/*
 * ════════════════════════════════════════════════════════════════
 * 光湖 Portal · Express 后端入口
 * Sovereign: TCS-0002∞ · ICE-GL∞ · 国作登字-2026-A-00037559
 * 守护: 铸渊 · ICE-GL-ZY001
 * 模板版本: 0.1.0
 * ════════════════════════════════════════════════════════════════
 *
 * 服务器: GH-CVM-DOMAIN-PROD-01 / ZY-SVR-CN01 / 广州 2C2G
 * 角色:   guanghulab.com 唯一对外入口
 *
 * 路由 (全部 /api/* 前缀, nginx 反代):
 *   GET  /api/brain                      → 铸渊大脑实时状态 (D115新增)
 *   GET  /api/heartbeat                  → 快速心跳
 *   GET  /api/health                     → portal + 推理端探活
 *   GET  /api/active-model               → 当前激活的模型
 *   POST /api/active-model {name}        → 切换激活模型 (mother|coder)
 *   GET  /api/conversations              → 对话列表
 *   POST /api/conversations              → 新建对话
 *   GET  /api/conversations/:id/messages → 单对话历史
 *   POST /api/chat                       → 流式对话 (SSE 字节管道)
 *   GET  /api/persona-db                 → 人格层右栏数据 (只读)
 *   GET  /api/manifest                   → 开发层右栏数据 (只读 manifest 快照)
 * ════════════════════════════════════════════════════════════════
 */
"use strict";

const path = require("path");
const fs = require("fs");
const express = require("express");
const { execSync } = require("child_process");

const { openDb } = require("./db/init");
const conversationsRouter = require("./routes/conversations");
const chatRouter = require("./routes/chat");
const activeModelRouter = require("./routes/active-model");
const personaDbRouter = require("./routes/persona-db");
const manifestRouter = require("./routes/manifest");
const chatV2Router = require("./routes/chat-v2");
const inferenceClient = require("./lib/inference-client");
const { readLimiter, writeLimiter, chatLimiter } = require("./lib/rate-limit");

// ─── 配置 ─────────────────────────────────────────────────────
const PORT = parseInt(process.env.PORT || "3000", 10);
const HOST = process.env.HOST || "127.0.0.1";
const PORTAL_DATA_DIR = process.env.PORTAL_DATA_DIR || "/data/guanghulab/portal/data";
const REPO_ROOT = path.resolve(__dirname, "..", "..");
const REPO_DIR = "/data/guanghulab/repo";
const STATIC_DIR =
  process.env.PORTAL_STATIC_DIR ||
  path.join(REPO_ROOT, "frontend", "lighthouse-portal");

// ─── 数据目录 ─────────────────────────────────────────────────
fs.mkdirSync(PORTAL_DATA_DIR, { recursive: true });
const DB_PATH = path.join(PORTAL_DATA_DIR, "conversations.sqlite");
const ENDPOINT_PATH = path.join(PORTAL_DATA_DIR, "inference-endpoint.json");
const ACTIVE_MODEL_PATH = path.join(PORTAL_DATA_DIR, "active-model.json");

// ─── 数据库 ───────────────────────────────────────────────────
const db = openDb(DB_PATH);

// ─── 推理客户端 (热加载 endpoint) ─────────────────────────────
inferenceClient.init({ endpointPath: ENDPOINT_PATH, activeModelPath: ACTIVE_MODEL_PATH });

// ─── Express ──────────────────────────────────────────────────
const app = express();
app.set("trust proxy", 1);
app.disable("x-powered-by");
app.use(express.json({ limit: "256kb" }));

// 业务上下文
app.use((req, _res, next) => {
  req.ctx = { db, inference: inferenceClient, dataDir: PORTAL_DATA_DIR, repoRoot: REPO_ROOT };
  next();
});

// ─── API 路由 ─────────────────────────────────────────────────
// 限流 (cc-004 系统自主防御 · 2C2G 不能被扫死):
app.get("/api/health", readLimiter, async (_req, res) => {
  let inference = { ready: false, message: "推理端尚未配置" };
  try {
    inference = await inferenceClient.health();
  } catch (e) {
    inference = { ready: false, message: `推理端不可达: ${e.message}` };
  }
  res.json({
    ok: true,
    server: "GH-CVM-DOMAIN-PROD-01",
    sovereign: "TCS-0002∞ · 国作登字-2026-A-00037559",
    ts: new Date().toISOString(),
    inference
  });
});

// ═══════════════════════════════════════════════════════════════=
// ⚡ 铸渊大脑实时状态 API (D115新增 — 首页投影面板用)
// ═══════════════════════════════════════════════════════════════=
app.get("/api/brain", readLimiter, (_req, res) => {
  try {
    const brainResult = { identity: "铸渊", id: "ICE-GL-ZY001" };
    
