'use strict';

/**
 * This code is mostly from the old Etherpad. Please help us to comment this code.
 * This helps other people to understand this code better and helps them to improve it.
 * TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
 */

/**
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const browser = require('./browser');
const hooks = require('./pluginfw/hooks');
const padutils = require('./pad_utils').padutils;
const padeditor = require('./pad_editor').padeditor;
const padsavedrevs = require('./pad_savedrevs');
const _ = require('underscore');
require('./vendors/nice-select');

const ToolbarItem = function (element) {
  this.$el = element;
};

ToolbarItem.prototype.getCommand = function () {
  return this.$el.attr('data-key');
};

ToolbarItem.prototype.getValue = function () {
  if (this.isSelect()) {
    return this.$el.find('select').val();
  }
};

ToolbarItem.prototype.setValue = function (val) {
  if (this.isSelect()) {
    return this.$el.find('select').val(val);
  }
};


ToolbarItem.prototype.getType = function () {
  return this.$el.attr('data-type');
};

ToolbarItem.prototype.isSelect = function () {
  return this.getType() === 'select';
};

ToolbarItem.prototype.isButton = function () {
  return this.getType() === 'button';
};

ToolbarItem.prototype.bind = function (callback) {
  const self = this;

  if (self.isButton()) {
    self.$el.click((event) => {
      $(':focus').blur();
      callback(self.getCommand(), self);
      event.preventDefault();
    });
  } else if (self.isSelect()) {
    self.$el.find('select').change(() => {
      callback(self.getCommand(), self);
    });
  }
};


const padeditbar = (function () {
  const syncAnimationFn = () => {
    const SYNCING = -100;
    const DONE = 100;
    let state = DONE;
    const fps = 25;
    const step = 1 / fps;
    const T_START = -0.5;
    const T_FADE = 1.0;
    const T_GONE = 1.5;
    const animator = padutils.makeAnimationScheduler(() => {
      if (state === SYNCING || state === DONE) {
        return false;
      } else if (state >= T_GONE) {
        state = DONE;
        $('#syncstatussyncing').css('display', 'none');
        $('#syncstatusdone').css('display', 'none');
        return false;
      } else if (state < 0) {
        state += step;
        if (state >= 0) {
          $('#syncstatussyncing').css('display', 'none');
          $('#syncstatusdone').css('display', 'block').css('opacity', 1);
        }
        return true;
      } else {
        state += step;
        if (state >= T_FADE) {
          $('#syncstatusdone').css('opacity', (T_GONE - state) / (T_GONE - T_FADE));
        }
        return true;
      }
    }, step * 1000);
    return {
      syncing: () => {
        state = SYNCING;
        $('#syncstatussyncing').css('display', 'block');
        $('#syncstatusdone').css('display', 'none');
      },
      done: () => {
        state = T_START;
        animator.scheduleAnimation();
      },
    };
  };
  const syncAnimation = syncAnimationFn();

  const self = {
    init() {
      const self = this;
      self.dropdowns = [];

      $('#editbar .editbarbutton').attr('unselectable', 'on'); // for IE
      this.enable();
      $('#editbar [data-key]').each(function () {
        $(this).unbind('click');
        (new ToolbarItem($(this))).bind((command, item) => {
          self.triggerCommand(command, item);
        });
      });

      $('body:not(#editorcontainerbox)').on('keydown', (evt) => {
        bodyKeyEvent(evt);
      });

      $('.show-more-icon-btn').click(() => {
        $('.toolbar').toggleClass('full-icons');
      });
      self.checkAllIconsAreDisplayedInToolbar();
      $(window).resize(_.debounce(self.checkAllIconsAreDisplayedInToolbar, 100));

      registerDefaultCommands(self);

      hooks.callAll('postToolbarInit', {
        toolbar: self,
        ace: padeditor.ace,
      });

      /*
       * On safari, the dropdown in the toolbar gets hidden because of toolbar
       * overflow:hidden property. This is a bug from Safari: any children with
       * position:fixed (like the dropdown) should be displayed no matter
       * overflow:hidden on parent
       */
      if (!browser.safari) {
        $('select').niceSelect();
      }

