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

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

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

   For the technical preview this file cannot be licensed commercially.

   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 ConcertinaHeader    : public Component,
                            public ChangeBroadcaster
{
public:
    ConcertinaHeader (String n, Path p)
        : Component (n), name (n), iconPath (p)
    {
        setTitle (getName());

        panelIcon = Icon (iconPath, Colours::white);

        nameLabel.setText (name, dontSendNotification);
        nameLabel.setJustificationType (Justification::centredLeft);
        nameLabel.setInterceptsMouseClicks (false, false);
        nameLabel.setAccessible (false);
        nameLabel.setColour (Label::textColourId, Colours::white);

        addAndMakeVisible (nameLabel);
    }

    void resized() override
    {
        auto b = getLocalBounds().toFloat();

        iconBounds = b.removeFromLeft (b.getHeight()).reduced (7, 7);
        arrowBounds = b.removeFromRight (b.getHeight());
        nameLabel.setBounds (b.toNearestInt());
    }

    void paint (Graphics& g) override
    {
        g.setColour (findColour (defaultButtonBackgroundColourId));
        g.fillRoundedRectangle (getLocalBounds().reduced (2, 3).toFloat(), 2.0f);

        g.setColour (Colours::white);
        g.fillPath (ProjucerLookAndFeel::getArrowPath (arrowBounds,
                                                       getParentComponent()->getBoundsInParent().getY() == yPosition ? 2 : 0,
                                                       true, Justification::centred));

        panelIcon.draw (g, iconBounds.toFloat(), false);
    }

    void mouseUp (const MouseEvent& e) override
    {
        if (! e.mouseWasDraggedSinceMouseDown())
            sendChangeMessage();
    }

    std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
    {
        return std::make_unique<AccessibilityHandler> (*this,
                                                       AccessibilityRole::button,
                                                       AccessibilityActions().addAction (AccessibilityActionType::press,
                                                                                         [this] { sendChangeMessage(); }));
    }

    int direction = 0;
    int yPosition = 0;

private:
    String name;
    Label nameLabel;

    Path iconPath;
    Icon panelIcon;

    Rectangle<float> arrowBounds, iconBounds;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ConcertinaHeader)
};

//==============================================================================
class FindPanel    : public Component,
                     private Timer,
                     private FocusChangeListener
{
public:
    FindPanel (std::function<void (const String&)> cb)
        : callback (cb)
    {
        addAndMakeVisible (editor);
        editor.onTextChange = [this] { startTimer (250); };
        editor.onFocusLost  = [this]
        {
            isFocused = false;
            repaint();
        };

        Desktop::getInstance().addFocusChangeListener (this);

        lookAndFeelChanged();
    }

    ~FindPanel() override
    {
        Desktop::getInstance().removeFocusChangeListener (this);
    }

    void paintOverChildren (Graphics& g) override
    {
        if (! isFocused)
            return;

        g.setColour (findColour (defaultHighlightColourId));

        Path p;
        p.addRoundedRectangle (getLocalBounds().reduced (2), 3.0f);
        g.strokePath (p, PathStrokeType (2.0f));
    }


    void resized() override
    {
        editor.setBounds (getLocalBounds().reduced (2));
    }

private:
    TextEditor editor;
    bool isFocused = false;
    std::function<void (const String&)> callback;

    //==============================================================================
    void lookAndFeelChanged() override
    {
        editor.setTextToShowWhenEmpty ("Filter...", findColour (widgetTextColourId).withAlpha (0.3f));
    }

    void globalFocusChanged (Component* focusedComponent) override
    {
        if (focusedComponent == &editor)
        {
            isFocused = true;
            repaint();
        }
    }

    void timerCallback() override
    {
        stopTimer();
        callback (editor.getText());
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (FindPanel)
};

//==============================================================================
class ConcertinaTreeComponent    : public Component
{
public:
    class AdditionalComponents
    {
    public:
        enum Type
        {
            addButton      = (1 << 0),
            settingsButton = (1 << 1),
            findPanel      = (1 << 2)
        };

        JUCE_NODISCARD AdditionalComponents with (Type t)
        {
            auto copy = *this;
            copy.componentTypes |= t;

            return copy;
        }

        bool has (Type t) const noexcept
        {
            return (componentTypes & t) != 0;
        }

    private:
        int componentTypes = 0;
    };

    ConcertinaTreeComponent (const String& name,
                             TreePanelBase* tree,
                             AdditionalComponents additionalComponents)
         : Component (name),
           treeToDisplay (tree)
    {
        setTitle (getName());
        setFocusContainerType (FocusContainerType::focusContainer);

        if (additionalComponents.has (AdditionalComponents::addButton))
        {
            addButton = std::make_unique<IconButton> ("Add", getIcons().plus);
            addAndMakeVisible (addButton.get());
            addButton->onClick = [this] { showAddMenu(); };
        }

        if (additionalComponents.has (AdditionalComponents::settingsButton))
        {
            settingsButton = std::make_unique<IconButton> ("Settings", getIcons().settings);
            addAndMakeVisible (settingsButton.get());
            settingsButton->onClick = [this] { showSettings(); };
        }

