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

   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


//==============================================================================
struct ColourPropertyComponent  : public PropertyComponent
{
    ColourPropertyComponent (UndoManager* undoManager, const String& name, const Value& colour,
                             Colour defaultColour, bool canResetToDefault)
        : PropertyComponent (name),
          colourEditor (undoManager, colour, defaultColour, canResetToDefault)
    {
        addAndMakeVisible (colourEditor);
    }

    void resized() override
    {
        colourEditor.setBounds (getLookAndFeel().getPropertyComponentContentPosition (*this));
    }

    void refresh() override {}

private:
    /**
        A component that shows a colour swatch with hex ARGB value, and which pops up
        a colour selector when you click it.
    */
    struct ColourEditorComponent    : public Component,
                                      public Value::Listener
    {
        ColourEditorComponent (UndoManager* um, const Value& colour,
                               Colour defaultCol, const bool canReset)
            : undoManager (um), colourValue (colour), defaultColour (defaultCol),
              canResetToDefault (canReset)
        {
            colourValue.addListener (this);
        }

        void paint (Graphics& g) override
        {
            const Colour colour (getColour());

            g.fillAll (Colours::grey);
            g.fillCheckerBoard (getLocalBounds().reduced (2).toFloat(),
                                10.0f, 10.0f,
                                Colour (0xffdddddd).overlaidWith (colour),
                                Colour (0xffffffff).overlaidWith (colour));

            g.setColour (Colours::white.overlaidWith (colour).contrasting());
            g.setFont (Font (getHeight() * 0.6f, Font::bold));
            g.drawFittedText (colour.toDisplayString (true), getLocalBounds().reduced (2, 1),
                              Justification::centred, 1);
        }

        Colour getColour() const
        {
            if (colourValue.toString().isEmpty())
                return defaultColour;

            return Colour::fromString (colourValue.toString());
        }

        void setColour (Colour newColour)
        {
            if (getColour() != newColour)
            {
                if (newColour == defaultColour && canResetToDefault)
                    colourValue = var();
                else
                    colourValue = newColour.toDisplayString (true);
            }
        }

        void resetToDefault()
        {
            setColour (defaultColour);
        }

        void refresh()
        {
            const Colour col (getColour());

            if (col != lastColour)
            {
                lastColour = col;
                repaint();
            }
        }

        void mouseDown (const MouseEvent&) override
        {
            if (undoManager != nullptr)
                undoManager->beginNewTransaction();

            CallOutBox::launchAsynchronously (new PopupColourSelector (colourValue,
                                                                       defaultColour,
                                                                       canResetToDefault),
                                              getScreenBounds(), nullptr);
        }

        void valueChanged (Value&) override
        {
            refresh();
        }

        UndoManager* undoManager;
        Value colourValue;
        Colour lastColour;
        const Colour defaultColour;
        const bool canResetToDefault;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ColourEditorComponent)
    };

    //==============================================================================
    struct PopupColourSelector   : public Component,
                                   public ChangeListener,
                                   public Value::Listener
    {
        PopupColourSelector (const Value& colour,
                             Colour defaultCol,
                             const bool canResetToDefault)
            : defaultButton ("Reset to Default"),
              colourValue (colour),
              defaultColour (defaultCol)
        {
            addAndMakeVisible (selector);
            selector.setName ("Colour");
            selector.setCurrentColour (getColour());
            selector.addChangeListener (this);

            if (canResetToDefault)
            {
                addAndMakeVisible (defaultButton);
                defaultButton.onClick = [this]
                {
                    setColour (defaultColour);
                    selector.setCurrentColour (defaultColour);
                };
            }

            colourValue.addListener (this);
            setSize (300, 400);
        }

        void resized() override
        {
            if (defaultButton.isVisible())
            {
                selector.setBounds (0, 0, getWidth(), getHeight() - 30);
                defaultButton.changeWidthToFitText (22);
                defaultButton.setTopLeftPosition (10, getHeight() - 26);
            }
            else
            {
                selector.setBounds (getLocalBounds());
            }
        }

        Colour getColour() const
        {
            if (colourValue.toString().isEmpty())
                return defaultColour;

            return Colour::fromString (colourValue.toString());
        }

        void setColour (Colour newColour)
        {
            if (getColour() != newColour)
            {
                if (newColour == defaultColour && defaultButton.isVisible())
                    colourValue = var();
                else
                    colourValue = newColour.toDisplayString (true);
            }
        }

        void changeListenerCallback (ChangeBroadcaster*) override
        {
            if (selector.getCurrentColour() != getColour())
                setColour (selector.getCurrentColour());
        }

        void valueChanged (Value&) override
        {
            selector.setCurrentColour (getColour());
        }

    private:
        StoredSettings::ColourSelectorWithSwatches selector;
        TextButton defaultButton;
        Value colourValue;
        Colour defaultColour;
    };

    ColourEditorComponent colourEditor;
};