// ============================================================
// MY RESOURCES
// A person's own generated teaching material.
//
// Separate from the Learning Hub on purpose: that is moderator-owned content
// published into categories for everyone, this is private and needs no role
// beyond being signed in. The server enforces that independently — every query
// there filters on the owner — so this only has to be an honest interface to it.
// ============================================================

(function () {
  var inited = false;

  document.addEventListener('tabChanged', function (e) {
    if (!e.detail || e.detail.tab !== 'myresources') return;
    if (!inited) { init(); inited = true; }
    loadLibrary();
  });

  // What an administrator has switched on. Read once, used by both option
  // groups and by the instruction check.
  var available = { images: false, web: false, pubmed: false };

  // Someone who writes "add a diagram of the airway" in the instructions has
  // said what they want as plainly as ticking the box would. Left alone, the
  // request is simply dropped and the resource comes back without a picture
  // and without a word about why. These are the ways people actually ask.
  var IMAGE_REQUEST = /\b(image|images|diagram|diagrams|illustration|illustrations|illustrate|illustrated|figure|figures|picture|pictures|drawing|drawings|chart|charts|graphic|graphics|infographic|visual|visuals|schematic)\b/i;

  function looksLikeImageRequest(text) {
    return IMAGE_REQUEST.test(String(text || ''));
  }

  // Turning the option on is the honest response: it does what was asked, it is
  // visible, and it can be turned straight back off. Silently ignoring the
  // sentence is not. Once it has been switched off by hand, it stays off —
  // re-ticking it on every keystroke would be a fight.
  function wireImageIntent(textareaId, checkboxId, hintId) {
    var box = document.getElementById(textareaId);
    var check = document.getElementById(checkboxId);
    var hint = document.getElementById(hintId);
    if (!box || !check || !hint) return;
    var overruled = false;
    check.addEventListener('change', function () {
      if (!check.checked) overruled = true;
      if (check.checked) hint.hidden = true;
    });
    box.addEventListener('input', function () {
      var asked = looksLikeImageRequest(box.value);
      if (!asked) { hint.hidden = true; return; }
      if (!available.images) {
        hint.textContent = 'Your instructions mention a figure, but no image model is configured, so none can be made.';
        hint.hidden = false;
        return;
      }
      if (check.checked || overruled) {
        hint.hidden = overruled ? false : true;
        if (overruled) hint.textContent = 'Your instructions ask for a figure. Tick the illustration option above to get one.';
        return;
      }
      check.checked = true;
      hint.textContent = 'Illustration switched on, because your instructions ask for a figure. Untick it if you would rather not.';
      hint.hidden = false;
    });
  }

  function init() {
    var kind = document.getElementById('mr-kind');
    if (kind) kind.addEventListener('change', syncFormatFields);
    syncFormatFields();

    var generate = document.getElementById('btn-mr-generate');
    if (generate) generate.addEventListener('click', runGenerate);

    var refresh = document.getElementById('btn-mr-refresh');
    if (refresh) refresh.addEventListener('click', loadLibrary);

    // One delegated handler: rows are rebuilt on every refresh, so binding per
    // row would leak listeners and miss anything added later.
    var list = document.getElementById('mr-list');
    if (list) list.addEventListener('click', onRowClick);

    // Filtering is local: the whole library is already in hand, so searching it
    // is instant and costs no request.
    var search = document.getElementById('mr-search');
    if (search) search.addEventListener('input', renderLibrary);

    var modify = document.getElementById('btn-mr-modify');
    if (modify) modify.addEventListener('click', runModify);

    wireImageIntent('mr-refinement', 'mr-with-images', 'mr-image-hint');
    wireImageIntent('mr-modify-instructions', 'mr-modify-images', 'mr-modify-image-hint');

    loadOptions();
  }

  // What an administrator has approved. The model row stays hidden unless there
  // is a genuine choice to make — one approved model is not a decision anyone
  // should be asked to take.
  function loadOptions() {
    fetch('/api/my-resources/options', { headers: getAuthHeaders() })
      .then(function (r) { return r.json(); })
      .then(function (data) {
        if (!data || !data.success) return;
        var select = document.getElementById('mr-model');
        var modelRow = document.getElementById('mr-model-row');
        var models = data.models || [];
        if (select) {
          select.textContent = '';
          models.forEach(function (id) {
            var option = document.createElement('option');
            option.value = id;
            option.textContent = id;
            if (id === data.defaultModel) option.selected = true;
            select.appendChild(option);
          });
        }
        if (modelRow) modelRow.hidden = models.length < 2;

