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

   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.

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

namespace juce
{

MultiDocumentPanelWindow::MultiDocumentPanelWindow (Colour backgroundColour)
    : DocumentWindow (String(), backgroundColour,
                      DocumentWindow::maximiseButton | DocumentWindow::closeButton, false)
{
}

MultiDocumentPanelWindow::~MultiDocumentPanelWindow()
{
}

//==============================================================================
void MultiDocumentPanelWindow::maximiseButtonPressed()
{
    if (auto* owner = getOwner())
        owner->setLayoutMode (MultiDocumentPanel::MaximisedWindowsWithTabs);
    else
        jassertfalse; // these windows are only designed to be used inside a MultiDocumentPanel!
}

void MultiDocumentPanelWindow::closeButtonPressed()
{
    if (auto* owner = getOwner())
        owner->closeDocument (getContentComponent(), true);
    else
        jassertfalse; // these windows are only designed to be used inside a MultiDocumentPanel!
}

void MultiDocumentPanelWindow::activeWindowStatusChanged()
{
    DocumentWindow::activeWindowStatusChanged();
    updateOrder();
}

void MultiDocumentPanelWindow::broughtToFront()
{
    DocumentWindow::broughtToFront();
    updateOrder();
}

void MultiDocumentPanelWindow::updateOrder()
{
    if (auto* owner = getOwner())
        owner->updateOrder();
}

MultiDocumentPanel* MultiDocumentPanelWindow::getOwner() const noexcept
{
    return findParentComponentOfClass<MultiDocumentPanel>();
}

//==============================================================================
struct MultiDocumentPanel::TabbedComponentInternal   : public TabbedComponent
{
    TabbedComponentInternal() : TabbedComponent (TabbedButtonBar::TabsAtTop) {}

    void currentTabChanged (int, const String&) override
    {
        if (auto* owner = findParentComponentOfClass<MultiDocumentPanel>())
            owner->updateOrder();
    }
};


//==============================================================================
MultiDocumentPanel::MultiDocumentPanel()
{
    setOpaque (true);
}

MultiDocumentPanel::~MultiDocumentPanel()
{
    closeAllDocuments (false);
}

//==============================================================================
namespace MultiDocHelpers
{
    static bool shouldDeleteComp (Component* const c)
    {
        return c->getProperties() ["mdiDocumentDelete_"];
    }
}

bool MultiDocumentPanel::closeAllDocuments (const bool checkItsOkToCloseFirst)
{
    while (! components.isEmpty())
        if (! closeDocument (components.getLast(), checkItsOkToCloseFirst))
            return false;

    return true;
}

MultiDocumentPanelWindow* MultiDocumentPanel::createNewDocumentWindow()
{
    return new MultiDocumentPanelWindow (backgroundColour);
}

void MultiDocumentPanel::addWindow (Component* component)
{
    auto* dw = createNewDocumentWindow();

    dw->setResizable (true, false);
    dw->setContentNonOwned (component, true);
    dw->setName (component->getName());

    auto bkg = component->getProperties() ["mdiDocumentBkg_"];
    dw->setBackgroundColour (bkg.isVoid() ? backgroundColour : Colour ((uint32) static_cast<int> (bkg)));

    int x = 4;

    if (auto* topComp = getChildren().getLast())
        if (topComp->getX() == x && topComp->getY() == x)
            x += 16;

    dw->setTopLeftPosition (x, x);

    auto pos = component->getProperties() ["mdiDocumentPos_"];
    if (pos.toString().isNotEmpty())
        dw->restoreWindowStateFromString (pos.toString());

    addAndMakeVisible (dw);
    dw->toFront (true);
}

bool MultiDocumentPanel::addDocument (Component* const component,
                                      Colour docColour,
                                      const bool deleteWhenRemoved)
{
    // If you try passing a full DocumentWindow or ResizableWindow in here, you'll end up
    // with a frame-within-a-frame! Just pass in the bare content component.
    jassert (dynamic_cast<ResizableWindow*> (component) == nullptr);

    if (component == nullptr || (maximumNumDocuments > 0 && components.size() >= maximumNumDocuments))
        return false;

