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

   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.

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

#include "../../Application/jucer_Headers.h"
#include "jucer_PaintElementImage.h"

PaintElementImage::PaintElementImage (PaintRoutine* pr)
    : PaintElement (pr, "Image"),
      opacity (1.0),
      mode (stretched)
{
}

PaintElementImage::~PaintElementImage() {}

const Drawable* PaintElementImage::getDrawable()
{
    if (JucerDocument* const document = getDocument())
        return document->getResources().getDrawable (resourceName);

    return nullptr;
}

void PaintElementImage::draw (Graphics& g, const ComponentLayout* layout, const Rectangle<int>& parentArea)
{
    const Rectangle<int> r (position.getRectangle (parentArea, layout));

    if (const Drawable* const image = getDrawable())
    {
        image->drawWithin (g, r.toFloat(),
                           mode == stretched ? RectanglePlacement::stretchToFit
                                             : (mode == proportionalReducingOnly ? (RectanglePlacement::centred | RectanglePlacement::onlyReduceInSize)
                                                                                 : RectanglePlacement::centred),
                           (float) opacity);
    }
    else
    {
        g.setColour (Colours::grey.withAlpha (0.5f));
        g.fillRect (r);

        g.setColour (Colours::black);
        g.drawText ("(image missing)",
                    r.getX(), r.getY(), r.getWidth(), r.getHeight(),
                    Justification::centred, true);
    }
}

//==============================================================================
void PaintElementImage::getEditableProperties (Array <PropertyComponent*>& props, bool multipleSelected)
{
    PaintElement::getEditableProperties (props, multipleSelected);

    props.add (new ImageElementResourceProperty (this));
    props.add (new StretchModeProperty (this));
    props.add (new OpacityProperty (this));
    props.add (new ResetSizeProperty (this));
}

void PaintElementImage::fillInGeneratedCode (GeneratedCode& code, String& paintMethodCode)
{
    if (opacity > 0)
    {
        String x, y, w, h, r;
        positionToCode (position, getDocument()->getComponentLayout(), x, y, w, h);
        r << "{\n"
          << "    int x = " << x << ", y = " << y << ", width = " << w << ", height = " << h << ";\n"
          << "    //[UserPaintCustomArguments] Customize the painting arguments here..\n"
          << customPaintCode
          << "    //[/UserPaintCustomArguments]\n";

        if (dynamic_cast<const DrawableImage*> (getDrawable()))
        {
            const String imageVariable ("cachedImage_" + resourceName.replace ("::", "_") + "_" + String (code.getUniqueSuffix()));

            code.addImageResourceLoader (imageVariable, resourceName);

            if (opacity >= 254.0 / 255.0)
                r << "    g.setColour (juce::Colours::black);\n";
            else
                r << "    g.setColour (juce::Colours::black.withAlpha (" << CodeHelpers::floatLiteral (opacity, 3) << "));\n";

            if (mode == stretched)
            {
                r << "    g.drawImage (" << imageVariable << ",\n"
                  << "                 x, y, width, height,\n"
                  << "                 0, 0, " << imageVariable << ".getWidth(), " << imageVariable << ".getHeight());\n";
            }
            else
            {
                r << "    g.drawImageWithin (" << imageVariable << ",\n"
                  << "                       x, y, width, height,\n"
                  << "                       ";

                if (mode == proportionalReducingOnly)
                    r << "juce::RectanglePlacement::centred | juce::RectanglePlacement::onlyReduceInSize";
                else
                    r << "juce::RectanglePlacement::centred";

                r << ",\n"
                  << "                       false);\n";
            }

