/* eslint-disable */
// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

// Define search commands. Depends on dialog.js or another
// implementation of the openDialog method.

// Replace works a little oddly -- it will do the replace on the next
// Ctrl-G (or whatever is bound to findNext) press. You prevent a
// replace by making sure the match is no longer selected when hitting
// Ctrl-G.

export default function(CodeMirror) {
  "use strict";

  function searchOverlay(query) {
    return {token: function(stream) {
      query.lastIndex = stream.pos;
      var match = query.exec(stream.string);
      if (match && match.index == stream.pos) {
        stream.pos += match[0].length || 1;
        return "searching";
      } else if (match) {
        stream.pos = match.index;
      } else {
        stream.skipToEnd();
      }
    }};
  }

  function SearchState() {
    this.posFrom = this.posTo = this.lastQuery = this.query = null;
    this.overlay = null;
    this.regexp = false;
    this.caseInsensitive = true;
    this.wholeWord = false;
  }

  function getSearchState(cm) {
    return cm.state.search || (cm.state.search = new SearchState());
  }

  function getSearchCursor(cm, query, pos) {
    return cm.getSearchCursor(query, pos, getSearchState(cm).caseInsensitive);
  }

  function isMouseClick(event) {
    if(event.detail > 0) return true;
    else return false;
  }

  function persistentDialog(cm, text, deflt, onEnter, onKeyDown) {
    var searchField = document.getElementsByClassName("CodeMirror-search-field")[0];
    if (!searchField) {
      cm.openDialog(text, onEnter, {
        value: deflt,
        selectValueOnOpen: true,
        closeOnEnter: false,
        onClose: function () {
          clearSearch(cm);
        },
        onKeyDown: onKeyDown,
        closeOnBlur: false
      });

      searchField = document.getElementsByClassName("CodeMirror-search-field")[0];

      var dialog = document.getElementsByClassName("CodeMirror-dialog")[0];
      var closeButton = dialog.getElementsByClassName("close")[0];

      var state = getSearchState(cm);

      CodeMirror.on(searchField, "keyup", function (e) {
        if (e.keyCode !== 13 && searchField.value.length > 1) { // not enter and more than 1 character to search
          startSearch(cm, getSearchState(cm), searchField.value);
        } else if (searchField.value.length <= 1) {
          cm.display.wrapper.querySelector('.CodeMirror-search-results').innerText = '';
        }
      });

      CodeMirror.on(closeButton, "click", function () {
        clearSearch(cm);
        dialog.parentNode.removeChild(dialog);
        cm.focus();
      });

      var upArrow = dialog.getElementsByClassName("up-arrow")[0];
      CodeMirror.on(upArrow, "click", function () {
        CodeMirror.commands.findPrev(cm);
        searchField.blur();
        cm.focus();
      });

      var downArrow = dialog.getElementsByClassName("down-arrow")[0];
      CodeMirror.on(downArrow, "click", function () {
        CodeMirror.commands.findNext(cm);
        searchField.blur();
        cm.focus();
      });

      var regexpButton = dialog.getElementsByClassName("CodeMirror-regexp-button")[0];
      CodeMirror.on(regexpButton, "click", function (event) {
        var state = getSearchState(cm);
        state.regexp = toggle(regexpButton);
        startSearch(cm, getSearchState(cm), searchField.value);
        if(isMouseClick(event)) searchField.focus();
      });

      toggle(regexpButton, state.regexp);

      var caseSensitiveButton = dialog.getElementsByClassName("CodeMirror-case-button")[0];
      CodeMirror.on(caseSensitiveButton, "click", function (event) {
        var state = getSearchState(cm);
        state.caseInsensitive = !toggle(caseSensitiveButton);
        startSearch(cm, getSearchState(cm), searchField.value);
        if(isMouseClick(event)) searchField.focus();
      });

      toggle(caseSensitiveButton, !state.caseInsensitive);