    components.add (component);
    component->getProperties().set ("mdiDocumentDelete_", deleteWhenRemoved);
    component->getProperties().set ("mdiDocumentBkg_", (int) docColour.getARGB());
    component->addComponentListener (this);

    if (mode == FloatingWindows)
    {
        if (isFullscreenWhenOneDocument())
        {
            if (components.size() == 1)
            {
                addAndMakeVisible (component);
            }
            else
            {
                if (components.size() == 2)
                    addWindow (components.getFirst());

                addWindow (component);
            }
        }
        else
        {
           addWindow (component);
        }
    }
    else
    {
        if (tabComponent == nullptr && components.size() > numDocsBeforeTabsUsed)
        {
            tabComponent.reset (new TabbedComponentInternal());
            addAndMakeVisible (tabComponent.get());

            auto temp = components;

            for (auto& c : temp)
                tabComponent->addTab (c->getName(), docColour, c, false);

            resized();
        }
        else
        {
            if (tabComponent != nullptr)
                tabComponent->addTab (component->getName(), docColour, component, false);
            else
                addAndMakeVisible (component);
        }

        setActiveDocument (component);
    }

    resized();
    activeDocumentChanged();
    return true;
}

bool MultiDocumentPanel::closeDocument (Component* component,
                                        const bool checkItsOkToCloseFirst)
{
    if (components.contains (component))
    {
        if (checkItsOkToCloseFirst && ! tryToCloseDocument (component))
            return false;

        component->removeComponentListener (this);

        const bool shouldDelete = MultiDocHelpers::shouldDeleteComp (component);
        component->getProperties().remove ("mdiDocumentDelete_");
        component->getProperties().remove ("mdiDocumentBkg_");

        if (mode == FloatingWindows)
        {
            for (auto* child : getChildren())
            {
                if (auto* dw = dynamic_cast<MultiDocumentPanelWindow*> (child))
                {
                    if (dw->getContentComponent() == component)
                    {
                        std::unique_ptr<MultiDocumentPanelWindow> (dw)->clearContentComponent();
                        break;
                    }
                }
            }

            if (shouldDelete)
                delete component;

            components.removeFirstMatchingValue (component);

            if (isFullscreenWhenOneDocument() && components.size() == 1)
            {
                for (int i = getNumChildComponents(); --i >= 0;)
                {
                    std::unique_ptr<MultiDocumentPanelWindow> dw (dynamic_cast<MultiDocumentPanelWindow*> (getChildComponent (i)));

                    if (dw != nullptr)
                        dw->clearContentComponent();
                }

                addAndMakeVisible (components.getFirst());
            }
        }
        else
        {
            jassert (components.indexOf (component) >= 0);

            if (tabComponent != nullptr)
            {
                for (int i = tabComponent->getNumTabs(); --i >= 0;)
                    if (tabComponent->getTabContentComponent (i) == component)
                        tabComponent->removeTab (i);
            }
            else
            {
                removeChildComponent (component);
            }

            if (shouldDelete)
                delete component;

            if (tabComponent != nullptr && tabComponent->getNumTabs() <= numDocsBeforeTabsUsed)
                tabComponent.reset();

            components.removeFirstMatchingValue (component);

            if (components.size() > 0 && tabComponent == nullptr)
                addAndMakeVisible (components.getFirst());
        }

        resized();

        // This ensures that the active tab is painted properly when a tab is closed!
        if (auto* activeComponent = getActiveDocument())
            setActiveDocument (activeComponent);

        activeDocumentChanged();
    }
    else
    {
        jassertfalse;
    }

    return true;
}

int MultiDocumentPanel::getNumDocuments() const noexcept
{
    return components.size();
}

Component* MultiDocumentPanel::getDocument (const int index) const noexcept
{
    return components [index];
}

