"use strict";

const api = {
  async get(url) {
    const r = await fetch(url, { credentials: "same-origin" });
    return r.json();
  },
  async post(url, formData) {
    const r = await fetch(url, {
      method: "POST",
      body: formData,
      credentials: "same-origin",
    });
    return { ok: r.ok, status: r.status, data: await r.json().catch(() => ({})) };
  },
};

// --- Headerbar (eingeloggt?) ---
let loggedIn = false;

async function refreshHeader() {
  const h = await api.get("/auth/headerbar");
  loggedIn = !!h.loggedin;

  const bar = document.getElementById("headerbar");
  document.getElementById("auth-box").hidden = loggedIn;
  document.getElementById("compose").hidden = !loggedIn;

  if (loggedIn) {
    bar.innerHTML = `<button id="logout-btn">Logout</button>`;
    document.getElementById("logout-btn").addEventListener("click", async () => {
      await api.get("/auth/logout");
      await refreshHeader();
    });
  } else {
    bar.innerHTML = "";
  }
}

// --- Login ---
document.getElementById("login-form").addEventListener("submit", async (e) => {
  e.preventDefault();
  const res = await api.post("/auth/login", new FormData(e.target));
  const msg = document.getElementById("auth-msg");
  if (res.ok) {
    msg.textContent = "";
    await refreshHeader();
  } else {
    msg.textContent = res.data.error || "Login fehlgeschlagen.";
  }
});

// --- Neuer Beitrag ---
document.getElementById("entry-form").addEventListener("submit", async (e) => {
  e.preventDefault();
  const res = await api.post("/entry/create", new FormData(e.target));
  const msg = document.getElementById("entry-msg");
  if (res.ok) {
    msg.textContent = "";
    e.target.reset();
    resetFeed();
  } else {
    msg.textContent = res.data.error || "Beitrag fehlgeschlagen.";
  }
});

// --- Feed mit Infinite Scroll ---
let page = 0;
let loading = false;
let done = false;

function renderEntry(e) {
  const el = document.createElement("article");
  el.className = "entry";

  const when = new Date(e.created_at * 1000).toLocaleString("de-DE");
  let media = "";
  if (e.filepath && e.filepath !== "none") {
    media = `<img src="/${e.filepath}" alt="" loading="lazy">`;
  }

  el.innerHTML = `
    <div class="meta"><strong>${escapeHtml(e.username)}</strong> · ${when}</div>
    <div class="content">${linkify(e.content)}</div>
    ${media}
    <div class="interactions">
      <button class="vote" data-mode="left">Links</button>
      <span class="counts">– / –</span>
      <button class="vote" data-mode="right">Rechts</button>
    </div>
  `;
  setupVoting(el, e.pid);
  return el;
}

function setupVoting(el, pid) {
  const box = el.querySelector(".interactions");
  const counts = box.querySelector(".counts");
  const buttons = box.querySelectorAll(".vote");

  function render(state) {
    if (state.error) {
      counts.textContent = state.error;
      return;
    }
    counts.textContent = `${state.left} / ${state.right}`;
    buttons.forEach((b) =>
      b.classList.toggle("selected", b.dataset.mode === state.selected)
    );
  }

  buttons.forEach((b) =>
    b.addEventListener("click", async () => {
      const fd = new FormData();
      fd.append("mode", b.dataset.mode);
      const res = await api.post(`/entry/${pid}/vote`, fd);
      render(res.data);
    })
  );

  // Anfangszustand laden (read-only).
  api.get(`/entry/${pid}/votes`).then(render);
}

async function loadMore() {
  if (loading || done) return;
  loading = true;

  const entries = await api.get(`/entry/feed/${page}`);
  const feed = document.getElementById("feed");

  if (!entries.length) {
    done = true;
    const end = document.createElement("p");
    end.className = "end";
    end.textContent = "YOU REACHED THE END!";
    feed.appendChild(end);
  } else {
    entries.forEach((e) => feed.appendChild(renderEntry(e)));
    page++;
  }
  loading = false;
}

function resetFeed() {
  page = 0;
  done = false;
  document.getElementById("feed").innerHTML = "";
  loadMore();
}

const observer = new IntersectionObserver((items) => {
  if (items.some((i) => i.isIntersecting)) loadMore();
});
observer.observe(document.getElementById("sentinel"));

// --- Helpers ---
function escapeHtml(s) {
  const d = document.createElement("div");
  d.textContent = s ?? "";
  return d.innerHTML;
}

function linkify(s) {
  const escaped = escapeHtml(s);
  const url = /https?:\/\/[^\s<]+/g;
  return escaped
    .replace(url, (m) => `<a href="${m}" target="_blank" rel="noopener">${m}</a>`)
    .replace(/\n/g, "<br>");
}

// --- Start ---
refreshHeader();
loadMore();