      var wholeWordButton = dialog.getElementsByClassName("CodeMirror-word-button")[0];
      CodeMirror.on(wholeWordButton, "click", function (event) {
        var state = getSearchState(cm);
        state.wholeWord = toggle(wholeWordButton);
        startSearch(cm, getSearchState(cm), searchField.value);
        if(isMouseClick(event)) searchField.focus();
      });

      toggle(wholeWordButton, state.wholeWord);

      function toggle(el, initialState) {
        var currentState, nextState;

        if (initialState == null) {
          currentState = el.getAttribute('aria-checked') === 'true';
          nextState = !currentState;
        } else {
          nextState = initialState;
        }
        
        el.setAttribute('aria-checked', nextState);
        return nextState;
      }
    } else {
      searchField.focus();
    }
  }

  function dialog(cm, text, shortText, deflt, f) {
    if (cm.openDialog) cm.openDialog(text, f, {value: deflt, selectValueOnOpen: true});
    else f(prompt(shortText, deflt));
  }

  var lastSelectedIndex = 0;
  function confirmDialog(cm, text, shortText, fs) {
    if (cm.openConfirm) cm.openConfirm(text, fs);
    else if (confirm(shortText)) fs[0]();

    var dialog = document.getElementsByClassName("CodeMirror-dialog")[0];
    var buttons = dialog.getElementsByTagName("button");
    buttons[lastSelectedIndex].focus();
    for (var i = 0; i < buttons.length; i += 1) {
      (function (index) {
        var button = buttons[index];
        button.addEventListener("focus", function (e) {
          lastSelectedIndex = index === buttons.length - 1 ? 0 : index;
        });
        button.addEventListener("keyup", function (e) {
          if (e.keyCode === 37) { // arrow left
            var prevButton = index === 0 ? buttons.length - 1 : index - 1;
            buttons[prevButton].focus();
          }
          if (e.keyCode === 39) { // arrow right
            var nextButton = index === buttons.length - 1 ? 0 : index + 1;
            buttons[nextButton].focus();
          }
          if (e.keyCode === 27) { // esc
            cm.focus();
          }
        });
        button.addEventListener("click", function () {
          if (index === buttons.length - 1) { // "done"
            lastSelectedIndex = 0;
          }
        })
      })(i);
    }
  }

  function parseString(string) {
    return string.replace(/\\(.)/g, function(_, ch) {
      if (ch == "n") return "\n"
      if (ch == "r") return "\r"
      return ch
    })
  }

  /*
    Parses the query text and state and returns
    a RegExp ready for searching
  */
  function parseQuery(query, state) {
    var emptyQuery = 'x^'; // matches nothing

    if (query === '') { // empty string matches nothing
      query = emptyQuery;
    } else {
      if (state.regexp === false) {
        query = parseString(query);
        query = query.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
      }

      if (state.wholeWord) {
        query += '\\b';
      }
    }

    var regexp;

    try {
      regexp = new RegExp(query, state.caseInsensitive ? "gi" : "g");
    } catch (e) {
      regexp = new RegExp(emptyQuery, 'g');
    }

    // If the resulting regexp will match everything, do not use it
    if (regexp.test('')) {
      return new RegExp(emptyQuery, 'g');
    }

    return regexp;
  }

  var queryDialog = `
    <h3 class="CodeMirror-search-title">Find</h3>
    <input type="text" class="search-input CodeMirror-search-field" placeholder="Find in files" />
    <div class="CodeMirror-search-actions">
      <div class="CodeMirror-search-modifiers button-wrap">
        <button
          title="Regular expression"
          aria-label="Regular expression"
          role="checkbox"
          class="CodeMirror-search-modifier-button CodeMirror-regexp-button"
        >
          <span aria-hidden="true" class="button">.*</span>
        </button>
        <button
          title="Case sensitive"
          aria-label="Case sensitive"
          role="checkbox"
          class="CodeMirror-search-modifier-button CodeMirror-case-button"
        >
          <span aria-hidden="true" class="button">Aa</span>
        </button>
        <button
          title="Whole words"
          aria-label="Whole words"
          role="checkbox"
          class="CodeMirror-search-modifier-button CodeMirror-word-button"
        >
          <span aria-hidden="true" class="button">" "</span>
        </button>
      </div>
      <div class="CodeMirror-search-nav">
        <button class="CodeMirror-search-results"></button>
        <button
          title="Previous"
          aria-label="Previous"
          class="CodeMirror-search-button icon up-arrow prev"
        >
        </button>
        <button
          title="Next"
          aria-label="Next"
          class="CodeMirror-search-button icon down-arrow next"
        >
        </button>
      </div>
    </div>
    <button
      title="Close"
      aria-label="Close"
      class="CodeMirror-close-button close icon">
    </button>
  `;

