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

   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-9-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.

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

#pragma once

//==============================================================================
class ConcertinaHeader final : public Component,
                               public ChangeBroadcaster
{
public:
    ConcertinaHeader (String n, Path p)
        : Component (n), name (n), iconPath (p)
    {
        setTitle (getName());

        panelIcon = Icon (iconPath, Colours::white);

        nameLabel.setText (name, dontSendNotification);
        nameLabel.setJustificationType (Justification::centredLeft);
        nameLabel.setInterceptsMouseClicks (false, false);
        nameLabel.setAccessible (false);
        nameLabel.setColour (Label::textColourId, Colours::white);

        addAndMakeVisible (nameLabel);
    }

    void resized() override
    {
        auto b = getLocalBounds().toFloat();

        iconBounds = b.removeFromLeft (b.getHeight()).reduced (7, 7);
        arrowBounds = b.removeFromRight (b.getHeight());
        nameLabel.setBounds (b.toNearestInt());
    }

    void paint (Graphics& g) override
    {
        g.setColour (findColour (defaultButtonBackgroundColourId));
        g.fillRoundedRectangle (getLocalBounds().reduced (2, 3).toFloat(), 2.0f);

        g.setColour (Colours::white);
        g.fillPath (ProjucerLookAndFeel::getArrowPath (arrowBounds,
                                                       getParentComponent()->getBoundsInParent().getY() == yPosition ? 2 : 0,
                                                       true, Justification::centred));

        panelIcon.draw (g, iconBounds.toFloat(), false);
    }

    void mouseUp (const MouseEvent& e) override
    {
        if (! e.mouseWasDraggedSinceMouseDown())
            sendChangeMessage();
    }

    std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
    {
        return std::make_unique<AccessibilityHandler> (*this,
                                                       AccessibilityRole::button,
                                                       AccessibilityActions().addAction (AccessibilityActionType::press,
                                                                                         [this] { sendChangeMessage(); }));
    }

    int direction = 0;
    int yPosition = 0;

private:
    String name;
    Label nameLabel;

    Path iconPath;
    Icon panelIcon;

    Rectangle<float> arrowBounds, iconBounds;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ConcertinaHeader)
};

//==============================================================================
class FindPanel final : public Component,
                        private Timer,
                        private FocusChangeListener
{
public:
    FindPanel (std::function<void (const String&)> cb)
        : callback (cb)
    {
        addAndMakeVisible (editor);
        editor.onTextChange = [this] { startTimer (250); };
        editor.onFocusLost  = [this]
        {
            isFocused = false;
            repaint();
        };

        Desktop::getInstance().addFocusChangeListener (this);

        lookAndFeelChanged();
    }

    ~FindPanel() override
    {
        Desktop::getInstance().removeFocusChangeListener (this);
    }

    void paintOverChildren (Graphics& g) override
    {
        if (! isFocused)
            return;

        g.setColour (findColour (defaultHighlightColourId));

        Path p;
        p.addRoundedRectangle (getLocalBounds().reduced (2), 3.0f);
        g.strokePath (p, PathStrokeType (2.0f));
    }


    void resized() override
    {
        editor.setBounds (getLocalBounds().reduced (2));
    }

private:
    TextEditor editor;
    bool isFocused = false;
    std::function<void (const String&)> callback;

    //==============================================================================
    void lookAndFeelChanged() override
    {
        editor.setTextToShowWhenEmpty ("Filter...", findColour (widgetTextColourId).withAlpha (0.3f));
    }

    void globalFocusChanged (Component* focusedComponent) override
    {
        if (focusedComponent == &editor)
        {
            isFocused = true;
            repaint();
        }
    }

    void timerCallback() override
    {
        stopTimer();
        callback (editor.getText());
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (FindPanel)
};

//==============================================================================
class ConcertinaTreeComponent final : public Component
{
public:
    class AdditionalComponents
    {
    public:
        enum Type
        {
            addButton      = (1 << 0),
            settingsButton = (1 << 1),
            findPanel      = (1 << 2)
        };

