/* The address-list dialog of the analytics pages (markup: the "analytics_dialog"
   template) and the tooltip that goes with it. A page loads a list with
   AnalyticsDialog.load(url, title), then shows it with AnalyticsDialog.fill(m);
   copying and the CSV download work on the list shown last. */
(function () {
  'use strict';

  function $(id) { return document.getElementById(id); }
  function fmt(n) { return Math.round(n).toLocaleString('ru-RU'); }
  function esc(s) {
    return String(s).replace(/[&<>"']/g, function (c) {
      return { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c];
    });
  }
  function tipAttr(t) { return 'data-tip="' + esc(t) + '"'; }

  var cur = null; // the list shown in the dialog

  function csvText(cols, rows) {
    function q(v) { return '"' + String(v).replace(/"/g, '""') + '"'; }
    return [cols].concat(rows).map(function (r) { return r.map(q).join(','); }).join('\r\n') + '\r\n';
  }

  function open() {
    var d = $('an-dlg');
    if (d.open) return;
    if (d.showModal) d.showModal(); else d.setAttribute('open', '');
  }

  /* m: title, note, scope ("Запуск" by default), runLabel, cols, rows, hints
     (column index -> text), cellHints (column index -> function of the value),
     dist (HTML above the table), csvURL (the file behind "Скачать CSV"). */
  function fill(m) {
    cur = m;
    $('an-dlg-title').textContent = m.title + ' · ' + fmt(m.rows.length);
    $('an-dlg-note').textContent = (m.scope || 'Запуск') + ': ' + m.runLabel + '. ' + m.note;
    $('an-dlg-dist').hidden = !m.dist;
    $('an-dlg-dist').innerHTML = m.dist || '';
    var hint = m.hints || {};
    $('an-dlg-tbl').innerHTML = '<thead><tr>' + m.cols.map(function (c, i) {
      return hint[i] ? '<th ' + tipAttr(hint[i]) + ' tabindex="0">' + esc(c) + '<span class="an-hint" aria-hidden="true">ⓘ</span></th>' : '<th>' + esc(c) + '</th>';
    }).join('') + '</tr></thead><tbody>' + m.rows.map(function (x) {
      return '<tr>' + x.map(function (v, i) {
        var h = m.cellHints && m.cellHints[i] ? m.cellHints[i](v) : '';
        return '<td class="' + (i < 2 ? 'an-a' : '') + '"' + (h ? ' ' + tipAttr(h) : '') + '>' + esc(v) + '</td>';
      }).join('') + '</tr>';
    }).join('') + '</tbody>';
    $('an-dlg-msg').textContent = '';
  }

  /* Opens the dialog with the title and "Загрузка…", fetches the list as JSON;
     resolves with it, or with null (and a message in the dialog) on a failure. */
  function load(url, title) {
    $('an-dlg-title').textContent = title;
    $('an-dlg-note').textContent = 'Загрузка…';
    $('an-dlg-dist').hidden = true;
    $('an-dlg-tbl').innerHTML = '';
    $('an-dlg-msg').textContent = '';
    cur = null;
    open();
    return fetch(url, { headers: { Accept: 'application/json' }, credentials: 'same-origin' })
      .then(function (r) { if (!r.ok) throw new Error('HTTP ' + r.status); return r.json(); })
      .then(function (l) { return l; })
      .catch(function (e) {
        $('an-dlg-note').textContent = 'Не удалось загрузить список: ' + e.message;
        return null;
      });
  }

  function copyCsv() {
    var msg = $('an-dlg-msg');
    if (!cur) return;
    var text = csvText(cur.cols, cur.rows);
    var done = function () { msg.textContent = 'CSV скопирован в буфер обмена.'; };
    var fail = function () { msg.textContent = 'Буфер обмена недоступен в этом окне.'; };
    if (navigator.clipboard && navigator.clipboard.writeText) navigator.clipboard.writeText(text).then(done, fail); else fail();
  }

  function downloadCsv() {
    if (!cur) return;
    window.location.href = cur.csvURL;
  }

  $('an-dlg-csv').addEventListener('click', downloadCsv);
  $('an-dlg-copy').addEventListener('click', copyCsv);
  $('an-dlg-close').addEventListener('click', function () { $('an-dlg').close(); });
  $('an-dlg').addEventListener('click', function (e) { if (e.target === $('an-dlg')) $('an-dlg').close(); });

  /* tooltip: moved into the open dialog, otherwise the modal's top layer covers it */
  var tip = $('an-tip');
  function tipHost() { var d = $('an-dlg'); return d && d.open ? d : document.body; }
  document.addEventListener('mouseover', function (e) {
    var t = e.target.closest('[data-tip]');
    if (!t) return;
    var h = tipHost();
    if (tip.parentNode !== h) h.appendChild(tip);
    tip.textContent = t.dataset.tip;
    tip.style.opacity = 1;
  });
  document.addEventListener('mousemove', function (e) {
    tip.style.left = Math.max(8, Math.min(e.clientX + 14, window.innerWidth - 376)) + 'px';
    tip.style.top = (e.clientY + 16) + 'px';
  });
  document.addEventListener('mouseout', function (e) { if (e.target.closest('[data-tip]')) tip.style.opacity = 0; });

  window.AnalyticsDialog = { $: $, fmt: fmt, esc: esc, tipAttr: tipAttr, load: load, fill: fill };
})();