/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#pragma once


//==============================================================================
class ViewportHandler  : public ComponentTypeHandler
{
public:
    ViewportHandler()
        : ComponentTypeHandler ("Viewport", "juce::Viewport", typeid (UpdatingViewport), 150, 150)
    {}

    Component* createNewComponent (JucerDocument*) override
    {
        Viewport* const v = new UpdatingViewport ("new viewport");
        v->setViewedComponent (new ViewportDemoContentComp());

        return v;
    }

    XmlElement* createXmlFor (Component* comp, const ComponentLayout* layout) override
    {
        Viewport* const v = dynamic_cast<Viewport*> (comp);
        XmlElement* const e = ComponentTypeHandler::createXmlFor (comp, layout);

        e->setAttribute ("vscroll", v->isVerticalScrollBarShown());
        e->setAttribute ("hscroll", v->isHorizontalScrollBarShown());
        e->setAttribute ("scrollbarThickness", v->getScrollBarThickness());

        e->setAttribute ("contentType", getViewportContentType (v));
        e->setAttribute ("jucerFile", getViewportJucerComponentFile (v));
        e->setAttribute ("contentClass", getViewportGenericComponentClass (v));
        e->setAttribute ("constructorParams", getViewportConstructorParams (v));

        return e;
    }

    bool restoreFromXml (const XmlElement& xml, Component* comp, const ComponentLayout* layout) override
    {
        if (! ComponentTypeHandler::restoreFromXml (xml, comp, layout))
            return false;

        Viewport defaultViewport;
        Viewport* const v = dynamic_cast<Viewport*> (comp);
        v->setScrollBarsShown (xml.getBoolAttribute ("vscroll", defaultViewport.isVerticalScrollBarShown()),
                               xml.getBoolAttribute ("hscroll", defaultViewport.isHorizontalScrollBarShown()));

        v->setScrollBarThickness (xml.getIntAttribute ("scrollbarThickness", defaultViewport.getScrollBarThickness()));

        setViewportJucerComponentFile (v, xml.getStringAttribute ("jucerFile", String()));
        setViewportGenericComponentClass (v, xml.getStringAttribute ("contentClass"));
        setViewportContentType (v, xml.getIntAttribute ("contentType", 0));
        setViewportConstructorParams (v, xml.getStringAttribute ("constructorParams"));

        return true;
    }

    void getEditableProperties (Component* component, JucerDocument& document,
                                Array<PropertyComponent*>& props, bool multipleSelected) override
    {
        ComponentTypeHandler::getEditableProperties (component, document, props, multipleSelected);

        if (multipleSelected)
            return;

        auto* v = dynamic_cast<Viewport*> (component);

        props.add (new ViewportScrollbarShownProperty (v, document, true));
        props.add (new ViewportScrollbarShownProperty (v, document, false));
        props.add (new ViewportScrollbarSizeProperty (v, document));
        props.add (new ViewportContentTypeProperty (v, document));

        if (getViewportContentType (v) == 1)
        {
            props.add (new ViewportJucerFileProperty (v, document));
            props.add (new ConstructorParamsProperty (v, document));
        }
        else if (getViewportContentType (v) == 2)
        {
            props.add (new ViewportContentClassProperty (v, document));
            props.add (new ConstructorParamsProperty (v, document));
        }
    }

    String getCreationParameters (GeneratedCode&, Component* comp) override
    {
        return quotedString (comp->getName(), false);
    }

    void fillInCreationCode (GeneratedCode& code, Component* component, const String& memberVariableName) override
    {
        Viewport defaultViewport;
        Viewport* const v = dynamic_cast<Viewport*> (component);

        ComponentTypeHandler::fillInCreationCode (code, component, memberVariableName);

        if (defaultViewport.isVerticalScrollBarShown() != v->isVerticalScrollBarShown()
             || defaultViewport.isHorizontalScrollBarShown() != v->isHorizontalScrollBarShown())
        {
            code.constructorCode
                << memberVariableName << "->setScrollBarsShown ("
                << CodeHelpers::boolLiteral (v->isVerticalScrollBarShown()) << ", "
                << CodeHelpers::boolLiteral (v->isHorizontalScrollBarShown()) << ");\n";
        }

        if (defaultViewport.getScrollBarThickness() != v->getScrollBarThickness())
        {
            code.constructorCode
                << memberVariableName << "->setScrollBarThickness ("
                << v->getScrollBarThickness() << ");\n";
        }

        if (getViewportContentType (v) != 0)
        {
            String classNm (getViewportGenericComponentClass (v));

