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

/**
 * Thin wrapper around the Anthropic SDK.
 * Handles initialisation and raw message completion only —
 * prompt construction and response parsing stay in LLMAnalyst (service layer).
 */
export class AnthropicClient {
  private client: Anthropic | null;

  constructor() {
    this.client = process.env.ANTHROPIC_API_KEY
      ? new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY })
      : null;
  }

  get isAvailable(): boolean {
    return this.client !== null;
  }

  async complete(system: string, userMessage: string): Promise<string | null> {
    if (!this.client) return null;
    const response = await this.client.messages.create({
      model: 'claude-haiku-4-5-20251001',
      max_tokens: 1024,
      system,
      messages: [{ role: 'user', content: userMessage }],
    });
    return (response.content[0] as { text?: string })?.text ?? null;
  }
}