  function startSearch(cm, state, originalQuery) {
    state.queryText = originalQuery;
    state.query = parseQuery(originalQuery, state);

    cm.removeOverlay(state.overlay, state.caseInsensitive);
    state.overlay = searchOverlay(state.query);
    cm.addOverlay(state.overlay);
    if (cm.showMatchesOnScrollbar) {
      if (state.annotate) { state.annotate.clear(); state.annotate = null; }
      state.annotate = cm.showMatchesOnScrollbar(state.query,  state.caseInsensitive);
    }
    if (originalQuery) {
      return findNext(cm, false);
    }
  }

  function doSearch(cm, rev, persistent, immediate, ignoreQuery) {
    var state = getSearchState(cm);
    if (!ignoreQuery && state.query) return findNext(cm, rev);
    var q = cm.getSelection() || state.lastQuery;
    if (persistent && cm.openDialog) {
      var hiding = null
      var searchNext = function(query, event) {
        CodeMirror.e_stop(event);
        if (!query) return;
        if (query != state.queryText) {
          startSearch(cm, state, query);
          state.posFrom = state.posTo = cm.getCursor();
        }
        if (hiding) hiding.style.opacity = 1
        findNext(cm, event.shiftKey, function(_, to) {
          var dialog
          if (to.line < 3 && document.querySelector &&
            (dialog = cm.display.wrapper.querySelector(".CodeMirror-dialog")) &&
            dialog.getBoundingClientRect().bottom - 4 > cm.cursorCoords(to, "window").top)
            (hiding = dialog).style.opacity = .4
        })
      };
      persistentDialog(cm, queryDialog, q, searchNext, function(event, query) {
        var keyName = CodeMirror.keyName(event)
        var cmd = CodeMirror.keyMap[cm.getOption("keyMap")][keyName]
        if (!cmd) cmd = cm.getOption('extraKeys')[keyName]
        if (cmd == "findNext" || cmd == "findPrev" ||
          cmd == "findPersistentNext" || cmd == "findPersistentPrev") {
          CodeMirror.e_stop(event);
          startSearch(cm, getSearchState(cm), query);
          cm.execCommand(cmd);
        } else if (cmd == "find" || cmd == "findPersistent") {
          CodeMirror.e_stop(event);
          searchNext(query, event);
        }
      });
      if (immediate && q) {
        startSearch(cm, state, q);
        findNext(cm, rev);
      }
    } else {
      dialog(cm, queryDialog, "Search for:", q, function(query) {
        if (query && !state.query) cm.operation(function() {
          startSearch(cm, state, query);
          state.posFrom = state.posTo = cm.getCursor();
          findNext(cm, rev);
        });
      });
    }
  }

  function findNext(cm, rev, callback) {cm.operation(function() {
    var state = getSearchState(cm);
    var cursor = getSearchCursor(cm, state.query, rev ? state.posFrom : state.posTo);
    if (!cursor.find(rev)) {
      cursor = getSearchCursor(cm, state.query, rev ? CodeMirror.Pos(cm.lastLine()) : CodeMirror.Pos(cm.firstLine(), 0));
      if (!cursor.find(rev)) {
        cm.display.wrapper.querySelector('.CodeMirror-search-results').innerText = '';
        return;
      }
    }
    cm.setSelection(cursor.from(), cursor.to());
    cm.scrollIntoView({from: cursor.from(), to: cursor.to()}, 60);
    state.posFrom = cursor.from(); state.posTo = cursor.to();
    var num_match = cm.state.search.annotate.matches.length;
    var next = cm.state.search.annotate.matches
      .findIndex(s => s.from.ch === cursor.from().ch && s.from.line === cursor.from().line) + 1;
    var text_match = next + '/' + num_match;
    cm.display.wrapper.querySelector('.CodeMirror-search-results').innerText = text_match;
    if (callback) callback(cursor.from(), cursor.to())
  });}