        // Hidden entirely unless an administrator enabled it, so an option
        // never appears that someone could tick and then be refused. Both
        // groups are driven from the same answer: Generate and Modify offer
        // the same choices, so they must offer the same ones.
        available = {
          images: Boolean(data.imagesAvailable),
          web: Boolean(data.webSearchAvailable),
          pubmed: Boolean(data.pubmedAvailable)
        };
        [['mr-images-row', 'images'], ['mr-web-row', 'web'], ['mr-pubmed-row', 'pubmed'],
         ['mr-modify-images-row', 'images'], ['mr-modify-web-row', 'web'],
         ['mr-modify-pubmed-row', 'pubmed']].forEach(function (pair) {
          var row = document.getElementById(pair[0]);
          if (row) row.hidden = !available[pair[1]];
        });
      })
      .catch(function () { /* the defaults still work without this */ });
  }

  function syncFormatFields() {
    var isArticle = (document.getElementById('mr-kind') || {}).value === 'article';
    var slides = document.getElementById('mr-slide-count');
    var words = document.getElementById('mr-word-wrap');
    if (slides && slides.parentElement) slides.parentElement.hidden = isArticle;
    if (words) words.hidden = !isArticle;
  }

  function status(text, tone) {
    var el = document.getElementById('mr-status');
    if (!el) return;
    el.textContent = text || '';
    el.style.color = tone === 'bad' ? 'var(--red)' : tone === 'good' ? 'var(--green)' : 'var(--g600)';
  }

  function runGenerate() {
    var topic = (document.getElementById('mr-topic') || {}).value || '';
    if (!topic.trim()) { status('Enter a topic first.', 'bad'); return; }

    var btn = document.getElementById('btn-mr-generate');
    if (btn) { btn.disabled = true; btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Generating...'; }
    status('Searching the library and writing. This takes a moment.');

    var corpusBox = document.getElementById('mr-use-corpus');
    fetch('/api/my-resources/generate', {
      method: 'POST',
      headers: getAuthHeaders(),
      body: JSON.stringify({
        topic: topic.trim(),
        kind: (document.getElementById('mr-kind') || {}).value || 'presentation',
        slideCount: (document.getElementById('mr-slide-count') || {}).value,
        wordCount: (document.getElementById('mr-word-count') || {}).value,
        refinement: (document.getElementById('mr-refinement') || {}).value || '',
        useCorpus: corpusBox && corpusBox.checked === false ? 'false' : 'true',
        model: (document.getElementById('mr-model') || {}).value || '',
        withImages: (document.getElementById('mr-with-images') || {}).checked ? 'true' : 'false',
        withWebSearch: (document.getElementById('mr-web-search') || {}).checked ? 'true' : 'false',
        withPubmed: (document.getElementById('mr-pubmed') || {}).checked ? 'true' : 'false'
      })
    })
      .then(function (r) { return r.json(); })
      .then(function (data) {
        if (!data.success) throw new Error(data.error || 'Generation failed');
        // Say what it was written from. Ungrounded material presented as
        // grounded is the failure worth preventing.
        var g = data.grounding || {};
        status(g.used
          ? 'Saved. Written from ' + g.count + ' library excerpt' + (g.count === 1 ? '' : 's') + '.'
          : 'Saved. Not grounded' + (g.reason ? ' — ' + g.reason : '') + '; written from the model alone.',
          g.used ? 'good' : null);
        reportSearches(data.searches);
        showIllustrations(data.imageJobs || []);
        reportImageFailures(data.imageFailures);
        loadLibrary();
      })
      .catch(function (err) { status(err.message, 'bad'); })
      .finally(function () {
        if (btn) { btn.disabled = false; btn.innerHTML = '<i class="fas fa-wand-magic-sparkles"></i> Generate'; }
      });
  }

  // Say what was searched for. A query that left the network is worth showing
  // plainly rather than leaving someone to wonder whether it happened.
  function reportSearches(searches) {
    (searches || []).forEach(function (s) {
      if (typeof showToast !== 'function') return;
      var where = s.tool === 'pubmed_search' ? 'PubMed' : 'the web';
      showToast(s.count
        ? 'Searched ' + where + ' for "' + s.query + '" \u2014 ' + s.count + ' used.'
        : 'Nothing found on ' + where + ' for "' + s.query + '".', 'info');
    });
  }

  function ticked(id) {
    var el = document.getElementById(id);
    return Boolean(el && el.checked);
  }

