'use strict';

// ── Theme ─────────────────────────────────────────────────────────────────────

const savedTheme = localStorage.getItem('bagg_theme');
if (savedTheme) document.documentElement.setAttribute('data-theme', savedTheme);

function isDark() {
  const t = document.documentElement.getAttribute('data-theme');
  if (t === 'dark') return true;
  if (t === 'light') return false;
  return window.matchMedia('(prefers-color-scheme: dark)').matches;
}

function applyThemeIcons() {
  const dark = isDark();
  document.getElementById('icon-sun').style.display  = dark ? 'block' : 'none';
  document.getElementById('icon-moon').style.display = dark ? 'none'  : 'block';
}

document.getElementById('btn-theme').addEventListener('click', () => {
  const next = isDark() ? 'light' : 'dark';
  document.documentElement.setAttribute('data-theme', next);
  localStorage.setItem('bagg_theme', next);
  applyThemeIcons();
});

applyThemeIcons();

// ── Offline detection ─────────────────────────────────────────────────────────

const offlineBanner = document.getElementById('offline-banner');
function updateOnlineStatus() {
  offlineBanner.classList.toggle('show', !navigator.onLine);
}
window.addEventListener('online',  updateOnlineStatus);
window.addEventListener('offline', updateOnlineStatus);
updateOnlineStatus();

// ── Toast ─────────────────────────────────────────────────────────────────────

function showToast(msg, duration = 2500) {
  const el = document.createElement('div');
  el.className = 'toast';
  el.textContent = msg;
  document.getElementById('toasts').appendChild(el);
  setTimeout(() => el.remove(), duration);
}

// ── State ─────────────────────────────────────────────────────────────────────

const state = {
  filter: 'all',   // all | unread | starred | archived
  page: 1,
  pages: 1,
  total: 0,
  entries: [],
  loading: false,
};

// ── Logout ────────────────────────────────────────────────────────────────────

document.getElementById('btn-logout').addEventListener('click', async () => {
  await fetch('/web/logout', { method: 'POST' });
  location.href = '/login.html';
});

// ── Tab switching ─────────────────────────────────────────────────────────────

document.querySelectorAll('.tab-btn').forEach(btn => {
  btn.addEventListener('click', () => {
    document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
    btn.classList.add('active');
    state.filter = btn.dataset.filter;
    state.page = 1;
    loadEntries();
  });
});

// ── API helpers ───────────────────────────────────────────────────────────────

async function apiFetch(path, opts = {}) {
  const r = await fetch(path, {
    headers: { 'Content-Type': 'application/json', ...(opts.headers || {}) },
    ...opts,
  });
  if (r.status === 204) return null;
  const data = await r.json();
  if (!r.ok) throw new Error(data.error || `HTTP ${r.status}`);
  return data;
}

// ── Load entries ──────────────────────────────────────────────────────────────

async function loadEntries() {
  if (state.loading) return;
  state.loading = true;
  renderEntries();

  const params = new URLSearchParams({ page: state.page, perPage: 50 });
  if (state.filter === 'unread')   { params.set('archive', '0'); }
  if (state.filter === 'archived') { params.set('archive', '1'); }
  if (state.filter === 'starred')  { params.set('starred', '1'); }

  try {
    const data = await apiFetch(`/web/api/entries?${params}`);
    state.entries = data.items;
    state.page    = data.page;
    state.pages   = data.pages;
    state.total   = data.total;
  } catch (e) {
    showToast('Failed to load entries');
  }

  state.loading = false;
  renderEntries();
}

// ── Render ────────────────────────────────────────────────────────────────────

function timeAgo(isoStr) {
  const secs = Math.floor((Date.now() - new Date(isoStr)) / 1000);
  if (secs < 60)    return 'just now';
  if (secs < 3600)  return `${Math.floor(secs / 60)}m ago`;
  if (secs < 86400) return `${Math.floor(secs / 3600)}h ago`;
  if (secs < 86400 * 30) return `${Math.floor(secs / 86400)}d ago`;
  return new Date(isoStr).toLocaleDateString(undefined, { month: 'short', day: 'numeric', year: 'numeric' });
}

function faviconUrl(domain) {
  if (!domain) return null;
  return `https://www.google.com/s2/favicons?sz=32&domain=${encodeURIComponent(domain)}`;
}

