#!/usr/bin/env node
/**
 * Cursor-to-Claude Code Hook Adapter
 * Transforms Cursor stdin JSON to Claude Code hook format,
 * then delegates to existing scripts/hooks/*.js
 */

const { execFileSync } = require('child_process');
const path = require('path');

const MAX_STDIN = 1024 * 1024;

function readStdin() {
  return new Promise((resolve) => {
    let data = '';
    process.stdin.setEncoding('utf8');
    process.stdin.on('data', chunk => {
      if (data.length < MAX_STDIN) data += chunk.substring(0, MAX_STDIN - data.length);
    });
    process.stdin.on('end', () => resolve(data));
  });
}

function getPluginRoot() {
  return path.resolve(__dirname, '..', '..');
}

function transformToClaude(cursorInput, overrides = {}) {
  return {
    tool_input: {
      command: cursorInput.command || cursorInput.args?.command || '',
      file_path: cursorInput.path || cursorInput.file || '',
      ...overrides.tool_input,
    },
    tool_output: {
      output: cursorInput.output || cursorInput.result || '',
      ...overrides.tool_output,
    },
    _cursor: {
      conversation_id: cursorInput.conversation_id,
      hook_event_name: cursorInput.hook_event_name,
      workspace_roots: cursorInput.workspace_roots,
      model: cursorInput.model,
    },
  };
}

function runExistingHook(scriptName, stdinData) {
  const scriptPath = path.join(getPluginRoot(), 'scripts', 'hooks', scriptName);
  try {
    execFileSync('node', [scriptPath], {
      input: typeof stdinData === 'string' ? stdinData : JSON.stringify(stdinData),
      stdio: ['pipe', 'pipe', 'pipe'],
      timeout: 15000,
      cwd: process.cwd(),
    });
  } catch (e) {
    if (e.status === 2) process.exit(2); // Forward blocking exit code
  }
}

module.exports = { readStdin, getPluginRoot, transformToClaude, runExistingHook };