#!/usr/bin/env node
'use strict';

const MAX_STDIN = 1024 * 1024;

function splitShellSegments(command) {
  const segments = [];
  let current = '';
  let quote = null;

  for (let i = 0; i < command.length; i++) {
    const ch = command[i];
    if (quote) {
      if (ch === quote) quote = null;
      current += ch;
      continue;
    }

    if (ch === '"' || ch === "'") {
      quote = ch;
      current += ch;
      continue;
    }

    const next = command[i + 1] || '';
    if (ch === ';' || (ch === '&' && next === '&') || (ch === '|' && next === '|') || (ch === '&' && next !== '&')) {
      if (current.trim()) segments.push(current.trim());
      current = '';
      if ((ch === '&' && next === '&') || (ch === '|' && next === '|')) i++;
      continue;
    }

    current += ch;
  }

  if (current.trim()) segments.push(current.trim());
  return segments;
}

let raw = '';
process.stdin.setEncoding('utf8');
process.stdin.on('data', chunk => {
  if (raw.length < MAX_STDIN) {
    const remaining = MAX_STDIN - raw.length;
    raw += chunk.substring(0, remaining);
  }
});

process.stdin.on('end', () => {
  try {
    const input = JSON.parse(raw);
    const cmd = String(input.tool_input?.command || '');

    if (process.platform !== 'win32') {
      const segments = splitShellSegments(cmd);
      const tmuxLauncher = /^\s*tmux\s+(new|new-session|new-window|split-window)\b/;
      const devPattern = /\b(npm\s+run\s+dev|pnpm(?:\s+run)?\s+dev|yarn\s+dev|bun\s+run\s+dev)\b/;

      const hasBlockedDev = segments.some(segment => devPattern.test(segment) && !tmuxLauncher.test(segment));

      if (hasBlockedDev) {
        console.error('[Hook] BLOCKED: Dev server must run in tmux for log access');
        console.error('[Hook] Use: tmux new-session -d -s dev "npm run dev"');
        console.error('[Hook] Then: tmux attach -t dev');
        process.exit(2);
      }
    }
  } catch {
    // ignore parse errors and pass through
  }

  process.stdout.write(raw);
});