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

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

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

namespace juce
{

const char* const Toolbar::toolbarDragDescriptor = "_toolbarItem_";

//==============================================================================
class Toolbar::Spacer final : public ToolbarItemComponent
{
public:
    Spacer (int itemID, float sizeToUse, bool shouldDrawBar)
        : ToolbarItemComponent (itemID, {}, false),
          fixedSize (sizeToUse),
          drawBar (shouldDrawBar)
    {
        setWantsKeyboardFocus (false);
    }

    bool getToolbarItemSizes (int toolbarThickness, bool /*isToolbarVertical*/,
                              int& preferredSize, int& minSize, int& maxSize) override
    {
        if (fixedSize <= 0)
        {
            preferredSize = toolbarThickness * 2;
            minSize = 4;
            maxSize = 32768;
        }
        else
        {
            maxSize = roundToInt ((float) toolbarThickness * fixedSize);
            minSize = drawBar ? maxSize : jmin (4, maxSize);
            preferredSize = maxSize;

            if (getEditingMode() == editableOnPalette)
                preferredSize = maxSize = toolbarThickness / (drawBar ? 3 : 2);
        }

        return true;
    }

    void paintButtonArea (Graphics&, int, int, bool, bool) override
    {
    }

    void contentAreaChanged (const Rectangle<int>&) override
    {
    }

    int getResizeOrder() const noexcept
    {
        return fixedSize <= 0 ? 0 : 1;
    }

    void paint (Graphics& g) override
    {
        auto w = getWidth();
        auto h = getHeight();

        if (drawBar)
        {
            g.setColour (findColour (Toolbar::separatorColourId, true));

            auto thickness = 0.2f;

            if (isToolbarVertical())
                g.fillRect ((float) w * 0.1f, (float) h * (0.5f - thickness * 0.5f), (float) w * 0.8f, (float) h * thickness);
            else
                g.fillRect ((float) w * (0.5f - thickness * 0.5f), (float) h * 0.1f, (float) w * thickness, (float) h * 0.8f);
        }

        if (getEditingMode() != normalMode && ! drawBar)
        {
            g.setColour (findColour (Toolbar::separatorColourId, true));

            auto indentX = jmin (2, (w - 3) / 2);
            auto indentY = jmin (2, (h - 3) / 2);
            g.drawRect (indentX, indentY, w - indentX * 2, h - indentY * 2, 1);

            if (fixedSize <= 0)
            {
                float x1, y1, x2, y2, x3, y3, x4, y4, hw, hl;

                if (isToolbarVertical())
                {
                    x1 = (float) w * 0.5f;
                    y1 = (float) h * 0.4f;
                    x2 = x1;
                    y2 = (float) indentX * 2.0f;

                    x3 = x1;
                    y3 = (float) h * 0.6f;
                    x4 = x1;
                    y4 = (float) h - y2;

                    hw = (float) w * 0.15f;
                    hl = (float) w * 0.2f;
                }
                else
                {
                    x1 = (float) w * 0.4f;
                    y1 = (float) h * 0.5f;
                    x2 = (float) indentX * 2.0f;
                    y2 = y1;

                    x3 = (float) w * 0.6f;
                    y3 = y1;
                    x4 = (float) w - x2;
                    y4 = y1;

                    hw = (float) h * 0.15f;
                    hl = (float) h * 0.2f;
                }

                Path p;
                p.addArrow ({ x1, y1, x2, y2 }, 1.5f, hw, hl);
                p.addArrow ({ x3, y3, x4, y4 }, 1.5f, hw, hl);
                g.fillPath (p);
            }
        }
    }

private:
    const float fixedSize;
    const bool drawBar;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Spacer)
};

