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

   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 ConcertinaHeader    : public Component,
                            public ChangeBroadcaster
{
public:
    ConcertinaHeader (String n, Path p)
        : Component (n), name (n), iconPath (p)
    {
        panelIcon = Icon (iconPath, Colours::white);

        nameLabel.setText (name, dontSendNotification);
        nameLabel.setJustificationType (Justification::centredLeft);
        nameLabel.setInterceptsMouseClicks (false, 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 (arrowPath = 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();
    }

    int direction = 0;
    int yPosition = 0;

private:
    String name;
    Label nameLabel;

    Path iconPath;
    Icon panelIcon;

    Rectangle<float> arrowBounds, iconBounds;
    Path arrowPath;

    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:
    ConcertinaTreeComponent (TreePanelBase* tree, bool hasAddButton = false,
                             bool hasSettingsButton = false, bool hasFindPanel = false)
         : treeToDisplay (tree)
    {
        if (hasAddButton)
        {
            addButton = std::make_unique<IconButton> ("Add", getIcons().plus);
            addAndMakeVisible (addButton.get());
            addButton->onClick = [this] { showAddMenu(); };
        }

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

        if (hasFindPanel)
        {
            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();
        }
        else
        {
            if (auto* item = dynamic_cast<JucerTreeViewBase*> (treeToDisplay->tree.getSelectedItem (0)))
                item->showAddMenu();
        }
    }

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

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ConcertinaTreeComponent)
};