class ClassPage {

  static ModeCookieName = 'doczilla-js-docs-class-page-mode';

  static Mode = {
    Tabs: 'mode-tabs',
    List: 'mode-list'
  };

  static StyleClasses = {
    Selected: 'selected',
    Active: 'active',
    CtrlPressed: 'ctrl-pressed',
    ParentsBranch: 'parents-branch',
    ClassItem: 'class-item',
    ClassName: 'class-name',
    ClassIcon: 'class-icon',
    Filler: 'filler',
    FullSourcePrompt: 'full-source-prompt',
    FullSourcePromptText: 'full-source-prompt-text',
    FullSourcePromptButton: 'full-source-prompt-button',
    Spacing: 'spacing',
    CmLink: 'cm-link',
    Hidden: 'hidden'
  };

  static Attributes = {
    DataTab: 'data-tab',
    DataDisplayMode: 'data-display-mode',
    DataClassName: 'data-class-name',
    OnClick: 'onclick'
  };

  static Messages = {
    NoMixins: 'This class has no mixins.',
    NoChildren: 'This class has no child classes.',
    NoMixedIn: 'This class is not mixed in any classes.',
    NoParents: 'This is a base class, which has no parent classes.',
    ShowFullSourceText: 'There were found another entities in the source file of this class. Would you like to see full source file?',
    HideFullSourceText: 'Full source file shown. Would you like to hide all entities except the target class?',
    PromptButtonText: 'OK',
    CmLinkTipPrefix: 'Ctrl+Click to go to class'
  };

	start() {
    const tabElements = this.tabElements = {
      Editor:     DOM.get('.tab.editor'),
      Methods:    DOM.get('.tab.methods'),
      Parents:    DOM.get('.tab.parents'),
      Properties: DOM.get('.tab.properties'),
      Mixins:     DOM.get('.tab.mixins'),
      Children:   DOM.get('.tab.children'),
      MixedIn:    DOM.get('.tab.mixedin')
    };
    
    const contentElements = this.contentElements = {
      Editor:     DOM.get('.content-tab#editor'),
      Methods:    DOM.get('.content-tab#methods'),
      Parents:    DOM.get('.content-tab#parents'),
      Properties: DOM.get('.content-tab#properties'),
      Mixins:     DOM.get('.content-tab#mixins'),
      Children:   DOM.get('.content-tab#children'),
      MixedIn:    DOM.get('.content-tab#mixedin')
    };

    const rightContainer = this.rightContainer = DOM.get('.right');

    const selectedTab = this.selectedTab = tabElements[Url.getHash()] || tabElements.Editor;
    const activeContent = this.activeContent = contentElements[Url.getHash()] || contentElements.Editor;

    const modeCookieValue = DOM.getCookieProperty(App.CookieName, ClassPage.ModeCookieName);
    
    if(!modeCookieValue)
      DOM.setCookieProperty(App.CookieName, ClassPage.ModeCookieName, ClassPage.Mode.Tabs);

    const mode = this.mode = modeCookieValue || ClassPage.Mode.Tabs;
    const tabsModeButton = this.tabsModeButton = DOM.get('.display-mode-button.mode-tabs');
    const listModeButton = this.listModeButton = DOM.get('.display-mode-button.mode-list');

    (mode === ClassPage.Mode.Tabs ? tabsModeButton : listModeButton).addClass(ClassPage.StyleClasses.Selected);

    rightContainer.addClass(mode);

    this.renderContent();

    this.selectTab(selectedTab);
    this.activateContent(activeContent);

		this.codeMirrorEditor.eachLine((lineHandle) => {
			this.markExtend(lineHandle);
			this.markMixins(lineHandle);
		});

    this.registerEventListeners();

		return this;
	}

  switchMode(mode) {
    this.rightContainer.removeClass(this.mode);

    this.mode = mode;
    DOM.setCookieProperty(App.CookieName, ClassPage.ModeCookieName, mode);

    this.rightContainer.addClass(mode);

    this.codeMirrorEditor.refresh();
  }

  selectTab(tab) {
    tab = typeof tab === 'string' ? this.tabElements[tab] : tab;
    const selectedTab = this.selectedTab;
    let filler = selectedTab.getFirstChild('.filler');
    if(!filler)
      filler = DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.Filler });
    selectedTab.removeClass(ClassPage.StyleClasses.Selected);
    this.selectedTab = tab.addClass(ClassPage.StyleClasses.Selected);
    this.selectedTab.append(filler);
  }

  activateContent(content) {
    content = typeof content === 'string' ? this.contentElements[content] : content;
    this.activeContent.removeClass(ClassPage.StyleClasses.Active);
    this.activeContent = content.addClass(ClassPage.StyleClasses.Active);
    if(content === this.contentElements.Editor)
      this.codeMirrorEditor.refresh();
  }

