/*
 * 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) 2017-2019 Vincent Quatrevieux
 */

package fr.quatrevieux.araknemu.game.spell.boost;

import fr.quatrevieux.araknemu.game.spell.Spell;
import fr.quatrevieux.araknemu.game.spell.boost.spell.BoostedSpell;

import java.util.Collection;
import java.util.Collections;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * Simple implementation of spell boosts
 */
public final class SimpleSpellsBoosts implements SpellsBoosts {
    private final Map<Integer, Map<Modifier, Integer>> spellsModifiers = new HashMap<>();

    @Override
    public int boost(int spellId, Modifier modifier, int value) {
        final Map<Modifier, Integer> modifiers = spellsModifiers.get(spellId);

        if (modifiers == null || !modifiers.containsKey(modifier)) {
            return set(spellId, modifier, value);
        }

        final int newValue = modifiers.get(modifier) + value;

        if (newValue == 0) {
            modifiers.remove(modifier);
        } else {
            modifiers.put(modifier, newValue);
        }

        return newValue;
    }

    @Override
    public int set(int spellId, Modifier modifier, int value) {
        spellsModifiers
            .computeIfAbsent(spellId, sid -> new EnumMap<>(Modifier.class))
            .put(modifier, value)
        ;

        return value;
    }

    @Override
    public void unset(int spellId, Modifier modifier) {
        final Map<Modifier, Integer> modifiers = spellsModifiers.get(spellId);

        if (modifiers == null) {
            return;
        }

        modifiers.remove(modifier);
    }

    @Override
    public SpellModifiers modifiers(int spellId) {
        return new MapSpellModifiers(
            spellId,
            spellsModifiers.getOrDefault(spellId, Collections.emptyMap())
        );
    }

    @Override
    public Spell get(Spell spell) {
        final Map<Modifier, Integer> modifiers = spellsModifiers.get(spell.id());

        if (modifiers == null || modifiers.isEmpty()) {
            return spell;
        }

        return new BoostedSpell(spell, new MapSpellModifiers(spell.id(), modifiers));
    }

    @Override
    public Collection<SpellModifiers> all() {
        return spellsModifiers.entrySet()
            .stream()
            .map(entry -> new MapSpellModifiers(entry.getKey(), entry.getValue()))
            .collect(Collectors.toList())
        ;
    }
}