            if (getViewportContentType (v) == 1)
            {
                File file;

                const String filename (getViewportJucerComponentFile (v));

                if (filename.isNotEmpty())
                    file = code.document->getCppFile().getSiblingFile (filename);

                std::unique_ptr<JucerDocument> doc (JucerDocument::createForCppFile (nullptr, file));

                if (doc != nullptr)
                {
                    code.includeFilesCPP.add (File::createFileWithoutCheckingPath (doc->getHeaderFile()
                                                                                       .getRelativePathFrom (code.document->getCppFile().getParentDirectory())
                                                                                       .replaceCharacter ('\\', '/')));
                    classNm = doc->getClassName();
                }
                else
                {
                    classNm = String();
                }
            }

            if (classNm.isNotEmpty())
            {
                code.constructorCode
                    << memberVariableName << "->setViewedComponent (new "
                    << classNm;

                if (getViewportConstructorParams (v).trim().isNotEmpty())
                {
                    code.constructorCode << " (" << getViewportConstructorParams (v).trim() << "));\n";
                }
                else
                {
                    code.constructorCode << "());\n";
                }
            }
        }

        code.constructorCode << "\n";
    }

    static void updateViewportContentComp (Viewport* vp)
    {
        if (getViewportContentType (vp) == 1)
        {
            JucerDocument* doc = findParentDocument (vp);
            auto tc = new TestComponent (doc, nullptr, false);

            tc->setFilename (getViewportJucerComponentFile (vp));
            tc->setToInitialSize();

            vp->setViewedComponent (tc);
        }
        else
        {
            vp->setViewedComponent (new ViewportDemoContentComp());
        }
    }

    static int getViewportContentType (Viewport* vp)
    {
        return vp->getProperties() ["contentType"];
    }

    static void setViewportContentType (Viewport* vp, int newValue)
    {
        if (newValue != getViewportContentType (vp))
        {
            vp->getProperties().set ("contentType", newValue);
            updateViewportContentComp (vp);
        }
    }

    static String getViewportJucerComponentFile (Viewport* vp)
    {
        return vp->getProperties() ["jucerFile"].toString();
    }

    static void setViewportJucerComponentFile (Viewport* vp, const String& file)
    {
        if (file != getViewportJucerComponentFile (vp))
        {
            vp->getProperties().set ("jucerFile", file);
            updateViewportContentComp (vp);
        }
    }

    static String getViewportGenericComponentClass (Viewport* vp)
    {
        return vp->getProperties() ["contentClass"].toString();
    }

    static void setViewportGenericComponentClass (Viewport* vp, const String& name)
    {
        if (name != getViewportGenericComponentClass (vp))
        {
            vp->getProperties().set ("contentClass", name);
            updateViewportContentComp (vp);
        }
    }

    static String getViewportConstructorParams (Viewport* vp)
    {
        return vp->getProperties() ["constructorParams"].toString();
    }

    static void setViewportConstructorParams (Viewport* vp, const String& newParams)
    {
        if (newParams != getViewportConstructorParams (vp))
        {
            vp->getProperties().set ("constructorParams", newParams);
            updateViewportContentComp (vp);
        }
    }

private:
    //==============================================================================
    class UpdatingViewport  : public Viewport
    {
    public:
        UpdatingViewport (const String& name)
            : Viewport (name)
        {
        }

        void parentHierarchyChanged()
        {
            Viewport::parentHierarchyChanged();
            updateViewportContentComp (this);
        }
    };

    //==============================================================================
    struct ViewportDemoContentComp : public Component
    {
        ViewportDemoContentComp()
        {
            setSize (2048, 2048);
        }

        void paint (Graphics& g) override
        {
            g.fillCheckerBoard (getLocalBounds().toFloat(), 50.0f, 50.0f,
                                Colours::lightgrey.withAlpha (0.5f),
                                Colours::darkgrey.withAlpha (0.5f));
        }
    };

    //==============================================================================
    class ViewportScrollbarShownProperty  : public ComponentBooleanProperty <Viewport>
    {
    public:
        ViewportScrollbarShownProperty (Viewport* comp, JucerDocument& doc, const bool vertical_)
            : ComponentBooleanProperty <Viewport> (vertical_ ? "V scrollbar" : "H scrollbar",
                                                   "enabled", "enabled",
                                                   comp, doc),
               vertical (vertical_)
        {
        }

        void setState (bool newState)
        {
            document.perform (new ViewportScrollbarChangeAction (component, *document.getComponentLayout(), vertical, newState),
                              "Change Viewport scrollbar");
        }

