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

   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.

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

#include "../../Application/jucer_Headers.h"
#include "../../Application/jucer_Application.h"
#include "../jucer_PaintRoutine.h"
#include "../jucer_UtilityFunctions.h"
#include "../UI/jucer_JucerCommandIDs.h"
#include "../UI/jucer_PaintRoutineEditor.h"
#include "../Properties/jucer_PositionPropertyBase.h"
#include "jucer_ElementSiblingComponent.h"
#include "jucer_PaintElementUndoableAction.h"


//==============================================================================
PaintElement::PaintElement (PaintRoutine* owner_,
                            const String& typeName_)
    : borderThickness (4),
      owner (owner_),
      typeName (typeName_),
      selected (false),
      dragging (false),
      originalAspectRatio (1.0)
{
    setRepaintsOnMouseActivity (true);

    position.rect.setWidth (100);
    position.rect.setHeight (100);

    setMinimumOnscreenAmounts (0, 0, 0, 0);
    setSizeLimits (borderThickness * 2 + 1, borderThickness * 2 + 1, 8192, 8192);

    border.reset (new ResizableBorderComponent (this, this));
    addChildComponent (border.get());

    border->setBorderThickness (BorderSize<int> (borderThickness));

    if (owner != nullptr)
        owner->getSelectedElements().addChangeListener (this);

    selfChangeListenerList.addChangeListener (this);
    siblingComponentsChanged();
}

PaintElement::~PaintElement()
{
    siblingComponents.clear();

    if (owner != nullptr)
    {
        owner->getSelectedElements().deselect (this);
        owner->getSelectedElements().removeChangeListener (this);
    }
}


//==============================================================================
void PaintElement::setInitialBounds (int parentWidth, int parentHeight)
{
    RelativePositionedRectangle pr (getPosition());
    pr.rect.setX (parentWidth / 4 + Random::getSystemRandom().nextInt (parentWidth / 4) - parentWidth / 8);
    pr.rect.setY (parentHeight / 3 + Random::getSystemRandom().nextInt (parentHeight / 4) - parentHeight / 8);
    setPosition (pr, false);
}

//==============================================================================
const RelativePositionedRectangle& PaintElement::getPosition() const
{
    return position;
}

class PaintElementMoveAction  : public PaintElementUndoableAction <PaintElement>
{
public:
    PaintElementMoveAction (PaintElement* const element, const RelativePositionedRectangle& newState_)
        : PaintElementUndoableAction <PaintElement> (element),
          newState (newState_),
          oldState (element->getPosition())
    {
    }

    bool perform()
    {
        showCorrectTab();
        getElement()->setPosition (newState, false);
        return true;
    }

    bool undo()
    {
        showCorrectTab();
        getElement()->setPosition (oldState, false);
        return true;
    }

    RelativePositionedRectangle newState, oldState;
};

class ChangePaintElementBoundsAction    : public PaintElementUndoableAction <PaintElement>
{
public:
    ChangePaintElementBoundsAction (PaintElement* const element, const Rectangle<int>& bounds)
        : PaintElementUndoableAction <PaintElement> (element),
          newBounds (bounds),
          oldBounds (element->getBounds())
    {
    }

    bool perform()
    {
        showCorrectTab();
        getElement()->setBounds (newBounds);
        return true;
    }

    bool undo()
    {
        showCorrectTab();
        getElement()->setBounds (oldBounds);
        return true;
    }

private:
    Rectangle<int> newBounds, oldBounds;
};

class ChangePaintElementBoundsAndPropertiesAction    : public PaintElementUndoableAction <PaintElement>
{
public:
    ChangePaintElementBoundsAndPropertiesAction (PaintElement* const element, const Rectangle<int>& bounds,
                                                 const NamedValueSet& props)
        : PaintElementUndoableAction <PaintElement> (element),
          newBounds (bounds),
          oldBounds (element->getBounds()),
          newProps (props),
          oldProps (element->getProperties())
    {
    }

    bool perform()
    {
        showCorrectTab();

