package mindustry.world;

import arc.util.*;
import arc.util.io.*;
import mindustry.annotations.Annotations.*;
import mindustry.gen.*;
import mindustry.type.*;

import static mindustry.Vars.*;

public class ItemBuffer{
    private long[] buffer;
    private int index;

    public ItemBuffer(int capacity){
        this.buffer = new long[capacity];
    }

    public boolean accepts(){
        return index < buffer.length;
    }

    public void accept(Item item, short data){
        //if(!accepts()) return;
        buffer[index++] = TimeItem.get(data, item.id, Time.time);
    }

    public void accept(Item item){
        accept(item, (short)-1);
    }

    public Item poll(float speed){
        if(index > 0){
            long l = buffer[0];
            float time = TimeItem.time(l);

            if(Time.time >= time + speed || Time.time < time){
                return content.item(TimeItem.item(l));
            }
        }
        return null;
    }

    public void remove(){
        System.arraycopy(buffer, 1, buffer, 0, index - 1);
        index--;
    }

    public void write(Writes write){
        write.b((byte)index);
        write.b((byte)buffer.length);
        for(long l : buffer){
            write.l(l);
        }
    }

    public void read(Reads read){
        index = read.b();
        byte length = read.b();
        for(int i = 0; i < length; i++){
            long l = read.l();
            if(i < buffer.length){
                buffer[i] = l;
            }
        }
        index = Math.min(index, length - 1);
    }

    @Struct
    class TimeItemStruct{
        short data;
        short item;
        float time;
    }
}