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TSL2 Framework to provide and use a structure of elements referenced by unique names - to declare a kit of logic in a json/yaml/xml text file
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/*
 * File: $HeadURL$
 * Id  : $Id$
 * 
 * created by: Tom
 * created on: 31.03.2017
 * 
 * Copyright: (c) Thomas Schneider 2017, all rights reserved
 */
package de.tsl2.nano.modelkit.impl;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Objects;

import com.fasterxml.jackson.annotation.JsonIgnore;

import de.tsl2.nano.modelkit.Identified;
import de.tsl2.nano.modelkit.Selectable;
import de.tsl2.nano.modelkit.TriFunction;
import lombok.Getter;
import lombok.Setter;

/**
 * a comparator to be identified through its owning configuration. checks, if available for the current constalation and has a
 * comparator chain on equality of compared objects.
 */
public class Comp extends AIdentified implements Comparator, Selectable> {
    static {
        ModelKitLoader.registereElement(Comp.class);
    }

    @JsonIgnore
    TriFunction comparator;
    @Getter @Setter
    private List onEqualsThen;
    @Getter @Setter
    private String selectorFact;

	Comp() {
    	}

    public Comp(String name, String selectorFact, TriFunction comparator,
        String... onEqualsThen) {
        super(name);
        this.selectorFact = selectorFact;
        this.comparator = comparator;
        this.onEqualsThen = Arrays.asList(onEqualsThen);
    }

    @Override
    public void validate() {
        Objects.requireNonNull(comparator,
                () -> config.name + ": main comparator is null (not registered?): " + toString());
        checkExistence(selectorFact, Fact.class);
        checkExistence(Comp.class, onEqualsThen);
    }

    @Override
    public void tagNames(String parent) {
        super.tagNames(parent);
        selectorFact = tag(parent, selectorFact);
        tag(parent, onEqualsThen);
    }
    @Override
    public boolean canSelect(List current) {
        if (selectorFact == null) {
            return true;
        }
        return canSelect(selectorFact, current.get(0)) || canSelect(selectorFact, current.get(1));
    }

    @Override
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public int compare(T o1, T o2) {
        visited();
        int c = comparator.apply(config, o1, o2);
        if (c == 0) {
            List comparators = get(Comp.class);
            for (String nextComparatorName : onEqualsThen) {
                Comp comp = Identified.get(comparators, nextComparatorName);
                if (comp.canSelect(Arrays.asList(o1, o2))) {
                    c = comp.compare(o1, o2);
                    if (c != 0) {
                        break;
                    }
                }
            }
        }
        return c;
    }

    /**
     * convenience for three way comparators inside lambda function. if resultToNegative (=-1) and resultToPositive (=1) both
     * false, returns 0
     */
    public static int threeWayResult(boolean resultToNegative, boolean resultToPositive) {
        return threeWay(resultToNegative, -1, resultToPositive, 1, 0);
    }

    public static int threeWay(boolean first, int firstResult, boolean second, int secondResult, int thirdResult) {
        if (first) {
            return firstResult;
        } else if (second) {
            return secondResult;
        } else {
            return thirdResult;
        }
    }

    @Override
    public String toString() {
        return super.toString() + " [" + selectorFact + " -> onequal:chain: " + onEqualsThen + "]";
    }

    public Object describe(String prefix) {
        StringBuilder b = new StringBuilder(prefix + toString() + "\n");
        onEqualsThen.forEach(c -> b.append(get(c, Comp.class).describe(prefix + "\t")));
        return b.toString();
    }
}