function entryHTML(e) {
  const domain = e.domain_name || '';
  const title  = e.title || e.url;
  const fav    = faviconUrl(domain);
  const favHTML = fav
    ? `<img src="${fav}" alt="" loading="lazy" onerror="this.style.display='none'">`
    : domain.slice(0, 2).toUpperCase();

  return `
  <div class="entry-card ${e.is_archived ? 'archived' : ''}" data-id="${e.id}">
    <div class="entry-favicon">${favHTML}</div>
    <div class="entry-body">
      <div class="entry-title"
           title="${escHtml(title)}"
           onclick="window.open('${escHtml(e.url)}','_blank','noopener')"
           style="cursor:pointer"
      >${escHtml(title)}</div>
      <div class="entry-meta">
        ${domain ? `<span class="entry-domain">${escHtml(domain)}</span>` : ''}
        <span>${timeAgo(e.created_at)}</span>
        ${e.reading_time > 0 ? `<span>${e.reading_time} min</span>` : ''}
      </div>
    </div>
    <div class="entry-actions">
      <button class="action-btn ${e.is_starred ? 'active-star' : ''}"
              data-action="star" data-id="${e.id}"
              title="${e.is_starred ? 'Unstar' : 'Star'}"
              aria-label="${e.is_starred ? 'Unstar' : 'Star'}">
        <svg width="15" height="15" fill="${e.is_starred ? 'currentColor' : 'none'}" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
          <polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2"/>
        </svg>
      </button>
      <button class="action-btn ${e.is_archived ? 'active-archive' : ''}"
              data-action="archive" data-id="${e.id}"
              title="${e.is_archived ? 'Unarchive' : 'Archive'}"
              aria-label="${e.is_archived ? 'Unarchive' : 'Archive'}">
        <svg width="15" height="15" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
          <polyline points="21 8 21 21 3 21 3 8"/><rect x="1" y="3" width="22" height="5"/><line x1="10" y1="12" x2="14" y2="12"/>
        </svg>
      </button>
      <button class="action-btn danger"
              data-action="delete" data-id="${e.id}"
              title="Delete" aria-label="Delete">
        <svg width="15" height="15" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
          <polyline points="3 6 5 6 21 6"/><path d="M19 6l-1 14H6L5 6"/><path d="M10 11v6"/><path d="M14 11v6"/><path d="M9 6V4h6v2"/>
        </svg>
      </button>
    </div>
  </div>`;
}

function renderEntries() {
  const container = document.getElementById('entries-container');

  if (state.loading) {
    container.innerHTML = `<div class="loading"><div class="spinner"></div><p>Loading…</p></div>`;
    return;
  }

  if (state.entries.length === 0) {
    const msgs = {
      all:      ['No links saved yet.', 'Tap + to save your first link.'],
      unread:   ['Nothing to read.',    'Links you haven\'t archived appear here.'],
      starred:  ['No starred links.',   'Star important links to find them quickly.'],
      archived: ['Nothing archived.',   'Archived links live here.'],
    };
    const [title, sub] = msgs[state.filter] || msgs.all;
    container.innerHTML = `
      <div class="empty-state">
        <svg width="48" height="48" fill="none" stroke="currentColor" stroke-width="1.5" viewBox="0 0 24 24">
          <path d="M19 21l-7-5-7 5V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2z"/>
        </svg>
        <p>${title}</p>
        <small>${sub}</small>
      </div>`;
    return;
  }

  let html = '<div class="entries-list">' + state.entries.map(entryHTML).join('') + '</div>';

  if (state.pages > 1) {
    html += `
      <div class="pagination">
        <button class="page-btn" id="btn-prev" ${state.page <= 1 ? 'disabled' : ''}>Prev</button>
        <span class="page-info">${state.page} / ${state.pages}</span>
        <button class="page-btn" id="btn-next" ${state.page >= state.pages ? 'disabled' : ''}>Next</button>
      </div>`;
  }

  container.innerHTML = html;

  // Pagination
  container.querySelector('#btn-prev')?.addEventListener('click', () => { state.page--; loadEntries(); });
  container.querySelector('#btn-next')?.addEventListener('click', () => { state.page++; loadEntries(); });

  // Entry actions (event delegation)
  container.addEventListener('click', handleEntryAction);
}

function escHtml(str) {
  return String(str)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}