  function clearSearch(cm) {cm.operation(function() {
    var state = getSearchState(cm);
    state.lastQuery = state.queryText;
    if (!state.query) return;
    state.query = state.queryText = null;
    cm.removeOverlay(state.overlay);
    if (state.annotate) { state.annotate.clear(); state.annotate = null; }
  });}

  var replaceQueryDialog =
    '<input type="text" class="search-input CodeMirror-search-field"/><div class="close icon"></div>';

  var replacementQueryDialog = 'With: <input type="text" class="replace-input CodeMirror-search-field"/>';
  var doReplaceConfirm = "Replace? <button>Yes</button> <button>No</button> <button>All</button> <button>Stop</button>";

  function replaceAll(cm, query, text) {
    cm.operation(function() {
      for (var cursor = getSearchCursor(cm, query); cursor.findNext();) {
        if (typeof query != "string") {
          var match = cm.getRange(cursor.from(), cursor.to()).match(query);
          cursor.replace(text.replace(/\$(\d)/g, function(_, i) {return match[i];}));
        } else cursor.replace(text);
      }
    });
  }

  // TODO: This will need updating if replace is implemented
  function replace(cm, all) {
    var prevDialog = document.getElementsByClassName("CodeMirror-dialog")[0];
    if (prevDialog) {
      clearSearch(cm);
      prevDialog.parentNode.removeChild(prevDialog);
      cm.focus();
    }
    if (cm.getOption("readOnly")) return;
    var query = cm.getSelection() || getSearchState(cm).lastQuery;
    var dialogText = all ? "Replace all:" : "Replace:"
    dialog(cm, dialogText + replaceQueryDialog, dialogText, query, function(query) {
      if (!query) return;
      query = parseQuery(query);
      dialog(cm, replacementQueryDialog, "Replace with:", "", function(text) {
        text = parseString(text)
        if (all) {
          replaceAll(cm, query, text)
        } else {
          clearSearch(cm);
          var cursor = getSearchCursor(cm, query, cm.getCursor("from"));
          var advance = function() {
            var start = cursor.from(), match;
            if (!(match = cursor.findNext())) {
              cursor = getSearchCursor(cm, query);
              if (!(match = cursor.findNext()) ||
                (start && cursor.from().line == start.line && cursor.from().ch == start.ch)) return;
            }
            cm.setSelection(cursor.from(), cursor.to());
            cm.scrollIntoView({from: cursor.from(), to: cursor.to()}, 60);
            confirmDialog(cm, doReplaceConfirm, "Replace?",
              [function() {doReplace(match);}, advance,
                function() {replaceAll(cm, query, text)}]);
          };
          var doReplace = function(match) {
            cursor.replace(typeof query == "string" ? text :
              text.replace(/\$(\d)/g, function(_, i) {return match[i];}));
            advance();
          };
          advance();
        }
      });
    });
  }

  CodeMirror.commands.find = function(cm) {doSearch(cm);};
  CodeMirror.commands.findPersistent = function(cm) { doSearch(cm, false, true, false, true);};
  CodeMirror.commands.findPersistentNext = function(cm) {doSearch(cm, false, true, true);};
  CodeMirror.commands.findPersistentPrev = function(cm) {doSearch(cm, true, true, true);};
  CodeMirror.commands.findNext = doSearch;
  CodeMirror.commands.findPrev = function(cm) {doSearch(cm, true);};
  CodeMirror.commands.clearSearch = clearSearch;
  // CodeMirror.commands.replace = replace;
  // CodeMirror.commands.replaceAll = function(cm) {replace(cm, true);};
};