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

   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 ProjectContentComponent;
class Project;

//==============================================================================
class JucerTreeViewBase   : public TreeViewItem,
                            public TooltipClient
{
public:
    JucerTreeViewBase();
    ~JucerTreeViewBase() override;

    int getItemWidth() const override                   { return -1; }
    int getItemHeight() const override                  { return 25; }

    void paintOpenCloseButton (Graphics&, const Rectangle<float>& area, Colour backgroundColour, bool isMouseOver) override;
    void paintItem (Graphics& g, int width, int height) override;
    void itemClicked (const MouseEvent& e) override;
    void itemSelectionChanged (bool isNowSelected) override;
    void itemDoubleClicked (const MouseEvent&) override;
    Component* createItemComponent() override;
    String getTooltip() override    { return {}; }

    void cancelDelayedSelectionTimer();

    //==============================================================================
    virtual bool isRoot() const                                   { return false; }
    virtual Font getFont() const;
    virtual String getRenamingName() const = 0;
    virtual String getDisplayName() const = 0;
    virtual void setName (const String& newName) = 0;
    virtual bool isMissing() const = 0;
    virtual bool hasWarnings() const                              { return false; }
    virtual Icon getIcon() const = 0;
    virtual bool isIconCrossedOut() const                         { return false; }
    virtual void paintIcon (Graphics& g, Rectangle<float> area);
    virtual void paintContent (Graphics& g, Rectangle<int> area);
    virtual int getRightHandButtonSpace() { return 0; }
    virtual Colour getContentColour (bool isIcon) const;
    virtual int getMillisecsAllowedForDragGesture()               { return 120; }
    virtual File getDraggableFile() const                         { return {}; }

    void refreshSubItems();
    virtual void deleteItem();
    virtual void deleteAllSelectedItems();
    virtual void showDocument();
    virtual void showMultiSelectionPopupMenu();
    virtual void showRenameBox();

    void launchPopupMenu (PopupMenu&); // runs asynchronously, and produces a callback to handlePopupMenuResult().
    virtual void showPopupMenu();
    virtual void showAddMenu();
    virtual void handlePopupMenuResult (int resultCode);
    virtual void setSearchFilter (const String&) {}

    //==============================================================================
    // To handle situations where an item gets deleted before openness is
    // restored for it, this OpennessRestorer keeps only a pointer to the
    // topmost tree item.
    struct WholeTreeOpennessRestorer   : public OpennessRestorer
    {
        WholeTreeOpennessRestorer (TreeViewItem& item)  : OpennessRestorer (getTopLevelItem (item))
        {}

    private:
        static TreeViewItem& getTopLevelItem (TreeViewItem& item)
        {
            if (TreeViewItem* const p = item.getParentItem())
                return getTopLevelItem (*p);

            return item;
        }
    };

    int textX;

protected:
    ProjectContentComponent* getProjectContentComponent() const;
    virtual void addSubItems() {}

private:
    class ItemSelectionTimer;
    friend class ItemSelectionTimer;
    std::unique_ptr<Timer> delayedSelectionTimer;

    void invokeShowDocument();

    JUCE_DECLARE_WEAK_REFERENCEABLE (JucerTreeViewBase)
};

//==============================================================================
class TreePanelBase   : public Component
{
public:
    TreePanelBase (const Project* p, const String& treeviewID)
        : project (p), opennessStateKey (treeviewID)
    {
        addAndMakeVisible (tree);

        tree.setRootItemVisible (true);
        tree.setDefaultOpenness (true);
        tree.setColour (TreeView::backgroundColourId, Colours::transparentBlack);
        tree.setIndentSize (14);
        tree.getViewport()->setScrollBarThickness (6);

        tree.addMouseListener (this, true);
    }

    ~TreePanelBase() override
    {
        tree.setRootItem (nullptr);
    }

    void setRoot (JucerTreeViewBase*);
    void saveOpenness();

    virtual void deleteSelectedItems()
    {
        if (rootItem != nullptr)
            rootItem->deleteAllSelectedItems();
    }

    void setEmptyTreeMessage (const String& newMessage)
    {
        if (emptyTreeMessage != newMessage)
        {
            emptyTreeMessage = newMessage;
            repaint();
        }
    }

    static void drawEmptyPanelMessage (Component& comp, Graphics& g, const String& message)
    {
        const int fontHeight = 13;
        const Rectangle<int> area (comp.getLocalBounds());
        g.setColour (comp.findColour (defaultTextColourId));
        g.setFont ((float) fontHeight);
        g.drawFittedText (message, area.reduced (4, 2), Justification::centred, area.getHeight() / fontHeight);
    }

    void paint (Graphics& g) override
    {
        if (emptyTreeMessage.isNotEmpty() && (rootItem == nullptr || rootItem->getNumSubItems() == 0))
            drawEmptyPanelMessage (*this, g, emptyTreeMessage);
    }

    void resized() override
    {
        tree.setBounds (getAvailableBounds());
    }

    Rectangle<int> getAvailableBounds() const
    {
        return Rectangle<int> (0, 2, getWidth() - 2, getHeight() - 2);
    }

    void mouseDown (const MouseEvent& e) override
    {
        if (e.eventComponent == &tree)
        {
            tree.clearSelectedItems();

            if (e.mods.isRightButtonDown())
                rootItem->showPopupMenu();
        }
    }

    const Project* project;
    TreeView tree;
    std::unique_ptr<JucerTreeViewBase> rootItem;

private:
    String opennessStateKey, emptyTreeMessage;
};

//==============================================================================
class TreeItemComponent   : public Component
{
public:
    TreeItemComponent (JucerTreeViewBase& i)  : item (i)
    {
        setInterceptsMouseClicks (false, true);
        item.textX = iconWidth;
    }

    void paint (Graphics& g) override
    {
        auto bounds = getLocalBounds().toFloat();
        auto iconBounds = bounds.removeFromLeft ((float) iconWidth).reduced (7, 5);

        bounds.removeFromRight (buttons.size() * bounds.getHeight());

        item.paintIcon    (g, iconBounds);
        item.paintContent (g, bounds.toNearestInt());
    }

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

        for (int i = buttons.size(); --i >= 0;)
            buttons.getUnchecked(i)->setBounds (r.removeFromRight (r.getHeight()));
    }

    void addRightHandButton (Component* button)
    {
        buttons.add (button);
        addAndMakeVisible (button);
    }

    JucerTreeViewBase& item;
    OwnedArray<Component> buttons;

    const int iconWidth = 25;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (TreeItemComponent)
};