import express from "express";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const app = express();
app.use(express.json());
app.use(express.static(path.join(__dirname, "public")));

const stateFile = path.join(__dirname, "state.json");

// --------------------
// Konfiguration
// --------------------
const CONFIG = {
  A: {
    name: "Marc",
    color: 0x2ecc71, // grün
    icon: "a.png"
  },
  B: {
    name: "Laila",
    color: 0xe74c3c, // rot
    icon: "b.png"
  }
};

// Öffentliche URL zu deinem Server (WICHTIG für Discord Icons!)
const PUBLIC_BASE_URL = process.env.PUBLIC_BASE_URL
  || "http://localhost:3000";


// 🔔 Discord Webhook URL
const DISCORD_WEBHOOK_URL = process.env.DISCORD_WEBHOOK_URL
  || "https://discord.com/api/webhooks/1450872860607381515/zRbiXOykKPUfLJ_H87wD2OxQJPLdro6yQzU2T48Pg4fxSNaXEqBFgxdHGTiIDmmKGHIF";

  
// --------------------
// State Handling
// --------------------
function getState() {
  if (!fs.existsSync(stateFile)) {
    fs.writeFileSync(
      stateFile,
      JSON.stringify({ current: "A", lastReason: null }, null, 2)
    );
  }
  return JSON.parse(fs.readFileSync(stateFile, "utf-8"));
}

function setState(newState) {
  fs.writeFileSync(stateFile, JSON.stringify(newState, null, 2));
}

// --------------------
// Discord Webhook
// --------------------
async function sendDiscordEmbed(previousKey, currentKey, reason) {
  const previous = CONFIG[previousKey];
  const current = CONFIG[currentKey];

  if (!DISCORD_WEBHOOK_URL) return;

  const fields = [
    {
      name: "Von",
      value: previous.name,
      inline: true
    },
    {
      name: "Zu",
      value: current.name,
      inline: true
    }
  ];

  // Add reason field if provided
  if (reason) {
    fields.push({
      name: "📝 Grund",
      value: reason,
      inline: false
    });
  }

  const embed = {
    title: "💸 Zahl-Wechsel",
    description: `**${current.name}** ist jetzt dran zu zahlen`,
    color: current.color,
    thumbnail: {
      url: `${PUBLIC_BASE_URL}/img/${current.icon}`
    },
    fields: fields,
    footer: {
      text: new Date().toLocaleString("de-DE")
    }
  };

  try {
    await fetch(DISCORD_WEBHOOK_URL, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        embeds: [embed]
      })
    });
    console.log("✅ Discord Benachrichtigung gesendet");
  } catch (err) {
    console.error("❌ Discord Webhook Fehler:", err.message);
  }
}


// --------------------
// Routes
// --------------------

// GET: aktueller Zustand
app.get("/status", (req, res) => {
  res.json(getState());
});

// POST: wechseln
app.post("/toggle", async (req, res) => {
  const state = getState();
  const previousKey = state.current;
  const reason = req.body?.reason;

  state.current = state.current === "A" ? "B" : "A";
  state.lastReason = reason || null;
  setState(state);

  const logMessage = reason
    ? `Zahl-Wechsel: ${CONFIG[previousKey].name} → ${CONFIG[state.current].name} (Grund: ${reason})`
    : `Zahl-Wechsel: ${CONFIG[previousKey].name} → ${CONFIG[state.current].name}`;
  
  console.log(logMessage);

  await sendDiscordEmbed(previousKey, state.current, reason);

  res.json({
    current: state.current,
    name: CONFIG[state.current].name,
    lastReason: state.lastReason
  });
});

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

// --------------------
// Start
// --------------------
const PORT = process.env.PORT || 3000;
app.listen(PORT, () =>
  console.log(`WhoPays läuft auf http://localhost:${PORT}`)
);