        if (additionalComponents.has (AdditionalComponents::findPanel))
        {
            findPanel = std::make_unique<FindPanel> ([this] (const String& filter) { treeToDisplay->rootItem->setSearchFilter (filter); });
            addAndMakeVisible (findPanel.get());
        }

        addAndMakeVisible (treeToDisplay.get());
    }

    void resized() override
    {
        auto bounds = getLocalBounds();

        if (addButton != nullptr || settingsButton != nullptr || findPanel != nullptr)
        {
            auto bottomSlice = bounds.removeFromBottom (25);
            bottomSlice.removeFromRight (3);

            if (addButton != nullptr)
                addButton->setBounds (bottomSlice.removeFromRight (25).reduced (2));

            if (settingsButton != nullptr)
                settingsButton->setBounds (bottomSlice.removeFromRight (25).reduced (2));

            if (findPanel != nullptr)
                findPanel->setBounds (bottomSlice.reduced (2));
        }

        treeToDisplay->setBounds (bounds);
    }

    TreePanelBase* getTree() const noexcept    { return treeToDisplay.get(); }

private:
    std::unique_ptr<TreePanelBase> treeToDisplay;
    std::unique_ptr<IconButton> addButton, settingsButton;
    std::unique_ptr<FindPanel> findPanel;

    void showAddMenu()
    {
        auto numSelected = treeToDisplay->tree.getNumSelectedItems();

        if (numSelected > 1)
            return;

        if (numSelected == 0)
        {
            if (auto* root = dynamic_cast<JucerTreeViewBase*> (treeToDisplay->tree.getRootItem()))
                root->showPopupMenu (addButton->getScreenBounds().getCentre());
        }
        else
        {
            if (auto* item = dynamic_cast<JucerTreeViewBase*> (treeToDisplay->tree.getSelectedItem (0)))
                item->showAddMenu (addButton->getScreenBounds().getCentre());
        }
    }

    void showSettings()
    {
        if (auto* root = dynamic_cast<JucerTreeViewBase*> (treeToDisplay->tree.getRootItem()))
        {
            treeToDisplay->tree.clearSelectedItems();
            root->showDocument();
        }
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ConcertinaTreeComponent)
};


//==============================================================================
struct ProjectSettingsComponent  : public Component,
                                   private ChangeListener
{
    ProjectSettingsComponent (Project& p)
        : project (p),
          group (project.getProjectFilenameRootString(),
                 Icon (getIcons().settings, Colours::transparentBlack))
    {
        setTitle ("Project Settings");
        setFocusContainerType (FocusContainerType::focusContainer);

        addAndMakeVisible (group);

        updatePropertyList();
        project.addChangeListener (this);
    }

    ~ProjectSettingsComponent() override
    {
        project.removeChangeListener (this);
    }

    void resized() override
    {
        group.updateSize (12, 0, getWidth() - 24);
        group.setBounds (getLocalBounds().reduced (12, 0));
    }

    void updatePropertyList()
    {
        PropertyListBuilder props;
        project.createPropertyEditors (props);
        group.setProperties (props);
        group.setName ("Project Settings");

        lastProjectType = project.getProjectTypeString();
        parentSizeChanged();
    }

    void changeListenerCallback (ChangeBroadcaster*) override
    {
        if (lastProjectType != project.getProjectTypeString())
            updatePropertyList();
    }

    void parentSizeChanged() override
    {
        auto width = jmax (550, getParentWidth());
        auto y = group.updateSize (12, 0, width - 12);

        y = jmax (getParentHeight(), y);

        setSize (width, y);
    }

    Project& project;
    var lastProjectType;
    PropertyGroupComponent group;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ProjectSettingsComponent)
};

//==============================================================================
struct FileTreePanel   : public TreePanelBase
{
    FileTreePanel (Project& p)
        : TreePanelBase (&p, "fileTreeState")
    {
        tree.setMultiSelectEnabled (true);
        setRoot (std::make_unique<TreeItemTypes::GroupItem> (p.getMainGroup()));
        tree.setRootItemVisible (false);
    }

    void updateMissingFileStatuses()
    {
        if (auto* p = dynamic_cast<TreeItemTypes::FileTreeItemBase*> (rootItem.get()))
            p->checkFileStatus();
    }
};

struct ModuleTreePanel    : public TreePanelBase
{
    ModuleTreePanel (Project& p)
        : TreePanelBase (&p, "moduleTreeState")
    {
        tree.setMultiSelectEnabled (false);
        setRoot (std::make_unique<TreeItemTypes::EnabledModulesItem> (p));
        tree.setRootItemVisible (false);
    }
};

struct ExportersTreePanel    : public TreePanelBase
{
    ExportersTreePanel (Project& p)
        : TreePanelBase (&p, "exportersTreeState")
    {
        tree.setMultiSelectEnabled (false);
        setRoot (std::make_unique<TreeItemTypes::ExportersTreeRoot> (p));
        tree.setRootItemVisible (false);
    }
};