//==============================================================================
class Toolbar::MissingItemsComponent final : public PopupMenu::CustomComponent
{
public:
    MissingItemsComponent (Toolbar& bar, int h)
        : PopupMenu::CustomComponent (true),
          owner (&bar),
          height (h)
    {
        for (int i = bar.items.size(); --i >= 0;)
        {
            auto* tc = bar.items.getUnchecked (i);

            if (tc != nullptr && dynamic_cast<Spacer*> (tc) == nullptr && ! tc->isVisible())
            {
                oldIndexes.insert (0, i);
                addAndMakeVisible (tc, 0);
            }
        }

        layout (400);
    }

    ~MissingItemsComponent() override
    {
        if (owner != nullptr)
        {
            for (int i = 0; i < getNumChildComponents(); ++i)
            {
                if (auto* tc = dynamic_cast<ToolbarItemComponent*> (getChildComponent (i)))
                {
                    tc->setVisible (false);
                    auto index = oldIndexes.removeAndReturn (i);
                    owner->addChildComponent (tc, index);
                    --i;
                }
            }

            owner->resized();
        }
    }

    void layout (const int preferredWidth)
    {
        const int indent = 8;
        auto x = indent;
        auto y = indent;
        int maxX = 0;

        for (auto* c : getChildren())
        {
            if (auto* tc = dynamic_cast<ToolbarItemComponent*> (c))
            {
                int preferredSize = 1, minSize = 1, maxSize = 1;

                if (tc->getToolbarItemSizes (height, false, preferredSize, minSize, maxSize))
                {
                    if (x + preferredSize > preferredWidth && x > indent)
                    {
                        x = indent;
                        y += height;
                    }

                    tc->setBounds (x, y, preferredSize, height);

                    x += preferredSize;
                    maxX = jmax (maxX, x);
                }
            }
        }

        setSize (maxX + 8, y + height + 8);
    }

    void getIdealSize (int& idealWidth, int& idealHeight) override
    {
        idealWidth = getWidth();
        idealHeight = getHeight();
    }

private:
    Component::SafePointer<Toolbar> owner;
    const int height;
    Array<int> oldIndexes;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MissingItemsComponent)
};


//==============================================================================
Toolbar::Toolbar()
{
    lookAndFeelChanged();
    initMissingItemButton();
}

Toolbar::~Toolbar()
{
    items.clear();
}

void Toolbar::setVertical (const bool shouldBeVertical)
{
    if (vertical != shouldBeVertical)
    {
        vertical = shouldBeVertical;
        resized();
    }
}

void Toolbar::clear()
{
    items.clear();
    resized();
}

ToolbarItemComponent* Toolbar::createItem (ToolbarItemFactory& factory, const int itemId)
{
    if (itemId == ToolbarItemFactory::separatorBarId)    return new Spacer (itemId, 0.1f, true);
    if (itemId == ToolbarItemFactory::spacerId)          return new Spacer (itemId, 0.5f, false);
    if (itemId == ToolbarItemFactory::flexibleSpacerId)  return new Spacer (itemId, 0.0f, false);

    return factory.createItem (itemId);
}

void Toolbar::addItemInternal (ToolbarItemFactory& factory,
                               const int itemId,
                               const int insertIndex)
{
    // An ID can't be zero - this might indicate a mistake somewhere?
    jassert (itemId != 0);

    if (auto* tc = createItem (factory, itemId))
    {
       #if JUCE_DEBUG
        Array<int> allowedIds;
        factory.getAllToolbarItemIds (allowedIds);

        // If your factory can create an item for a given ID, it must also return
        // that ID from its getAllToolbarItemIds() method!
        jassert (allowedIds.contains (itemId));
       #endif

        items.insert (insertIndex, tc);
        addAndMakeVisible (tc, insertIndex);
    }
}

void Toolbar::addItem (ToolbarItemFactory& factory, int itemId, int insertIndex)
{
    addItemInternal (factory, itemId, insertIndex);
    resized();
}

void Toolbar::addDefaultItems (ToolbarItemFactory& factoryToUse)
{
    Array<int> ids;
    factoryToUse.getDefaultItemSet (ids);

    clear();

    for (auto i : ids)
        addItemInternal (factoryToUse, i, -1);

    resized();
}

void Toolbar::removeToolbarItem (const int itemIndex)
{
    items.remove (itemIndex);
    resized();
}