        }
        else
        {
            if (resourceName.isNotEmpty())
            {
                const String imageVariable ("drawable" + String (code.getUniqueSuffix()));

                code.privateMemberDeclarations
                    << "std::unique_ptr<juce::Drawable> " << imageVariable << ";\n";

                code.constructorCode
                    << imageVariable << " = juce::Drawable::createFromImageData ("
                    << resourceName << ", " << resourceName << "Size);\n";

                code.destructorCode
                    << imageVariable << " = nullptr;\n";

                if (opacity >= 254.0 / 255.0)
                    r << "    g.setColour (juce::Colours::black);\n";
                else
                    r << "    g.setColour (juce::Colours::black.withAlpha (" << CodeHelpers::floatLiteral (opacity, 3) << "));\n";

                r << "    jassert (" << imageVariable << " != nullptr);\n"
                  << "    if (" << imageVariable << " != nullptr)\n"
                  << "        " << imageVariable  << "->drawWithin (g, juce::Rectangle<int> (x, y, width, height).toFloat(),\n"
                  << "    " << String::repeatedString (" ", imageVariable.length() + 18)
                  << (mode == stretched ? "juce::RectanglePlacement::stretchToFit"
                                        : (mode == proportionalReducingOnly ? "juce::RectanglePlacement::centred | juce::RectanglePlacement::onlyReduceInSize"
                                                                            : "juce::RectanglePlacement::centred"))
                  << ", " << CodeHelpers::floatLiteral (opacity, 3) << ");\n";
            }
        }

        r << "}\n\n";

        paintMethodCode += r;
    }
}

void PaintElementImage::applyCustomPaintSnippets (StringArray& snippets)
{
    customPaintCode.clear();

    if (! snippets.isEmpty() && opacity > 0)
    {
        customPaintCode = snippets[0];
        snippets.remove (0);
    }
}

//==============================================================================
PaintElementImage::SetResourceAction::SetResourceAction (PaintElementImage* const element, const String& newResource_)
    : PaintElementUndoableAction <PaintElementImage> (element),
      newResource (newResource_)
{
    oldResource = element->getResource();
}

bool PaintElementImage::SetResourceAction::perform()
{
    showCorrectTab();
    getElement()->setResource (newResource, false);
    return true;
}

bool PaintElementImage::SetResourceAction::undo()
{
    showCorrectTab();
    getElement()->setResource (oldResource, false);
    return true;
}

void PaintElementImage::setResource (const String& newName, const bool undoable)
{
    if (resourceName != newName)
    {
        if (undoable)
        {
            perform (new SetResourceAction (this, newName),
                     "Change image resource");
        }
        else
        {
            resourceName = newName;
            changed();
        }
    }

    repaint();
}

String PaintElementImage::getResource() const
{
    return resourceName;
}

//==============================================================================
PaintElementImage::SetOpacityAction::SetOpacityAction (PaintElementImage* const element, const double newOpacity_)
    : PaintElementUndoableAction <PaintElementImage> (element),
      newOpacity (newOpacity_)
{
    oldOpacity = element->getOpacity();
}

bool PaintElementImage::SetOpacityAction::perform()
{
    showCorrectTab();
    getElement()->setOpacity (newOpacity, false);
    return true;
}

bool PaintElementImage::SetOpacityAction::undo()
{
    showCorrectTab();
    getElement()->setOpacity (oldOpacity, false);
    return true;
}

void PaintElementImage::setOpacity (double newOpacity, const bool undoable)
{
    newOpacity = jlimit (0.0, 1.0, newOpacity);

    if (opacity != newOpacity)
    {
        if (undoable)
        {
            perform (new SetOpacityAction (this, newOpacity),
                     "Change image opacity");
        }
        else
        {
            opacity = newOpacity;
            changed();
        }
    }
}

double PaintElementImage::getOpacity() const noexcept               { return opacity; }

//==============================================================================
const char* PaintElementImage::getTagName() noexcept         { return "IMAGE"; }

void PaintElementImage::resetToImageSize()
{
    if (const Drawable* const image = getDrawable())
    {
        if (PaintRoutineEditor* ed = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
        {
            const Rectangle<int> parentArea (ed->getComponentArea());