        [[nodiscard]] AdditionalComponents with (Type t)
        {
            auto copy = *this;
            copy.componentTypes |= t;

            return copy;
        }

        bool has (Type t) const noexcept
        {
            return (componentTypes & t) != 0;
        }

    private:
        int componentTypes = 0;
    };

    ConcertinaTreeComponent (const String& name,
                             TreePanelBase* tree,
                             AdditionalComponents additionalComponents)
         : Component (name),
           treeToDisplay (tree)
    {
        setTitle (getName());
        setFocusContainerType (FocusContainerType::focusContainer);

        if (additionalComponents.has (AdditionalComponents::addButton))
        {
            addButton = std::make_unique<IconButton> ("Add", getIcons().plus);
            addAndMakeVisible (addButton.get());
            addButton->onClick = [this] { showAddMenu(); };
        }

        if (additionalComponents.has (AdditionalComponents::settingsButton))
        {
            settingsButton = std::make_unique<IconButton> ("Settings", getIcons().settings);
            addAndMakeVisible (settingsButton.get());
            settingsButton->onClick = [this] { showSettings(); };
        }

        if (additionalComponents.has (AdditionalComponents::findPanel))
        {
            findPanel = std::make_unique<FindPanel> ([this] (const String& filter) { treeToDisplay->rootItem->setSearchFilter (filter); });
            addAndMakeVisible (findPanel.get());
        }

        addAndMakeVisible (treeToDisplay.get());
    }

    void resized() override
    {
        auto bounds = getLocalBounds();

        if (addButton != nullptr || settingsButton != nullptr || findPanel != nullptr)
        {
            auto bottomSlice = bounds.removeFromBottom (25);
            bottomSlice.removeFromRight (3);

            if (addButton != nullptr)
                addButton->setBounds (bottomSlice.removeFromRight (25).reduced (2));

            if (settingsButton != nullptr)
                settingsButton->setBounds (bottomSlice.removeFromRight (25).reduced (2));

            if (findPanel != nullptr)
                findPanel->setBounds (bottomSlice.reduced (2));
        }

        treeToDisplay->setBounds (bounds);
    }

    TreePanelBase* getTree() const noexcept    { return treeToDisplay.get(); }

private:
    std::unique_ptr<TreePanelBase> treeToDisplay;
    std::unique_ptr<IconButton> addButton, settingsButton;
    std::unique_ptr<FindPanel> findPanel;

    void showAddMenu()
    {
        auto numSelected = treeToDisplay->tree.getNumSelectedItems();

        if (numSelected > 1)
            return;

        if (numSelected == 0)
        {
            if (auto* root = dynamic_cast<JucerTreeViewBase*> (treeToDisplay->tree.getRootItem()))
                root->showPopupMenu (addButton->getScreenBounds().getCentre());
        }
        else
        {
            if (auto* item = dynamic_cast<JucerTreeViewBase*> (treeToDisplay->tree.getSelectedItem (0)))
                item->showAddMenu (addButton->getScreenBounds().getCentre());
        }
    }

    void showSettings()
    {
        if (auto* root = dynamic_cast<JucerTreeViewBase*> (treeToDisplay->tree.getRootItem()))
        {
            treeToDisplay->tree.clearSelectedItems();
            root->showDocument();
        }
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ConcertinaTreeComponent)
};


//==============================================================================
struct ProjectSettingsComponent final : public Component,
                                        private ChangeListener
{
    ProjectSettingsComponent (Project& p)
        : project (p),
          group (project.getProjectFilenameRootString(),
                 Icon (getIcons().settings, Colours::transparentBlack))
    {
        setTitle ("Project Settings");
        setFocusContainerType (FocusContainerType::focusContainer);

        addAndMakeVisible (group);

        updatePropertyList();
        project.addChangeListener (this);
    }

    ~ProjectSettingsComponent() override
    {
        project.removeChangeListener (this);
    }

    void resized() override
    {
        group.updateSize (12, 0, getWidth() - 24);
        group.setBounds (getLocalBounds().reduced (12, 0));
    }

