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

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

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

#include "../jucer_Headers.h"
#include "jucer_Application.h"
#include "jucer_AppearanceSettings.h"
#include "jucer_GlobalPreferences.h"

namespace AppearanceColours
{
    struct ColourInfo
    {
        const char* name;
        int colourID;
        bool mustBeOpaque;
        bool applyToEditorOnly;
    };

    static const ColourInfo colours[] =
    {
        { "Main Window Bkgd",   mainBackgroundColourId, true, false },
        { "Treeview Highlight", TreeView::selectedItemBackgroundColourId, false, false },

        { "Code Background",    CodeEditorComponent::backgroundColourId, true, false },
        { "Line Number Bkgd",   CodeEditorComponent::lineNumberBackgroundId, false, false },
        { "Line Numbers",       CodeEditorComponent::lineNumberTextId, false, false },
        { "Plain Text",         CodeEditorComponent::defaultTextColourId, false, false },
        { "Selected Text Bkgd", CodeEditorComponent::highlightColourId, false, false },
        { "Caret",              CaretComponent::caretColourId, false, true }
    };

    enum
    {
        numColours = sizeof (AppearanceColours::colours) / sizeof (AppearanceColours::colours[0])
    };
}

//==============================================================================
AppearanceSettings::AppearanceSettings (bool updateAppWhenChanged)
    : settings ("COLOUR_SCHEME")
{
    if (! ProjucerApplication::getApp().isRunningCommandLine)
    {
        ProjucerLookAndFeel lf;

        for (int i = 0; i < AppearanceColours::numColours; ++i)
            getColourValue (AppearanceColours::colours[i].name) = lf.findColour (AppearanceColours::colours[i].colourID).toString();

        CodeDocument doc;
        CPlusPlusCodeTokeniser tokeniser;
        CodeEditorComponent editor (doc, &tokeniser);

        const CodeEditorComponent::ColourScheme cs (editor.getColourScheme());

        for (int i = cs.types.size(); --i >= 0;)
        {
            CodeEditorComponent::ColourScheme::TokenType& t = cs.types.getReference(i);
            getColourValue (t.name) = t.colour.toString();
        }

        getCodeFontValue() = getDefaultCodeFont().toString();

        if (updateAppWhenChanged)
            settings.addListener (this);
    }
}

File AppearanceSettings::getSchemesFolder()
{
    File f (getGlobalProperties().getFile().getSiblingFile ("Schemes"));
    f.createDirectory();
    return f;
}

void AppearanceSettings::writeDefaultSchemeFile (const String& xmlString, const String& name)
{
    const File file (getSchemesFolder().getChildFile (name).withFileExtension (getSchemeFileSuffix()));

    AppearanceSettings settings (false);

    ScopedPointer<XmlElement> xml (XmlDocument::parse (xmlString));
    if (xml != nullptr)
        settings.readFromXML (*xml);

    settings.writeToFile (file);
}

void AppearanceSettings::refreshPresetSchemeList()
{
    writeDefaultSchemeFile (BinaryData::colourscheme_dark_xml,  "Default (Dark)");
    writeDefaultSchemeFile (BinaryData::colourscheme_light_xml, "Default (Light)");

    Array<File> newSchemes;
    getSchemesFolder().findChildFiles (newSchemes, File::findFiles, false, String ("*") + getSchemeFileSuffix());

    if (newSchemes != presetSchemeFiles)
    {
        presetSchemeFiles.swapWith (newSchemes);
        ProjucerApplication::getCommandManager().commandStatusChanged();
    }
}

StringArray AppearanceSettings::getPresetSchemes()
{
    StringArray s;
    for (int i = 0; i < presetSchemeFiles.size(); ++i)
        s.add (presetSchemeFiles.getReference(i).getFileNameWithoutExtension());

    return s;
}

void AppearanceSettings::selectPresetScheme (int index)
{
    readFromFile (presetSchemeFiles [index]);
}

bool AppearanceSettings::readFromXML (const XmlElement& xml)
{
    if (xml.hasTagName (settings.getType().toString()))
    {
        const ValueTree newSettings (ValueTree::fromXml (xml));

