package net.minecraft.client.data.models.blockstates;

import com.google.common.collect.ImmutableList;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.world.level.block.state.properties.Property.Value;

@Environment(EnvType.CLIENT)
public final class Selector {
	private static final Selector EMPTY = new Selector(ImmutableList.of());
	private static final Comparator<Value<?>> COMPARE_BY_NAME = Comparator.comparing(value -> value.property().getName());
	private final List<Value<?>> values;

	public Selector extend(Value<?> value) {
		return new Selector(ImmutableList.<Value<?>>builder().addAll(this.values).add(value).build());
	}

	public Selector extend(Selector selector) {
		return new Selector(ImmutableList.<Value<?>>builder().addAll(this.values).addAll(selector.values).build());
	}

	private Selector(List<Value<?>> values) {
		this.values = values;
	}

	public static Selector empty() {
		return EMPTY;
	}

	public static Selector of(Value<?>... values) {
		return new Selector(ImmutableList.copyOf(values));
	}

	public boolean equals(Object object) {
		return this == object || object instanceof Selector && this.values.equals(((Selector)object).values);
	}

	public int hashCode() {
		return this.values.hashCode();
	}

	public String getKey() {
		return (String)this.values.stream().sorted(COMPARE_BY_NAME).map(Value::toString).collect(Collectors.joining(","));
	}

	public String toString() {
		return this.getKey();
	}
}