#!/usr/bin/env node
/**
 * Hook Approval Pattern Tracker - Enforces inst_061
 * Persists user approval for "don't ask again for similar commands" in session
 *
 * When user selects option: "Yes, and don't ask again for similar commands in [directory]"
 * This hook ensures Claude Code remembers and doesn't ask again during the same session.
 */

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

const SESSION_STATE = path.join(__dirname, '../session-state.json');
const APPROVAL_CACHE = path.join(__dirname, '../approval-cache.json');

function loadApprovalCache() {
  if (!fs.existsSync(APPROVAL_CACHE)) {
    return {
      sessionId: null,
      approvals: []
    };
  }
  return JSON.parse(fs.readFileSync(APPROVAL_CACHE, 'utf8'));
}

function saveApprovalCache(cache) {
  fs.writeFileSync(APPROVAL_CACHE, JSON.stringify(cache, null, 2));
}

function getCurrentSession() {
  if (!fs.existsSync(SESSION_STATE)) {
    return null;
  }
  const state = JSON.parse(fs.readFileSync(SESSION_STATE, 'utf8'));
  return state.sessionId;
}

function recordApproval(commandType, directory) {
  const cache = loadApprovalCache();
  const currentSession = getCurrentSession();

  // Reset cache if session changed
  if (cache.sessionId !== currentSession) {
    cache.sessionId = currentSession;
    cache.approvals = [];
  }

  // Add approval
  cache.approvals.push({
    timestamp: new Date().toISOString(),
    commandType,
    directory,
    sessionId: currentSession
  });

  saveApprovalCache(cache);

  console.log(`\n✅ Approval cached (inst_061)`);
  console.log(`   Command: ${commandType}`);
  console.log(`   Directory: ${directory}`);
  console.log(`   Session: ${currentSession}\n`);
}

function checkApproval(commandType, directory) {
  const cache = loadApprovalCache();
  const currentSession = getCurrentSession();

  // If session changed, cache is stale
  if (cache.sessionId !== currentSession) {
    return false;
  }

  // Check for matching approval
  const match = cache.approvals.find(a =>
    a.commandType === commandType &&
    (a.directory === directory || directory.startsWith(a.directory))
  );

  return !!match;
}

function listApprovals() {
  const cache = loadApprovalCache();
  const currentSession = getCurrentSession();

  if (cache.sessionId !== currentSession) {
    console.log('\n✅ No approvals cached for current session\n');
    return;
  }

  if (cache.approvals.length === 0) {
    console.log('\n✅ No approvals cached for current session\n');
    return;
  }

  console.log(`\n📋 Cached Approvals (Session: ${currentSession})\n`);
  console.log('━'.repeat(70));

  cache.approvals.forEach((approval, idx) => {
    console.log(`\n${idx + 1}. ${approval.commandType} in ${approval.directory}`);
    console.log(`   Approved: ${new Date(approval.timestamp).toLocaleString()}`);
  });

  console.log('\n' + '━'.repeat(70));
  console.log('\nThese commands will not trigger approval prompts again this session.\n');
}

function main() {
  const command = process.argv[2];

  if (!command || command === 'list') {
    listApprovals();
    return;
  }

  if (command === 'record') {
    const commandType = process.argv[3];
    const directory = process.argv[4];

    if (!commandType || !directory) {
      console.log('Usage: track-approval-patterns.js record <command-type> <directory>');
      console.log('');
      console.log('Example:');
      console.log('  track-approval-patterns.js record "git status" /home/user/project');
      process.exit(1);
    }

    recordApproval(commandType, directory);
  } else if (command === 'check') {
    const commandType = process.argv[3];
    const directory = process.argv[4];

    if (!commandType || !directory) {
      console.log('Usage: track-approval-patterns.js check <command-type> <directory>');
      process.exit(1);
    }

    const approved = checkApproval(commandType, directory);
    if (approved) {
      console.log(`✅ Approval cached - skip prompt`);
      process.exit(0);
    } else {
      console.log(`❌ No approval cached - show prompt`);
      process.exit(1);
    }
  } else {
    console.log('Usage: track-approval-patterns.js [list|record|check]');
    console.log('');
    console.log('Commands:');
    console.log('  list                                     - List cached approvals');
    console.log('  record <command-type> <directory>        - Record approval');
    console.log('  check <command-type> <directory>         - Check if approved');
  }
}

main();