// ── Entry actions ─────────────────────────────────────────────────────────────

async function handleEntryAction(e) {
  const btn = e.target.closest('[data-action]');
  if (!btn) return;

  const id     = +btn.dataset.id;
  const action = btn.dataset.action;
  const entry  = state.entries.find(en => en.id === id);
  if (!entry) return;

  if (action === 'star') {
    try {
      const updated = await apiFetch(`/web/api/entries/${id}`, {
        method: 'PATCH',
        body: JSON.stringify({ is_starred: entry.is_starred ? 0 : 1 }),
      });
      Object.assign(entry, updated);
      renderEntries();
    } catch { showToast('Failed to update'); }
  }

  if (action === 'archive') {
    try {
      const updated = await apiFetch(`/web/api/entries/${id}`, {
        method: 'PATCH',
        body: JSON.stringify({ is_archived: entry.is_archived ? 0 : 1 }),
      });
      Object.assign(entry, updated);
      // Remove from current view if filter doesn't match
      if (state.filter === 'unread'   &&  updated.is_archived) state.entries = state.entries.filter(en => en.id !== id);
      if (state.filter === 'archived' && !updated.is_archived) state.entries = state.entries.filter(en => en.id !== id);
      renderEntries();
      showToast(updated.is_archived ? 'Archived' : 'Moved to unread');
    } catch { showToast('Failed to update'); }
  }

  if (action === 'delete') {
    if (!confirm('Delete this link?')) return;
    try {
      await apiFetch(`/web/api/entries/${id}`, { method: 'DELETE' });
      state.entries = state.entries.filter(en => en.id !== id);
      renderEntries();
      showToast('Deleted');
    } catch { showToast('Failed to delete'); }
  }
}

// ── Add link modal ────────────────────────────────────────────────────────────

const modalAdd    = document.getElementById('modal-add');
const inputUrl    = document.getElementById('input-url');
const inputTitle  = document.getElementById('input-title');

document.getElementById('btn-add').addEventListener('click', () => {
  modalAdd.classList.add('open');
  inputUrl.value   = '';
  inputTitle.value = '';
  setTimeout(() => inputUrl.focus(), 50);
});

document.getElementById('btn-modal-cancel').addEventListener('click', closeModal);

modalAdd.addEventListener('click', e => {
  if (e.target === modalAdd) closeModal();
});

document.addEventListener('keydown', e => {
  if (e.key === 'Escape') closeModal();
});

function closeModal() {
  modalAdd.classList.remove('open');
}

document.getElementById('btn-modal-save').addEventListener('click', saveLink);

inputUrl.addEventListener('keydown', e => { if (e.key === 'Enter') saveLink(); });

async function saveLink() {
  const url   = inputUrl.value.trim();
  const title = inputTitle.value.trim();
  if (!url) { inputUrl.focus(); return; }

  // Basic URL sanity
  try { new URL(url); } catch {
    showToast('Invalid URL');
    inputUrl.focus();
    return;
  }

  const btn = document.getElementById('btn-modal-save');
  btn.disabled = true;
  btn.textContent = 'Saving…';

  try {
    const entry = await apiFetch('/web/api/entries', {
      method: 'POST',
      body: JSON.stringify({ url, title: title || undefined }),
    });
    closeModal();
    showToast('Saved!');
    // Prepend to list if on 'all' or 'unread' filter
    if (state.filter === 'all' || state.filter === 'unread') {
      state.entries.unshift(entry);
      state.total++;
      renderEntries();
    }
  } catch (e) {
    if (e.message?.includes('Already')) {
      showToast('Already saved');
      closeModal();
    } else {
      showToast('Failed to save');
    }
  } finally {
    btn.disabled = false;
    btn.textContent = 'Save';
  }
}

// ── Service Worker ────────────────────────────────────────────────────────────

if ('serviceWorker' in navigator) {
  navigator.serviceWorker.register('/sw.js').catch(() => {});
}

// ── PWA install prompt ────────────────────────────────────────────────────────

let deferredPrompt = null;
window.addEventListener('beforeinstallprompt', e => {
  e.preventDefault();
  deferredPrompt = e;
  // Show subtle install hint after a delay
  setTimeout(() => {
    if (deferredPrompt) showToast('Tip: add bagg to your home screen', 4000);
  }, 8000);
});

// ── Init ──────────────────────────────────────────────────────────────────────

loadEntries();