// --- API endpoints (relies on window.api from common.js) ---
const ideasApi = {
  list: () => api.req("GET", "/api/ideas"),
  create: (title, description) =>
    api.req("POST", "/api/ideas", { title, description }),
  remove: (id) => api.req("DELETE", `/api/ideas/${id}`),
  setVisibility: (id, visibility) =>
    api.req("PUT", `/api/ideas/${id}/visibility`, { visibility }),
  enableShare: (id) => api.req("POST", `/api/ideas/${id}/share`),
  disableShare: (id) => api.req("DELETE", `/api/ideas/${id}/share`),
  notes: (id) => api.req("GET", `/api/ideas/${id}/notes`),
  addNote: (id, body) => api.req("POST", `/api/ideas/${id}/notes`, { body }),
  deleteNote: (id) => api.req("DELETE", `/api/notes/${id}`),
};

let me = null;
let ideas = [];
let selectedId = null;

// --- Auth bootstrap ---
async function init() {
  $("#idea-form").addEventListener("submit", onCreateIdea);
  try {
    me = await api.req("GET", "/api/me");
    showApp();
    await refresh();
  } catch (e) {
    if (e.status === 401) showLogin();
    else toast(e.message, true);
  }
}

async function showLogin() {
  $("#app-main").hidden = true;
  $("#login-gate").hidden = false;

  const params = new URLSearchParams(location.search);
  if (params.get("auth_error")) {
    const el = $("#login-error");
    el.hidden = false;
    el.textContent =
      params.get("auth_error") === "state"
        ? "Sign-in session expired or was tampered with. Please try again."
        : "Could not complete sign-in. Please try again.";
  }

  try {
    const { providers } = await api.req("GET", "/api/auth/providers");
    const box = $("#provider-buttons");
    if (!providers.length) {
      $("#login-note").hidden = false;
      return;
    }
    box.innerHTML = providers.map(providerButton).join("");
    box.querySelectorAll(".provider-btn").forEach((btn) => {
      btn.addEventListener("click", () => {
        location.href = `/auth/${btn.dataset.provider}`;
      });
    });
  } catch (e) {
    toast(e.message, true);
  }
}

function showApp() {
  $("#login-gate").hidden = true;
  $("#app-main").hidden = false;
  renderUserChip();
}

function renderUserChip() {
  const nav = $("#nav-right");
  // Remove any existing chip first.
  nav.querySelector(".user-chip")?.remove();
  const avatar = me.avatar_url
    ? `<img src="${escapeHtml(me.avatar_url)}" alt="" />`
    : `<span class="avatar-fallback">${escapeHtml(
        (me.name || "?")[0].toUpperCase()
      )}</span>`;
  const chip = document.createElement("div");
  chip.className = "user-chip";
  chip.innerHTML = `${avatar}<span>${escapeHtml(
    me.name
  )}</span><span class="logout" title="Sign out">⎋</span>`;
  chip.querySelector(".logout").addEventListener("click", () => {
    location.href = "/auth/logout";
  });
  nav.appendChild(chip);
}

// --- Rendering: idea list ---
function renderList() {
  const list = $("#ideas-list");
  $("#idea-count").textContent = ideas.length;

  if (!ideas.length) {
    list.innerHTML =
      '<div class="empty" style="padding:30px 10px">No ideas yet. Add your first one!</div>';
    return;
  }

  list.innerHTML = ideas
    .map(
      (idea) => `
      <div class="idea-item ${idea.id === selectedId ? "active" : ""}" data-id="${idea.id}">
        <h3>${escapeHtml(idea.title)}</h3>
        <div class="meta">
          <span class="pill">${idea.note_count} note${
        idea.note_count === 1 ? "" : "s"
      }</span>
          <span class="vis-badge ${idea.visibility}">${
        idea.visibility === "public" ? "🌐 public" : "🔒 private"
      }</span>
          <span>updated ${relativeTime(idea.updated_at)}</span>
        </div>
      </div>`
    )
    .join("");

  list
    .querySelectorAll(".idea-item")
    .forEach((el) =>
      el.addEventListener("click", () => selectIdea(Number(el.dataset.id)))
    );
}

// --- Rendering: detail + privacy + notes ---
function renderDetail() {
  const panel = $("#detail-panel");
  const idea = ideas.find((i) => i.id === selectedId);

  if (!idea) {
    panel.innerHTML =
      '<div class="empty"><span class="big">👈</span>Select an idea to see its notes, or create one to get started.</div>';
    return;
  }

  const shareUrl = idea.share_token
    ? `${location.origin}/share/${idea.share_token}`
    : "";

  panel.innerHTML = `
    <div class="detail-head">
      <h2>${escapeHtml(idea.title)}</h2>
      <button class="btn btn-danger btn-sm" id="del-idea">Delete idea</button>
    </div>
    ${
      idea.description
        ? `<p class="detail-desc">${escapeHtml(idea.description)}</p>`
        : ""
    }
    <div class="detail-meta">Created ${fullTime(idea.created_at)}</div>

    <div class="privacy-bar">
      <span class="vis-badge ${idea.visibility}">${
    idea.visibility === "public" ? "🌐 Public" : "🔒 Private"
  }</span>
      <label class="switch">
        <input type="checkbox" id="vis-toggle" ${
          idea.visibility === "public" ? "checked" : ""
        } />
        <span class="track"></span>
        <span>List on public Explore feed</span>
      </label>
    </div>