ToolbarItemComponent* Toolbar::removeAndReturnItem (const int itemIndex)
{
    if (auto* tc = items.removeAndReturn (itemIndex))
    {
        removeChildComponent (tc);
        resized();
        return tc;
    }

    return nullptr;
}

int Toolbar::getNumItems() const noexcept
{
    return items.size();
}

int Toolbar::getItemId (const int itemIndex) const noexcept
{
    if (auto* tc = getItemComponent (itemIndex))
        return tc->getItemId();

    return 0;
}

ToolbarItemComponent* Toolbar::getItemComponent (const int itemIndex) const noexcept
{
    return items[itemIndex];
}

ToolbarItemComponent* Toolbar::getNextActiveComponent (int index, const int delta) const
{
    for (;;)
    {
        index += delta;

        if (auto* tc = getItemComponent (index))
        {
            if (tc->isActive)
                return tc;
        }
        else
        {
            return nullptr;
        }
    }
}

void Toolbar::setStyle (const ToolbarItemStyle& newStyle)
{
    if (toolbarStyle != newStyle)
    {
        toolbarStyle = newStyle;
        updateAllItemPositions (false);
    }
}

String Toolbar::toString() const
{
    String s ("TB:");

    for (int i = 0; i < getNumItems(); ++i)
        s << getItemId (i) << ' ';

    return s.trimEnd();
}

bool Toolbar::restoreFromString (ToolbarItemFactory& factoryToUse,
                                 const String& savedVersion)
{
    if (! savedVersion.startsWith ("TB:"))
        return false;

    StringArray tokens;
    tokens.addTokens (savedVersion.substring (3), false);

    clear();

    for (auto& t : tokens)
        addItemInternal (factoryToUse, t.getIntValue(), -1);

    resized();
    return true;
}

void Toolbar::paint (Graphics& g)
{
    getLookAndFeel().paintToolbarBackground (g, getWidth(), getHeight(), *this);
}

int Toolbar::getThickness() const noexcept
{
    return vertical ? getWidth() : getHeight();
}

int Toolbar::getLength() const noexcept
{
    return vertical ? getHeight() : getWidth();
}

void Toolbar::setEditingActive (const bool active)
{
    if (isEditingActive != active)
    {
        isEditingActive = active;
        updateAllItemPositions (false);
    }
}

//==============================================================================
void Toolbar::resized()
{
    updateAllItemPositions (false);
}

void Toolbar::updateAllItemPositions (bool animate)
{
    if (getWidth() > 0 && getHeight() > 0)
    {
        StretchableObjectResizer resizer;

        for (auto* tc : items)
        {
            tc->setEditingMode (isEditingActive ? ToolbarItemComponent::editableOnToolbar
                                                : ToolbarItemComponent::normalMode);

            tc->setStyle (toolbarStyle);

            auto* spacer = dynamic_cast<Spacer*> (tc);

            int preferredSize = 1, minSize = 1, maxSize = 1;

            if (tc->getToolbarItemSizes (getThickness(), isVertical(),
                                         preferredSize, minSize, maxSize))
            {
                tc->isActive = true;
                resizer.addItem (preferredSize, minSize, maxSize,
                                 spacer != nullptr ? spacer->getResizeOrder() : 2);
            }
            else
            {
                tc->isActive = false;
                tc->setVisible (false);
            }
        }

        resizer.resizeToFit (getLength());

        int totalLength = 0;

        for (int i = 0; i < resizer.getNumItems(); ++i)
            totalLength += (int) resizer.getItemSize (i);

        const bool itemsOffTheEnd = totalLength > getLength();

