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

   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.

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

namespace juce
{

namespace TabbedComponentHelpers
{
    const Identifier deleteComponentId ("deleteByTabComp_");

    static void deleteIfNecessary (Component* comp)
    {
        if (comp != nullptr && (bool) comp->getProperties() [deleteComponentId])
            delete comp;
    }

    static Rectangle<int> getTabArea (Rectangle<int>& content, BorderSize<int>& outline,
                                      TabbedButtonBar::Orientation orientation, int tabDepth)
    {
        switch (orientation)
        {
            case TabbedButtonBar::TabsAtTop:    outline.setTop (0);     return content.removeFromTop (tabDepth);
            case TabbedButtonBar::TabsAtBottom: outline.setBottom (0);  return content.removeFromBottom (tabDepth);
            case TabbedButtonBar::TabsAtLeft:   outline.setLeft (0);    return content.removeFromLeft (tabDepth);
            case TabbedButtonBar::TabsAtRight:  outline.setRight (0);   return content.removeFromRight (tabDepth);
            default: jassertfalse; break;
        }

        return Rectangle<int>();
    }
}

//==============================================================================
struct TabbedComponent::ButtonBar  : public TabbedButtonBar
{
    ButtonBar (TabbedComponent& tabComp, TabbedButtonBar::Orientation o)
        : TabbedButtonBar (o), owner (tabComp)
    {
    }

    void currentTabChanged (int newCurrentTabIndex, const String& newTabName)
    {
        owner.changeCallback (newCurrentTabIndex, newTabName);
    }

    void popupMenuClickOnTab (int tabIndex, const String& tabName)
    {
        owner.popupMenuClickOnTab (tabIndex, tabName);
    }

    Colour getTabBackgroundColour (int tabIndex)
    {
        return owner.tabs->getTabBackgroundColour (tabIndex);
    }

    TabBarButton* createTabButton (const String& tabName, int tabIndex)
    {
        return owner.createTabButton (tabName, tabIndex);
    }

    TabbedComponent& owner;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ButtonBar)
};

//==============================================================================
TabbedComponent::TabbedComponent (TabbedButtonBar::Orientation orientation)
{
    tabs.reset (new ButtonBar (*this, orientation));
    addAndMakeVisible (tabs.get());
}

TabbedComponent::~TabbedComponent()
{
    clearTabs();
    tabs.reset();
}

//==============================================================================
void TabbedComponent::setOrientation (TabbedButtonBar::Orientation orientation)
{
    tabs->setOrientation (orientation);
    resized();
}

TabbedButtonBar::Orientation TabbedComponent::getOrientation() const noexcept
{
    return tabs->getOrientation();
}

void TabbedComponent::setTabBarDepth (int newDepth)
{
    if (tabDepth != newDepth)
    {
        tabDepth = newDepth;
        resized();
    }
}

TabBarButton* TabbedComponent::createTabButton (const String& tabName, int /*tabIndex*/)
{
    return new TabBarButton (tabName, *tabs);
}

//==============================================================================
void TabbedComponent::clearTabs()
{
    if (panelComponent != nullptr)
    {
        panelComponent->setVisible (false);
        removeChildComponent (panelComponent.get());
        panelComponent = nullptr;
    }

    tabs->clearTabs();

    for (int i = contentComponents.size(); --i >= 0;)
        TabbedComponentHelpers::deleteIfNecessary (contentComponents.getReference (i));

    contentComponents.clear();
}

void TabbedComponent::addTab (const String& tabName,
                              Colour tabBackgroundColour,
                              Component* contentComponent,
                              bool deleteComponentWhenNotNeeded,
                              int insertIndex)
{
    contentComponents.insert (insertIndex, WeakReference<Component> (contentComponent));

    if (deleteComponentWhenNotNeeded && contentComponent != nullptr)
        contentComponent->getProperties().set (TabbedComponentHelpers::deleteComponentId, true);

    tabs->addTab (tabName, tabBackgroundColour, insertIndex);
    resized();
}

void TabbedComponent::setTabName (int tabIndex, const String& newName)
{
    tabs->setTabName (tabIndex, newName);
}

