import { logger } from '../utils/logger.js';
import { execa } from 'execa';
import path from 'path';

export class GrepTool {
  constructor() {
    this.name = 'grep';
    this.description = 'Search file contents using regex (ripgrep-backed)';
  }

  async execute(args) {
    const { pattern, path: searchPath = '.', file_glob, max_results = 20, context: ctx = 0 } = args;
    try {
      const cmdArgs = [
        '--max-count', String(max_results),
        '--no-heading',
        '--line-number',
        ...(ctx > 0 ? ['-C', String(ctx)] : []),
      ];
      if (file_glob) cmdArgs.push('--glob', file_glob);

      const targetPath = path.resolve(searchPath);
      cmdArgs.push('--', pattern, targetPath);

      const { stdout } = await execa('rg', cmdArgs, { timeout: 30000 });

      if (!stdout.trim()) return `🔍 No matches for "${pattern}" in ${searchPath}`;

      const lineCount = stdout.trim().split('\n').length;
      const suffix = lineCount >= max_results ? `\n(truncated at ${max_results} matches)` : '';
      return `🔍 ${lineCount} matches for "${pattern}" in ${searchPath}:${suffix}\n${stdout}`;
    } catch (e) {
      if (e.exitCode === 1) return `🔍 No matches for "${pattern}"`;
      if (e.exitCode === 2) return `❌ Grep error: ${e.stderr || e.message}`;
      return `❌ ${e.message}`;
    }
  }
}