package de.intevation.flys.client.shared.model;

import java.io.Serializable;

import java.util.List;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ThemeList implements Serializable {

    public List<Theme> themes;


    public ThemeList() {
    }


    public ThemeList(List<Theme> themes) {
        this.themes = themes;
    }


    public List<Theme> getThemes() {
        return themes;
    }


    public int getThemeCount() {
        return themes.size();
    }


    /**
     * Returns a theme at a specific position. <b>NOTE: Themes start at position
     * 1. So, take care in loops, that might start at index 0!</b>
     *
     * @param pos The position of the desired theme.
     *
     * @return a theme.
     */
    public Theme getThemeAt(int pos) {
        for (Theme theme: themes) {
            if (theme.getPosition() == pos) {
                return theme;
            }
        }

        return null;
    }


    public void removeTheme(Theme theme) {
        if (theme != null) {
            themes.remove(theme);
        }
    }


    public void addTheme(Theme theme) {
        if (theme != null) {
            themes.add(theme);
        }
    }


    /**
     * Modifies the order of themes in this list and the position of the
     * <i>theme</i> itself.
     *
     * @param theme The theme which position has to be modified.
     * @param newPos The new position.
     */
    public void setThemePosition(Theme theme, int newPos) {
        int count  = getThemeCount();
        int oldPos = theme.getPosition();

        if (newPos == oldPos || newPos > count || newPos < 1) {
            return;
        }

        boolean moveUp = newPos < oldPos;

        for (Theme aTheme: themes) {
            int tmpPos = aTheme.getPosition();

            if (theme.equals(aTheme)) {
                theme.setPosition(newPos);
            }
            else if (tmpPos >= newPos && tmpPos < oldPos && moveUp) {
                aTheme.setPosition(tmpPos+1);
            }
            else if (tmpPos <= newPos && tmpPos > oldPos && !moveUp) {
                aTheme.setPosition(tmpPos-1);
            }
        }
    }
}
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