import { NextRequest, NextResponse } from 'next/server';

const INFERENCE_API_URL = process.env.INFERENCE_API_URL || 'http://localhost:8001';
const INFERENCE_API_TIMEOUT = parseInt(process.env.INFERENCE_API_TIMEOUT || '10000', 10);

export async function DELETE(
  _request: NextRequest,
  { params }: { params: Promise<{ run_id: string }> }
) {
  const { run_id } = await params;

  // Validate run_id format before using in interpolation
  const RUN_ID_REGEX = /^[a-zA-Z0-9_-]+$/;
  if (!RUN_ID_REGEX.test(run_id)) {
    return NextResponse.json(
      { error: 'Invalid run_id format' },
      { status: 400 }
    );
  }

  const controller = new AbortController();
  const timeoutId = setTimeout(() => controller.abort(), INFERENCE_API_TIMEOUT);

  try {
    const response = await fetch(`${INFERENCE_API_URL}/training/runs/${run_id}`, {
      method: 'DELETE',
      headers: { 'X-API-Key': process.env.API_KEY || '' },
      signal: controller.signal,
    });
    clearTimeout(timeoutId);

    const data = await response.json();
    if (!response.ok) {
      return NextResponse.json({ error: data.detail || 'Failed to delete run' }, { status: response.status });
    }
    return NextResponse.json(data);
  } catch (error: any) {
    clearTimeout(timeoutId);
    if (error.name === 'AbortError') {
      return NextResponse.json({ error: 'Request timed out' }, { status: 504 });
    }
    if (error.cause?.code === 'ECONNREFUSED' || error.message?.includes('fetch failed')) {
      return NextResponse.json({ error: 'Inference service unavailable' }, { status: 503 });
    }
    console.error('training/runs DELETE proxy error:', error);
    return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
  }
}