        bool getState() const
        {
            return vertical ? component->isVerticalScrollBarShown()
                            : component->isHorizontalScrollBarShown();
        }

        const bool vertical;

    private:
        class ViewportScrollbarChangeAction  : public ComponentUndoableAction <Viewport>
        {
        public:
            ViewportScrollbarChangeAction (Viewport* const comp, ComponentLayout& l, const bool vertical_, const bool newState_)
                : ComponentUndoableAction <Viewport> (comp, l),
                  vertical (vertical_),
                  newState (newState_)
            {
                oldState = vertical ? comp->isVerticalScrollBarShown()
                                    : comp->isHorizontalScrollBarShown();
            }

            bool perform()
            {
                showCorrectTab();
                if (vertical)
                    getComponent()->setScrollBarsShown (newState, getComponent()->isHorizontalScrollBarShown());
                else
                    getComponent()->setScrollBarsShown (getComponent()->isVerticalScrollBarShown(), newState);

                changed();
                return true;
            }

            bool undo()
            {
                showCorrectTab();
                if (vertical)
                    getComponent()->setScrollBarsShown (oldState, getComponent()->isHorizontalScrollBarShown());
                else
                    getComponent()->setScrollBarsShown (getComponent()->isVerticalScrollBarShown(), oldState);

                changed();
                return true;
            }

            bool vertical, newState, oldState;
        };
    };

    //==============================================================================
    class ViewportScrollbarSizeProperty  : public SliderPropertyComponent,
                                           public ChangeListener
    {
    public:
        ViewportScrollbarSizeProperty (Viewport* comp, JucerDocument& doc)
            : SliderPropertyComponent ("scrollbar size", 3.0, 30.0, 1.0, 1.0),
              component (comp),
              document (doc)
        {
            document.addChangeListener (this);
        }

        ~ViewportScrollbarSizeProperty()
        {
            document.removeChangeListener (this);
        }

        void setValue (double newValue)
        {
            document.getUndoManager().undoCurrentTransactionOnly();

            document.perform (new ViewportScrollbarSizeChangeAction (component, *document.getComponentLayout(), roundToInt (newValue)),
                              "Change Viewport scrollbar size");
        }

        double getValue() const
        {
            return component->getScrollBarThickness();
        }

        void changeListenerCallback (ChangeBroadcaster*)
        {
            refresh();
        }

        Viewport* component;
        JucerDocument& document;

    private:
        class ViewportScrollbarSizeChangeAction  : public ComponentUndoableAction <Viewport>
        {
        public:
            ViewportScrollbarSizeChangeAction (Viewport* const comp, ComponentLayout& l, const int newState_)
                : ComponentUndoableAction <Viewport> (comp, l),
                  newState (newState_)
            {
                oldState = comp->getScrollBarThickness();
            }

            bool perform()
            {
                showCorrectTab();
                getComponent()->setScrollBarThickness (newState);
                changed();
                return true;
            }

            bool undo()
            {
                showCorrectTab();
                getComponent()->setScrollBarThickness (newState);
                changed();
                return true;
            }

            int newState, oldState;
        };
    };

    //==============================================================================
    class ViewportContentTypeProperty  : public ComponentChoiceProperty <Viewport>
    {
    public:
        ViewportContentTypeProperty (Viewport* comp, JucerDocument& doc)
            : ComponentChoiceProperty <Viewport> ("content", comp, doc)
        {
            choices.add ("No content component");
            choices.add ("Jucer content component");
            choices.add ("Named content component");
        }

        void setIndex (int newIndex)
        {
            document.perform (new ViewportContentTypeChangeAction (component, *document.getComponentLayout(), newIndex),
                              "Change Viewport content type");
        }

        int getIndex() const
        {
            return getViewportContentType (component);
        }

    private:
        class ViewportContentTypeChangeAction  : public ComponentUndoableAction <Viewport>
        {
        public:
            ViewportContentTypeChangeAction (Viewport* const comp, ComponentLayout& l, const int newValue_)
                : ComponentUndoableAction <Viewport> (comp, l),
                  newValue (newValue_)
            {
                oldValue = getViewportContentType (comp);
            }

            bool perform()
            {
                showCorrectTab();
                setViewportContentType (getComponent(), newValue);
                changed();
                layout.getDocument()->refreshAllPropertyComps();
                return true;
            }

            bool undo()
            {
                showCorrectTab();
                setViewportContentType (getComponent(), oldValue);
                changed();
                layout.getDocument()->refreshAllPropertyComps();
                return true;
            }

            int newValue, oldValue;
        };
    };

