const express = require("express");
const axios = require("axios");
const fs = require("fs");
const path = require("path");

const app = express();
const PORT = process.env.PORT || 7860;
const startTime = Date.now();

// Load uptime targets
const configPath = path.join(__dirname, "up.json");
const config = JSON.parse(fs.readFileSync(configPath, "utf8"));

let stats = {};

// Init stats
config.targets.forEach(t => {
  stats[t.name] = {
    url: t.url,
    success: 0,
    fail: 0,
    lastPing: null,
    lastStatus: "pending"
  };
});

// Serve static HTML
app.use(express.static(path.join(__dirname, "public")));

// 🔁 UPTIME PINGER
async function pingTargets() {
  for (const target of config.targets) {
    try {
      await axios.get(target.url, { timeout: 8000 });
      stats[target.name].success++;
      stats[target.name].lastStatus = "online";
    } catch (err) {
      stats[target.name].fail++;
      stats[target.name].lastStatus = "offline";
    }
    stats[target.name].lastPing = new Date().toLocaleString();
  }
}

// Run pinger
setInterval(pingTargets, config.interval_seconds * 1000);
pingTargets();

// 🧠 STATUS API
app.get("/status", (req, res) => {
  const uptimeSeconds = Math.floor((Date.now() - startTime) / 1000);
  res.json({
    status: "running",
    uptimeSeconds,
    serverTime: new Date().toLocaleString(),
    targets: stats
  });
});

// Root
app.get("/", (req, res) => {
  res.sendFile(path.join(__dirname, "public", "index.html"));
});

// Start server
app.listen(PORT, () => {
  console.log(`🚀 Uptime Monitor running on http://localhost:${PORT}`);
});