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package com.github.sheigutn.pushbullet.util;

import java.util.List;
import java.util.Optional;
import java.util.function.Function;

public class FunctionUtil {

    /**
     * Returns an object of a list where at least one result of the functions matches with the value

     * The U param of the functions is given by another function

     * Yeah, I know, it's complicated
     * @param objects        The object list
     * @param mapperFunction The function
     * @param value          The value to match
     * @param functions      The functions array
     * @param             The object type
     * @param             The mapping type
     * @param             The result type of the array's functions
     * @return An object of the list or null
     */
    @SafeVarargs
    public static  T getFirstWithFunctionWithCondition(List objects, Function mapperFunction, V value, Function... functions) {
        Optional first = objects.stream()
                .filter(object -> {
                    U methodVal = mapperFunction.apply(object);
                    boolean has = false;
                    for (Function function : functions) {
                        has = has || value.equals(function.apply(methodVal));
                    }
                    return has;
                }).findFirst();
        return first.isPresent() ? first.get() : null;
    }

    /**
     * Returns an object of a list where at least one result of the functions matches with the value

     * @param objects   The object list
     * @param value     The value to match
     * @param functions The functions array
     * @param        The object type
     * @param        The result type of the array's functions
     * @return An object of the list or null
     */
    @SafeVarargs
    public static  T getFirstWithCondition(List objects, U value, Function... functions) {
        Optional first = objects.stream()
                .filter(object -> {
                    boolean has = false;
                    for (Function function : functions) {
                        has = has || value.equals(function.apply(object));
                    }
                    return has;
                }).findFirst();
        return first.isPresent() ? first.get() : null;
    }
}