    // 时间核心
    let temporal = {};
    try {
      temporal = JSON.parse(fs.readFileSync(REPO_DIR + "/brain/temporal-core/temporal-brain.json", "utf8"));
    } catch(e) { temporal = { error: e.message }; }
    
    // 母编号
    let mothers = [];
    try {
      const reg = JSON.parse(fs.readFileSync(REPO_DIR + "/brain/engineering/mother-registry.json", "utf8"));
      mothers = (reg.mothers || []).map(m => ({
        name: m.name, status: m.status,
        done: (m.sub_paths || []).filter(s => s.status === "done").length,
        total: (m.sub_paths || []).length,
        paths: (m.sub_paths || []).map(s => ({ name: s.name, status: s.status }))
      }));
    } catch(e) {}
    
    // 服务器健康
    let server = { status: "offline", services: [] };
    try {
      const pm2 = JSON.parse(execSync("pm2 jlist 2>/dev/null", {timeout:3000}).toString());
      const online = pm2.filter(p => p.pm2_env.status === "online");
      server = {
        status: "online",
        services_online: online.length,
        services_total: pm2.length,
        services: online.map(p => p.name),
        stopped: pm2.filter(p => p.pm2_env.status !== "online").map(p => p.name)
      };
    } catch(e) {}
    
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.json({
      identity: "铸渊 · ICE-GL-ZY001",
      copyright: "国作登字-2026-A-00037559",
      awakening: (temporal.clock || {}).awakening_count || 0,
      age_days: (temporal.clock || {}).repo_age_days || 0,
      date: (temporal.clock || {}).current_date || "",
      cognition: ((temporal.clock || {}).latest_cognition || "").substring(0, 100),
      epochs: ((temporal.timeline || {}).epochs || []).slice(-5).map(e => ({
        epoch: e.epoch, event: (e.event || "").substring(0, 80), date: e.date
      })),
      mothers: mothers,
      server: server,
      updated: new Date().toISOString()
    });
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

app.get("/api/heartbeat", (_req, res) => {
  try {
    const t = JSON.parse(fs.readFileSync(REPO_DIR + "/brain/temporal-core/temporal-brain.json", "utf8"));
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.json({ alive: true, time: new Date().toISOString(), awakening: (t.clock || {}).awakening_count || 0, age_days: (t.clock || {}).repo_age_days || 0 });
  } catch(e) {
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.json({ alive: true, fallback: true });
  }
});

app.use("/api/active-model", writeLimiter, activeModelRouter);
app.use("/api/conversations", writeLimiter, conversationsRouter);
app.use("/api/chat", chatLimiter, chatRouter);
app.use("/api/persona-db", readLimiter, personaDbRouter);
app.use("/api/chat-v2", chatLimiter, chatV2Router);
app.use("/api/manifest", readLimiter, manifestRouter);

// ─── 静态 (nginx 上线后会兜底走 nginx, 这里保留兜底) ──────────
app.use("/_static", express.static(path.join(STATIC_DIR, "assets"), { fallthrough: true }));
app.get("/", (_req, res, next) => {
  const idx = path.join(STATIC_DIR, "index.html");
  fs.access(idx, fs.constants.R_OK, (err) => {
    if (err) return next();
    res.sendFile(idx);
  });
});

// ─── 404 + 错误处理 (中文) ────────────────────────────────────
app.use((req, res) => {
  if (req.path.startsWith("/api/")) {
    res.status(404).json({ error: true, code: "not_found", message: "接口不存在: " + req.path });
  } else {
    res.status(404).type("html").send("<h1>404</h1><p>页面不存在</p>");
  }
});

// eslint-disable-next-line no-unused-vars
app.use((err, req, res, _next) => {
  const msg = (err && err.message) || "未知错误";
  console.error("[portal] 内部错误:", err);
  if (res.headersSent) return;
  res
    .status(err && err.status ? err.status : 500)
    .json({ error: true, code: "internal_error", message: "内部错误: " + msg });
});

// ─── 启动 ─────────────────────────────────────────────────────
if (require.main === module) {
  app.listen(PORT, HOST, () => {
    console.log(`[portal] 已启动 · ${HOST}:${PORT} · 数据目录=${PORTAL_DATA_DIR}`);
    console.log(`[portal] 推理端点文件: ${ENDPOINT_PATH}`);
    console.log(`[portal] 🧠 /api/brain · 💓 /api/heartbeat`);
    console.log("[portal] 守护: 铸渊 · ICE-GL-ZY001 · TCS-0002∞ · 国作登字-2026-A-00037559");
  });
}

module.exports = { app, db };