    void updatePropertyList()
    {
        PropertyListBuilder props;
        project.createPropertyEditors (props);
        group.setProperties (props);
        group.setName ("Project Settings");

        parentSizeChanged();
    }

    void changeListenerCallback (ChangeBroadcaster*) override
    {
        const auto next = getProjectStatesRequiringRebuild();

        if (std::exchange (states, next) != next)
            updatePropertyList();
    }

    void parentSizeChanged() override
    {
        auto width = jmax (550, getParentWidth());
        auto y = group.updateSize (12, 0, width - 12);

        y = jmax (getParentHeight(), y);

        setSize (width, y);
    }

    struct StatesRequiringPropertyRebuild
    {
        var projectType;
        var enableARA;

        bool operator== (const StatesRequiringPropertyRebuild& other) const
        {
            const auto tie = [] (auto& x) { return std::tuple (x.projectType, x.enableARA); };
            return tie (*this) == tie (other);
        }

        bool operator!= (const StatesRequiringPropertyRebuild& other) const
        {
            return ! operator== (other);
        }
    };

    StatesRequiringPropertyRebuild getProjectStatesRequiringRebuild() const
    {
        return { project.getProjectTypeString(), project.shouldEnableARA() };
    }

    Project& project;
    StatesRequiringPropertyRebuild states = getProjectStatesRequiringRebuild();
    PropertyGroupComponent group;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ProjectSettingsComponent)
};

//==============================================================================
struct FileTreePanel final : public TreePanelBase
{
    FileTreePanel (Project& p)
        : TreePanelBase (&p, "fileTreeState")
    {
        tree.setMultiSelectEnabled (true);
        setRoot (std::make_unique<TreeItemTypes::GroupItem> (p.getMainGroup()));
        tree.setRootItemVisible (false);
    }

    void updateMissingFileStatuses()
    {
        if (auto* p = dynamic_cast<TreeItemTypes::FileTreeItemBase*> (rootItem.get()))
            p->checkFileStatus();
    }
};

struct ModuleTreePanel final : public TreePanelBase
{
    ModuleTreePanel (Project& p)
        : TreePanelBase (&p, "moduleTreeState")
    {
        tree.setMultiSelectEnabled (false);
        setRoot (std::make_unique<TreeItemTypes::EnabledModulesItem> (p));
        tree.setRootItemVisible (false);
    }
};

struct ExportersTreePanel final : public TreePanelBase
{
    ExportersTreePanel (Project& p)
        : TreePanelBase (&p, "exportersTreeState")
    {
        tree.setMultiSelectEnabled (false);
        setRoot (std::make_unique<TreeItemTypes::ExportersTreeRoot> (p));
        tree.setRootItemVisible (false);
    }
};

//==============================================================================
class Sidebar final : public Component,
                      private ChangeListener
{
public:
    Sidebar (Project* p)
        : project (p)
    {
        setFocusContainerType (FocusContainerType::focusContainer);

        if (project != nullptr)
            buildConcertina();
    }

    ~Sidebar() override
    {
        TreePanelBase* panels[] = { getFileTreePanel(), getModuleTreePanel(), getExportersTreePanel() };

        for (auto* panel : panels)
            if (panel != nullptr)
                panel->saveOpenness();
    }

    void paint (Graphics& g) override
    {
        g.fillAll (findColour (secondaryBackgroundColourId));
    }

    void resized() override
    {
        concertinaPanel.setBounds (getLocalBounds().withTrimmedBottom (3));
    }

