package kr.entree.lionbossraid.config.option;

import kr.entree.lionbossraid.config.option.config.ConfigProperty;
import org.bukkit.configuration.ConfigurationSection;

import java.util.Collection;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.stream.Collector;
import java.util.stream.Collectors;

/**
 * Created by JunHyung Lim on 2019-12-06
 */
public class Mapper<T, R> implements Property<R> {
    private final Property<T> property;
    private final Function<T, R> mapper;
    private final Consumer<R> setter;

    private Mapper(Property<T> property, Function<T, R> mapper, Consumer<R> setter) {
        this.property = property;
        this.mapper = mapper;
        this.setter = setter;
    }

    public static <T, R> Mapper<T, R> of(Property<T> property, Function<T, R> mapper, Consumer<R> setter) {
        return new Mapper<>(property, mapper, setter);
    }

    public static <T, R extends T> Mapper<T, R> of(Property<T> property, Function<T, R> mapper) {
        return of(property, mapper, property::set);
    }

    public static <T extends Number> Mapper<Number, T> configNumberOf(ConfigurationSection section, String key, Function<Number, T> mapper) {
        return of(ConfigProperty.ofNumber(section, key), mapper);
    }

    public static <T, R extends T> Mapper<Collection<T>, ? extends Collection<R>> collectOf(Property<Collection<T>> property, Function<T, R> mapper, Collector<R, Object, ? extends Collection<R>> collector) {
        return of(property, ts -> ts.stream().map(mapper).collect(collector), rs -> property.set((Collection<T>) rs));
    }

    public static <T, R extends T> Mapper<Collection<T>, List<R>> listOf(Property<Collection<T>> property, Function<T, R> mapper) {
        return Mapper.collectOf(property, mapper, Collectors.toList());
    }

    @Override
    public R get() {
        return mapper.apply(property.get());
    }

    @Override
    public void set(R value) {
        setter.accept(value);
    }
}