import { config as loadEnv } from "dotenv";

loadEnv();
loadEnv({ path: ".env.local", override: true });

function requireEnv(name: string, fallback?: string): string {
  const value = process.env[name] ?? fallback;
  if (!value) {
    throw new Error(`Missing environment variable: ${name}`);
  }
  return value;
}

export const env = {
  nodeEnv: process.env.NODE_ENV ?? "development",
  port: Number(process.env.PORT ?? 3000),
  qdrantUrl: requireEnv("QDRANT_URL", "http://localhost:6333"),
  qdrantApiKey: process.env.QDRANT_API_KEY ?? "",
  qdrantCollection: requireEnv("QDRANT_COLLECTION", "rag_chunks"),
  qdrantLogsCollection: requireEnv("QDRANT_LOGS_COLLECTION", "rag_eval_logs"),
  embeddingProvider: requireEnv("EMBEDDING_PROVIDER", "openrouter"),
  embeddingModel: requireEnv("EMBEDDING_MODEL", "qwen/qwen3-embedding-8b"),
  embeddingBaseUrl: requireEnv("EMBEDDING_BASE_URL", "https://openrouter.ai/api/v1"),
  embeddingApiKey: process.env.EMBEDDING_API_KEY ?? "",
  answerProvider: requireEnv("ANSWER_PROVIDER", "openrouter"),
  answerModel: requireEnv("ANSWER_MODEL", "openai/gpt-4.1-mini"),
  answerBaseUrl: requireEnv("ANSWER_BASE_URL", "https://openrouter.ai/api/v1"),
  answerApiKey: process.env.ANSWER_API_KEY ?? process.env.EMBEDDING_API_KEY ?? ""
} as const;