import dotenv from "dotenv";
import fs from "node:fs";

dotenv.config();

function resolveDbSsl() {
  const caPath = process.env.DB_SSL_CA;
  const rejectUnauthorizedEnv = process.env.DB_SSL_REJECT_UNAUTHORIZED;
  if (!caPath && rejectUnauthorizedEnv === undefined) return undefined;
  return {
    rejectUnauthorized: rejectUnauthorizedEnv !== "false",
    ...(caPath ? { ca: fs.readFileSync(caPath, "utf8") } : {})
  };
}

export const config = {
  port: Number(process.env.PORT ?? 3001),
  corsOrigin: process.env.CORS_ORIGIN ?? "http://localhost:5173",
  apiKey: process.env.API_KEY ?? "",
  auth: {
    mode: process.env.AUTH_MODE ?? "none"
  },
  db: {
    host: process.env.DB_HOST,
    user: process.env.DB_USER,
    port: process.env.DB_PORT ? Number(process.env.DB_PORT) : undefined,
    password: process.env.DB_PASS,
    schema: process.env.DB_SCHEMA,
    charset: "utf8mb4",
    ssl: resolveDbSsl()
  },
  jwt: {
    secret: process.env.JWT_SECRET ?? "",
    issuer: process.env.JWT_ISSUER ?? "oraculo-api",
    accessTtlSeconds: Number(process.env.JWT_ACCESS_TTL_SECONDS ?? 900),
    refreshTtlSeconds: Number(process.env.JWT_REFRESH_TTL_SECONDS ?? 60 * 60 * 24 * 30),
    refreshTtlShortSeconds: Number(process.env.JWT_REFRESH_TTL_SHORT_SECONDS ?? 60 * 60 * 24)
  },
  qdrant: {
    url: process.env.QDRANT_URL ?? "http://localhost:6333",
    apiKey: process.env.QDRANT_API_KEY ?? "",
    collection: process.env.QDRANT_COLLECTION ?? "oraculo_docs"
  },
  ollama: {
    url: process.env.OLLAMA_URL ?? "http://localhost:11434",
    embeddingsModel: process.env.OLLAMA_EMBEDDINGS_MODEL ?? "nomic-embed-text",
    embedQueryPrefix: process.env.OLLAMA_EMBED_QUERY_PREFIX ?? "",
    embedPassagePrefix: process.env.OLLAMA_EMBED_PASSAGE_PREFIX ?? "",
    chatModel: process.env.OLLAMA_CHAT_MODEL ?? "llama3.1",
    visionModel: process.env.OLLAMA_VISION_MODEL ?? "llava:latest",
    timeoutMs: Number(process.env.OLLAMA_TIMEOUT_MS ?? 180_000)
  },
  rag: {
    topK: Number(process.env.RAG_TOP_K ?? 8),
    minScore: Number(process.env.RAG_MIN_SCORE ?? 0.40),
    chunkSize: Number(process.env.RAG_CHUNK_SIZE ?? 900),
    chunkOverlap: Number(process.env.RAG_CHUNK_OVERLAP ?? 150),
    queryRewrite: process.env.RAG_QUERY_REWRITE === "true",
    historyLimit: Number(process.env.RAG_HISTORY_LIMIT ?? 6),
    rerank: process.env.RAG_RERANK === "true",
    rerankTopN: Number(process.env.RAG_RERANK_TOP_N ?? process.env.RAG_TOP_K ?? 8),
    hyde: process.env.RAG_HYDE === "true"
  },
  llm: {
    temperature: Number(process.env.LLM_TEMPERATURE ?? 0.2),
    topP: Number(process.env.LLM_TOP_P ?? 0.9),
    numPredict: Number(process.env.LLM_NUM_PREDICT ?? 4096),
    repeatPenalty: Number(process.env.LLM_REPEAT_PENALTY ?? 1.1),
    numCtx: Number(process.env.LLM_NUM_CTX ?? 32768)
  },
  rateLimit: {
    perMinute: Number(process.env.RATE_LIMIT_PER_MINUTE ?? 0)
  },
  ifbot: {
    baseUrl: process.env.IFBOT_BASE_URL ?? "https://star.ifbot.com.br/api",
    // arquivos de mídia (/data/img, /data/aud) são servidos na raiz do domínio, fora do /api
    mediaBaseUrl: (process.env.IFBOT_MEDIA_BASE_URL ?? (process.env.IFBOT_BASE_URL ?? "https://star.ifbot.com.br/api").replace(/\/api\/?$/, "")).replace(/\/+$/, ""),
    token: process.env.IFBOT_TOKEN ?? "",
    authHeader: process.env.IFBOT_AUTH_HEADER ?? "Authorization",
    syncIntervalMinutes: Number(process.env.ATENDIMENTOS_SYNC_INTERVAL_MINUTES ?? 30)
  },
  avaliacao: {
    // modelo usado como juiz; vazio usa o chatModel do Ollama
    model: process.env.OLLAMA_JUDGE_MODEL ?? "",
    intervalMinutes: Number(process.env.ATENDIMENTOS_AVALIACAO_INTERVAL_MINUTES ?? 60),
    batchSize: Number(process.env.ATENDIMENTOS_AVALIACAO_BATCH ?? 10),
    maxChars: Number(process.env.ATENDIMENTOS_AVALIACAO_MAX_CHARS ?? 12000)
  }
};

function validateConfig(cfg) {
  const dbRequired = { host: "DB_HOST", user: "DB_USER", password: "DB_PASS", schema: "DB_SCHEMA" };
  for (const [key, envName] of Object.entries(dbRequired)) {
    if (!cfg.db[key]) throw new Error(`[config] ${envName} é obrigatório`);
  }
  if (cfg.auth.mode === "jwt" && !cfg.jwt.secret) {
    throw new Error("[config] JWT_SECRET não pode ser vazio quando AUTH_MODE=jwt");
  }
  if (cfg.rateLimit.perMinute === 0) {
    console.warn("[config] RATE_LIMIT_PER_MINUTE=0 — rate limiting desabilitado");
  }
}

validateConfig(config);