Component* MultiDocumentPanel::getActiveDocument() const noexcept
{
    if (mode == FloatingWindows)
    {
        for (auto* child : getChildren())
            if (auto* dw = dynamic_cast<MultiDocumentPanelWindow*> (child))
                if (dw->isActiveWindow())
                    return dw->getContentComponent();
    }

    return components.getLast();
}

void MultiDocumentPanel::setActiveDocument (Component* component)
{
    jassert (component != nullptr);

    if (mode == FloatingWindows)
    {
        component = getContainerComp (component);

        if (component != nullptr)
            component->toFront (true);
    }
    else if (tabComponent != nullptr)
    {
        jassert (components.indexOf (component) >= 0);

        for (int i = tabComponent->getNumTabs(); --i >= 0;)
        {
            if (tabComponent->getTabContentComponent (i) == component)
            {
                tabComponent->setCurrentTabIndex (i);
                break;
            }
        }
    }
    else
    {
        component->grabKeyboardFocus();
    }
}

void MultiDocumentPanel::activeDocumentChanged()
{
}

void MultiDocumentPanel::setMaximumNumDocuments (const int newNumber)
{
    maximumNumDocuments = newNumber;
}

void MultiDocumentPanel::useFullscreenWhenOneDocument (const bool shouldUseTabs)
{
    numDocsBeforeTabsUsed = shouldUseTabs ? 1 : 0;
}

bool MultiDocumentPanel::isFullscreenWhenOneDocument() const noexcept
{
    return numDocsBeforeTabsUsed != 0;
}

//==============================================================================
void MultiDocumentPanel::setLayoutMode (const LayoutMode newLayoutMode)
{
    if (mode != newLayoutMode)
    {
        mode = newLayoutMode;

        if (mode == FloatingWindows)
        {
            tabComponent.reset();
        }
        else
        {
            for (int i = getNumChildComponents(); --i >= 0;)
            {
                std::unique_ptr<MultiDocumentPanelWindow> dw (dynamic_cast<MultiDocumentPanelWindow*> (getChildComponent (i)));

                if (dw != nullptr)
                {
                    dw->getContentComponent()->getProperties().set ("mdiDocumentPos_", dw->getWindowStateAsString());
                    dw->clearContentComponent();
                }
            }
        }

        resized();

        auto tempComps = components;
        components.clear();

        for (auto* c : tempComps)
            addDocument (c,
                         Colour ((uint32) static_cast<int> (c->getProperties().getWithDefault ("mdiDocumentBkg_", (int) Colours::white.getARGB()))),
                         MultiDocHelpers::shouldDeleteComp (c));
    }
}

void MultiDocumentPanel::setBackgroundColour (Colour newBackgroundColour)
{
    if (backgroundColour != newBackgroundColour)
    {
        backgroundColour = newBackgroundColour;
        setOpaque (newBackgroundColour.isOpaque());
        repaint();
    }
}

//==============================================================================
void MultiDocumentPanel::paint (Graphics& g)
{
    g.fillAll (backgroundColour);
}

void MultiDocumentPanel::resized()
{
    if (mode == MaximisedWindowsWithTabs || components.size() == numDocsBeforeTabsUsed)
    {
        for (auto* child : getChildren())
            child->setBounds (getLocalBounds());
    }

    setWantsKeyboardFocus (components.size() == 0);
}

Component* MultiDocumentPanel::getContainerComp (Component* c) const
{
    if (mode == FloatingWindows)
    {
        for (auto* child : getChildren())
            if (auto* dw = dynamic_cast<MultiDocumentPanelWindow*> (child))
                if (dw->getContentComponent() == c)
                    return dw;
    }

    return c;
}

void MultiDocumentPanel::componentNameChanged (Component&)
{
    if (mode == FloatingWindows)
    {
        for (auto* child : getChildren())
            if (auto* dw = dynamic_cast<MultiDocumentPanelWindow*> (child))
                dw->setName (dw->getContentComponent()->getName());
    }
    else if (tabComponent != nullptr)
    {
        for (int i = tabComponent->getNumTabs(); --i >= 0;)
            tabComponent->setTabName (i, tabComponent->getTabContentComponent (i)->getName());
    }
}

void MultiDocumentPanel::updateOrder()
{
    auto oldList = components;

    if (mode == FloatingWindows)
    {
        components.clear();

        for (auto* child : getChildren())
            if (auto* dw = dynamic_cast<MultiDocumentPanelWindow*> (child))
                components.add (dw->getContentComponent());
    }
    else
    {
        if (tabComponent != nullptr)
        {
            if (auto* current = tabComponent->getCurrentContentComponent())
            {
                components.removeFirstMatchingValue (current);
                components.add (current);
            }
        }
    }

    if (components != oldList)
        activeDocumentChanged();
}

} // namespace juce