        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getElement()->getParentComponent()))
            getElement()->setCurrentBounds (newBounds, pe->getComponentArea(), false);

        getElement()->getProperties() = newProps;
        return true;
    }

    bool undo()
    {
        showCorrectTab();

        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getElement()->getParentComponent()))
            getElement()->setCurrentBounds (oldBounds, pe->getComponentArea(), false);

        getElement()->getProperties() = oldProps;
        return true;
    }

private:
    Rectangle<int> newBounds, oldBounds;
    NamedValueSet newProps, oldProps;
};

void PaintElement::setPosition (const RelativePositionedRectangle& newPosition, const bool undoable)
{
    if (position != newPosition)
    {
        if (undoable)
        {
            perform (new PaintElementMoveAction (this, newPosition),
                     "Move " + getTypeName());
        }
        else
        {
            position = newPosition;

            if (owner != nullptr)
                owner->changed();
        }
    }
}

void PaintElement::setPaintElementBounds (const Rectangle<int>& newBounds, const bool undoable)
{
    if (getBounds() != newBounds)
    {
        if (undoable)
        {
            perform (new ChangePaintElementBoundsAction (this, newBounds), "Change paint element bounds");
        }
        else
        {
            setBounds (newBounds);
            changed();
        }
    }
}

void PaintElement::setPaintElementBoundsAndProperties (PaintElement* elementToPosition, const Rectangle<int>& newBounds,
                                                       PaintElement* referenceElement, const bool undoable)
{
    auto props = NamedValueSet (elementToPosition->getProperties());

    auto rect = elementToPosition->getPosition().rect;
    auto referenceElementPosition = referenceElement->getPosition();
    auto referenceElementRect = referenceElementPosition.rect;

    rect.setModes (referenceElementRect.getAnchorPointX(), referenceElementRect.getPositionModeX(),
                   referenceElementRect.getAnchorPointY(), referenceElementRect.getPositionModeY(),
                   referenceElementRect.getWidthMode(),    referenceElementRect.getHeightMode(),
                   elementToPosition->getBounds());

    props.set ("pos",         rect.toString());
    props.set ("relativeToX", String::toHexString (referenceElementPosition.relativeToX));
    props.set ("relativeToY", String::toHexString (referenceElementPosition.relativeToY));
    props.set ("relativeToW", String::toHexString (referenceElementPosition.relativeToW));
    props.set ("relativeToH", String::toHexString (referenceElementPosition.relativeToH));

    if (elementToPosition->getBounds() != newBounds || elementToPosition->getProperties() != props)
    {
        if (undoable)
        {
            perform (new ChangePaintElementBoundsAndPropertiesAction (elementToPosition, newBounds, props),
                     "Change paint element bounds");
        }
        else
        {
            if (auto* pe = dynamic_cast<PaintRoutineEditor*> (elementToPosition->getParentComponent()))
                elementToPosition->setCurrentBounds (newBounds, pe->getComponentArea(), false);

            elementToPosition->getProperties() = props;
            owner->changed();
        }
    }
}

//==============================================================================
Rectangle<int> PaintElement::getCurrentBounds (const Rectangle<int>& parentArea) const
{
    return position.getRectangle (parentArea, getDocument()->getComponentLayout());
}

void PaintElement::setCurrentBounds (const Rectangle<int>& newBounds,
                                     const Rectangle<int>& parentArea,
                                     const bool undoable)
{
    RelativePositionedRectangle pr (position);
    pr.updateFrom (newBounds.getX() - parentArea.getX(),
                   newBounds.getY() - parentArea.getY(),
                   jmax (1, newBounds.getWidth()),
                   jmax (1, newBounds.getHeight()),
                   Rectangle<int> (0, 0, parentArea.getWidth(), parentArea.getHeight()),
                   getDocument()->getComponentLayout());

    setPosition (pr, undoable);

    updateBounds (parentArea);
}

void PaintElement::updateBounds (const Rectangle<int>& parentArea)
{
    if (! parentArea.isEmpty())
    {
        setBounds (getCurrentBounds (parentArea)
                        .expanded (borderThickness,
                                   borderThickness));

        for (int i = siblingComponents.size(); --i >= 0;)
            siblingComponents.getUnchecked(i)->updatePosition();
    }
}