//==============================================================================
class Sidebar    : public Component,
                   private ChangeListener
{
public:
    Sidebar (Project* p)
        : project (p)
    {
        setFocusContainerType (FocusContainerType::focusContainer);

        if (project != nullptr)
            buildConcertina();
    }

    ~Sidebar() override
    {
        TreePanelBase* panels[] = { getFileTreePanel(), getModuleTreePanel(), getExportersTreePanel() };

        for (auto* panel : panels)
            if (panel != nullptr)
                panel->saveOpenness();
    }

    void paint (Graphics& g) override
    {
        g.fillAll (findColour (secondaryBackgroundColourId));
    }

    void resized() override
    {
        concertinaPanel.setBounds (getLocalBounds().withTrimmedBottom (3));
    }

    TreePanelBase* getTreeWithSelectedItems()
    {
        for (auto i = concertinaPanel.getNumPanels() - 1; i >= 0; --i)
        {
            if (auto* treeComponent = dynamic_cast<ConcertinaTreeComponent*> (concertinaPanel.getPanel (i)))
            {
                if (auto* base = treeComponent->getTree())
                    if (base->tree.getNumSelectedItems() != 0)
                        return base;
            }
        }

        return nullptr;
    }

    FileTreePanel*      getFileTreePanel()        { return getPanel<FileTreePanel>      (0); }
    ModuleTreePanel*    getModuleTreePanel()      { return getPanel<ModuleTreePanel>    (1); }
    ExportersTreePanel* getExportersTreePanel()   { return getPanel<ExportersTreePanel> (2); }

    void showPanel (int panelIndex)
    {
        jassert (isPositiveAndBelow (panelIndex, concertinaPanel.getNumPanels()));

        concertinaPanel.expandPanelFully (concertinaPanel.getPanel (panelIndex), true);
    }

private:
    //==============================================================================
    template <typename PanelType>
    PanelType* getPanel (int panelIndex)
    {
        if (auto* panel = dynamic_cast<ConcertinaTreeComponent*> (concertinaPanel.getPanel (panelIndex)))
            return dynamic_cast<PanelType*> (panel->getTree());

        return nullptr;
    }

    void changeListenerCallback (ChangeBroadcaster* source) override
    {
        const auto pointerMatches = [source] (const std::unique_ptr<ConcertinaHeader>& header) { return header.get() == source; };
        const auto it = std::find_if (headers.begin(), headers.end(), pointerMatches);
        const auto index = (int) std::distance (headers.begin(), it);

        if (index != (int) headers.size())
            concertinaPanel.expandPanelFully (concertinaPanel.getPanel (index), true);
    }

    void buildConcertina()
    {
        for (auto i = concertinaPanel.getNumPanels() - 1; i >= 0 ; --i)
            concertinaPanel.removePanel (concertinaPanel.getPanel (i));

        headers.clear();

        auto addPanel = [this] (const String& name,
                                TreePanelBase* tree,
                                ConcertinaTreeComponent::AdditionalComponents components,
                                const Path& icon)
        {
            if (project != nullptr)
                concertinaPanel.addPanel (-1, new ConcertinaTreeComponent (name, tree, components), true);

            headers.push_back (std::make_unique<ConcertinaHeader> (name, icon));
        };

        using AdditionalComponents = ConcertinaTreeComponent::AdditionalComponents;

        addPanel ("File Explorer", new FileTreePanel (*project),
                  AdditionalComponents{}
                      .with (AdditionalComponents::addButton)
                      .with (AdditionalComponents::findPanel),
                  getIcons().fileExplorer);

        addPanel ("Modules", new ModuleTreePanel (*project),
                  AdditionalComponents{}
                      .with (AdditionalComponents::addButton)
                      .with (AdditionalComponents::settingsButton),
                  getIcons().modules);

        addPanel ("Exporters", new ExportersTreePanel (*project),
                  AdditionalComponents{}.with (AdditionalComponents::addButton),
                  getIcons().exporter);

        for (int i = 0; i < concertinaPanel.getNumPanels(); ++i)
        {
            auto* p = concertinaPanel.getPanel (i);
            auto* h = headers[(size_t) i].get();
            p->addMouseListener (this, true);

            h->addChangeListener (this);
            h->yPosition = i * 30;

            concertinaPanel.setCustomPanelHeader (p, h, false);
            concertinaPanel.setPanelHeaderSize (p, 30);
        }

        addAndMakeVisible (concertinaPanel);
    }

    void mouseDown (const MouseEvent& e) override
    {
        for (auto i = concertinaPanel.getNumPanels() - 1; i >= 0; --i)
        {
            if (auto* p = concertinaPanel.getPanel (i))
            {
                if (! (p->isParentOf (e.eventComponent)))
                {
                    auto* base = dynamic_cast<TreePanelBase*> (p);

                    if (base == nullptr)
                        if (auto* concertina = dynamic_cast<ConcertinaTreeComponent*> (p))
                            base = concertina->getTree();

                    if (base != nullptr)
                        base->tree.clearSelectedItems();
                }
            }
        }
    }

    //==============================================================================
    ConcertinaPanel concertinaPanel;
    std::vector<std::unique_ptr<ConcertinaHeader>> headers;
    Project* project = nullptr;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Sidebar)
};