void TabbedComponent::removeTab (int tabIndex)
{
    if (isPositiveAndBelow (tabIndex, contentComponents.size()))
    {
        TabbedComponentHelpers::deleteIfNecessary (contentComponents.getReference (tabIndex).get());
        contentComponents.remove (tabIndex);
        tabs->removeTab (tabIndex);
    }
}

void TabbedComponent::moveTab (int currentIndex, int newIndex, bool animate)
{
    contentComponents.move (currentIndex, newIndex);
    tabs->moveTab (currentIndex, newIndex, animate);
}

int TabbedComponent::getNumTabs() const
{
    return tabs->getNumTabs();
}

StringArray TabbedComponent::getTabNames() const
{
    return tabs->getTabNames();
}

Component* TabbedComponent::getTabContentComponent (int tabIndex) const noexcept
{
    return contentComponents[tabIndex].get();
}

Colour TabbedComponent::getTabBackgroundColour (int tabIndex) const noexcept
{
    return tabs->getTabBackgroundColour (tabIndex);
}

void TabbedComponent::setTabBackgroundColour (int tabIndex, Colour newColour)
{
    tabs->setTabBackgroundColour (tabIndex, newColour);

    if (getCurrentTabIndex() == tabIndex)
        repaint();
}

void TabbedComponent::setCurrentTabIndex (int newTabIndex, bool sendChangeMessage)
{
    tabs->setCurrentTabIndex (newTabIndex, sendChangeMessage);
}

int TabbedComponent::getCurrentTabIndex() const
{
    return tabs->getCurrentTabIndex();
}

String TabbedComponent::getCurrentTabName() const
{
    return tabs->getCurrentTabName();
}

void TabbedComponent::setOutline (int thickness)
{
    outlineThickness = thickness;
    resized();
    repaint();
}

void TabbedComponent::setIndent (int indentThickness)
{
    edgeIndent = indentThickness;
    resized();
    repaint();
}

void TabbedComponent::paint (Graphics& g)
{
    g.fillAll (findColour (backgroundColourId));

    auto content = getLocalBounds();
    BorderSize<int> outline (outlineThickness);
    TabbedComponentHelpers::getTabArea (content, outline, getOrientation(), tabDepth);

    g.reduceClipRegion (content);
    g.fillAll (tabs->getTabBackgroundColour (getCurrentTabIndex()));

    if (outlineThickness > 0)
    {
        RectangleList<int> rl (content);
        rl.subtract (outline.subtractedFrom (content));

        g.reduceClipRegion (rl);
        g.fillAll (findColour (outlineColourId));
    }
}

void TabbedComponent::resized()
{
    auto content = getLocalBounds();
    BorderSize<int> outline (outlineThickness);

    tabs->setBounds (TabbedComponentHelpers::getTabArea (content, outline, getOrientation(), tabDepth));
    content = BorderSize<int> (edgeIndent).subtractedFrom (outline.subtractedFrom (content));

    for (auto& c : contentComponents)
        if (auto comp = c.get())
            comp->setBounds (content);
}

void TabbedComponent::lookAndFeelChanged()
{
    for (auto& c : contentComponents)
        if (auto comp = c.get())
          comp->lookAndFeelChanged();
}

void TabbedComponent::changeCallback (int newCurrentTabIndex, const String& newTabName)
{
    auto* newPanelComp = getTabContentComponent (getCurrentTabIndex());

    if (newPanelComp != panelComponent)
    {
        if (panelComponent != nullptr)
        {
            panelComponent->setVisible (false);
            removeChildComponent (panelComponent);
        }

        panelComponent = newPanelComp;

        if (panelComponent != nullptr)
        {
            // do these ops as two stages instead of addAndMakeVisible() so that the
            // component has always got a parent when it gets the visibilityChanged() callback
            addChildComponent (panelComponent);
            panelComponent->sendLookAndFeelChange();
            panelComponent->setVisible (true);
            panelComponent->toFront (true);
        }

        repaint();
    }

    resized();
    currentTabChanged (newCurrentTabIndex, newTabName);
}

void TabbedComponent::currentTabChanged (int, const String&) {}
void TabbedComponent::popupMenuClickOnTab (int, const String&) {}

} // namespace juce