  registerEventListeners() {
    this.registerTabsEventListeners();
    this.registerModeButtonsEventListeners();
  }

  registerTabsEventListeners() {
    const tabElements = this.tabElements;
    for(const tabName of Object.keys(tabElements)) {
      tabElements[tabName].on(DOM.Events.Click, this.onTabClick.bind(this));
    }
  }

  registerModeButtonsEventListeners() {
    this.tabsModeButton.on(DOM.Events.Click, this.onModeButtonClick.bind(this));
    this.listModeButton.on(DOM.Events.Click, this.onModeButtonClick.bind(this));
  }

  prepareSource() {
    const className = Class.name.replaceAll('.', '\\.');
    const classRx = new RegExp(`Z8\\.define\\(\'${className}\',\\s*\\{(?:.|[\r\n])+?^\\}\\);?`, 'gm');
    const classSource = this.classSource = ClassSource.match(classRx)[0];
    this.sourceHasAnotherEntities = ClassSource.trim() !== classSource;
    return classSource;
  }

  renderContent() {
    this.renderEditor();
    this.renderParents();
    this.renderMixins();
    this.renderChildren();
    this.renderMixedIn();
  }

  renderEditor() {
    this.codeMirrorEditor = CodeMirror(DOM.get('#editor').get(), {
			value:	      this.prepareSource(ClassSource),
			mode:         'javascript',
			theme:        'darcula',
			readOnly:     true,
			lineNumbers:  true,
			matchBrackets: true,
			scrollbarStyle: 'overlay'
		});

    if(this.sourceHasAnotherEntities)
      this.renderFullSourcePrompt();

		this.codeMirrorEditorElement = DOM.get('.CodeMirror');
  }

  renderMixins() {
    const mixinsElement = this.contentElements.Mixins;

    if(Class.mixins.length == 0) {
      DOM.create({ tag: DOM.Tags.Div, style: 'font-size: 24px;', innerHTML: ClassPage.Messages.NoMixins }, mixinsElement);
      return;
    }

    this.renderClassItems(Class.mixins, mixinsElement);
  }

  renderChildren() {
    const childrenElement = this.contentElements.Children;
    if(Class.children.length == 0) {
      DOM.create({ tag: DOM.Tags.Div, style: 'font-size: 24px;', innerHTML: ClassPage.Messages.NoChildren }, childrenElement);
      return;
    }

    this.renderClassItems(Class.children, childrenElement);
  }

  renderMixedIn() {
    const mixedInElement = this.contentElements.MixedIn;
    if(Class.mixedIn.length == 0) {
      DOM.create({ tag: DOM.Tags.Div, style: 'font-size: 24px;', innerHTML: ClassPage.Messages.NoMixedIn }, mixedInElement);
      return;
    }

    this.renderClassItems(Class.mixedIn, mixedInElement);
  }

  renderFullSourcePrompt() {
    const editorContent = this.contentElements.Editor;

    const prompt = DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.FullSourcePrompt }, editorContent);
    const text = DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.FullSourcePromptText, innerHTML: ClassPage.Messages.ShowFullSourceText }, prompt);
    const button = DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.FullSourcePromptButton, innerHTML: ClassPage.Messages.PromptButtonText }, prompt);

    const onButtonClick = (e) => {
      text.setInnerHTML(this.switchFullSource() ? ClassPage.Messages.HideFullSourceText : ClassPage.Messages.ShowFullSourceText);
    };

    button.on(DOM.Events.Click, onButtonClick.bind(this));
  }

  switchFullSource() {
    const show = this.fullSourceCodeShown = !this.fullSourceCodeShown;
    this.codeMirrorEditor.setValue(show ? ClassSource : this.classSource);
    if(show)
      this.findAndScrollToTargetClass();
    this.codeMirrorEditor.refresh();
    return show;
  }

  findAndScrollToTargetClass() {
    const className = Class.name.replaceAll('.', '\\.');
    const editor = this.codeMirrorEditor;
    const defineRx = new RegExp(`Z8\\.define\\(\'${className}\',`);
    editor.eachLine((lineHandle) => {
      const text = lineHandle.text;
		  const match = text.match(defineRx);
      if(match) {
        editor.scrollIntoView({ line: lineHandle.lineNo(), ch: 0 });
        return;
      }
    });
  }

  renderParents() {
    const parentsContent = this.contentElements.Parents;

    const parentsContainer = DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.ParentsBranch }, parentsContent);

    if(Class.parentsBranch.length == 0) {
      DOM.create({ tag: DOM.Tags.Div, style: 'font-size: 24px;', innerHTML: ClassPage.Messages.NoParents }, parentsContent);
      return;
    }

    this.renderClassItems(Class.parentsBranch, parentsContainer, true);
  }

  renderClassItems(itemsList, container, withIndent) {
    let indent = 0;

    if(!withIndent)
      itemsList = itemsList.sort((a, b) => a.toLowerCase().localeCompare(b.toLowerCase()));

    for(const cls of itemsList) {
      const icon = DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.ClassIcon });
      const name = DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.ClassName, innerHTML: cls });
      const cn = [icon, name];

      if(indent > 0 && withIndent)
        cn.unshift(DOM.create({ tag: DOM.Tags.Div, cls: ClassPage.StyleClasses.Spacing, style: `width: ${10 * indent}px;` }));