//==============================================================================
class ElementPositionProperty   : public PositionPropertyBase
{
public:
    ElementPositionProperty (PaintElement* e, const String& name,
                             ComponentPositionDimension dimension_)
       : PositionPropertyBase (e, name, dimension_, true, false,
                               e->getDocument()->getComponentLayout()),
         listener (e),
         element (e)
    {
        listener.setPropertyToRefresh (*this);
    }

    void setPosition (const RelativePositionedRectangle& newPos)
    {
        if (element->getOwner()->getSelectedElements().getNumSelected() > 1)
            positionOtherSelectedElements (getPosition(), newPos);

        listener.owner->setPosition (newPos, true);
    }

    RelativePositionedRectangle getPosition() const
    {
        return listener.owner->getPosition();
    }

private:
    ElementListener<PaintElement> listener;
    PaintElement* element;

    void positionOtherSelectedElements (const RelativePositionedRectangle& oldPos, const RelativePositionedRectangle& newPos)
    {
        for (auto* s : element->getOwner()->getSelectedElements())
        {
            if (s != element)
            {
                auto currentPos = s->getPosition();
                auto diff = 0.0;

                if (dimension == ComponentPositionDimension::componentX)
                {
                    diff = newPos.rect.getX() - oldPos.rect.getX();
                    currentPos.rect.setX (currentPos.rect.getX() + diff);
                }
                else if (dimension == ComponentPositionDimension::componentY)
                {
                    diff = newPos.rect.getY() - oldPos.rect.getY();
                    currentPos.rect.setY (currentPos.rect.getY() + diff);
                }
                else if (dimension == ComponentPositionDimension::componentWidth)
                {
                    diff = newPos.rect.getWidth() - oldPos.rect.getWidth();
                    currentPos.rect.setWidth (currentPos.rect.getWidth() + diff);
                }
                else if (dimension == ComponentPositionDimension::componentHeight)
                {
                    diff = newPos.rect.getHeight() - oldPos.rect.getHeight();
                    currentPos.rect.setHeight (currentPos.rect.getHeight() + diff);
                }

                s->setPosition (currentPos, true);
            }
        }
    }
};

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

    props.add (new ElementPositionProperty (this, "x", PositionPropertyBase::componentX));
    props.add (new ElementPositionProperty (this, "y", PositionPropertyBase::componentY));
    props.add (new ElementPositionProperty (this, "width", PositionPropertyBase::componentWidth));
    props.add (new ElementPositionProperty (this, "height", PositionPropertyBase::componentHeight));
}

//==============================================================================
JucerDocument* PaintElement::getDocument() const
{
    return owner->getDocument();
}

void PaintElement::changed()
{
    repaint();
    owner->changed();
}

bool PaintElement::perform (UndoableAction* action, const String& actionName)
{
    return owner->perform (action, actionName);
}

void PaintElement::parentHierarchyChanged()
{
    updateSiblingComps();
}

//==============================================================================
void PaintElement::drawExtraEditorGraphics (Graphics&, const Rectangle<int>& /*relativeTo*/)
{
}

void PaintElement::paint (Graphics& g)
{
    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
    {
        auto area = pe->getComponentArea();

        g.saveState();
        g.setOrigin (area.getPosition() - Component::getPosition());
        area.setPosition (0, 0);

        g.saveState();
        g.reduceClipRegion (0, 0, area.getWidth(), area.getHeight());

