AI Configuration

# OpenRouter API Key (required for AI features)
OPENROUTER_API_KEY=sk-or-v1-...

# Your app URL (for OpenRouter analytics)
NEXT_PUBLIC_SITE_URL=http://localhost:3000

# Supabase (required for data storage)
NEXT_PUBLIC_SUPABASE_URL=your-supabase-url
NEXT_PUBLIC_SUPABASE_ANON_KEY=your-supabase-key

model: 'google/gemini-2.5-flash'

body: JSON.stringify({
  model: 'google/gemini-2.5-flash', // Change this
  messages: openRouterMessages,
  // ...
})

body: JSON.stringify({
  model: 'google/gemini-2.5-flash', // Change this
  messages: [...],
  // ...
})

// OpenAI GPT-4 Turbo
model: 'openai/gpt-4-turbo'

// OpenAI GPT-3.5 Turbo (cheaper)
model: 'openai/gpt-3.5-turbo'

// Google Gemini Pro
model: 'google/gemini-pro'

// Anthropic Claude 3.5 Sonnet
model: 'anthropic/claude-3.5-sonnet'

// OpenAI GPT-4 Vision
model: 'openai/gpt-4-vision-preview'

// Google Gemini Pro Vision
model: 'google/gemini-pro-vision'

// Anthropic Claude 3 Opus (best quality)
model: 'anthropic/claude-3-opus'

headers: {
  'Authorization': `Bearer ${process.env.OPENROUTER_API_KEY}`,
  'Content-Type': 'application/json',
  'HTTP-Referer': process.env.NEXT_PUBLIC_SITE_URL || 'http://localhost:3000',
  'X-Title': 'Sistema Financiero'
}

{
  model: 'google/gemini-2.5-flash',
  messages: [...],
  max_tokens: 1000,
  temperature: 0.7,
  tools: [...],          // Function definitions
  tool_choice: 'auto'    // Let AI decide when to call functions
}

{
  model: 'google/gemini-2.5-flash',
  messages: [
    {
      role: 'user',
      content: [
        { type: 'text', text: '...' },
        { type: 'image_url', image_url: { url: imageUrl } }
      ]
    }
  ],
  max_tokens: 400,
  temperature: 0.1,      // Lower temp for consistent extraction
  response_format: { type: 'json_object' }
}

// More creative (0.8-1.0)
temperature: 0.9

// Balanced (0.5-0.7)
temperature: 0.7

// More deterministic (0.0-0.3)
temperature: 0.1

// Short responses
max_tokens: 200

// Medium responses
max_tokens: 500

// Long responses
max_tokens: 2000

return NextResponse.json({
  response: assistantResponse,
  usage: data.usage,    // Token counts
  model: data.model     // Model used
})

{
  "prompt_tokens": 245,
  "completion_tokens": 89,
  "total_tokens": 334
}

const systemPrompt = `Eres un asistente financiero personal...

// Add your custom instructions here
`

tools: [
  {
    type: 'function',
    function: {
      name: 'your_custom_function',
      description: 'What it does',
      parameters: {
        type: 'object',
        properties: {
          // Define parameters
        },
        required: ['param1', 'param2']
      }
    }
  },
  // ... existing functions
]

// Available at /app/api/chat/stream/route.ts
POST /api/chat/stream

// Logged errors include:
console.error('Chat API error:', error)
console.error('Upload/OCR error:', error)
console.error('Vision API error:', errorText)