// Chat proxy - routes requests to n8n workflow
// Path: /chat

async function handler(request) {
  const corsHeaders = {
    'Access-Control-Allow-Origin': '*',
    'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
    'Access-Control-Allow-Headers': 'Content-Type, Authorization',
    'Content-Type': 'application/json'
  }

  if (request.method === 'OPTIONS') {
    return new Response('', { headers: corsHeaders })
  }

  if (request.method !== 'POST') {
    return new Response(JSON.stringify({ error: 'Method not allowed' }), {
      status: 405,
      headers: corsHeaders
    })
  }

  try {
    const body = await request.json()
    const message = body.message
    const project_id = body.project_id
    const user_id = body.user_id
    const provider = body.provider || 'zai'

    if (!message) {
      return new Response(JSON.stringify({ error: 'Message is required' }), {
        status: 400,
        headers: corsHeaders
      })
    }

    // Forward to n8n webhook
    const n8nResponse = await fetch('https://n8n.mylder.io/webhook/chat', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        message: message,
        project_id: project_id || null,
        user_id: user_id || null,
        provider: provider,
        source: 'wws-proxy',
        timestamp: new Date().toISOString()
      })
    })

    const result = await n8nResponse.json()

    return new Response(JSON.stringify({
      success: true,
      response: result.response || result,
      provider: provider,
      timestamp: new Date().toISOString()
    }), {
      headers: corsHeaders
    })

  } catch (error) {
    return new Response(JSON.stringify({
      success: false,
      error: error.message || 'Internal server error'
    }), {
      status: 500,
      headers: corsHeaders
    })
  }
}

// ES Module export for wws
export default handler