', ECC_LLM_SUMMARY_SUBPROCESS: '', PATH: bin
      });
      assert.strictEqual(res.status, 0, res.stderr);
      assert.match(res.stderr, /LLM summary skipped.*insufficient lifecycle time budget/);
      assert.doesNotMatch(res.stderr, /LLM summary failed/);
      assert.match(fs.readFileSync(sessionFileFor(home, uuid), 'utf8'), /Keep this task resumable/);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  (test('logs an explicit LLM disable as skipped and persists mechanical resume state', () => {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-skip-'));
    try {
      const uuid = '12345678-1234-4234-8234-123456789abc';
      const transcript = path.join(home, `${uuid}.jsonl`);
      const bin = path.join(home, 'empty-bin');
      fs.mkdirSync(bin);
      fs.writeFileSync(transcript, JSON.stringify({ type: 'user', content: 'Save context with LLM disabled' }) + '\n');
      const res = runHook(home, transcript, {
        ECC_LLM_SUMMARY_INTERVAL: '1', ECC_SKIP_LLM_SUMMARY: '1',
        ECC_LLM_SUMMARY_SUBPROCESS: '', PATH: bin
      });
      assert.strictEqual(res.status, 0, res.stderr);
      assert.match(res.stderr, /LLM summary skipped.*ECC_SKIP_LLM_SUMMARY/);
      assert.doesNotMatch(res.stderr, /LLM summary failed/);
      assert.match(fs.readFileSync(sessionFileFor(home, uuid), 'utf8'), /Save context with LLM disabled/);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  }) ? passed++ : failed++);

  for (const inherited of ['', String(Date.now() + 300000), '1']) {
    (test(`direct legacy runner bounds the deadline ${inherited || '(unset)'}`, () => {
      const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-runner-budget-'));
      try {
        const relative = 'legacy.js';
        fs.writeFileSync(path.join(home, relative), "process.stdout.write(JSON.stringify({deadline:Number(process.env.ECC_HOOK_DEADLINE_MS),now:Date.now()}));\n");
        const runner = path.resolve(__dirname, '../../scripts/hooks/run-with-flags.js');
        const res = spawnSync(process.execPath, [runner, 'session:stop:session-end', relative, 'standard'], {
          input: '{}', encoding: 'utf8', timeout: 5000,
          env: {
            ...isolatedHomeEnv(home), CLAUDE_PLUGIN_ROOT: home,
            ECC_HOOK_PROFILE: 'standard', ECC_DISABLED_HOOKS: '', ECC_DRY_RUN: '0', ECC_HOOKS_ENABLED: 'true',
            ECC_HOOK_DEADLINE_MS: inherited
          }
        });
        assert.strictEqual(res.status, 0, res.stderr);
        if (inherited === '1') {
          assert.strictEqual(res.stdout, '');
          assert.match(res.stderr, /time budget exhausted/);
        } else {
          const result = JSON.parse(res.stdout);
          assert.ok(result.deadline > result.now);
          assert.ok(result.deadline - result.now <= 30000, 'Inherited far-future deadlines must not extend the runner budget');
        }
      } finally {
        fs.rmSync(home, { recursive: true, force: true });
      }
    }) ? passed++ : failed++);
  }