        auto extrasButtonSize = getThickness() / 2;
        missingItemsButton->setSize (extrasButtonSize, extrasButtonSize);
        missingItemsButton->setVisible (itemsOffTheEnd);
        missingItemsButton->setEnabled (! isEditingActive);

        if (vertical)
            missingItemsButton->setCentrePosition (getWidth() / 2,
                                                   getHeight() - 4 - extrasButtonSize / 2);
        else
            missingItemsButton->setCentrePosition (getWidth() - 4 - extrasButtonSize / 2,
                                                   getHeight() / 2);

        auto maxLength = itemsOffTheEnd ? (vertical ? missingItemsButton->getY()
                                                    : missingItemsButton->getX()) - 4
                                        : getLength();

        int pos = 0, activeIndex = 0;

        for (auto* tc : items)
        {
            if (tc->isActive)
            {
                auto size = (int) resizer.getItemSize (activeIndex++);

                Rectangle<int> newBounds;

                if (vertical)
                    newBounds.setBounds (0, pos, getWidth(), size);
                else
                    newBounds.setBounds (pos, 0, size, getHeight());

                auto& animator = Desktop::getInstance().getAnimator();

                if (animate)
                {
                    animator.animateComponent (tc, newBounds, 1.0f, 200, false, 3.0, 0.0);
                }
                else
                {
                    animator.cancelAnimation (tc, false);
                    tc->setBounds (newBounds);
                }

                pos += size;
                tc->setVisible (pos <= maxLength
                                 && ((! tc->isBeingDragged)
                                      || tc->getEditingMode() == ToolbarItemComponent::editableOnPalette));
            }
        }
    }
}

//==============================================================================
void Toolbar::initMissingItemButton()
{
    if (missingItemsButton == nullptr)
        return;

    addChildComponent (*missingItemsButton);
    missingItemsButton->setAlwaysOnTop (true);
    missingItemsButton->onClick = [this] { showMissingItems(); };
}

void Toolbar::showMissingItems()
{
    jassert (missingItemsButton->isShowing());

    if (missingItemsButton->isShowing())
    {
        PopupMenu m;
        auto comp = std::make_unique<MissingItemsComponent> (*this, getThickness());
        m.addCustomItem (1, std::move (comp), nullptr, TRANS ("Additional Items"));
        m.showMenuAsync (PopupMenu::Options().withTargetComponent (missingItemsButton.get()));
    }
}

//==============================================================================
bool Toolbar::isInterestedInDragSource (const SourceDetails& dragSourceDetails)
{
    return dragSourceDetails.description == toolbarDragDescriptor && isEditingActive;
}

void Toolbar::itemDragMove (const SourceDetails& dragSourceDetails)
{
    if (auto* tc = dynamic_cast<ToolbarItemComponent*> (dragSourceDetails.sourceComponent.get()))
    {
        if (! items.contains (tc))
        {
            if (tc->getEditingMode() == ToolbarItemComponent::editableOnPalette)
            {
                if (auto* palette = tc->findParentComponentOfClass<ToolbarItemPalette>())
                    palette->replaceComponent (*tc);
            }
            else
            {
                jassert (tc->getEditingMode() == ToolbarItemComponent::editableOnToolbar);
            }

            items.add (tc);
            addChildComponent (tc);
            updateAllItemPositions (true);
        }

        auto& animator = Desktop::getInstance().getAnimator();

        for (int i = getNumItems(); --i >= 0;)
        {
            auto currentIndex = items.indexOf (tc);
            auto newIndex = currentIndex;

            auto dragObjectLeft = vertical ? (dragSourceDetails.localPosition.getY() - tc->dragOffsetY)
                                           : (dragSourceDetails.localPosition.getX() - tc->dragOffsetX);
            auto dragObjectRight = dragObjectLeft + (vertical ? tc->getHeight() : tc->getWidth());

            auto current = animator.getComponentDestination (getChildComponent (newIndex));

