import { NextResponse } from 'next/server';
import * as fs from 'fs';
import * as path from 'path';

export async function GET() {
  const analysesDir = path.resolve(process.cwd(), '..', 'analyses');

  try {
    if (!fs.existsSync(analysesDir)) {
      return NextResponse.json({ discoveries: [] });
    }

    const files = fs.readdirSync(analysesDir)
      .filter(f => f.startsWith('discovery_') && f.endsWith('.json'))
      .sort((a, b) => b.localeCompare(a)); // Newest first

    const discoveries = files.map(file => {
      const filePath = path.join(analysesDir, file);
      const content = fs.readFileSync(filePath, 'utf-8');
      const data = JSON.parse(content);

      return {
        id: data.id,
        capability_gap: data.capability_gap,
        timestamp: data.timestamp,
        candidate_count: data.candidates?.length || 0,
        top_score: data.candidates?.[0]?.score || 0,
      };
    });

    return NextResponse.json({ discoveries });
  } catch (error) {
    console.error('Failed to list discoveries:', error);
    return NextResponse.json({ discoveries: [], error: String(error) });
  }
}