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

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

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 6 End-User License
   Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).

   End User License Agreement: www.juce.com/juce-6-licence
   Privacy Policy: www.juce.com/juce-privacy-policy

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

   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 = default;

    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;
    std::unique_ptr<Component> createItemComponent() override;
    String getTooltip() override            { return {}; }
    String getAccessibilityName() override  { return getDisplayName(); }

    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();
    void showRenameBox();

    virtual void deleteItem()                              {}
    virtual void deleteAllSelectedItems()                  {}
    virtual void showDocument()                            {}
    virtual void showMultiSelectionPopupMenu (Point<int>)  {}
    virtual void showPopupMenu (Point<int>)                {}
    virtual void showAddMenu (Point<int>)                  {}
    virtual void handlePopupMenuResult (int)               {}
    virtual void setSearchFilter (const String&)           {}

    void launchPopupMenu (PopupMenu&, Point<int>); // runs asynchronously, and produces a callback to handlePopupMenuResult().

    //==============================================================================
    // 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 = 0;

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 (std::unique_ptr<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 (e.getMouseDownScreenPosition());
        }
    }

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

private:
    String opennessStateKey, emptyTreeMessage;
};

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

    void paint (Graphics& g) override
    {
        if (item == nullptr)
            return;

        auto bounds = getLocalBounds().toFloat();
        auto iconBounds = bounds.removeFromLeft ((float) iconWidth).reduced (7, 5);

        bounds.removeFromRight ((float) 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);
    }

    WeakReference<JucerTreeViewBase> item;
    OwnedArray<Component> buttons;

    const int iconWidth = 25;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (TreeItemComponent)
};