            if (auto* prev = getNextActiveComponent (newIndex, -1))
            {
                auto previousPos = animator.getComponentDestination (prev);

                if (std::abs (dragObjectLeft - (vertical ? previousPos.getY() : previousPos.getX()))
                     < std::abs (dragObjectRight - (vertical ? current.getBottom() : current.getRight())))
                {
                    newIndex = getIndexOfChildComponent (prev);
                }
            }

            if (auto* next = getNextActiveComponent (newIndex, 1))
            {
                auto nextPos = animator.getComponentDestination (next);

                if (std::abs (dragObjectLeft - (vertical ? current.getY() : current.getX()))
                     > std::abs (dragObjectRight - (vertical ? nextPos.getBottom() : nextPos.getRight())))
                {
                    newIndex = getIndexOfChildComponent (next) + 1;
                }
            }

            if (newIndex == currentIndex)
                break;

            items.removeObject (tc, false);
            removeChildComponent (tc);
            addChildComponent (tc, newIndex);
            items.insert (newIndex, tc);
            updateAllItemPositions (true);
        }
    }
}

void Toolbar::itemDragExit (const SourceDetails& dragSourceDetails)
{
    if (auto* tc = dynamic_cast<ToolbarItemComponent*> (dragSourceDetails.sourceComponent.get()))
    {
        if (isParentOf (tc))
        {
            items.removeObject (tc, false);
            removeChildComponent (tc);
            updateAllItemPositions (true);
        }
    }
}

void Toolbar::itemDropped (const SourceDetails& dragSourceDetails)
{
    if (auto* tc = dynamic_cast<ToolbarItemComponent*> (dragSourceDetails.sourceComponent.get()))
        tc->setState (Button::buttonNormal);
}

void Toolbar::lookAndFeelChanged()
{
    missingItemsButton.reset (getLookAndFeel().createToolbarMissingItemsButton (*this));
    initMissingItemButton();
}

void Toolbar::mouseDown (const MouseEvent&) {}

//==============================================================================
class Toolbar::CustomisationDialog final : public DialogWindow
{
public:
    CustomisationDialog (ToolbarItemFactory& factory, SafePointer<Toolbar> bar, int optionFlags)
        : DialogWindow (TRANS ("Add/remove items from toolbar"),
                        bar->findColour (Toolbar::customisationDialogBackgroundColourId),
                        true,
                        true),
          toolbar (bar)
    {
        setContentOwned (new CustomiserPanel (factory, *toolbar, optionFlags), true);
        setResizable (true, true);
        setResizeLimits (400, 300, 1500, 1000);
        positionNearBar();
    }

    ~CustomisationDialog() override
    {
        if (toolbar != nullptr)
            toolbar->setEditingActive (false);
    }

    void closeButtonPressed() override
    {
        setVisible (false);
    }

    bool canModalEventBeSentToComponent (const Component* comp) override
    {
        return (toolbar != nullptr && toolbar->isParentOf (comp))
                 || dynamic_cast<const detail::ToolbarItemDragAndDropOverlayComponent*> (comp) != nullptr;
    }

    void positionNearBar()
    {
        if (toolbar == nullptr)
            return;

        auto screenSize = toolbar->getParentMonitorArea();
        auto pos = toolbar->getScreenPosition();
        const int gap = 8;

        if (toolbar->isVertical())
        {
            if (pos.x > screenSize.getCentreX())
                pos.x -= getWidth() - gap;
            else
                pos.x += toolbar->getWidth() + gap;
        }
        else
        {
            pos.x += (toolbar->getWidth() - getWidth()) / 2;

            if (pos.y > screenSize.getCentreY())
                pos.y -= getHeight() - gap;
            else
                pos.y += toolbar->getHeight() + gap;
        }

        setTopLeftPosition (pos);
    }

private:
    SafePointer<Toolbar> toolbar;