  // The shared poller, so an image made here behaves exactly like one made in
  // the assistant: same status line, same durable job, same asset endpoint. It
  // lives in an ES module and this file is a classic script, hence the dynamic
  // import — which also means a failure to load it cannot break generation.
  function reportImageFailures(failures) {
    if (!(failures || []).length || typeof showToast !== 'function') return;
    // Fewer pictures than asked for, without a word, would look like the model
    // ignoring the request rather than the queue refusing it.
    showToast(failures.length === 1
      ? 'One illustration could not be started: ' + failures[0]
      : failures.length + ' illustrations could not be started.', 'error');
  }

  function showIllustrations(jobs) {
    var box = document.getElementById('mr-images');
    if (!box) return;
    box.innerHTML = '';
    if (!jobs.length) return;
    import('/js/generatedImages.js').then(function (m) {
      m.renderImageJobs(box, jobs, 'my_resources', function (card, data) {
        var img = document.createElement('img');
        img.alt = 'Generated teaching illustration';
        img.style.maxWidth = '100%';
        card.append(img);
        m.hydrateImage(img, data.imageUrl).catch(function () { img.alt = 'Private image unavailable'; });
      });
    }).catch(function () {
      if (typeof showToast === 'function') showToast('An illustration was generated but could not be displayed.', 'info');
    });
  }

  // The library as last fetched. Held so searching and the Modify picker both
  // work from one copy rather than each asking the server again.
  var library = [];

  function loadLibrary() {
    var list = document.getElementById('mr-list');
    if (!list) return;
    fetch('/api/my-resources', { headers: getAuthHeaders() })
      .then(function (r) { return r.json(); })
      .then(function (data) {
        library = (data && data.resources) || [];
        renderLibrary();
        syncModifyTargets();
      })
      .catch(function () {
        library = [];
        list.textContent = '';
        var failed = document.createElement('p');
        failed.style.cssText = 'margin:0;font-size:13px;color:var(--red);';
        failed.textContent = 'Could not load your resources.';
        list.appendChild(failed);
        syncModifyTargets();
      });
  }

  function matches(row, needle) {
    if (!needle) return true;
    return (String(row.title || '') + ' ' + String(row.topic || '')).toLowerCase().indexOf(needle) !== -1;
  }

  function renderLibrary() {
    var list = document.getElementById('mr-list');
    if (!list) return;
    var search = document.getElementById('mr-search');
    var needle = String((search && search.value) || '').trim().toLowerCase();
    var rows = library.filter(function (row) { return matches(row, needle); });

    list.textContent = '';
    if (!rows.length) {
      var empty = document.createElement('p');
      empty.style.cssText = 'margin:0;font-size:13px;color:var(--g400);';
      // Two different situations, and saying "nothing yet" to someone whose
      // search simply missed would be wrong.
      empty.textContent = library.length
        ? 'Nothing matches "' + needle + '".'
        : 'Nothing yet. Generate something above and it will appear here.';
      list.appendChild(empty);
      return;
    }
    rows.forEach(function (row) { list.appendChild(renderRow(row)); });
  }

  // The Modify picker is the same library, so it is rebuilt from it — and the
  // selection survives a refresh, because losing it mid-sentence is maddening.
  function syncModifyTargets() {
    var select = document.getElementById('mr-modify-target');
    if (!select) return;
    var previous = select.value;
    select.textContent = '';
    if (!library.length) {
      var none = document.createElement('option');
      none.value = '';
      none.textContent = 'Nothing to modify yet';
      select.appendChild(none);
      select.disabled = true;
      return;
    }
    select.disabled = false;
    library.forEach(function (row) {
      var option = document.createElement('option');
      option.value = String(row.id);
      option.textContent = (row.title || 'Untitled') +
        ' \u2014 ' + (row.kind === 'article' ? 'article' : 'presentation');
      select.appendChild(option);
    });
    if (previous && library.some(function (row) { return String(row.id) === previous; })) {
      select.value = previous;
    }
  }

  function runModify() {
    var select = document.getElementById('mr-modify-target');
    var box = document.getElementById('mr-modify-instructions');
    var status = document.getElementById('mr-modify-status');
    var btn = document.getElementById('btn-mr-modify');
    function say(message, tone) {
      if (!status) return;
      status.textContent = message || '';
      status.style.color = tone === 'bad' ? 'var(--red)' : tone === 'good' ? 'var(--green)' : 'var(--g600)';
    }

    var id = select && select.value;
    var instructions = String((box && box.value) || '').trim();
    if (!id) return say('Nothing to modify yet.', 'bad');
    if (!instructions) return say('Say what to change.', 'bad');

    if (btn) { btn.disabled = true; btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Applying'; }
    say('Rewriting…');
    fetch('/api/my-resources/' + encodeURIComponent(id) + '/refine', {
      method: 'POST',
      headers: getAuthHeaders(),
      body: JSON.stringify({
        instructions: instructions,
        useCorpus: ticked('mr-modify-corpus') ? 'true' : 'false',
        withPubmed: ticked('mr-modify-pubmed') ? 'true' : 'false',
        withWebSearch: ticked('mr-modify-web-search') ? 'true' : 'false',
        withImages: ticked('mr-modify-images') ? 'true' : 'false',
        model: (document.getElementById('mr-model') || {}).value || ''
      })
    })
      .then(function (r) { return r.json(); })
      .then(function (data) {
        if (!data.success) throw new Error(data.error || 'Could not apply the changes');
        // Same reporting as generating: what it was written from, what was
        // searched, and any figure that came back.
        var g = data.grounding || {};
        say('Applied' + (g.used ? ', using ' + g.count + ' library excerpt' + (g.count === 1 ? '' : 's') : '') +
            '. Download it to see the result.', 'good');
        reportSearches(data.searches);
        showIllustrations(data.imageJobs || []);
        reportImageFailures(data.imageFailures);
        if (box) box.value = '';
        loadLibrary();
      })
      .catch(function (err) { say(err.message, 'bad'); })
      .finally(function () {
        if (btn) { btn.disabled = false; btn.innerHTML = '<i class="fas fa-pen-to-square"></i> Apply changes'; }
      });
  }

