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

   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.

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

#pragma once

#include "../../Application/jucer_CommonHeaders.h"
#include "../../Application/jucer_Application.h"

//==============================================================================
class MessagesPopupWindow final : public Component,
                                  private ComponentMovementWatcher
{
public:
    MessagesPopupWindow (Component& target, Component& parent, Project& project)
        : ComponentMovementWatcher (&parent),
          targetComponent (target),
          parentComponent (parent),
          messagesListComponent (*this, project)
    {
        parentComponent.addAndMakeVisible (this);
        setAlwaysOnTop (true);

        addAndMakeVisible (viewport);
        viewport.setScrollBarsShown (true, false);
        viewport.setViewedComponent (&messagesListComponent, false);
        viewport.setWantsKeyboardFocus (false);

        setOpaque (true);
    }

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

    void resized() override
    {
        viewport.setBounds (getLocalBounds());
    }

    bool isListShowing() const
    {
        return messagesListComponent.getRequiredHeight() > 0;
    }

    void updateBounds (bool animate)
    {
        auto targetBounds = parentComponent.getLocalArea (&targetComponent, targetComponent.getLocalBounds());

        auto height = jmin (messagesListComponent.getRequiredHeight(), maxHeight);
        auto yPos = jmax (indent, targetBounds.getY() - height);

        Rectangle<int> bounds (targetBounds.getX(), yPos,
                               jmin (width, parentComponent.getWidth() - targetBounds.getX() - indent), targetBounds.getY() - yPos);

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

        if (animate)
        {
            setBounds (bounds.withY (targetBounds.getY()));
            animator.animateComponent (this, bounds, 1.0f, 150, false, 1.0, 1.0);
        }
        else
        {
            if (animator.isAnimating (this))
                animator.cancelAnimation (this, false);

            setBounds (bounds);
        }

        messagesListComponent.resized();
    }

private:
    //==============================================================================
    class MessagesListComponent final : public Component,
                                        private ValueTree::Listener,
                                        private AsyncUpdater
    {
    public:
        MessagesListComponent (MessagesPopupWindow& o, Project& currentProject)
            : owner (o),
              project (currentProject)
        {
            messagesTree = project.getProjectMessages();
            messagesTree.addListener (this);

            setOpaque (true);

            messagesChanged();
        }

        void resized() override
        {
            auto bounds = getLocalBounds();
            auto numMessages = messages.size();

            for (size_t i = 0; i < numMessages; ++i)
            {
                messages[i]->setBounds (bounds.removeFromTop (messageHeight));

                if (numMessages > 1 && i != (numMessages - 1))
                    bounds.removeFromTop (messageSpacing);
            }
        }

        void paint (Graphics& g) override
        {
            g.fillAll (findColour (backgroundColourId).contrasting (0.2f));
        }

        int getRequiredHeight() const
        {
            auto numMessages = (int) messages.size();

            if (numMessages > 0)
                return (numMessages * messageHeight) + ((numMessages - 1) * messageSpacing);

            return 0;
        }

        void updateSize (int parentWidth)
        {
            setSize (parentWidth, getRequiredHeight());
        }

    private:
        static constexpr int messageHeight = 65;
        static constexpr int messageSpacing = 2;

        //==============================================================================
        struct MessageComponent final : public Component
        {
            MessageComponent (MessagesListComponent& listComponent,
                              const Identifier& messageToDisplay,
                              std::vector<ProjectMessages::MessageAction> messageActions)
               : message (messageToDisplay)
            {
                for (auto& action : messageActions)
                {
                    auto button = std::make_unique<TextButton> (action.first);
                    addAndMakeVisible (*button);
                    button->onClick = action.second;

                    buttons.push_back (std::move (button));
                }

                icon = (ProjectMessages::getTypeForMessage (message) == ProjectMessages::Ids::warning ? getIcons().warning : getIcons().info);

                messageTitleLabel.setText (ProjectMessages::getTitleForMessage (message), dontSendNotification);
                messageTitleLabel.setFont (FontOptions { 11.0f, Font::bold });
                addAndMakeVisible (messageTitleLabel);