    class CustomiserPanel  : public Component
    {
    public:
        CustomiserPanel (ToolbarItemFactory& tbf, Toolbar& bar, int optionFlags)
           : factory (tbf), toolbar (bar), palette (tbf, bar),
             instructions ({}, TRANS ("You can drag the items above and drop them onto a toolbar to add them.")
                                 + "\n\n"
                                 + TRANS ("Items on the toolbar can also be dragged around to change their order, or dragged off the edge to delete them.")),
             defaultButton (TRANS ("Restore to default set of items"))
        {
            addAndMakeVisible (palette);

            if ((optionFlags & (Toolbar::allowIconsOnlyChoice
                                 | Toolbar::allowIconsWithTextChoice
                                 | Toolbar::allowTextOnlyChoice)) != 0)
            {
                addAndMakeVisible (styleBox);
                styleBox.setEditableText (false);

                if ((optionFlags & Toolbar::allowIconsOnlyChoice) != 0)     styleBox.addItem (TRANS ("Show icons only"), 1);
                if ((optionFlags & Toolbar::allowIconsWithTextChoice) != 0) styleBox.addItem (TRANS ("Show icons and descriptions"), 2);
                if ((optionFlags & Toolbar::allowTextOnlyChoice) != 0)      styleBox.addItem (TRANS ("Show descriptions only"), 3);

                int selectedStyle = 0;
                switch (bar.getStyle())
                {
                    case Toolbar::iconsOnly:      selectedStyle = 1; break;
                    case Toolbar::iconsWithText:  selectedStyle = 2; break;
                    case Toolbar::textOnly:       selectedStyle = 3; break;
                    default:                      break;
                }

                styleBox.setSelectedId (selectedStyle);

                styleBox.onChange = [this] { updateStyle(); };
            }

            if ((optionFlags & Toolbar::showResetToDefaultsButton) != 0)
            {
                addAndMakeVisible (defaultButton);
                defaultButton.onClick = [this] { toolbar.addDefaultItems (factory); };
            }

            addAndMakeVisible (instructions);
            instructions.setFont (withDefaultMetrics (FontOptions (13.0f)));

            setSize (500, 300);
        }

        void updateStyle()
        {
            switch (styleBox.getSelectedId())
            {
                case 1:   toolbar.setStyle (Toolbar::iconsOnly); break;
                case 2:   toolbar.setStyle (Toolbar::iconsWithText); break;
                case 3:   toolbar.setStyle (Toolbar::textOnly); break;
                default:  break;
            }

            palette.resized(); // to make it update the styles
        }

        void paint (Graphics& g) override
        {
            Colour background;

            if (auto* dw = findParentComponentOfClass<DialogWindow>())
                background = dw->getBackgroundColour();

            g.setColour (background.contrasting().withAlpha (0.3f));
            g.fillRect (palette.getX(), palette.getBottom() - 1, palette.getWidth(), 1);
        }

        void resized() override
        {
            palette.setBounds (0, 0, getWidth(), getHeight() - 120);
            styleBox.setBounds (10, getHeight() - 110, 200, 22);

            defaultButton.changeWidthToFitText (22);
            defaultButton.setTopLeftPosition (240, getHeight() - 110);

            instructions.setBounds (10, getHeight() - 80, getWidth() - 20, 80);
        }

    private:
        ToolbarItemFactory& factory;
        Toolbar& toolbar;

        ToolbarItemPalette palette;
        Label instructions;
        ComboBox styleBox;
        TextButton defaultButton;
    };
};

void Toolbar::showCustomisationDialog (ToolbarItemFactory& factory, const int optionFlags)
{
    setEditingActive (true);

    (new CustomisationDialog (factory, this, optionFlags))
        ->enterModalState (true, nullptr, true);
}

//==============================================================================
std::unique_ptr<AccessibilityHandler> Toolbar::createAccessibilityHandler()
{
    return std::make_unique<AccessibilityHandler> (*this, AccessibilityRole::group);
}

} // namespace juce