      // When editor is scrolled, we add a class to style the editbar differently
      $('iframe[name="ace_outer"]').contents().scroll(function () {
        $('#editbar').toggleClass('editor-scrolled', $(this).scrollTop() > 2);
      });
    },
    isEnabled: () => true,
    disable: () => {
      $('#editbar').addClass('disabledtoolbar').removeClass('enabledtoolbar');
    },
    enable: () => {
      $('#editbar').addClass('enabledtoolbar').removeClass('disabledtoolbar');
    },
    commands: {},
    registerCommand(cmd, callback) {
      this.commands[cmd] = callback;
      return this;
    },
    registerDropdownCommand(cmd, dropdown) {
      dropdown = dropdown || cmd;
      self.dropdowns.push(dropdown);
      this.registerCommand(cmd, () => {
        self.toggleDropDown(dropdown);
      });
    },
    registerAceCommand(cmd, callback) {
      this.registerCommand(cmd, (cmd, ace, item) => {
        ace.callWithAce((ace) => {
          callback(cmd, ace, item);
        }, cmd, true);
      });
    },
    triggerCommand(cmd, item) {
      if (self.isEnabled() && this.commands[cmd]) {
        this.commands[cmd](cmd, padeditor.ace, item);
      }
      if (padeditor.ace) padeditor.ace.focus();
    },
    toggleDropDown: (moduleName, cb) => {
      // do nothing if users are sticked
      if (moduleName === 'users' && $('#users').hasClass('stickyUsers')) {
        return;
      }

      $('.nice-select').removeClass('open');
      $('.toolbar-popup').removeClass('popup-show');

      // hide all modules and remove highlighting of all buttons
      if (moduleName === 'none') {
        const returned = false;
        for (let i = 0; i < self.dropdowns.length; i++) {
          const thisModuleName = self.dropdowns[i];

          // skip the userlist
          if (thisModuleName === 'users') continue;

          const module = $(`#${thisModuleName}`);

          // skip any "force reconnect" message
          const isAForceReconnectMessage = module.find('button#forcereconnect:visible').length > 0;
          if (isAForceReconnectMessage) continue;
          if (module.hasClass('popup-show')) {
            $(`li[data-key=${thisModuleName}] > a`).removeClass('selected');
            module.removeClass('popup-show');
          }
        }

        if (!returned && cb) return cb();
      } else {
        // hide all modules that are not selected and remove highlighting
        // respectively add highlighting to the corresponding button
        for (let i = 0; i < self.dropdowns.length; i++) {
          const thisModuleName = self.dropdowns[i];
          const module = $(`#${thisModuleName}`);

          if (module.hasClass('popup-show')) {
            $(`li[data-key=${thisModuleName}] > a`).removeClass('selected');
            module.removeClass('popup-show');
          } else if (thisModuleName === moduleName) {
            $(`li[data-key=${thisModuleName}] > a`).addClass('selected');
            module.addClass('popup-show');
            if (cb) {
              cb();
            }
          }
        }
      }
    },
    setSyncStatus: (status) => {
      if (status === 'syncing') {
        syncAnimation.syncing();
      } else if (status === 'done') {
        syncAnimation.done();
      }
    },
    setEmbedLinks: () => {
      const padUrl = window.location.href.split('?')[0];
      const params = '?showControls=true&showChat=true&showLineNumbers=true&useMonospaceFont=false';
      const props = 'width="100%" height="600" frameborder="0"';

      if ($('#readonlyinput').is(':checked')) {
        const urlParts = padUrl.split('/');
        urlParts.pop();
        const readonlyLink = `${urlParts.join('/')}/${clientVars.readOnlyId}`;
        $('#embedinput')
            .val(`<iframe name="embed_readonly" src="${readonlyLink}${params}" ${props}></iframe>`);
        $('#linkinput').val(readonlyLink);
      } else {
        $('#embedinput')
            .val(`<iframe name="embed_readwrite" src="${padUrl}${params}" ${props}></iframe>`);
        $('#linkinput').val(padUrl);
      }
    },
    checkAllIconsAreDisplayedInToolbar: () => {
      // reset style
      $('.toolbar').removeClass('cropped');
      $('body').removeClass('mobile-layout');
      const menu_left = $('.toolbar .menu_left')[0];

