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

   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.

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

#pragma once

#include "../../Utility/UI/PropertyComponents/jucer_ColourPropertyComponent.h"

//==============================================================================
class EditorColourSchemeWindowComponent    : public Component
{
public:
    EditorColourSchemeWindowComponent()
    {
        if (getAppSettings().monospacedFontNames.size() == 0)
            changeContent (new AppearanceEditor::FontScanPanel());
        else
            changeContent (new AppearanceEditor::EditorPanel());
    }

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

    void resized() override
    {
       content->setBounds (getLocalBounds());
    }

    void changeContent (Component* newContent)
    {
        content.reset (newContent);
        addAndMakeVisible (newContent);
        content->setBounds (getLocalBounds().reduced (10));
    }

private:
    std::unique_ptr<Component> content;

    //==============================================================================
    struct AppearanceEditor
    {
        struct FontScanPanel   : public Component,
                                 private Timer
        {
            FontScanPanel()
            {
                fontsToScan = Font::findAllTypefaceNames();
                startTimer (1);
            }

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

                g.setFont (14.0f);
                g.setColour (findColour (defaultTextColourId));
                g.drawFittedText ("Scanning for fonts..", getLocalBounds(), Justification::centred, 2);

                const auto size = 30;
                getLookAndFeel().drawSpinningWaitAnimation (g, Colours::white, (getWidth() - size) / 2, getHeight() / 2 - 50, size, size);
            }

            void timerCallback() override
            {
                repaint();

                if (fontsToScan.size() == 0)
                {
                    getAppSettings().monospacedFontNames = fontsFound;

                    if (auto* owner = findParentComponentOfClass<EditorColourSchemeWindowComponent>())
                        owner->changeContent (new EditorPanel());
                }
                else
                {
                    if (isMonospacedTypeface (fontsToScan[0]))
                        fontsFound.add (fontsToScan[0]);

                    fontsToScan.remove (0);
                }
            }

            // A rather hacky trick to select only the fixed-pitch fonts..
            // This is unfortunately a bit slow, but will work on all platforms.
            static bool isMonospacedTypeface (const String& name)
            {
                const Font font (name, 20.0f, Font::plain);

                const auto width = font.getStringWidth ("....");

                return width == font.getStringWidth ("WWWW")
                    && width == font.getStringWidth ("0000")
                    && width == font.getStringWidth ("1111")
                    && width == font.getStringWidth ("iiii");
            }

            StringArray fontsToScan, fontsFound;
        };

        //==============================================================================
        struct EditorPanel  : public Component
        {
            EditorPanel()
                : loadButton ("Load Scheme..."),
                  saveButton ("Save Scheme...")
            {
                rebuildProperties();
                addAndMakeVisible (panel);

                addAndMakeVisible (loadButton);
                addAndMakeVisible (saveButton);

                loadButton.onClick = [this] { loadScheme(); };
                saveButton.onClick = [this] { saveScheme (false); };

                lookAndFeelChanged();

                saveSchemeState();
            }

            ~EditorPanel() override
            {
                if (hasSchemeBeenModifiedSinceSave())
                    saveScheme (true);
            }

            void rebuildProperties()
            {
                auto& scheme = getAppSettings().appearance;

                Array<PropertyComponent*> props;
                auto fontValue = scheme.getCodeFontValue();
                props.add (FontNameValueSource::createProperty ("Code Editor Font", fontValue));
                props.add (FontSizeValueSource::createProperty ("Font Size", fontValue));

                const auto colourNames = scheme.getColourNames();

                for (int i = 0; i < colourNames.size(); ++i)
                    props.add (new ColourPropertyComponent (nullptr, colourNames[i],
                                                            scheme.getColourValue (colourNames[i]),
                                                            Colours::white, false));

                panel.clear();
                panel.addProperties (props);
            }

            void resized() override
            {
                auto r = getLocalBounds();
                panel.setBounds (r.removeFromTop (getHeight() - 28).reduced (10, 2));
                loadButton.setBounds (r.removeFromLeft (getWidth() / 2).reduced (10, 1));
                saveButton.setBounds (r.reduced (10, 1));
            }

        private:
            PropertyPanel panel;
            TextButton loadButton, saveButton;

