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/*
 * Copyright (C) 2022 Parisi Alessandro - [email protected]
 * This file is part of MaterialFX (https://github.com/palexdev/MaterialFX)
 *
 * MaterialFX 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.
 *
 * MaterialFX 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 MaterialFX. If not, see .
 */

package io.github.palexdev.mfxeffects.utils;

import javafx.css.CssMetaData;
import javafx.css.Styleable;
import javafx.geometry.Insets;
import javafx.scene.layout.*;
import javafx.scene.paint.Paint;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class StyleUtils {

    private StyleUtils() {
    }

    /**
     * Changes the background color of a {@code Region} to the desired one.
     *
     * @param region The region to change the background color to
     * @param fill   The desired color
     */
    public static void updateBackground(Region region, Paint fill) {
        final Background background = region.getBackground();
        if (background == null || background.getFills().isEmpty()) {
            return;
        }

        final List fills = new ArrayList<>();
        for (BackgroundFill bf : background.getFills()) {
            fills.add(new BackgroundFill(fill, bf.getRadii(), bf.getInsets()));
        }

        region.setBackground(new Background(fills.toArray(BackgroundFill[]::new)));
    }

    /**
     * Changes the background color of a {@code Region} to the desired one and lets specify the background insets.
     *
     * @param region           The region to change the background color to
     * @param fill             The desired color
     * @param backgroundInsets The background insets to use
     */
    public static void updateBackground(Region region, Paint fill, Insets backgroundInsets) {
        final Background background = region.getBackground();
        if (background == null || background.getFills().isEmpty()) {
            return;
        }

        final List fills = new ArrayList<>();
        for (BackgroundFill bf : background.getFills()) {
            fills.add(new BackgroundFill(fill, bf.getRadii(), backgroundInsets));
        }

        region.setBackground(new Background(fills.toArray(BackgroundFill[]::new)));
    }

    public static void updateBackground(Region region, Paint fill, CornerRadii cornerRadii, Insets backgroundInsets) {
        final Background background = region.getBackground();
        if (background == null || background.getFills().isEmpty()) {
            return;
        }

        final List fills = new ArrayList<>();
        for (BackgroundFill bf : background.getFills()) {
            fills.add(new BackgroundFill(fill, cornerRadii, backgroundInsets));
        }

        region.setBackground(new Background(fills.toArray(BackgroundFill[]::new)));
    }

    /**
     * Sets the background of the given region to the given color.
     */
    public static void setBackground(Region region, Paint fill) {
        setBackground(region, fill, CornerRadii.EMPTY, Insets.EMPTY);
    }

    /**
     * Sets the background of the given region to the given color, with the given radius.
     */
    public static void setBackground(Region region, Paint fill, CornerRadii radius) {
        setBackground(region, fill, radius, Insets.EMPTY);
    }

    /**
     * Sets the background of the given region to the given color, with the given radius and insets.
     */
    public static void setBackground(Region region, Paint fill, CornerRadii radius, Insets insets) {
        region.setBackground(new Background(new BackgroundFill(fill, radius, insets)));
    }

    /**
     * Tries to parse the given Region's corner radius.
     * 
     * To be more precise it tries to parse both the background and the
     * border radius. The background radius is prioritized over the border one
     * but in case the background is null or empty then the border one is used.
     * 
     * In case of both null or empty returns {@link  CornerRadii#EMPTY}.
     */
    public static CornerRadii parseCornerRadius(Region region) {
        CornerRadii backRadius = CornerRadii.EMPTY;
        CornerRadii bordRadius = CornerRadii.EMPTY;

        Background background = region.getBackground();
        if (background != null && !background.isEmpty()) {
            backRadius = background.getFills().get(0).getRadii();
        }

        Border border = region.getBorder();
        if (border != null && !border.isEmpty()) {
            bordRadius = border.getStrokes().get(0).getRadii();
        }

        return !backRadius.equals(CornerRadii.EMPTY) ? backRadius : bordRadius;
    }

    @SafeVarargs
    public static List> cssMetaDataList(List> styleable, CssMetaData... cssMetaData) {
        CssMetaDataList styleableMetaData = new CssMetaDataList(styleable);
        styleableMetaData.addAll(cssMetaData);
        return styleableMetaData.toUnmodifiable();
    }

    public static class CssMetaDataList extends ArrayList> {
        public CssMetaDataList() {
        }

        public CssMetaDataList(Collection> c) {
            super(c);
        }

        @SafeVarargs
        public final boolean addAll(CssMetaData... cssMetaData) {
            return Collections.addAll(this, cssMetaData);
        }

        public List> toUnmodifiable() {
            return Collections.unmodifiableList(this);
        }
    }
}