      // this is approximate, we cannot measure it because on mobile
      // Layout it takes the full width on the bottom of the page
      const menuRightWidth = 280;
      if (menu_left && menu_left.scrollWidth > $('.toolbar').width() - menuRightWidth ||
          $('.toolbar').width() < 1000) {
        $('body').addClass('mobile-layout');
      }
      if (menu_left && menu_left.scrollWidth > $('.toolbar').width()) {
        $('.toolbar').addClass('cropped');
      }
    },
  };

  let editbarPosition = 0;

  const bodyKeyEvent = (evt) => {
    // If the event is Alt F9 or Escape & we're already in the editbar menu
    // Send the users focus back to the pad
    if ((evt.keyCode === 120 && evt.altKey) || evt.keyCode === 27) {
      if ($(':focus').parents('.toolbar').length === 1) {
        // If we're in the editbar already..
        // Close any dropdowns we have open..
        padeditbar.toggleDropDown('none');
        // Check we're on a pad and not on the timeslider
        // Or some other window I haven't thought about!
        if (typeof pad === 'undefined') {
          // Timeslider probably..
          // Shift focus away from any drop downs
          $(':focus').blur(); // required to do not try to remove!
          $('#editorcontainerbox').focus(); // Focus back onto the pad
        } else {
          // Shift focus away from any drop downs
          $(':focus').blur(); // required to do not try to remove!
          padeditor.ace.focus(); // Sends focus back to pad
          // The above focus doesn't always work in FF, you have to hit enter afterwards
          evt.preventDefault();
        }
      } else {
        // Focus on the editbar :)
        const firstEditbarElement = parent.parent.$('#editbar button').first();

        $(this).blur();
        firstEditbarElement.focus();
        evt.preventDefault();
      }
    }
    // Are we in the toolbar??
    if ($(':focus').parents('.toolbar').length === 1) {
      // On arrow keys go to next/previous button item in editbar
      if (evt.keyCode !== 39 && evt.keyCode !== 37) return;

      // Get all the focusable items in the editbar
      const focusItems = $('#editbar').find('button, select');

      // On left arrow move to next button in editbar
      if (evt.keyCode === 37) {
        // If a dropdown is visible or we're in an input don't move to the next button
        if ($('.popup').is(':visible') || evt.target.localName === 'input') return;

        editbarPosition--;
        // Allow focus to shift back to end of row and start of row
        if (editbarPosition === -1) editbarPosition = focusItems.length - 1;
        $(focusItems[editbarPosition]).focus();
      }

      // On right arrow move to next button in editbar
      if (evt.keyCode === 39) {
        // If a dropdown is visible or we're in an input don't move to the next button
        if ($('.popup').is(':visible') || evt.target.localName === 'input') return;

        editbarPosition++;
        // Allow focus to shift back to end of row and start of row
        if (editbarPosition >= focusItems.length) editbarPosition = 0;
        $(focusItems[editbarPosition]).focus();
      }
    }
  };

  const aceAttributeCommand = (cmd, ace) => {
    ace.ace_toggleAttributeOnSelection(cmd);
  };

  const registerDefaultCommands = (toolbar) => {
    toolbar.registerDropdownCommand('showusers', 'users');
    toolbar.registerDropdownCommand('settings');
    toolbar.registerDropdownCommand('connectivity');
    toolbar.registerDropdownCommand('import_export');
    toolbar.registerDropdownCommand('embed');

    toolbar.registerCommand('settings', () => {
      toolbar.toggleDropDown('settings', () => {
        $('#options-stickychat').focus();
      });
    });