            Font codeFont;
            Array<var> colourValues;

            void saveScheme (bool isExit)
            {
                FileChooser fc ("Select a file in which to save this colour-scheme...",
                                getAppSettings().appearance.getSchemesFolder()
                                .getNonexistentChildFile ("Scheme", AppearanceSettings::getSchemeFileSuffix()),
                                AppearanceSettings::getSchemeFileWildCard());

                if (fc.browseForFileToSave (true))
                {
                    File file (fc.getResult().withFileExtension (AppearanceSettings::getSchemeFileSuffix()));
                    getAppSettings().appearance.writeToFile (file);
                    getAppSettings().appearance.refreshPresetSchemeList();

                    saveSchemeState();
                    ProjucerApplication::getApp().selectEditorColourSchemeWithName (file.getFileNameWithoutExtension());
                }
                else if (isExit)
                {
                    restorePreviousScheme();
                }
            }

            void loadScheme()
            {
                FileChooser fc ("Please select a colour-scheme file to load...",
                                getAppSettings().appearance.getSchemesFolder(),
                                AppearanceSettings::getSchemeFileWildCard());

                if (fc.browseForFileToOpen())
                {
                    if (getAppSettings().appearance.readFromFile (fc.getResult()))
                    {
                        rebuildProperties();
                        saveSchemeState();
                    }
                }
            }

            void lookAndFeelChanged() override
            {
                loadButton.setColour (TextButton::buttonColourId,
                                      findColour (secondaryButtonBackgroundColourId));
            }

            void saveSchemeState()
            {
                auto& appearance = getAppSettings().appearance;
                const auto colourNames = appearance.getColourNames();

                codeFont = appearance.getCodeFont();

                colourValues.clear();
                for (int i = 0; i < colourNames.size(); ++i)
                    colourValues.add (appearance.getColourValue (colourNames[i]).getValue());
            }

            bool hasSchemeBeenModifiedSinceSave()
            {
                auto& appearance = getAppSettings().appearance;
                const auto colourNames = appearance.getColourNames();

                if (codeFont != appearance.getCodeFont())
                    return true;

                for (int i = 0; i < colourNames.size(); ++i)
                    if (colourValues[i] != appearance.getColourValue (colourNames[i]).getValue())
                        return true;

                return false;
            }

            void restorePreviousScheme()
            {
                auto& appearance = getAppSettings().appearance;
                const auto colourNames = appearance.getColourNames();

                appearance.getCodeFontValue().setValue (codeFont.toString());

                for (int i = 0; i < colourNames.size(); ++i)
                    appearance.getColourValue (colourNames[i]).setValue (colourValues[i]);
            }


            JUCE_DECLARE_NON_COPYABLE (EditorPanel)
        };

        //==============================================================================
        struct FontNameValueSource   : public ValueSourceFilter
        {
            FontNameValueSource (const Value& source)  : ValueSourceFilter (source) {}

            var getValue() const override
            {
                return Font::fromString (sourceValue.toString()).getTypefaceName();
            }

            void setValue (const var& newValue) override
            {
                auto font = Font::fromString (sourceValue.toString());
                font.setTypefaceName (newValue.toString().isEmpty() ? Font::getDefaultMonospacedFontName()
                                      : newValue.toString());
                sourceValue = font.toString();
            }

            static ChoicePropertyComponent* createProperty (const String& title, const Value& value)
            {
                auto fontNames = getAppSettings().monospacedFontNames;

                Array<var> values;
                values.add (Font::getDefaultMonospacedFontName());
                values.add (var());

                for (int i = 0; i < fontNames.size(); ++i)
                    values.add (fontNames[i]);

                StringArray names;
                names.add ("<Default Monospaced>");
                names.add (String());
                names.addArray (getAppSettings().monospacedFontNames);

                return new ChoicePropertyComponent (Value (new FontNameValueSource (value)),
                                                    title, names, values);
            }
        };

        //==============================================================================
        struct FontSizeValueSource   : public ValueSourceFilter
        {
            FontSizeValueSource (const Value& source)  : ValueSourceFilter (source) {}

            var getValue() const override
            {
                return Font::fromString (sourceValue.toString()).getHeight();
            }

            void setValue (const var& newValue) override
            {
                sourceValue = Font::fromString (sourceValue.toString()).withHeight (newValue).toString();
            }

            static PropertyComponent* createProperty (const String& title, const Value& value)
            {
                return new SliderPropertyComponent (Value (new FontSizeValueSource (value)),
                                                    title, 5.0, 40.0, 0.1, 0.5);
            }
        };
    };

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (EditorColourSchemeWindowComponent)
};