app-github.js

const firebaseConfig = {
  apiKey: "AIzaSyBdcqSSWmjGnn3fsi8eDQTXtFDFUiYbtfU",
  authDomain: "devtrackr-149be.firebaseapp.com",
  projectId: "devtrackr-149be",
  storageBucket: "devtrackr-149be.firebasestorage.app",
  messagingSenderId: "936962359530",
  appId: "1:936962359530:web:0a27728821a2a02ea91793",
  measurementId: "G-VX3H0BDW39",
};

firebase.initializeApp(firebaseConfig);

const auth = firebase.auth();
const db = firebase.firestore();

const btnLogout = document.getElementById("btn-logout");
btnLogout.onclick = () => {
  auth.signOut().then(() => {
    window.location.href = "index.html";
  });
};

auth.onAuthStateChanged((user) => {
  if (!user) {
    window.location.href = "index.html";
  }
});

const githubUsernameInput = document.getElementById("github-username");
const btnSaveGithub = document.getElementById("btn-save-github");
const btnLoadGithub = document.getElementById("btn-load-github");
const githubReposList = document.getElementById("github-repos");

btnSaveGithub.onclick = async () => {
  const user = auth.currentUser;
  if (!user) return;
  const username = githubUsernameInput.value.trim();
  if (!username) return alert("Enter username");
  await db.collection("users").doc(user.uid).set(
    {
      githubUsername: username,
    },
    { merge: true }
  );
  alert("GitHub username saved");
};

async function loadGithubUsername() {
  const user = auth.currentUser;
  if (!user) return;
  const docSnap = await db.collection("users").doc(user.uid).get();
  if (docSnap.exists && docSnap.data().githubUsername) {
    githubUsernameInput.value = docSnap.data().githubUsername;
  }
}

btnLoadGithub.onclick = async () => {
  const username = githubUsernameInput.value.trim();
  if (!username) return alert("Enter username");

  githubReposList.innerHTML = "Loading...";
  const res = await fetch(`https://api.github.com/users/${username}/repos`);
  const repos = await res.json();

  githubReposList.innerHTML = "";
  
  // Check if user exists (GitHub API returns error object for 404)
  if (repos.message) {
    const li = document.createElement("li");
    li.textContent = "User not found";
    li.style.color = "#f87171";
    li.style.fontWeight = "600";
    githubReposList.appendChild(li);
    return;
  }

  if (!repos.length) {
    const li = document.createElement("li");
    li.textContent = "User exists but has no public repositories";
    li.style.color = "#9ca3af";
    li.style.fontStyle = "italic";
    githubReposList.appendChild(li);
    return;
  }

  (repos || []).slice(0, 6).forEach((r) => {
    const last = r.pushed_at
      ? new Date(r.pushed_at).toDateString()
      : "N/A";
    const li = document.createElement("li");
    li.textContent = `${r.name} — Last commit: ${last}`;
    githubReposList.appendChild(li);
  });
};

// Load username on page load
auth.onAuthStateChanged((user) => {
  if (user) {
    loadGithubUsername();
  }
});