                messageDescriptionLabel.setText (ProjectMessages::getDescriptionForMessage (message), dontSendNotification);
                messageDescriptionLabel.setFont (FontOptions (11.0f));
                messageDescriptionLabel.setJustificationType (Justification::topLeft);
                addAndMakeVisible (messageDescriptionLabel);

                dismissButton.setShape (getLookAndFeel().getCrossShape (1.0f), false, true, false);
                addAndMakeVisible (dismissButton);

                dismissButton.onClick = [this, &listComponent]
                {
                    listComponent.messagesTree.getChildWithName (ProjectMessages::getTypeForMessage (message))
                                              .getChildWithName (message)
                                              .setProperty (ProjectMessages::Ids::isVisible, false, nullptr);
                };
            }

            void paint (Graphics& g) override
            {
                g.fillAll (findColour (secondaryBackgroundColourId).contrasting (0.1f));

                auto bounds = getLocalBounds().reduced (5);

                g.setColour (findColour (defaultIconColourId));
                g.fillPath (icon, icon.getTransformToScaleToFit (bounds.removeFromTop (messageTitleHeight)
                                                                       .removeFromLeft (messageTitleHeight).toFloat(), true));
            }

            void resized() override
            {
                auto bounds = getLocalBounds().reduced (5);

                auto topSlice = bounds.removeFromTop (messageTitleHeight);

                topSlice.removeFromLeft (messageTitleHeight + 5);
                topSlice.removeFromRight (5);

                dismissButton.setBounds (topSlice.removeFromRight (messageTitleHeight));
                messageTitleLabel.setBounds (topSlice);
                bounds.removeFromTop (5);

                auto numButtons = (int) buttons.size();

                if (numButtons > 0)
                {
                    auto buttonBounds = bounds.removeFromBottom (buttonHeight);

                    auto buttonWidth = roundToInt ((float) buttonBounds.getWidth() / 3.5f);
                    auto requiredWidth = (numButtons * buttonWidth) + ((numButtons - 1) * buttonSpacing);
                    buttonBounds.reduce ((buttonBounds.getWidth() - requiredWidth) / 2, 0);

                    for (auto& b : buttons)
                    {
                        b->setBounds (buttonBounds.removeFromLeft (buttonWidth));
                        buttonBounds.removeFromLeft (buttonSpacing);
                    }

                    bounds.removeFromBottom (5);
                }

                messageDescriptionLabel.setBounds (bounds);
            }

            static constexpr int messageTitleHeight = 11;
            static constexpr int buttonHeight = messageHeight / 4;
            static constexpr int buttonSpacing = 5;

            Identifier message;

            Path icon;
            Label messageTitleLabel, messageDescriptionLabel;
            std::vector<std::unique_ptr<TextButton>> buttons;
            ShapeButton dismissButton { {},
                                        findColour (treeIconColourId),
                                        findColour (treeIconColourId).overlaidWith (findColour (defaultHighlightedTextColourId).withAlpha (0.2f)),
                                        findColour (treeIconColourId).overlaidWith (findColour (defaultHighlightedTextColourId).withAlpha (0.4f)) };

            JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MessageComponent)
        };

        //==============================================================================
        void valueTreePropertyChanged   (ValueTree&, const Identifier&) override  { messagesChanged(); }
        void valueTreeChildAdded        (ValueTree&, ValueTree&)        override  { messagesChanged(); }
        void valueTreeChildRemoved      (ValueTree&, ValueTree&, int)   override  { messagesChanged(); }
        void valueTreeChildOrderChanged (ValueTree&, int, int)          override  { messagesChanged(); }
        void valueTreeParentChanged     (ValueTree&)                    override  { messagesChanged(); }
        void valueTreeRedirected        (ValueTree&)                    override  { messagesChanged(); }

        void handleAsyncUpdate() override
        {
            messagesChanged();
        }

        void messagesChanged()
        {
            auto listWasShowing = (getHeight() > 0);