            Rectangle<int> r (getCurrentBounds (parentArea));
            Rectangle<float> b (image->getDrawableBounds());

            r.setSize ((int) (b.getWidth()  + 0.999f),
                       (int) (b.getHeight() + 0.999f));

            setCurrentBounds (r, parentArea, true);
        }
    }
}

//==============================================================================
PaintElementImage::SetStretchModeAction::SetStretchModeAction (PaintElementImage* const element, const StretchMode newValue_)
    : PaintElementUndoableAction <PaintElementImage> (element),
      newValue (newValue_)
{
    oldValue = element->getStretchMode();
}

bool PaintElementImage::SetStretchModeAction::perform()
{
    showCorrectTab();
    getElement()->setStretchMode (newValue, false);
    return true;
}

bool PaintElementImage::SetStretchModeAction::undo()
{
    showCorrectTab();
    getElement()->setStretchMode (oldValue, false);
    return true;
}

PaintElementImage::StretchMode PaintElementImage::getStretchMode() const noexcept   { return mode; }

void PaintElementImage::setStretchMode (const StretchMode newMode, const bool undoable)
{
    if (mode != newMode)
    {
        if (undoable)
        {
            perform (new SetStretchModeAction (this, newMode),
                     "Change image mode");
        }
        else
        {
            mode = newMode;
            changed();
        }
    }
}

//==============================================================================
XmlElement* PaintElementImage::createXml() const
{
    XmlElement* e = new XmlElement (getTagName());
    position.applyToXml (*e);
    e->setAttribute ("resource", resourceName);
    e->setAttribute ("opacity", opacity);
    e->setAttribute ("mode", (int) mode);

    return e;
}

bool PaintElementImage::loadFromXml (const XmlElement& xml)
{
    if (xml.hasTagName (getTagName()))
    {
        position.restoreFromXml (xml, position);
        resourceName = xml.getStringAttribute ("resource", String());
        opacity = xml.getDoubleAttribute ("opacity", 1.0);
        mode = (StretchMode) xml.getIntAttribute ("mode", (int) stretched);

        repaint();
        return true;
    }

    jassertfalse;
    return false;
}

//==============================================================================
PaintElementImage::ImageElementResourceProperty::ImageElementResourceProperty (PaintElementImage* const e)
    : ImageResourceProperty <PaintElementImage> (e, "image source")
{
}

void PaintElementImage::ImageElementResourceProperty::setResource (const String& newName)
{
    if (element != nullptr)
        element->setResource (newName, true);
}

String PaintElementImage::ImageElementResourceProperty::getResource() const
{
    if (element != nullptr)
        return element->getResource();

    return {};
}


//==============================================================================
PaintElementImage::OpacityProperty::OpacityProperty (PaintElementImage* const e)
    : SliderPropertyComponent ("opacity", 0.0, 1.0, 0.001),
      listener (e)
{
    listener.setPropertyToRefresh (*this);
}

void PaintElementImage::OpacityProperty::setValue (double newValue)
{
    listener.owner->getDocument()->getUndoManager().undoCurrentTransactionOnly();
    listener.owner->setOpacity (newValue, true);
}

double PaintElementImage::OpacityProperty::getValue() const
{
    return listener.owner->getOpacity();
}

PaintElementImage::StretchModeProperty::StretchModeProperty (PaintElementImage* const e)
    : ChoicePropertyComponent ("stretch mode"),
      listener (e)
{
    listener.setPropertyToRefresh (*this);

    choices.add ("Stretched to fit");
    choices.add ("Maintain aspect ratio");
    choices.add ("Maintain aspect ratio, only reduce in size");
}

void PaintElementImage::StretchModeProperty::setIndex (int newIndex)
{
    listener.owner->setStretchMode ((StretchMode) newIndex, true);
}

int PaintElementImage::StretchModeProperty::getIndex() const
{
    return (int) listener.owner->getStretchMode();
}

PaintElementImage::ResetSizeProperty::ResetSizeProperty (PaintElementImage* const e)
    : ButtonPropertyComponent ("reset", false),
      element (e)
{
}

void PaintElementImage::ResetSizeProperty::buttonClicked()
{
    element->resetToImageSize();
}

String PaintElementImage::ResetSizeProperty::getButtonText() const   { return "reset to image size"; }