    TreePanelBase* getTreeWithSelectedItems()
    {
        for (auto i = concertinaPanel.getNumPanels() - 1; i >= 0; --i)
        {
            if (auto* treeComponent = dynamic_cast<ConcertinaTreeComponent*> (concertinaPanel.getPanel (i)))
            {
                if (auto* base = treeComponent->getTree())
                    if (base->tree.getNumSelectedItems() != 0)
                        return base;
            }
        }

        return nullptr;
    }

    FileTreePanel*      getFileTreePanel()        { return getPanel<FileTreePanel>      (0); }
    ModuleTreePanel*    getModuleTreePanel()      { return getPanel<ModuleTreePanel>    (1); }
    ExportersTreePanel* getExportersTreePanel()   { return getPanel<ExportersTreePanel> (2); }

    void showPanel (int panelIndex)
    {
        jassert (isPositiveAndBelow (panelIndex, concertinaPanel.getNumPanels()));

        concertinaPanel.expandPanelFully (concertinaPanel.getPanel (panelIndex), true);
    }

private:
    //==============================================================================
    template <typename PanelType>
    PanelType* getPanel (int panelIndex)
    {
        if (auto* panel = dynamic_cast<ConcertinaTreeComponent*> (concertinaPanel.getPanel (panelIndex)))
            return dynamic_cast<PanelType*> (panel->getTree());

        return nullptr;
    }

    void changeListenerCallback (ChangeBroadcaster* source) override
    {
        const auto pointerMatches = [source] (const std::unique_ptr<ConcertinaHeader>& header) { return header.get() == source; };
        const auto it = std::find_if (headers.begin(), headers.end(), pointerMatches);
        const auto index = (int) std::distance (headers.begin(), it);

        if (index != (int) headers.size())
            concertinaPanel.expandPanelFully (concertinaPanel.getPanel (index), true);
    }

    void buildConcertina()
    {
        for (auto i = concertinaPanel.getNumPanels() - 1; i >= 0 ; --i)
            concertinaPanel.removePanel (concertinaPanel.getPanel (i));

        headers.clear();

        auto addPanel = [this] (const String& name,
                                TreePanelBase* tree,
                                ConcertinaTreeComponent::AdditionalComponents components,
                                const Path& icon)
        {
            if (project != nullptr)
                concertinaPanel.addPanel (-1, new ConcertinaTreeComponent (name, tree, components), true);

            headers.push_back (std::make_unique<ConcertinaHeader> (name, icon));
        };

        using AdditionalComponents = ConcertinaTreeComponent::AdditionalComponents;

        addPanel ("File Explorer", new FileTreePanel (*project),
                  AdditionalComponents{}
                      .with (AdditionalComponents::addButton)
                      .with (AdditionalComponents::findPanel),
                  getIcons().fileExplorer);

        addPanel ("Modules", new ModuleTreePanel (*project),
                  AdditionalComponents{}
                      .with (AdditionalComponents::addButton)
                      .with (AdditionalComponents::settingsButton),
                  getIcons().modules);

        addPanel ("Exporters", new ExportersTreePanel (*project),
                  AdditionalComponents{}.with (AdditionalComponents::addButton),
                  getIcons().exporter);

        for (int i = 0; i < concertinaPanel.getNumPanels(); ++i)
        {
            auto* p = concertinaPanel.getPanel (i);
            auto* h = headers[(size_t) i].get();
            p->addMouseListener (this, true);

            h->addChangeListener (this);
            h->yPosition = i * 30;

            concertinaPanel.setCustomPanelHeader (p, h, false);
            concertinaPanel.setPanelHeaderSize (p, 30);
        }

        addAndMakeVisible (concertinaPanel);
    }

    void mouseDown (const MouseEvent& e) override
    {
        for (auto i = concertinaPanel.getNumPanels() - 1; i >= 0; --i)
        {
            if (auto* p = concertinaPanel.getPanel (i))
            {
                if (! (p->isParentOf (e.eventComponent)))
                {
                    auto* base = dynamic_cast<TreePanelBase*> (p);

                    if (base == nullptr)
                        if (auto* concertina = dynamic_cast<ConcertinaTreeComponent*> (p))
                            base = concertina->getTree();

                    if (base != nullptr)
                        base->tree.clearSelectedItems();
                }
            }
        }
    }

    //==============================================================================
    std::vector<std::unique_ptr<ConcertinaHeader>> headers;
    ConcertinaPanel concertinaPanel;
    Project* project = nullptr;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Sidebar)
};