    //==============================================================================
    class ViewportJucerFileProperty   : public FilePropertyComponent,
                                        public ChangeListener
    {
    public:
        ViewportJucerFileProperty (Viewport* const comp, JucerDocument& doc)
            : FilePropertyComponent ("Jucer file", false, true),
              component (comp),
              document (doc)
        {
            document.addChangeListener (this);
        }

        ~ViewportJucerFileProperty()
        {
            document.removeChangeListener (this);
        }

        void setFile (const File& newFile)
        {
            document.perform (new JucerCompFileChangeAction (component, *document.getComponentLayout(),
                                                             newFile.getRelativePathFrom (document.getCppFile().getParentDirectory())
                                                                    .replaceCharacter ('\\', '/')),
                              "Change Projucer component file");
        }

        File getFile() const
        {
            auto filename = getViewportJucerComponentFile (component);

            if (filename.isEmpty())
                return {};

            return document.getCppFile().getSiblingFile (filename);
        }

        void changeListenerCallback (ChangeBroadcaster*)
        {
            refresh();
        }

    private:
        Viewport* const component;
        JucerDocument& document;

        class JucerCompFileChangeAction  : public ComponentUndoableAction <Viewport>
        {
        public:
            JucerCompFileChangeAction (Viewport* const comp, ComponentLayout& l, const String& newState_)
                : ComponentUndoableAction <Viewport> (comp, l),
                  newState (newState_)
            {
                oldState = getViewportJucerComponentFile (comp);
            }

            bool perform()
            {
                showCorrectTab();
                setViewportJucerComponentFile (getComponent(), newState);
                changed();
                return true;
            }

            bool undo()
            {
                showCorrectTab();
                setViewportJucerComponentFile (getComponent(), oldState);
                changed();
                return true;
            }

            String newState, oldState;
        };
    };

    //==============================================================================
    class ViewportContentClassProperty   : public ComponentTextProperty <Viewport>
    {
    public:
        ViewportContentClassProperty (Viewport* comp, JucerDocument& doc)
            : ComponentTextProperty <Viewport> ("content class", 256, false, comp, doc)
        {
        }

        void setText (const String& newText) override
        {
            document.perform (new ViewportClassNameChangeAction (component, *document.getComponentLayout(), newText),
                              "Change Viewport content class");
        }

        String getText() const override
        {
            return getViewportGenericComponentClass (component);
        }

    private:
        class ViewportClassNameChangeAction  : public ComponentUndoableAction <Viewport>
        {
        public:
            ViewportClassNameChangeAction (Viewport* const comp, ComponentLayout& l, const String& newValue_)
                : ComponentUndoableAction <Viewport> (comp, l),
                  newValue (newValue_)
            {
                oldValue = getViewportGenericComponentClass (comp);
            }

            bool perform()
            {
                showCorrectTab();
                setViewportGenericComponentClass (getComponent(), newValue);
                changed();
                layout.getDocument()->refreshAllPropertyComps();
                return true;
            }

            bool undo()
            {
                showCorrectTab();
                setViewportGenericComponentClass (getComponent(), oldValue);
                changed();
                layout.getDocument()->refreshAllPropertyComps();
                return true;
            }

            String newValue, oldValue;
        };
    };

    //==============================================================================
    class ConstructorParamsProperty   : public ComponentTextProperty <Viewport>
    {
    public:
        ConstructorParamsProperty (Viewport* comp, JucerDocument& doc)
            : ComponentTextProperty <Viewport> ("constructor params", 512, false, comp, doc)
        {
        }

        void setText (const String& newText) override
        {
            document.perform (new ConstructorParamChangeAction (component, *document.getComponentLayout(), newText),
                              "Change Viewport content constructor params");
        }

        String getText() const override
        {
            return getViewportConstructorParams (component);
        }

    private:
        class ConstructorParamChangeAction  : public ComponentUndoableAction <Viewport>
        {
        public:
            ConstructorParamChangeAction (Viewport* const comp, ComponentLayout& l, const String& newValue_)
                : ComponentUndoableAction <Viewport> (comp, l),
                  newValue (newValue_)
            {
                oldValue = getViewportConstructorParams (comp);
            }

            bool perform()
            {
                showCorrectTab();
                setViewportConstructorParams (getComponent(), newValue);
                changed();
                layout.getDocument()->refreshAllPropertyComps();
                return true;
            }

            bool undo()
            {
                showCorrectTab();
                setViewportConstructorParams (getComponent(), oldValue);
                changed();
                layout.getDocument()->refreshAllPropertyComps();
                return true;
            }

            String newValue, oldValue;
        };
    };
};