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

   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_ButtonDocument.h"
#include "../jucer_UtilityFunctions.h"

//==============================================================================
static const int normalOff = 0;
static const int overOff = 1;
static const int downOff = 2;
static const int normalOn = 3;
static const int overOn = 4;
static const int downOn = 5;
static const int background = 6;


//==============================================================================
ButtonDocument::ButtonDocument (SourceCodeDocument* c)
    : JucerDocument (c)
{
    paintStatesEnabled [normalOff] = true;
    paintStatesEnabled [overOff] = true;
    paintStatesEnabled [downOff] = true;
    paintStatesEnabled [normalOn] = false;
    paintStatesEnabled [overOn] = false;
    paintStatesEnabled [downOn] = false;
    paintStatesEnabled [background] = false;

    parentClasses = "public juce::Button";

    for (int i = 7; --i >= 0;)
    {
        paintRoutines[i].reset (new PaintRoutine());
        paintRoutines[i]->setDocument (this);
        paintRoutines[i]->setBackgroundColour (Colours::transparentBlack);
    }
}

ButtonDocument::~ButtonDocument()
{
}

static const char* const stateNames[] =
{
    "normal", "over", "down",
    "normal on", "over on", "down on",
    "common background"
};

static int stateNameToIndex (const String& name)
{
    for (int i = 7; --i >= 0;)
        if (name.equalsIgnoreCase (stateNames[i]))
            return i;

    jassertfalse;
    return normalOff;
}


int ButtonDocument::getNumPaintRoutines() const
{
    int n = 0;

    for (int i = 7; --i >= 0;)
        if (paintStatesEnabled [i])
            ++n;

    return n;
}

StringArray ButtonDocument::getPaintRoutineNames() const
{
    StringArray s;

    for (int i = 0; i < 7; ++i)
        if (paintStatesEnabled [i])
            s.add (stateNames [i]);

    return s;
}

PaintRoutine* ButtonDocument::getPaintRoutine (const int index) const
{
    int n = 0;

    for (int i = 0; i < 7; ++i)
    {
        if (paintStatesEnabled [i])
        {
            if (index == n)
                return paintRoutines[i].get();

            ++n;
        }
    }

    jassertfalse;
    return {};
}

void ButtonDocument::setStatePaintRoutineEnabled (const int index, bool b)
{
    jassert (index > 0 && index < 7);

    if (paintStatesEnabled [index] != b)
    {
        paintStatesEnabled [index] = b;
        changed();
    }
}

bool ButtonDocument::isStatePaintRoutineEnabled (const int index) const
{
    return paintStatesEnabled [index];
}

int ButtonDocument::chooseBestEnabledPaintRoutine (int paintRoutineWanted) const
{
    switch (paintRoutineWanted)
    {
        case normalOff: return normalOff;
        case overOff:   return paintStatesEnabled [overOff] ? overOff : normalOff;
        case downOff:   return paintStatesEnabled [downOff] ? downOff : chooseBestEnabledPaintRoutine (overOff);
        case normalOn:  return paintStatesEnabled [normalOn] ? normalOn : normalOff;
        case overOn:    return paintStatesEnabled [overOn] ? overOn : (paintStatesEnabled [normalOn] ? normalOn : chooseBestEnabledPaintRoutine (overOff));
        case downOn:    return paintStatesEnabled [downOn] ? downOn : ((paintStatesEnabled [overOn] || paintStatesEnabled [normalOn])
                                                                        ? chooseBestEnabledPaintRoutine (overOn)
                                                                        : chooseBestEnabledPaintRoutine (downOff));
        default: jassertfalse; break;
    }

    return normalOff;
}

//==============================================================================
String ButtonDocument::getTypeName() const
{
    return "Button";
}

