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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   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 SVGPathDataComponent  : public Component,
                              public FileDragAndDropTarget

{
public:
    SVGPathDataComponent()
    {
        desc.setJustificationType (Justification::centred);
        addAndMakeVisible (desc);

        userText.setFont (getAppSettings().appearance.getCodeFont().withHeight (13.0f));
        userText.setMultiLine (true, true);
        userText.setReturnKeyStartsNewLine (true);
        addAndMakeVisible (userText);
        userText.onTextChange = [this] { update(); };
        userText.onEscapeKey  = [this] { getTopLevelComponent()->exitModalState (0); };

        resultText.setFont (getAppSettings().appearance.getCodeFont().withHeight (13.0f));
        resultText.setMultiLine (true, true);
        resultText.setReadOnly (true);
        resultText.setSelectAllWhenFocused (true);
        addAndMakeVisible (resultText);

        userText.setText (getLastText());

        addAndMakeVisible (copyButton);
        copyButton.onClick = [this] { SystemClipboard::copyTextToClipboard (resultText.getText()); };

        addAndMakeVisible (closeSubPathButton);
        closeSubPathButton.onClick = [this] { update(); };
        closeSubPathButton.setToggleState (true, NotificationType::dontSendNotification);

        addAndMakeVisible (fillPathButton);
        fillPathButton.onClick = [this] { update(); };
        fillPathButton.setToggleState (true, NotificationType::dontSendNotification);
    }

    void update()
    {
        getLastText() = userText.getText();
        auto text = getLastText().trim().unquoted().trim();

        path = Drawable::parseSVGPath (text);

        if (path.isEmpty())
            path = pathFromPoints (text);

        String result = "No path generated.. Not a valid SVG path string?";

        if (! path.isEmpty())
        {
            MemoryOutputStream data;
            path.writePathToStream (data);

            MemoryOutputStream out;

            out << "static const unsigned char pathData[] = ";
            build_tools::writeDataAsCppLiteral (data.getMemoryBlock(), out, false, true);
            out << newLine
                << newLine
                << "Path path;" << newLine
                << "path.loadPathFromData (pathData, sizeof (pathData));" << newLine;

            result = out.toString();
        }

        resultText.setText (result, false);
        repaint (previewPathArea);
    }

    void resized() override
    {
        auto r = getLocalBounds().reduced (8);

        auto bottomSection = r.removeFromBottom (30);
        copyButton.setBounds (bottomSection.removeFromLeft (50));
        bottomSection.removeFromLeft (25);
        fillPathButton.setBounds (bottomSection.removeFromLeft (bottomSection.getWidth() / 2));
        closeSubPathButton.setBounds (bottomSection);

        r.removeFromBottom (5);
        desc.setBounds (r.removeFromTop (44));
        r.removeFromTop (8);
        userText.setBounds (r.removeFromTop (r.getHeight() / 2));
        r.removeFromTop (8);
        previewPathArea = r.removeFromRight (r.getHeight());
        resultText.setBounds (r);
    }

    void paint (Graphics& g) override
    {
        if (dragOver)
        {
            g.setColour (findColour (secondaryBackgroundColourId).brighter());
            g.fillAll();
        }

        g.setColour (findColour (defaultTextColourId));
        path.applyTransform (path.getTransformToScaleToFit (previewPathArea.reduced (4).toFloat(), true));

        if (fillPathButton.getToggleState())
            g.fillPath (path);
        else
            g.strokePath (path, PathStrokeType (2.0f));
    }

    void lookAndFeelChanged() override
    {
        userText.applyFontToAllText (userText.getFont());
        resultText.applyFontToAllText (resultText.getFont());
    }

    bool isInterestedInFileDrag (const StringArray& files) override
    {
        return files.size() == 1
                && File (files[0]).hasFileExtension  ("svg");
    }

    void fileDragEnter (const StringArray&, int, int) override
    {
        dragOver = true;
        repaint();
    }

    void fileDragExit (const StringArray&) override
    {
        dragOver = false;
        repaint();
    }

    void filesDropped (const StringArray& files, int, int) override
    {
        dragOver = false;
        repaint();

        if (auto element = parseXML (File (files[0])))
        {
            if (auto* ePath = element->getChildByName ("path"))
                userText.setText (ePath->getStringAttribute ("d"), true);
            else if (auto* ePolygon = element->getChildByName ("polygon"))
                userText.setText (ePolygon->getStringAttribute ("points"), true);
        }
    }

    Path pathFromPoints (String pointsText)
    {
        auto points = StringArray::fromTokens (pointsText, " ,", "");
        points.removeEmptyStrings();

        jassert (points.size() % 2 == 0);

        Path p;

        for (int i = 0; i < points.size() / 2; i++)
        {
            auto x = points[i * 2].getFloatValue();
            auto y = points[i * 2 + 1].getFloatValue();

            if (i == 0)
                p.startNewSubPath ({ x, y });
            else
                p.lineTo ({ x, y });
        }

        if (closeSubPathButton.getToggleState())
            p.closeSubPath();

        return p;
    }

private:
    Label desc { {}, "Paste an SVG path string into the top box, and it'll be converted to some C++ "
                     "code that will load it as a Path object.." };
    TextButton copyButton { "Copy" };
    TextEditor userText, resultText;

    ToggleButton closeSubPathButton { "Close sub-path" };
    ToggleButton fillPathButton     { "Fill path" };

    Rectangle<int> previewPathArea;
    Path path;
    bool dragOver = false;

    String& getLastText()
    {
        static String t;
        return t;
    }
};