/*
 * This file is part of lanterna (http://code.google.com/p/lanterna/).
 *
 * lanterna is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright (C) 2010-2020 Martin Berglund
 */
package com.googlecode.lanterna.graphics;

import com.googlecode.lanterna.SGR;
import com.googlecode.lanterna.TextColor;

import java.util.Arrays;
import java.util.EnumSet;

This basic implementation of ThemeStyle keeps the styles in its internal state and allows you to mutate them. It can
be used to more easily override an existing theme and make small changes programmatically to it, see Issue409 in the
test section for an example of how to do this.
See Also:
DelegatingThemeDefinition
DelegatingTheme
Theme/**
 * This basic implementation of ThemeStyle keeps the styles in its internal state and allows you to mutate them. It can
 * be used to more easily override an existing theme and make small changes programmatically to it, see Issue409 in the
 * test section for an example of how to do this.
 * @see DelegatingThemeDefinition
 * @see DelegatingTheme
 * @see Theme
 */
public class DefaultMutableThemeStyle implements ThemeStyle {
    private TextColor foreground;
    private TextColor background;
    private EnumSet<SGR> sgrs;

    
Creates a new DefaultMutableThemeStyle based on an existing ThemeStyle. The values of this style that is passed in will be copied into the new object that is created. 
Params:
themeStyleToCopy – ThemeStyle object to copy the style parameters from/**
     * Creates a new {@link DefaultMutableThemeStyle} based on an existing {@link ThemeStyle}. The values of this style
     * that is passed in will be copied into the new object that is created.
     * @param themeStyleToCopy {@link ThemeStyle} object to copy the style parameters from
     */
    public DefaultMutableThemeStyle(ThemeStyle themeStyleToCopy) {
        this(themeStyleToCopy.getForeground(),
                themeStyleToCopy.getBackground(),
                themeStyleToCopy.getSGRs());
    }

    
Creates a new DefaultMutableThemeStyle with a specified style (foreground, background and SGR state) 
Params:
foreground – Foreground color of the text with this style
background – Background color of the text with this style
sgrs – Modifiers to apply to the text with this style/**
     * Creates a new {@link DefaultMutableThemeStyle} with a specified style (foreground, background and SGR state)
     * @param foreground Foreground color of the text with this style
     * @param background Background color of the text with this style
     * @param sgrs Modifiers to apply to the text with this style
     */
    public DefaultMutableThemeStyle(TextColor foreground, TextColor background, SGR... sgrs) {
        this(foreground, background, sgrs.length > 0 ? EnumSet.copyOf(Arrays.asList(sgrs)) : EnumSet.noneOf(SGR.class));
    }

    private DefaultMutableThemeStyle(TextColor foreground, TextColor background, EnumSet<SGR> sgrs) {
        if(foreground == null) {
            throw new IllegalArgumentException("Cannot set SimpleTheme's style foreground to null");
        }
        if(background == null) {
            throw new IllegalArgumentException("Cannot set SimpleTheme's style background to null");
        }
        this.foreground = foreground;
        this.background = background;
        this.sgrs = EnumSet.copyOf(sgrs);
    }

    @Override
    public TextColor getForeground() {
        return foreground;
    }

    @Override
    public TextColor getBackground() {
        return background;
    }

    @Override
    public EnumSet<SGR> getSGRs() {
        return EnumSet.copyOf(sgrs);
    }

    
Modifies the foreground color of this DefaultMutableThemeStyle to the value passed in 
Params:
foreground – New foreground color for this theme style
Returns:
Itself/**
     * Modifies the foreground color of this {@link DefaultMutableThemeStyle} to the value passed in
     * @param foreground New foreground color for this theme style
     * @return Itself
     */
    public DefaultMutableThemeStyle setForeground(TextColor foreground) {
        this.foreground = foreground;
        return this;
    }

    
Modifies the background color of this DefaultMutableThemeStyle to the value passed in 
Params:
background – New background color for this theme style
Returns:
Itself/**
     * Modifies the background color of this {@link DefaultMutableThemeStyle} to the value passed in
     * @param background New background color for this theme style
     * @return Itself
     */
    public DefaultMutableThemeStyle setBackground(TextColor background) {
        this.background = background;
        return this;
    }

    
Modifies the SGR modifiers of this DefaultMutableThemeStyle to the values passed it. 
Params:
sgrs – New SGR modifiers for this theme style, the values in this set will be copied into the internal state
Returns:
Itself/**
     * Modifies the SGR modifiers of this {@link DefaultMutableThemeStyle} to the values passed it.
     * @param sgrs New SGR modifiers for this theme style, the values in this set will be copied into the internal state
     * @return Itself
     */
    public DefaultMutableThemeStyle setSGRs(EnumSet<SGR> sgrs) {
        this.sgrs = EnumSet.copyOf(sgrs);
        return this;
    }
}