    <div class="share-box">
      <div class="share-head">
        <h4>🔗 Shareable read-only link</h4>
        ${
          idea.share_token
            ? `<button class="btn btn-danger btn-sm" id="share-disable">Disable</button>`
            : `<button class="btn btn-sm" id="share-enable">Create link</button>`
        }
      </div>
      ${
        idea.share_token
          ? `<div class="share-row">
               <input type="text" id="share-url" value="${escapeHtml(
                 shareUrl
               )}" readonly />
               <button class="btn btn-sm" id="share-copy">Copy</button>
             </div>
             <div class="share-hint">Anyone with this link can view the idea and its notes (read-only) — no account needed.</div>`
          : `<div class="share-hint">Generate a secret link to share this idea read-only, even while it stays private.</div>`
      }
    </div>

    <div class="divider"></div>
    <h2 style="font-size:1.05rem;margin-bottom:4px">Notes</h2>
    <div id="notes-container"><div class="empty" style="padding:20px">Loading…</div></div>
    <form class="note-composer" id="note-form">
      <textarea id="note-body" rows="2" placeholder="Add a note… (Cmd/Ctrl+Enter to post)" required></textarea>
      <div class="row"><button type="submit" class="btn btn-primary btn-sm">💬 Post note</button></div>
    </form>
  `;

  $("#del-idea").addEventListener("click", () => onDeleteIdea(idea.id));
  $("#vis-toggle").addEventListener("change", (e) =>
    onToggleVisibility(idea.id, e.target.checked)
  );

  $("#share-enable")?.addEventListener("click", () => onEnableShare(idea.id));
  $("#share-disable")?.addEventListener("click", () => onDisableShare(idea.id));
  $("#share-copy")?.addEventListener("click", async () => {
    await navigator.clipboard.writeText(shareUrl).catch(() => {});
    toast("Link copied to clipboard 🔗");
  });

  const form = $("#note-form");
  form.addEventListener("submit", (e) => {
    e.preventDefault();
    onAddNote(idea.id);
  });
  $("#note-body").addEventListener("keydown", (e) => {
    if ((e.metaKey || e.ctrlKey) && e.key === "Enter") {
      e.preventDefault();
      onAddNote(idea.id);
    }
  });

  loadNotes(idea.id);
}

// --- Actions ---
async function refresh() {
  try {
    ideas = await ideasApi.list();
    renderList();
    renderDetail();
  } catch (e) {
    toast(e.message, true);
  }
}
async function refreshListOnly() {
  ideas = await ideasApi.list();
  renderList();
}

function selectIdea(id) {
  selectedId = id;
  renderList();
  renderDetail();
}

async function loadNotes(id) {
  try {
    const notes = await ideasApi.notes(id);
    if (selectedId === id)
      renderNotesInto($("#notes-container"), notes, onDeleteNote);
  } catch (e) {
    toast(e.message, true);
  }
}

async function onCreateIdea(e) {
  e.preventDefault();
  const title = $("#idea-title").value.trim();
  const description = $("#idea-desc").value.trim();
  if (!title) return;
  try {
    const idea = await ideasApi.create(title, description);
    $("#idea-form").reset();
    await refresh();
    selectIdea(idea.id);
    toast("Idea added ✨");
  } catch (err) {
    toast(err.message, true);
  }
}

async function onDeleteIdea(id) {
  if (!confirm("Delete this idea and all its notes?")) return;
  try {
    await ideasApi.remove(id);
    if (selectedId === id) selectedId = null;
    await refresh();
    toast("Idea deleted");
  } catch (err) {
    toast(err.message, true);
  }
}

async function onToggleVisibility(id, makePublic) {
  try {
    const updated = await ideasApi.setVisibility(id, makePublic ? "public" : "private");
    mergeIdea(updated);
    renderList();
    renderDetail();
    toast(makePublic ? "Now public on Explore 🌐" : "Set to private 🔒");
  } catch (err) {
    toast(err.message, true);
    renderDetail();
  }
}

async function onEnableShare(id) {
  try {
    const updated = await ideasApi.enableShare(id);
    mergeIdea(updated);
    renderDetail();
    toast("Share link created 🔗");
  } catch (err) {
    toast(err.message, true);
  }
}

async function onDisableShare(id) {
  try {
    const updated = await ideasApi.disableShare(id);
    mergeIdea(updated);
    renderDetail();
    toast("Share link disabled");
  } catch (err) {
    toast(err.message, true);
  }
}

async function onAddNote(id) {
  const input = $("#note-body");
  const body = input.value.trim();
  if (!body) return;
  try {
    await ideasApi.addNote(id, body);
    input.value = "";
    await Promise.all([loadNotes(id), refreshListOnly()]);
  } catch (err) {
    toast(err.message, true);
  }
}

async function onDeleteNote(noteId) {
  try {
    await ideasApi.deleteNote(noteId);
    if (selectedId) await Promise.all([loadNotes(selectedId), refreshListOnly()]);
    toast("Note deleted");
  } catch (err) {
    toast(err.message, true);
  }
}

// Replace an idea in local state with a fresh copy (preserving note_count).
function mergeIdea(updated) {
  const idx = ideas.findIndex((i) => i.id === updated.id);
  if (idx !== -1) ideas[idx] = { ...ideas[idx], ...updated };
}

init();