Jev integrations for TypeSafe, OpenRouter, and Vercel

// lib/jev-adapter.ts
export type JevProvider = 'typesafe' | 'openrouter' | 'vercel';

interface EvaluatePayload {
  state: string;
  questions: Record<string, unknown>;
  provider?: JevProvider;
}

export async function evaluateJevDecision(payload: EvaluatePayload) {
  const provider = payload.provider || (process.env.JEV_PROVIDER as JevProvider) || 'typesafe';
  
  const config = {
    typesafe: {
      url: 'https://api.typesafe.ai/v1/evaluate',
      key: process.env.TYPESAFE_API_KEY,
      model: 'jev-1',
    },
    openrouter: {
      url: 'https://openrouter.ai/api/v1/chat/completions',
      key: process.env.OPENROUTER_API_KEY,
      model: 'typesafe/jev-1',
    },
    vercel: {
      url: process.env.VERCEL_AI_GATEWAY_URL || '',
      key: process.env.VERCEL_AI_GATEWAY_KEY,
      model: 'jev-1',
    },
  }[provider];

  const res = await fetch(config.url, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${config.key}`,
    },
    body: JSON.stringify({
      model: config.model,
      state: payload.state,
      questions: payload.questions,
    }),
  });

  if (!res.ok) {
    throw new Error(`Jev evaluate failed via ${provider}: ${res.statusText}`);
  }

  return res.json();
}