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

const questionsDir = path.resolve(__dirname, '../src/data/questions');
const outputFile = path.resolve(__dirname, '../src/data/demoQuestions.ts');

const jsonlFiles = fs
  .readdirSync(questionsDir)
  .filter(name => name.endsWith('.jsonl'))
  .sort();

const allQuestions = [];

for (const file of jsonlFiles) {
  const filePath = path.join(questionsDir, file);
  const raw = fs.readFileSync(filePath, 'utf-8');
  const lines = raw
    .split('\n')
    .map(line => line.trim())
    .filter(line => line.length > 0 && !line.startsWith('#'));

  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    try {
      const question = JSON.parse(line);
      allQuestions.push(question);
    } catch (error) {
      console.error(`Parse error in ${file} at line ${i + 1}:`, line);
      process.exit(1);
    }
  }
}

const output = `import { Question } from '@/types/question';

// 本文件由 scripts/build-questions.js 自动生成，请勿手动编辑
// 题库源文件位于 src/data/questions/*.jsonl
// 用于「导入示例题库」功能

export const demoQuestions: Question[] = ${JSON.stringify(allQuestions, null, 2)};

export default demoQuestions;
`;

fs.writeFileSync(outputFile, output, 'utf-8');
console.log(`Generated ${outputFile} with ${allQuestions.length} questions from ${jsonlFiles.length} JSONL files.`);