/*
 * This file is part of Araknemu.
 *
 * Araknemu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Araknemu is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Araknemu.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Copyright (c) 2017-2020 Vincent Quatrevieux
 */

package fr.quatrevieux.araknemu.game.fight.turn.action.util;

import fr.arakne.utils.value.helper.RandomUtil;
import fr.quatrevieux.araknemu.data.constant.Characteristic;
import fr.quatrevieux.araknemu.game.fight.fighter.ActiveFighter;
import org.checkerframework.checker.index.qual.NonNegative;
import org.checkerframework.checker.index.qual.Positive;

/**
 * Base algorithm for compute criticality
 */
public final class BaseCriticalityStrategy implements CriticalityStrategy {
    private final RandomUtil random = new RandomUtil();

    @Override
    public @Positive int hitRate(ActiveFighter fighter, int base) {
        if (base <= 2) {
            return Math.max(base, 1);
        }

        base -= fighter.characteristics().get(Characteristic.CRITICAL_BONUS);

        final int agility = Math.max(fighter.characteristics().get(Characteristic.AGILITY), 0);
        final int rate = Math.min((int) ((base * 2.9901) / Math.log(agility + 12)), base);

        return Math.max(rate, 2);
    }

    @Override
    public boolean hit(ActiveFighter fighter, @NonNegative int baseRate) {
        if (baseRate < 2) { // No criticality
            return false;
        }

        return random.reverseBool(hitRate(fighter, baseRate));
    }

    @Override
    public @Positive int failureRate(ActiveFighter fighter, @Positive int base) {
        return Math.max(base - fighter.characteristics().get(Characteristic.FAIL_MALUS), 2);
    }

    @Override
    public boolean failed(ActiveFighter fighter, @NonNegative int baseRate) {
        return baseRate > 0 && random.reverseBool(failureRate(fighter, baseRate));
    }
}