JucerDocument* ButtonDocument::createCopy()
{
    auto newOne = new ButtonDocument (cpp);
    newOne->resources = resources;
    newOne->loadFromXml (*createXml());
    return newOne;
}

std::unique_ptr<XmlElement> ButtonDocument::createXml() const
{
    auto doc = JucerDocument::createXml();

    for (int i = 0; i < 7; ++i)
    {
        auto e = paintRoutines[i]->createXml();
        e->setAttribute ("buttonState", stateNames [i]);
        e->setAttribute ("enabled", paintStatesEnabled [i]);

        doc->addChildElement (e);
    }

    return doc;
}

bool ButtonDocument::loadFromXml (const XmlElement& xml)
{
    if (JucerDocument::loadFromXml (xml))
    {
        for (int i = 7; --i >= 0;)
            paintStatesEnabled [i] = false;

        forEachXmlChildElementWithTagName (xml, e, PaintRoutine::xmlTagName)
        {
            const int stateIndex = stateNameToIndex (e->getStringAttribute ("buttonState"));

            paintRoutines [stateIndex]->loadFromXml (*e);
            paintStatesEnabled [stateIndex] = e->getBoolAttribute ("enabled", stateIndex < normalOn);
        }

        changed();
        getUndoManager().clearUndoHistory();
        return true;
    }

    return false;
}

void ButtonDocument::getOptionalMethods (StringArray& baseClasses,
                                         StringArray& returnValues,
                                         StringArray& methods,
                                         StringArray& initialContents) const
{
    JucerDocument::getOptionalMethods (baseClasses, returnValues, methods, initialContents);

    addMethod ("juce::Button", "void", "clicked()", "", baseClasses, returnValues, methods, initialContents);
    addMethod ("juce::Button", "void", "buttonStateChanged()", "", baseClasses, returnValues, methods, initialContents);
}

//==============================================================================
class ButtonStatePaintEnabledProperty   : public BooleanPropertyComponent,
                                          private ChangeListener
{
public:
    ButtonStatePaintEnabledProperty (const String& name, ButtonDocument& doc, const int stateMethod_)
        : BooleanPropertyComponent (name, "enabled", "disabled"),
          document (doc),
          stateMethod (stateMethod_)
    {
        document.addChangeListener (this);
    }

    ~ButtonStatePaintEnabledProperty()
    {
        document.removeChangeListener (this);
    }

    void setState (bool newState)
    {
        document.setStatePaintRoutineEnabled (stateMethod, newState);
    }

    bool getState() const
    {
        return document.isStatePaintRoutineEnabled (stateMethod);
    }

private:
    void changeListenerCallback (ChangeBroadcaster*)
    {
        refresh();
    }

    ButtonDocument& document;
    const int stateMethod;
};

void ButtonDocument::addExtraClassProperties (PropertyPanel& panel)
{
    Array <PropertyComponent*> props;

    for (int i = 1; i < 7; ++i)
        props.add (new ButtonStatePaintEnabledProperty (stateNames[i], *this, i));

    panel.addSection ("Button paint routines", props);
}

//==============================================================================
class ButtonTestComponent   : public Button
{
public:
    ButtonTestComponent (ButtonDocument* const doc, const bool fillBackground)
        : Button (String()),
          document (doc),
          alwaysFillBackground (fillBackground)
    {
        setClickingTogglesState (true);
    }

    void paintButton (Graphics& g, bool isMouseOverButton, bool isButtonDown) override
    {
        if (document->paintStatesEnabled [background])
        {
            document->paintRoutines [background]->fillWithBackground (g, alwaysFillBackground);
            document->paintRoutines [background]->drawElements (g, getLocalBounds());
        }

        const int stateIndex
            = getToggleState()
                ? (isButtonDown ? document->chooseBestEnabledPaintRoutine (downOn)
                                : (isMouseOverButton ? document->chooseBestEnabledPaintRoutine (overOn)
                                                     : document->chooseBestEnabledPaintRoutine (normalOn)))
                : (isButtonDown ? document->chooseBestEnabledPaintRoutine (downOff)
                                : (isMouseOverButton ? document->chooseBestEnabledPaintRoutine (overOff)
                                                     : normalOff));

        document->paintRoutines [stateIndex]->fillWithBackground (g, ! document->paintStatesEnabled [background]);
        document->paintRoutines [stateIndex]->drawElements (g, getLocalBounds());
    }

private:
    ButtonDocument* const document;
    const bool alwaysFillBackground;
};

