const http = require("http");
const fs = require("fs");
const path = require("path");

const PORT = process.env.PORT || 3000;
const DATA_FILE = path.join(__dirname, "requests.json");
const RESPONSES_FILE = path.join(__dirname, "responses.json");

function readJson(file, def) {
  try { return JSON.parse(fs.readFileSync(file, "utf8")); } catch (_) { return def; }
}
function writeJson(file, data) {
  fs.writeFileSync(file, JSON.stringify(data, null, 2));
}

function body(req) {
  return new Promise((resolve) => {
    let s = "";
    req.on("data", (c) => (s += c));
    req.on("end", () => { try { resolve(JSON.parse(s || "{}")); } catch (_) { resolve({}); } });
  });
}

http.createServer(async (req, res) => {
  const url = req.url.split("?")[0];

  // API: получить все запросы и ответы
  if (req.method === "GET" && url === "/api/requests") {
    const requests = readJson(DATA_FILE, []);
    const responses = readJson(RESPONSES_FILE, []);
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ requests, responses }));
  }

  // API: добавить новый запрос
  if (req.method === "POST" && url === "/api/request") {
    const { query, preset } = await body(req);
    const requests = readJson(DATA_FILE, []);
    const newReq = {
      id: Date.now(),
      query,
      preset: preset || null,
      status: "pending",
      created: new Date().toISOString()
    };
    requests.unshift(newReq);
    writeJson(DATA_FILE, requests);
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ ok: true, request: newReq }));
  }

  // API: обновить ответ на запрос
  if (req.method === "POST" && url === "/api/response") {
    const { id, response, status } = await body(req);
    const responses = readJson(RESPONSES_FILE, []);
    const existing = responses.findIndex(r => r.id === id);
    const respData = { id, response, status: status || "completed", updated: new Date().toISOString() };
    if (existing >= 0) {
      responses[existing] = respData;
    } else {
      responses.unshift(respData);
    }
    writeJson(RESPONSES_FILE, responses);
    
    // Обновляем статус запроса
    const requests = readJson(DATA_FILE, []);
    const reqIdx = requests.findIndex(r => r.id === id);
    if (reqIdx >= 0) {
      requests[reqIdx].status = status || "completed";
      writeJson(DATA_FILE, requests);
    }
    
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ ok: true }));
  }

  // API: очистить старые данные
  if (req.method === "DELETE" && url === "/api/clear") {
    writeJson(DATA_FILE, []);
    writeJson(RESPONSES_FILE, []);
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ ok: true }));
  }

  // Статика
  let file = url === "/" ? "/index.html" : url;
  const full = path.join(__dirname, file);
  if (full.startsWith(__dirname) && fs.existsSync(full) && fs.statSync(full).isFile()) {
    const ext = path.extname(full);
    const type = ext === ".css" ? "text/css" : ext === ".js" ? "application/javascript" : "text/html";
    res.writeHead(200, { "Content-Type": type + "; charset=utf-8" });
    return res.end(fs.readFileSync(full));
  }

  res.writeHead(404);
  res.end("Not found");
}).listen(PORT, () => console.log("CRM Dashboard на порту " + PORT));