  // Built as elements rather than innerHTML: a title comes from a model, and
  // this is the one place it reaches the page.
  function renderRow(row) {
    var wrap = document.createElement('div');
    wrap.className = 'saved-enc-item';
    wrap.style.cssText = 'padding:8px 12px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;';

    var body = document.createElement('div');
    body.style.flex = '1';
    body.style.minWidth = '180px';

    var title = document.createElement('div');
    title.style.cssText = 'font-weight:600;font-size:13px;';
    title.textContent = row.title || 'Untitled';

    var meta = document.createElement('div');
    meta.style.cssText = 'font-size:11px;color:var(--g500);';
    meta.textContent = (row.kind === 'article' ? 'Article' : 'Presentation') +
      ' · ' + new Date(row.created_at).toLocaleString() +
      (row.grounded_count ? ' · ' + row.grounded_count + ' library excerpts' : ' · not grounded');

    body.appendChild(title);
    body.appendChild(meta);
    wrap.appendChild(body);

    // An article has no slides, so offering PowerPoint would produce a deck of
    // paragraphs. A presentation as Word is fine — prose absorbs slide content
    // without overflowing anything.
    var formats = row.kind === 'article' ? ['docx', 'pdf'] : ['pptx', 'docx', 'pdf'];
    formats.forEach(function (format) {
      var btn = document.createElement('button');
      btn.className = 'btn-sm btn-ghost';
      btn.type = 'button';
      btn.dataset.download = String(row.id);
      btn.dataset.format = format;
      btn.textContent = format.toUpperCase();
      btn.title = 'Download as ' + format.toUpperCase();
      wrap.appendChild(btn);
    });

    var del = document.createElement('button');
    del.className = 'btn-sm btn-ghost';
    del.type = 'button';
    del.dataset.remove = String(row.id);
    del.style.color = 'var(--red)';
    del.title = 'Delete';
    var icon = document.createElement('i');
    icon.className = 'fas fa-trash';
    del.appendChild(icon);
    wrap.appendChild(del);

    return wrap;
  }

  function onRowClick(event) {
    var download = event.target.closest && event.target.closest('[data-download]');
    if (download) return downloadResource(download.dataset.download, download.dataset.format, download);

    var remove = event.target.closest && event.target.closest('[data-remove]');
    if (remove) {
      showConfirm('Delete this resource? This cannot be undone.', function () {
        fetch('/api/my-resources/' + encodeURIComponent(remove.dataset.remove), {
          method: 'DELETE', headers: getAuthHeaders()
        })
          .then(function (r) { return r.json(); })
          .then(function (d) {
            if (!d.success) throw new Error(d.error || 'Could not delete');
            loadLibrary();
          })
          .catch(function (err) { showToast(err.message, 'error'); });
      }, { danger: true, confirmText: 'Delete' });
    }
  }

  // Fetched rather than linked, because the download needs the auth header and
  // an <a href> cannot carry one.
  function downloadResource(id, format, btn) {
    var original = btn.textContent;
    btn.disabled = true;
    btn.textContent = '...';
    fetch('/api/my-resources/' + encodeURIComponent(id) + '/export?format=' + encodeURIComponent(format), {
      headers: getAuthHeaders()
    })
      .then(function (r) {
        if (!r.ok) return r.json().then(function (d) { throw new Error(d.error || 'Download failed'); });
        var name = 'resource.' + format;
        var disposition = r.headers.get('Content-Disposition') || '';
        var match = disposition.match(/filename="([^"]+)"/);
        if (match) name = match[1];
        return r.blob().then(function (blob) { saveBlob(blob, name); });
      })
      .catch(function (err) { showToast(err.message, 'error'); })
      .finally(function () { btn.disabled = false; btn.textContent = original; });
  }

  function saveBlob(blob, name) {
    var url = URL.createObjectURL(blob);
    var link = document.createElement('a');
    link.href = url;
    link.download = name;
    document.body.appendChild(link);
    link.click();
    link.remove();
    setTimeout(function () { URL.revokeObjectURL(url); }, 1000);
  }
}());