        draw (g, getDocument()->getComponentLayout(), area);

        g.restoreState();

        drawExtraEditorGraphics (g, area);
        g.restoreState();

        if (selected)
        {
            const BorderSize<int> borderSize (border->getBorderThickness());
            auto baseColour = findColour (defaultHighlightColourId);

            drawResizableBorder (g, getWidth(), getHeight(), borderSize,
                                 (isMouseOverOrDragging() || border->isMouseOverOrDragging()),
                                 baseColour.withAlpha (owner->getSelectedElements().getSelectedItem (0) == this ? 1.0f : 0.3f));
        }
        else if (isMouseOverOrDragging())
        {
            drawMouseOverCorners (g, getWidth(), getHeight());
        }
    }
}

void PaintElement::resized()
{
    border->setBounds (getLocalBounds());
}

void PaintElement::mouseDown (const MouseEvent& e)
{
    dragging = false;

    if (owner != nullptr)
    {
        owner->getSelectedPoints().deselectAll();
        mouseDownSelectStatus = owner->getSelectedElements().addToSelectionOnMouseDown (this, e.mods);
    }

    if (e.mods.isPopupMenu())
    {
        showPopupMenu();
        return; // this may be deleted now..
    }
}

void PaintElement::mouseDrag (const MouseEvent& e)
{
    if (! e.mods.isPopupMenu())
    {
        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
        {
            auto area = pe->getComponentArea();

            if (selected && ! dragging)
            {
                dragging = e.mouseWasDraggedSinceMouseDown();

                if (dragging)
                    owner->startDragging (area);
            }

            if (dragging)
                owner->dragSelectedComps (e.getDistanceFromDragStartX(),
                                          e.getDistanceFromDragStartY(),
                                          area);
        }
    }
}

void PaintElement::mouseUp (const MouseEvent& e)
{
    if (owner != nullptr)
    {
        if (dragging)
            owner->endDragging();

        if (owner != nullptr)
            owner->getSelectedElements().addToSelectionOnMouseUp (this, e.mods, dragging, mouseDownSelectStatus);
    }
}

void PaintElement::resizeStart()
{
    if (getHeight() > 0)
        originalAspectRatio = getWidth() / (double) getHeight();
    else
        originalAspectRatio = 1.0;
}

void PaintElement::resizeEnd()
{
}

void PaintElement::checkBounds (Rectangle<int>& b,
                                const Rectangle<int>& previousBounds,
                                const Rectangle<int>& limits,
                                const bool isStretchingTop,
                                const bool isStretchingLeft,
                                const bool isStretchingBottom,
                                const bool isStretchingRight)
{
    if (ModifierKeys::currentModifiers.isShiftDown())
        setFixedAspectRatio (originalAspectRatio);
    else
        setFixedAspectRatio (0.0);

    ComponentBoundsConstrainer::checkBounds (b, previousBounds, limits, isStretchingTop, isStretchingLeft, isStretchingBottom, isStretchingRight);

    if (auto* document = getDocument())
    {
        if (document->isSnapActive (true))
        {
            if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
            {
                auto area = pe->getComponentArea();

                int x = b.getX();
                int y = b.getY();
                int w = b.getWidth();
                int h = b.getHeight();

                x += borderThickness - area.getX();
                y += borderThickness - area.getY();
                w -= borderThickness * 2;
                h -= borderThickness * 2;

                int right = x + w;
                int bottom = y + h;

                if (isStretchingRight)
                    right = document->snapPosition (right);

                if (isStretchingBottom)
                    bottom = document->snapPosition (bottom);

                if (isStretchingLeft)
                    x = document->snapPosition (x);

                if (isStretchingTop)
                    y = document->snapPosition (y);

                w = (right - x) + borderThickness * 2;
                h = (bottom - y) + borderThickness * 2;
                x -= borderThickness - area.getX();
                y -= borderThickness - area.getY();

                b = { x, y, w, h };
            }
        }
    }
}

void PaintElement::applyBoundsToComponent (Component&, Rectangle<int> newBounds)
{
    if (getBounds() != newBounds)
    {
        getDocument()->getUndoManager().undoCurrentTransactionOnly();

        auto dX = newBounds.getX() - getX();
        auto dY = newBounds.getY() - getY();
        auto dW = newBounds.getWidth() - getWidth();
        auto dH = newBounds.getHeight() - getHeight();