            auto warningsTree = messagesTree.getChildWithName (ProjectMessages::Ids::warning);
            auto notificationsTree = messagesTree.getChildWithName (ProjectMessages::Ids::notification);

            auto removePredicate = [warningsTree, notificationsTree] (std::unique_ptr<MessageComponent>& messageComponent)
            {
                for (int i = 0; i < warningsTree.getNumChildren(); ++i)
                {
                    auto child = warningsTree.getChild (i);

                    if (child.getType() == messageComponent->message
                        && child.getProperty (ProjectMessages::Ids::isVisible))
                    {
                        return false;
                    }
                }

                for (int i = 0; i < notificationsTree.getNumChildren(); ++i)
                {
                    auto child = notificationsTree.getChild (i);

                    if (child.getType() == messageComponent->message
                        && child.getProperty (ProjectMessages::Ids::isVisible))
                    {
                        return false;
                    }
                }

                return true;
            };

            messages.erase (std::remove_if (messages.begin(), messages.end(), removePredicate),
                                            messages.end());

            for (auto* tree : { &warningsTree, &notificationsTree })
            {
                for (int i = 0; i < tree->getNumChildren(); ++i)
                {
                    auto child = tree->getChild (i);

                    if (! child.getProperty (ProjectMessages::Ids::isVisible))
                        continue;

                    const auto messageMatchesType = [&child] (const auto& messageComponent)
                    {
                        return messageComponent->message == child.getType();
                    };

                    if (std::none_of (messages.begin(), messages.end(), messageMatchesType))
                    {
                        messages.push_back (std::make_unique<MessageComponent> (*this,
                                                                                child.getType(),
                                                                                project.getMessageActions (child.getType())));
                        addAndMakeVisible (*messages.back());
                    }
                }
            }

            const auto isNowShowing = (messages.size() > 0);

            owner.updateBounds (isNowShowing != listWasShowing);
            updateSize (owner.getWidth());
        }

        //==============================================================================
        MessagesPopupWindow& owner;
        Project& project;

        ValueTree messagesTree;
        std::vector<std::unique_ptr<MessageComponent>> messages;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MessagesListComponent)
    };

    //==============================================================================
    void componentMovedOrResized (bool, bool) override
    {
        if (isListShowing())
            updateBounds (false);
    }

    using ComponentMovementWatcher::componentMovedOrResized;

    void componentPeerChanged() override
    {
        if (isListShowing())
            updateBounds (false);
    }

    void componentVisibilityChanged() override
    {
        if (isListShowing())
            updateBounds (false);
    }

    using ComponentMovementWatcher::componentVisibilityChanged;

    //==============================================================================
    static constexpr int maxHeight = 500, width = 350, indent = 20;

    Component& targetComponent;
    Component& parentComponent;

    Viewport viewport;
    MessagesListComponent messagesListComponent;

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MessagesPopupWindow)
};

//==============================================================================
class ProjectMessagesComponent final : public Component
{
public:
    ProjectMessagesComponent()
    {
        setFocusContainerType (FocusContainerType::focusContainer);
        setTitle ("Project Messages");

        addAndMakeVisible (warningsComponent);
        addAndMakeVisible (notificationsComponent);

        warningsComponent.addMouseListener (this, true);
        notificationsComponent.addMouseListener (this, true);

        setOpaque (true);
    }

    //==============================================================================
    void resized() override
    {
        auto b = getLocalBounds();

        warningsComponent.setBounds (b.removeFromLeft (b.getWidth() / 2).reduced (5));
        notificationsComponent.setBounds (b.reduced (5));
    }

    void paint (Graphics& g) override
    {
        auto backgroundColour = findColour (backgroundColourId);

        if (isMouseDown || isMouseOver)
            backgroundColour = backgroundColour.overlaidWith (findColour (defaultHighlightColourId)
                                                                 .withAlpha (isMouseDown ? 1.0f : 0.8f));

        g.fillAll (backgroundColour);
    }

    //==============================================================================
    void mouseEnter (const MouseEvent&) override
    {
        isMouseOver = true;
        repaint();
    }

    void mouseExit (const MouseEvent&) override
    {
        isMouseOver = false;
        repaint();
    }

