// MarkLite — Search & Replace Module
(function () {
  'use strict';
  var ML = window.MarkLite;

  var searchMatches = [];
  var searchIndex = -1;
  var searchCaseSensitive = false;
  var searchUseRegex = false;

  ML.openSearch = function (showReplace) {
    ML.searchBar.classList.remove('hidden');
    ML.replaceRow.classList.toggle('hidden', !showReplace);
    ML.searchInput.focus();
    var selected = ML.editor.value.substring(ML.editor.selectionStart, ML.editor.selectionEnd);
    if (selected && !selected.includes('\n')) ML.searchInput.value = selected;
    doSearch();
  };

  ML.closeSearch = function () {
    ML.searchBar.classList.add('hidden');
    clearHighlights();
    searchMatches = []; searchIndex = -1;
    ML.searchCount.textContent = '';
    ML.editor.focus();
  };

  ML.toggleSearchOption = function (type) {
    if (type === 'case') { searchCaseSensitive = !searchCaseSensitive; ML.btnCase.classList.toggle('active', searchCaseSensitive); }
    else { searchUseRegex = !searchUseRegex; ML.btnRegex.classList.toggle('active', searchUseRegex); }
    doSearch();
  };

  function doSearch() {
    clearHighlights();
    var text = ML.searchInput.value;
    if (!text) { searchMatches = []; searchIndex = -1; ML.searchCount.textContent = ''; return; }
    searchMatches = findMatches(text);
    if (searchMatches.length > 0) {
      var cursor = ML.editor.selectionStart;
      searchIndex = searchMatches.findIndex(function (m) { return m.start >= cursor; });
      if (searchIndex === -1) searchIndex = 0;
      scrollToMatch(searchIndex);
    } else { searchIndex = -1; }
    ML.searchCount.textContent = searchMatches.length > 0 ? (searchIndex + 1) + '/' + searchMatches.length : '无结果';
    highlightMatches();
  }

  function findMatches(text) {
    var content = ML.editor.value;
    var matches = [];
    if (searchUseRegex) {
      try {
        var flags = searchCaseSensitive ? 'g' : 'gi';
        var regex = new RegExp(text, flags);
        var m;
        while ((m = regex.exec(content)) !== null) {
          matches.push({ start: m.index, end: m.index + m[0].length });
          if (m[0].length === 0) regex.lastIndex++;
        }
      } catch (e) { /* invalid regex */ }
    } else {
      var haystack = searchCaseSensitive ? content : content.toLowerCase();
      var needle = searchCaseSensitive ? text : text.toLowerCase();
      var idx = 0;
      while ((idx = haystack.indexOf(needle, idx)) !== -1) {
        matches.push({ start: idx, end: idx + needle.length });
        idx += needle.length;
      }
    }
    return matches;
  }

  function highlightMatches() {
    clearHighlights();
    if (searchMatches.length === 0) return;
    var content = ML.editor.value;
    var lineHeight = parseFloat(getComputedStyle(ML.editor).lineHeight) || 20.8;
    var editorStyle = getComputedStyle(ML.editor);
    var paddingTop = parseFloat(editorStyle.paddingTop);
    var paddingLeft = parseFloat(editorStyle.paddingLeft);
    var lineStarts = [0];
    for (var i = 0; i < content.length; i++) { if (content.charCodeAt(i) === 10) lineStarts.push(i + 1); }
    function posToXY(pos) {
      var line = 0;
      for (var _i = 0; _i < lineStarts.length; _i++) { if (lineStarts[_i] > pos) break; line = _i; }
      return { top: line * lineHeight + paddingTop, left: (pos - lineStarts[line]) * ML.getCharWidth() + paddingLeft };
    }
    var overlay = document.createElement('div');
    overlay.id = 'search-highlights';
    overlay.style.cssText = 'position:absolute;top:0;left:0;right:0;bottom:0;pointer-events:none;overflow:hidden;z-index:1;';
    var wrapper = document.getElementById('editor-wrapper');
    wrapper.style.position = 'relative';
    wrapper.appendChild(overlay);
    for (var _i2 = 0; _i2 < searchMatches.length; _i2++) {
      var m = searchMatches[_i2];
      var startPos = posToXY(m.start);
      var endPos = posToXY(m.end);
      var isCurrent = _i2 === searchIndex;
      var div = document.createElement('div');
      div.className = 'search-hl' + (isCurrent ? ' current' : '');
      div.style.cssText = 'position:absolute;top:' + startPos.top + 'px;left:' + startPos.left + 'px;height:' + lineHeight + 'px;width:' + Math.max(endPos.left - startPos.left, 8) + 'px;';
      overlay.appendChild(div);
    }
  }

  function clearHighlights() { var old = document.getElementById('search-highlights'); if (old) old.remove(); }

  function scrollToMatch(index) {
    if (index < 0 || index >= searchMatches.length) return;
    searchIndex = index;
    var m = searchMatches[index];
    ML.editor.setSelectionRange(m.start, m.end);
    var lineHeight = parseFloat(getComputedStyle(ML.editor).lineHeight) || 20.8;
    var content = ML.editor.value;
    var line = 0;
    for (var i = 0; i < m.start; i++) { if (content.charCodeAt(i) === 10) line++; }
    var matchTop = line * lineHeight;
    var viewTop = ML.editor.scrollTop;
    var viewBottom = viewTop + ML.editor.clientHeight;
    if (matchTop < viewTop + 40 || matchTop > viewBottom - 40) ML.editor.scrollTop = matchTop - ML.editor.clientHeight / 2;
    ML.searchCount.textContent = (index + 1) + '/' + searchMatches.length;
    highlightMatches();
  }

  ML.findNext = function () { if (searchMatches.length === 0) return; scrollToMatch((searchIndex + 1) % searchMatches.length); };
  ML.findPrev = function () { if (searchMatches.length === 0) return; scrollToMatch((searchIndex - 1 + searchMatches.length) % searchMatches.length); };

  ML.replaceCurrent = function () {
    if (searchMatches.length === 0 || searchIndex < 0) return;
    var m = searchMatches[searchIndex];
    ML.editor.setSelectionRange(m.start, m.end);
    document.execCommand('insertText', false, ML.replaceInput.value);
    doSearch();
  };

  ML.replaceAll = function () {
    if (searchMatches.length === 0) return;
    var replacement = ML.replaceInput.value;
    for (var i = searchMatches.length - 1; i >= 0; i--) {
      var m = searchMatches[i];
      ML.editor.setSelectionRange(m.start, m.end);
      document.execCommand('insertText', false, replacement);
    }
    doSearch();
  };

  ML.initSearchBar = function () {
    ML.searchInput.addEventListener('input', doSearch);
    ML.btnCase.addEventListener('click', function () { ML.toggleSearchOption('case'); });
    ML.btnRegex.addEventListener('click', function () { ML.toggleSearchOption('regex'); });
    ML.btnNext.addEventListener('click', ML.findNext);
    ML.btnPrev.addEventListener('click', ML.findPrev);
    ML.btnSearchClose.addEventListener('click', ML.closeSearch);
    ML.btnReplace.addEventListener('click', ML.replaceCurrent);
    ML.btnReplaceAll.addEventListener('click', ML.replaceAll);
  };
})();