/**
 *  the Real-Time Clock mod adds the system time to the Minecraft HUD.
 *  Copyright (C) 2015  Xilef11
 *  Licensed under the GNU General Public License version 3
 *
 *  File created by Xilef11 on 2015-04-19
 */
package xilef11.mc.realtimeclock.client.gui;

import java.util.Calendar;
import java.util.Locale;
import java.util.TimeZone;

import net.minecraft.client.Minecraft;

import org.lwjgl.opengl.GL11;

import xilef11.mc.realtimeclock.handler.ConfigurationHandler;
import xilef11.mc.realtimeclock.utilities.RenderingPosHelper;

/**
 * @author Xilef11
 *
 */
public class Clock {
    private static boolean enabled=true;

    public static void toggleEnabled(){enabled=!enabled;}

    public static boolean isEnabled(){return enabled;}

    /** Do we want to show the clock
     * @return true to show the clock
     */
    public static boolean doesRender(Minecraft mc) {
        //when to render
        //render only if currently playing
        if (mc.theWorld ==null ) return false;
        //if(ConfigurationHandler.showPause && mc.currentScreen instanceof net.minecraft.client.gui.GuiIngameMenu)return true;
        if(!enabled)return false;
        return true;
    }
    //debugging
    //private static int numTicks=0;
    /**Draw the Time
     *
     */
    public static void draw(Minecraft mc) {
        //get the correct position and scale
        int xPos=RenderingPosHelper.getXPosByScreenSize(mc, ConfigurationHandler.clockPosX);
        int yPos=RenderingPosHelper.getYPosByScreenSize(mc, ConfigurationHandler.clockPosY);
        float scale=ConfigurationHandler.clockScale/100;
        //draw the time
        GL11.glPushMatrix();
        GL11.glScalef(scale, scale, 1);
        mc.fontRenderer.drawString(getTimeString(mc), Math.round(xPos/scale), Math.round(yPos/scale), ConfigurationHandler.color,drawShadow(mc));
        GL11.glPopMatrix();
    }
    /** returns a String with the current time according to config options
     * @Param mc the instance of Minecraft, required to get the localization
     * @return the current time as a String
     */
    private static String getTimeString(Minecraft mc){
        // get the time
        Calendar time = Calendar.getInstance(TimeZone.getDefault(), Locale.forLanguageTag(mc.gameSettings.language));
        //get the hour depending on the time format to use
        int hour;
        if(ConfigurationHandler.use24hours){
            hour=time.get(time.HOUR_OF_DAY);
        }else{
            hour=time.get(time.HOUR);
        }
        int minute = time.get(time.MINUTE);
        //make sure the minutes have 2 digits
        String minuteS= minute<10? "0"+minute : String.valueOf(minute);
        return hour+" : "+minuteS;
    }
    /** should the string shadow be rendered? depends on the config and current GUI
     *
     * @param mc
     * @return
     */
    private static boolean drawShadow(Minecraft mc){
        //don't draw the shadow if the config says we shouldn't
        if(!ConfigurationHandler.drawShadow) return false;
        //don't draw the shadow in menus to avoid bugs (i.e achievements gui...)
        if(mc.currentScreen != null) return false;
        return true;
    }
}