        // we'll manually copy across the new properties to the existing tree so that
        // any open editors will be kept up to date..
        settings.copyPropertiesFrom (newSettings, nullptr);

        for (int i = settings.getNumChildren(); --i >= 0;)
        {
            ValueTree c (settings.getChild (i));

            const ValueTree newValue (newSettings.getChildWithProperty (Ids::name, c.getProperty (Ids::name)));

            if (newValue.isValid())
                c.copyPropertiesFrom (newValue, nullptr);
        }

        return true;
    }

    return false;
}

bool AppearanceSettings::readFromFile (const File& file)
{
    const ScopedPointer<XmlElement> xml (XmlDocument::parse (file));
    return xml != nullptr && readFromXML (*xml);
}

bool AppearanceSettings::writeToFile (const File& file) const
{
    const ScopedPointer<XmlElement> xml (settings.createXml());
    return xml != nullptr && xml->writeToFile (file, String());
}

Font AppearanceSettings::getDefaultCodeFont()
{
    return Font (Font::getDefaultMonospacedFontName(), Font::getDefaultStyle(), 13.0f);
}

StringArray AppearanceSettings::getColourNames() const
{
    StringArray s;

    for (int i = 0; i < settings.getNumChildren(); ++i)
    {
        const ValueTree c (settings.getChild(i));

        if (c.hasType ("COLOUR"))
            s.add (c [Ids::name]);
    }

    return s;
}

void AppearanceSettings::updateColourScheme()
{
    applyToLookAndFeel (LookAndFeel::getDefaultLookAndFeel());
    ProjucerApplication::getApp().mainWindowList.sendLookAndFeelChange();
}

void AppearanceSettings::applyToLookAndFeel (LookAndFeel& lf) const
{
    for (int i = 0; i < AppearanceColours::numColours; ++i)
    {
        Colour col;
        if (getColour (AppearanceColours::colours[i].name, col))
        {
            if (AppearanceColours::colours[i].mustBeOpaque)
                col = Colours::white.overlaidWith (col);

            if (! AppearanceColours::colours[i].applyToEditorOnly)
                lf.setColour (AppearanceColours::colours[i].colourID, col);
        }
    }

    lf.setColour (ScrollBar::thumbColourId, lf.findColour (mainBackgroundColourId).contrasting().withAlpha (0.13f));
}

void AppearanceSettings::applyToCodeEditor (CodeEditorComponent& editor) const
{
    CodeEditorComponent::ColourScheme cs (editor.getColourScheme());

    for (int i = cs.types.size(); --i >= 0;)
    {
        CodeEditorComponent::ColourScheme::TokenType& t = cs.types.getReference(i);
        getColour (t.name, t.colour);
    }

    editor.setColourScheme (cs);
    editor.setFont (getCodeFont());

    for (int i = 0; i < AppearanceColours::numColours; ++i)
    {
        if (AppearanceColours::colours[i].applyToEditorOnly)
        {
            Colour col;
            if (getColour (AppearanceColours::colours[i].name, col))
                editor.setColour (AppearanceColours::colours[i].colourID, col);
        }
    }

    editor.setColour (ScrollBar::thumbColourId, editor.findColour (CodeEditorComponent::backgroundColourId)
                                                      .contrasting()
                                                      .withAlpha (0.13f));
}

Font AppearanceSettings::getCodeFont() const
{
    const String fontString (settings [Ids::font].toString());

    if (fontString.isEmpty())
        return getDefaultCodeFont();

    return Font::fromString (fontString);
}

Value AppearanceSettings::getCodeFontValue()
{
    return settings.getPropertyAsValue (Ids::font, nullptr);
}

Value AppearanceSettings::getColourValue (const String& colourName)
{
    ValueTree c (settings.getChildWithProperty (Ids::name, colourName));

    if (! c.isValid())
    {
        c = ValueTree ("COLOUR");
        c.setProperty (Ids::name, colourName, nullptr);
        settings.addChild (c, -1, nullptr);
    }

    return c.getPropertyAsValue (Ids::colour, nullptr);
}

bool AppearanceSettings::getColour (const String& name, Colour& result) const
{
    const ValueTree colour (settings.getChildWithProperty (Ids::name, name));

    if (colour.isValid())
    {
        result = Colour::fromString (colour [Ids::colour].toString());
        return true;
    }

    return false;
}