  // A local stand-in exercises the actual bootstrap -> runner -> Stop hook ->
  // child timeout chain without invoking Claude or using authentication.
  if (process.platform !== 'win32') {
    (test('times out a slow summarizer across a calendar-day rollover and saves fallback', () => {
      const home = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-session-budget-'));
      try {
        const uuid = '12345678-1234-4234-8234-123456789abc';
        const transcript = path.join(home, `${uuid}.jsonl`);
        const bin = path.join(home, 'bin');
        const started = path.join(home, 'started');
        const calendarAfter = path.join(home, 'calendar-after');
        const calendarPreload = path.join(home, 'calendar.cjs');
        const summarizer = path.join(home, 'summarizer.cjs');
        const sessionDate = '2000-01-01';
        const nextDate = '2000-01-02';
        const utils = path.resolve(__dirname, '../../scripts/lib/utils.js');
        fs.mkdirSync(bin);
        // Only the calendar helper changes. Date.now and the actual lifecycle
        // deadline stay real while the summarizer crosses into the next day.
        fs.writeFileSync(calendarPreload, [
          "const fs = require('node:fs');",
          'require(process.env.ECC_SESSION_TEST_UTILS).getDateString = () =>',
          '  fs.existsSync(process.env.ECC_SESSION_TEST_STARTED)',
          '    ? process.env.ECC_SESSION_TEST_NEXT_DATE : process.env.ECC_SESSION_TEST_DATE;',
          ''
        ].join('\n'));
        fs.writeFileSync(transcript, JSON.stringify({ type: 'user', content: 'Persist after a slow summary' }) + '\n');
        fs.writeFileSync(summarizer, [
          "const fs = require('node:fs');",
          "fs.writeFileSync(process.env.ECC_SESSION_TEST_STARTED, 'started');",
          'fs.writeFileSync(process.env.ECC_SESSION_TEST_CALENDAR_AFTER,',
          '  require(process.env.ECC_SESSION_TEST_UTILS).getDateString());',
          "setTimeout(() => console.log('late summary'), 5000);",
          ''
        ].join('\n'));
        fs.writeFileSync(path.join(bin, 'claude'), '#!/bin/sh\nexec "$ECC_SESSION_TEST_NODE" "$ECC_SESSION_TEST_SUMMARIZER"\n', { mode: 0o755 });
        const root = path.resolve(__dirname, '../..');
        const bootstrap = path.join(root, 'scripts/hooks/lifecycle-hook-bootstrap.js');
        const res = spawnSync(process.execPath, [bootstrap, 'session:stop:session-end', 'scripts/hooks/session-end.js', 'minimal,standard,strict', '2500'], {
          encoding: 'utf8', input: JSON.stringify({ transcript_path: transcript }),
          env: {
            ...isolatedHomeEnv(home), PATH: bin,
            NODE_OPTIONS: `--require ${JSON.stringify(calendarPreload)}`,
            ECC_SESSION_TEST_NODE: process.execPath,
            ECC_SESSION_TEST_SUMMARIZER: summarizer,
            ECC_SESSION_TEST_UTILS: utils,
            ECC_SESSION_TEST_STARTED: started,
            ECC_SESSION_TEST_CALENDAR_AFTER: calendarAfter,
            ECC_SESSION_TEST_DATE: sessionDate,
            ECC_SESSION_TEST_NEXT_DATE: nextDate,
            CLAUDE_PLUGIN_ROOT: root, ECC_HOOK_PROFILE: 'standard',
            ECC_LLM_SUMMARY_INTERVAL: '1', ECC_SKIP_LLM_SUMMARY: '',
            ECC_LLM_SUMMARY_SUBPROCESS: '', ECC_HOOK_DEADLINE_MS: '1',
            ECC_DISABLED_HOOKS: '', ECC_DRY_RUN: '0', ECC_HOOKS_ENABLED: 'true'
          },
          timeout: 7000
        });
        assert.strictEqual(res.status, 0, res.stderr);
        assert.ok(fs.existsSync(started), 'Fresh bootstrap must replace an inherited expired deadline');
        assert.strictEqual(fs.readFileSync(calendarAfter, 'utf8'), nextDate, 'The summarizer must advance the fixture calendar');
        assert.match(res.stderr, /LLM summary failed; falling back/);
        assert.doesNotMatch(res.stderr, /lifecycle runner failed/);
        const saved = fs.readFileSync(sessionFileFor(home, uuid, sessionDate), 'utf8');
        assert.match(saved, /Persist after a slow summary/);
        assert.ok(saved.includes(`**Date:** ${sessionDate}`), 'Resume metadata must retain the date captured before summarization');
        assert.ok(!fs.existsSync(sessionFileFor(home, uuid, nextDate)), 'Rollover must not create a second session file');
      } finally {
        fs.rmSync(home, { recursive: true, force: true });
      }
    }) ? passed++ : failed++);
  }

  console.log(`\nResults: Passed: ${passed}, Failed: ${failed}`);
  process.exit(failed > 0 ? 1 : 0);
}

runTests();