    toolbar.registerCommand('import_export', () => {
      toolbar.toggleDropDown('import_export', () => {
        // If Import file input exists then focus on it..
        if ($('#importfileinput').length !== 0) {
          setTimeout(() => {
            $('#importfileinput').focus();
          }, 100);
        } else {
          $('.exportlink').first().focus();
        }
      });
    });

    toolbar.registerCommand('showusers', () => {
      toolbar.toggleDropDown('users', () => {
        $('#myusernameedit').focus();
      });
    });

    toolbar.registerCommand('embed', () => {
      toolbar.setEmbedLinks();
      toolbar.toggleDropDown('embed', () => {
        $('#linkinput').focus().select();
      });
    });

    toolbar.registerCommand('savedRevision', () => {
      padsavedrevs.saveNow();
    });

    toolbar.registerCommand('showTimeSlider', () => {
      document.location = `${document.location.pathname}/timeslider`;
    });

    toolbar.registerAceCommand('bold', aceAttributeCommand);
    toolbar.registerAceCommand('italic', aceAttributeCommand);
    toolbar.registerAceCommand('underline', aceAttributeCommand);
    toolbar.registerAceCommand('strikethrough', aceAttributeCommand);

    toolbar.registerAceCommand('undo', (cmd, ace) => {
      ace.ace_doUndoRedo(cmd);
    });

    toolbar.registerAceCommand('redo', (cmd, ace) => {
      ace.ace_doUndoRedo(cmd);
    });

    toolbar.registerAceCommand('insertunorderedlist', (cmd, ace) => {
      ace.ace_doInsertUnorderedList();
    });

    toolbar.registerAceCommand('insertorderedlist', (cmd, ace) => {
      ace.ace_doInsertOrderedList();
    });

    toolbar.registerAceCommand('indent', (cmd, ace) => {
      if (!ace.ace_doIndentOutdent(false)) {
        ace.ace_doInsertUnorderedList();
      }
    });

    toolbar.registerAceCommand('outdent', (cmd, ace) => {
      ace.ace_doIndentOutdent(true);
    });

    toolbar.registerAceCommand('clearauthorship', (cmd, ace) => {
      // If we have the whole document selected IE control A has been hit
      const rep = ace.ace_getRep();
      let doPrompt = false;
      const lastChar = rep.lines.atIndex(rep.lines.length() - 1).width - 1;
      const lastLineIndex = rep.lines.length() - 1;
      if (rep.selStart[0] === 0 && rep.selStart[1] === 0) {
        // nesting intentionally here to make things readable
        if (rep.selEnd[0] === lastLineIndex && rep.selEnd[1] === lastChar) {
          doPrompt = true;
        }
      }
      /*
      * NOTICE: This command isn't fired on Control Shift C.
      * I intentionally didn't create duplicate code because if you are hitting
      * Control Shift C we make the assumption you are a "power user"
      * and as such we assume you don't need the prompt to bug you each time!
      * This does make wonder if it's worth having a checkbox to avoid being
      * prompted again but that's probably overkill for this contribution.
      */

      // if we don't have any text selected, we have a caret or we have already said to prompt
      if ((!(rep.selStart && rep.selEnd)) || ace.ace_isCaret() || doPrompt) {
        if (window.confirm(html10n.get('pad.editbar.clearcolors'))) {
          ace.ace_performDocumentApplyAttributesToCharRange(0, ace.ace_getRep().alltext.length, [
            ['author', ''],
          ]);
        }
      } else {
        ace.ace_setAttributeOnSelection('author', '');
      }
    });

    toolbar.registerCommand('timeslider_returnToPad', (cmd) => {
      if (document.referrer.length > 0 &&
            document.referrer.substring(document.referrer.lastIndexOf('/') - 1,
                document.referrer.lastIndexOf('/')) === 'p') {
        document.location = document.referrer;
      } else {
        document.location = document.location.href
            .substring(0, document.location.href.lastIndexOf('/'));
      }
    });
  };

  return self;
}());

exports.padeditbar = padeditbar;