      DOM.create({ tag: DOM.Tags.Div, cls: `${ClassPage.StyleClasses.ClassItem}${ withIndent ? ' indent' : '' }`, attr: { [ClassPage.Attributes.DataClassName]: cls }, cn: cn }, container).on(DOM.Events.Click, this.onClassClick.bind(this));
      indent++;
    }
  }

	markExtend(lineHandle) {
		const editor = this.codeMirrorEditor;
		const text = lineHandle.text;
		const match = text.match(/extend:\s*['"]?([\w\.]+)['"]?/);
		if (match) {
			const className = match[1];
			const from = { line: lineHandle.lineNo(), ch: match.index + 8 };
			const to = { line: lineHandle.lineNo(), ch: match.index + match[0].length };
			editor.markText(from, to, {
				className: ClassPage.StyleClasses.CmLink,
				title: `${ClassPage.Messages.CmLinkTipPrefix} ${className}`,
				attributes: {
					[ClassPage.Attributes.DataClassName]: className,
					[ClassPage.Attributes.OnClick]: 'window.page.onClassLinkClick(this);'
				}
			});
		}
	}

	markMixins(lineHandle) {
		const editor = this.codeMirrorEditor;
		const text = lineHandle.text;
		const match = text.match(/mixins:\s*(\[.*?\]|\w+)/);
		if (match) {
			let mixins = match[1].replace(/\[|\]/g, "").split(/\s*,\s*/);
			const mixinsStr = match[1].replace(/\[|\]/g, "");
			mixins = mixinsStr.split(/\s*,\s*/);
			const startIndex = match.index + match[0].indexOf(mixinsStr);
			for (var i = 0; i < mixins.length; i++) {
				const className = mixins[i].trim().replace(/^['"]|['"]$/g, "");
				const classIndex = mixinsStr.indexOf(className);
				const from = { line: lineHandle.lineNo(), ch: startIndex + classIndex };
				const to = { line: lineHandle.lineNo(), ch: startIndex + classIndex + className.length };
				editor.markText(from, to, {
					className: ClassPage.StyleClasses.CmLink,
					title: `${ClassPage.Messages.CmLinkTipPrefix} ${className}`,
					attributes: {
						[ClassPage.Attributes.DataClassName]: className,
						[ClassPage.Attributes.OnClick]: 'window.page.onClassLinkClick(this);'
					}
				});
			}
		}
	}

	onClassLinkClick(fragment) {
			if(this.codeMirrorEditorElement.hasClass(ClassPage.StyleClasses.CtrlPressed))
				Url.goTo(`/class/${fragment.getAttribute(ClassPage.Attributes.DataClassName)}`);
	}

  onTabClick(e) {
    const element = CDElement.get(e.target);
    if(element.hasClass(ClassPage.StyleClasses.Selected))
      return;
    const tabName = element.getAttribute(ClassPage.Attributes.DataTab);
    this.selectTab(tabName);
    this.activateContent(tabName);
    Url.setHash(tabName).updateLocation();
  }

  onClassClick(e) {
    let element = CDElement.get(e.target);
    while(!element.hasClass(ClassPage.StyleClasses.ClassItem))
      element = element.getParent();
    Url.goTo(`/class/${element.getAttribute(ClassPage.Attributes.DataClassName)}`);
  }

  onModeButtonClick(e) {
    const button = CDElement.get(e.target);
    const mode = button.getAttribute(ClassPage.Attributes.DataDisplayMode);
    this.switchMode(mode);
    button.addClass(ClassPage.StyleClasses.Selected);
    (mode === ClassPage.Mode.Tabs ? this.listModeButton : this.tabsModeButton).removeClass(ClassPage.StyleClasses.Selected);
  }
};

window_.on(DOM.Events.Load, (e) => {
	window.page = new ClassPage().start();
});

window_.on(DOM.Events.KeyDown, (e) => {
	if(window.page && e.key === 'Control')
		window.page.codeMirrorEditorElement.addClass(ClassPage.StyleClasses.CtrlPressed);
});

window_.on(DOM.Events.KeyUp, (e) => {
	if(window.page && e.key === 'Control')
		window.page.codeMirrorEditorElement.removeClass(ClassPage.StyleClasses.CtrlPressed);
});