#!/usr/bin/env node

import { Command } from 'commander';
import { Meld } from '../src/meld';
import { existsSync } from 'fs';
import { writeFile } from 'fs/promises';
import { createInterface } from 'readline';

const program = new Command();

async function promptOverwrite(file: string): Promise<boolean> {
  const rl = createInterface({
    input: process.stdin,
    output: process.stdout
  });

  return new Promise((resolve) => {
    rl.question(`File ${file} already exists. Overwrite? [Y/n] `, (answer) => {
      rl.close();
      resolve(answer.toLowerCase() !== 'n');
    });
  });
}

program
  .name('meld')
  .description('Process a markdown file containing embedded commands')
  .argument('<input>', 'Input .meld.md file')
  .option('-o, --outfile <path>', 'Output file path')
  .option('--dry-run', 'Print commands that would be executed without running them')
  .option('--overwrite', 'Overwrite output file without prompting')
  .option('--debug', 'Enable debug logging')
  .action(async (input, options) => {
    try {
      const outputFile = options.outfile || input.replace(/\.meld\.md$/, '.md');
      
      // Check if file exists and we need to prompt
      if (existsSync(outputFile) && !options.overwrite) {
        const shouldOverwrite = await promptOverwrite(outputFile);
        if (!shouldOverwrite) {
          console.log('Aborted.');
          process.exit(0);
        }
      }

      const meld = new Meld({
        inputPath: input,
        workspacePath: process.cwd(),
        outputFile,
        dryRun: options.dryRun || false,
        debug: options.debug || false
      });

      const result = await meld.process();
      
      if (result.errors.length > 0) {
        console.error('Errors occurred during processing:');
        result.errors.forEach(error => console.error(`- ${error}`));
        process.exit(1);
      }

      if (options.dryRun) {
        console.log('\nCommands that would be executed:');
        console.log(result.content);
      } else {
        await writeFile(outputFile, result.content, 'utf-8');
        console.log(`🦾 ${input} → ${outputFile}`);
      }
    } catch (error: unknown) {
      if (error instanceof Error) {
        console.error('Error:', error.message);
      } else {
        console.error('An unknown error occurred:', error);
      }
      process.exit(1);
    }
  });

program.parse();