        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
            setCurrentBounds (newBounds.expanded (-borderThickness, -borderThickness),
                              pe->getComponentArea(), true);

        if (owner->getSelectedElements().getNumSelected() > 1)
        {
            for (auto selectedElement : owner->getSelectedElements())
            {
                if (selectedElement != this)
                {
                    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (selectedElement->getParentComponent()))
                    {
                        Rectangle<int> r { selectedElement->getX() + dX, selectedElement->getY() + dY,
                                           selectedElement->getWidth() + dW, selectedElement->getHeight() + dH };

                        selectedElement->setCurrentBounds (r.expanded (-borderThickness, -borderThickness),
                                                           pe->getComponentArea(), true);
                    }
                }
            }
        }
    }
}

Rectangle<int> PaintElement::getCurrentAbsoluteBounds() const
{
    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
        return position.getRectangle (pe->getComponentArea(), getDocument()->getComponentLayout());

    return {};
}

void PaintElement::getCurrentAbsoluteBoundsDouble (double& x, double& y, double& w, double& h) const
{
    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
        position.getRectangleDouble (x, y, w, h, pe->getComponentArea(), getDocument()->getComponentLayout());
}

void PaintElement::changeListenerCallback (ChangeBroadcaster*)
{
    const bool nowSelected = owner != nullptr && owner->getSelectedElements().isSelected (this);

    if (selected != nowSelected)
    {
        selected = nowSelected;
        border->setVisible (nowSelected);
        repaint();

        selectionChanged (nowSelected);
    }

    updateSiblingComps();
}

void PaintElement::selectionChanged (const bool /*isSelected*/)
{
}

void PaintElement::createSiblingComponents()
{
}

void PaintElement::siblingComponentsChanged()
{
    siblingComponents.clear();
    selfChangeListenerList.sendChangeMessage();
}

void PaintElement::updateSiblingComps()
{
    if (selected && getParentComponent() != nullptr && owner->getSelectedElements().getNumSelected() == 1)
    {
        if (siblingComponents.size() == 0)
            createSiblingComponents();

        for (int i = siblingComponents.size(); --i >= 0;)
            siblingComponents.getUnchecked(i)->updatePosition();
    }
    else
    {
        siblingComponents.clear();
    }
}


void PaintElement::showPopupMenu()
{
    auto* commandManager = &ProjucerApplication::getCommandManager();

    PopupMenu m;

    m.addCommandItem (commandManager, JucerCommandIDs::toFront);
    m.addCommandItem (commandManager, JucerCommandIDs::toBack);
    m.addSeparator();

    if (owner->getSelectedElements().getNumSelected() > 1)
    {
        m.addCommandItem (commandManager, JucerCommandIDs::alignTop);
        m.addCommandItem (commandManager, JucerCommandIDs::alignRight);
        m.addCommandItem (commandManager, JucerCommandIDs::alignBottom);
        m.addCommandItem (commandManager, JucerCommandIDs::alignLeft);
        m.addSeparator();
    }

    m.addCommandItem (commandManager, StandardApplicationCommandIDs::cut);
    m.addCommandItem (commandManager, StandardApplicationCommandIDs::copy);
    m.addCommandItem (commandManager, StandardApplicationCommandIDs::paste);
    m.addCommandItem (commandManager, StandardApplicationCommandIDs::del);

    m.show();
}