const express = require("express");
const fetch = require("node-fetch");
const path = require("path");

const app = express();

const PORT = process.env.PORT || 7860;
const TARGET = process.env.TARGET_API_URL;

if (!TARGET) {
  console.error("❌ 必须设置环境变量 TARGET_API_URL");
  process.exit(1);
}

// 前端静态目录
app.use(express.static(path.join(__dirname, "public")));

// 代理接口
app.get("/api/data", async (req, res) => {
  try {
    const r = await fetch(TARGET, {
      headers: {
        "pragma": "no-cache"
      }
    });

    const text = await r.text();

    // 允许跨域
    res.set("Access-Control-Allow-Origin", "*");
    res.set("Content-Type", "application/json");

    res.send(text);
  } catch (e) {
    res.status(500).json({ error: e.toString() });
  }
});

app.listen(PORT, () => {
  console.log("✅ Server running on port", PORT);
});