Component* ButtonDocument::createTestComponent (const bool alwaysFillBackground)
{
    return new ButtonTestComponent (this, alwaysFillBackground);
}

//==============================================================================
void ButtonDocument::fillInGeneratedCode (GeneratedCode& code) const
{
    JucerDocument::fillInGeneratedCode (code);

    code.parentClassInitialiser = "Button (" + quotedString (code.componentName, false) + ")";
    code.removeCallback ("void", "paint (Graphics& g)");
}

void ButtonDocument::fillInPaintCode (GeneratedCode& code) const
{
    jassert (paintStatesEnabled [normalOff]);
    String paintCode [7];

    for (int i = 0; i < 7; ++i)
        if (paintStatesEnabled [i])
            paintRoutines[i]->fillInGeneratedCode (code, paintCode [i]);

    String& s = code.getCallbackCode ("public juce::Button",
                                      "void",
                                      "paintButton (juce::Graphics& g, bool isMouseOverButton, bool isButtonDown)",
                                      false);

    int numPaintRoutines = getNumPaintRoutines();

    if (paintStatesEnabled [background])
    {
        s << paintCode [background] << "\n";
        --numPaintRoutines;
    }

    if (numPaintRoutines == 1)
    {
        s << paintCode [normalOff];
    }
    else if (numPaintRoutines == downOff && (paintStatesEnabled [overOff] || paintStatesEnabled [downOff] || paintStatesEnabled [normalOn]))
    {
        if (paintStatesEnabled [normalOn])
        {
            s << "if (getToggleState())\n{\n    "
              << CodeHelpers::indent (paintCode [normalOn], 4, false).trimEnd();
        }
        else if (paintStatesEnabled [overOff])
        {
            s << "if (isButtonDown || isMouseOverButton)\n{\n    "
              << CodeHelpers::indent (paintCode [overOff], 4, false).trimEnd();
        }
        else
        {
            s << "if (isButtonDown)\n{\n    "
              << CodeHelpers::indent (paintCode [downOff], 4, false).trimEnd();
        }

        s << "\n}\nelse\n{\n    "
          <<  CodeHelpers::indent (paintCode [normalOff], 4, false).trimEnd()
          << "\n}\n";
    }
    else if (numPaintRoutines == normalOn && paintStatesEnabled [overOff] && paintStatesEnabled [downOff])
    {
        s << "if (isButtonDown)\n{\n    "
          << CodeHelpers::indent (paintCode [downOff], 4, false).trimEnd()
          << "\n}\nelse if (isMouseOverButton)\n{\n    "
          << CodeHelpers::indent (paintCode [overOff], 4, false).trimEnd()
          << "\n}\nelse\n{\n    "
          << CodeHelpers::indent (paintCode [normalOff], 4, false).trimEnd()
          << "\n}\n";
    }
    else
    {
        if (paintStatesEnabled [normalOn] || paintStatesEnabled [overOn] || paintStatesEnabled [downOn])
        {
            s << "switch (getToggleState() ? (isButtonDown ? "
              << chooseBestEnabledPaintRoutine (downOn) << " : (isMouseOverButton ? "
              << chooseBestEnabledPaintRoutine (overOn) << " : "
              << chooseBestEnabledPaintRoutine (normalOn) << "))\n                         : (isButtonDown ? "
              << chooseBestEnabledPaintRoutine (downOff) << " : (isMouseOverButton ? "
              << chooseBestEnabledPaintRoutine (overOff) << " : 0)))\n{\n";
        }
        else
        {
            s << "switch (isButtonDown ? " << chooseBestEnabledPaintRoutine (downOff)
              << " : (isMouseOverButton ? " << chooseBestEnabledPaintRoutine (overOff)
              << " : 0))\n{\n";
        }

        for (int i = 0; i < 6; ++i)
        {
            if (paintStatesEnabled [i])
            {
                s << "case " << i << ":\n    {\n        "
                  << CodeHelpers::indent (paintCode [i], 8, false).trimEnd()
                  << "\n        break;\n    }\n\n";
            }
        }

        s << "default:\n    break;\n}\n";
    }
}