import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic({
  apiKey: process.env.ANTHROPIC_API_KEY,
});

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  messages: [
    { role: 'user', content: 'Hello, Claude!' },
  ],
});

console.log(message.content[0].text);

const response = await fetch('https://api.anthropic.com/v1/messages', {
  method: 'POST',
  headers: {
    'x-api-key': env.ANTHROPIC_API_KEY,
    'anthropic-version': '2023-06-01',
    'content-type': 'application/json',
  },
  body: JSON.stringify({
    model: 'claude-sonnet-4-5-20250929',
    max_tokens: 1024,
    messages: [{ role: 'user', content: 'Hello!' }],
  }),
});

const data = await response.json();
console.log(data.content[0].text);

async function handleRateLimit(requestFn, maxRetries = 3) {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    try {
      return await requestFn();
    } catch (error) {
      if (error.status === 429) {
        const retryAfter = error.response?.headers?.['retry-after'];
        const delay = retryAfter ? parseInt(retryAfter) * 1000 : 1000 * Math.pow(2, attempt);
        await new Promise(resolve => setTimeout(resolve, delay));
      } else {
        throw error;
      }
    }
  }
}

// ❌ Wrong - cache_control not at end
{
  type: 'text',
  text: DOCUMENT,
  cache_control: { type: 'ephemeral' },  // Wrong position
},
{
  type: 'text',
  text: 'Additional text',
}

// ✅ Correct - cache_control at end
{
  type: 'text',
  text: DOCUMENT + '\n\nAdditional text',
  cache_control: { type: 'ephemeral' },  // Correct position
}

// ✅ Valid tool schema
{
  name: 'get_weather',
  description: 'Get current weather',
  input_schema: {
    type: 'object',           // Must be 'object'
    properties: {
      location: {
        type: 'string',       // Valid JSON Schema types
        description: 'City'   // Optional but recommended
      }
    },
    required: ['location']    // List required fields
  }
}

// ✅ Valid tool result
{
  type: 'tool_result',
  tool_use_id: block.id,      // Must match tool_use id
  content: JSON.stringify(result)  // Convert to string
}

const stream = await client.messages.stream({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Write a story.' }],
});

for await (const event of stream) {
  if (event.type === 'content_block_delta' && event.delta.type === 'text_delta') {
    process.stdout.write(event.delta.text);
  }
}

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  system: [
    {
      type: 'text',
      text: 'Long system prompt...',
      cache_control: { type: 'ephemeral' },
    },
  ],
  messages: [{ role: 'user', content: 'Question?' }],
});

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  tools: [{
    name: 'get_weather',
    description: 'Get weather for a location',
    input_schema: {
      type: 'object',
      properties: { location: { type: 'string' } },
      required: ['location'],
    },
  }],
  messages: [{ role: 'user', content: 'Weather in SF?' }],
});

if (message.stop_reason === 'tool_use') {
  const toolUse = message.content.find(b => b.type === 'tool_use');
  // Execute tool and send result back...
}

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  messages: [{
    role: 'user',
    content: [
      {
        type: 'image',
        source: {
          type: 'base64',
          media_type: 'image/jpeg',
          data: base64Image,
        },
      },
      { type: 'text', text: 'What is in this image?' },
    ],
  }],
});

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  thinking: {
    type: 'enabled',
    budget_tokens: 2000,
  },
  messages: [{ role: 'user', content: 'Solve complex problem...' }],
});

const thinking = message.content.find(b => b.type === 'thinking')?.thinking;
const answer = message.content.find(b => b.type === 'text')?.text;