    void mouseDown (const MouseEvent&) override
    {
        isMouseDown = true;
        repaint();
    }

    void mouseUp (const MouseEvent&) override
    {
        isMouseDown = false;
        repaint();

        showOrHideMessagesWindow();
    }

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

    //==============================================================================
    void setProject (Project* newProject)
    {
        if (currentProject != newProject)
        {
            currentProject = newProject;

            if (currentProject != nullptr)
            {
                if (auto* projectWindow = ProjucerApplication::getApp().mainWindowList.getMainWindowForFile (currentProject->getFile()))
                    messagesWindow = std::make_unique<MessagesPopupWindow> (*this, *projectWindow, *currentProject);

                auto projectMessagesTree = currentProject->getProjectMessages();

                warningsComponent.setTree (projectMessagesTree.getChildWithName (ProjectMessages::Ids::warning));
                notificationsComponent.setTree (projectMessagesTree.getChildWithName (ProjectMessages::Ids::notification));
            }
            else
            {
                warningsComponent.setTree ({});
                notificationsComponent.setTree ({});
            }
        }
    }

    void numMessagesChanged()
    {
        const auto total = warningsComponent.getNumMessages()
                           + notificationsComponent.getNumMessages();

        setHelpText (String (total) + (total == 1 ? " message" : " messages"));
    }

    void showOrHideMessagesWindow()
    {
        if (messagesWindow != nullptr)
            showOrHideAllMessages (! messagesWindow->isListShowing());
    }

private:
    //==============================================================================
    struct MessageCountComponent final : public Component,
                                         private ValueTree::Listener
    {
        MessageCountComponent (ProjectMessagesComponent& o, Path pathToUse)
          : owner (o),
            path (pathToUse)
        {
            setInterceptsMouseClicks (false, false);
        }

        void paint (Graphics& g) override
        {
            auto b = getLocalBounds().toFloat();

            g.setColour (findColour ((owner.isMouseDown || owner.isMouseOver) ? defaultHighlightedTextColourId : treeIconColourId));
            g.fillPath (path, path.getTransformToScaleToFit (b.removeFromLeft (b.getWidth() / 2.0f), true));

            b.removeFromLeft (5);
            g.drawFittedText (String (numMessages), b.getSmallestIntegerContainer(), Justification::centredLeft, 1);
        }

        void setTree (ValueTree tree)
        {
            messagesTree = tree;

            if (messagesTree.isValid())
                messagesTree.addListener (this);

            updateNumMessages();
        }

        void updateNumMessages()
        {
            numMessages = messagesTree.getNumChildren();
            owner.numMessagesChanged();
            repaint();
        }

        int getNumMessages() const noexcept  { return numMessages; }

    private:
        void valueTreeChildAdded   (ValueTree&, ValueTree&)        override  { updateNumMessages(); }
        void valueTreeChildRemoved (ValueTree&, ValueTree&, int)   override  { updateNumMessages(); }

        ProjectMessagesComponent& owner;
        ValueTree messagesTree;

        Path path;
        int numMessages = 0;
    };

    void showOrHideAllMessages (bool shouldBeVisible)
    {
        if (currentProject != nullptr)
        {
            auto messagesTree = currentProject->getProjectMessages();

            auto setVisible = [shouldBeVisible] (ValueTree subTree)
            {
                for (int i = 0; i < subTree.getNumChildren(); ++i)
                    subTree.getChild (i).setProperty (ProjectMessages::Ids::isVisible, shouldBeVisible, nullptr);
            };

            setVisible (messagesTree.getChildWithName (ProjectMessages::Ids::warning));
            setVisible (messagesTree.getChildWithName (ProjectMessages::Ids::notification));
        }
    }

    //==============================================================================
    Project* currentProject = nullptr;
    bool isMouseOver = false, isMouseDown = false;

    MessageCountComponent warningsComponent { *this, getIcons().warning },
                          notificationsComponent { *this, getIcons().info };

    std::unique_ptr<MessagesPopupWindow> messagesWindow;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ProjectMessagesComponent)
};