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/*
 * Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.dv8tion.jda.internal.utils.cache;

import net.dv8tion.jda.api.entities.ISnowflake;
import net.dv8tion.jda.api.entities.Member;
import net.dv8tion.jda.api.entities.Role;
import net.dv8tion.jda.api.utils.ClosableIterator;
import net.dv8tion.jda.api.utils.cache.CacheView;
import net.dv8tion.jda.api.utils.cache.MemberCacheView;
import net.dv8tion.jda.api.utils.cache.SnowflakeCacheView;
import net.dv8tion.jda.api.utils.cache.UnifiedMemberCacheView;
import net.dv8tion.jda.internal.utils.ChainedClosableIterator;
import net.dv8tion.jda.internal.utils.Helpers;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.*;
import java.util.function.Consumer;
import java.util.function.Supplier;
import java.util.stream.Stream;

public class UnifiedCacheViewImpl> implements CacheView
{
    protected final Supplier> generator;

    public UnifiedCacheViewImpl(Supplier> generator)
    {
        this.generator = generator;
    }

    @Override
    public long size()
    {
        return distinctStream().mapToLong(CacheView::size).sum();
    }

    @Override
    public boolean isEmpty()
    {
        return distinctStream().allMatch(CacheView::isEmpty);
    }

    @Override
    public void forEach(Consumer action)
    {
        Objects.requireNonNull(action);
        try (ClosableIterator it = lockedIterator())
        {
            while (it.hasNext())
                action.accept(it.next());
        }
    }

    @Nonnull
    @Override
    public List asList()
    {
        List list = new LinkedList<>();
        forEach(list::add);
        return Collections.unmodifiableList(list);
    }

    @Nonnull
    @Override
    public Set asSet()
    {
        try (ChainedClosableIterator it = lockedIterator())
        {
            //because the iterator needs to retain elements to avoid duplicates,
            // we can use the resulting HashSet as our return value!
            while (it.hasNext()) it.next();
            return Collections.unmodifiableSet(it.getItems());
        }
    }

    @Nonnull
    @Override
    public ChainedClosableIterator lockedIterator()
    {
        Iterator gen = generator.get().iterator();
        return new ChainedClosableIterator<>(gen);
    }

    @Nonnull
    @Override
    public List getElementsByName(@Nonnull String name, boolean ignoreCase)
    {
        return distinctStream()
                .flatMap(view -> view.getElementsByName(name, ignoreCase).stream())
                .distinct()
                .collect(Helpers.toUnmodifiableList());
    }

    @Nonnull
    @Override
    public Stream stream()
    {
        return distinctStream().flatMap(CacheView::stream).distinct();
    }

    @Nonnull
    @Override
    public Stream parallelStream()
    {
        return distinctStream().flatMap(CacheView::parallelStream).distinct();
    }

    @Nonnull
    @Override
    public Iterator iterator()
    {
        return stream().iterator();
    }

    protected Stream distinctStream()
    {
        return generator.get().distinct();
    }

    public static class UnifiedSnowflakeCacheView
        extends UnifiedCacheViewImpl> implements SnowflakeCacheView
    {
        public UnifiedSnowflakeCacheView(Supplier>> generator)
        {
            super(generator);
        }

        @Override
        public T getElementById(long id)
        {
            return generator.get()
                .map(view -> view.getElementById(id))
                .filter(Objects::nonNull)
                .findFirst().orElse(null);
        }
    }

    public static class UnifiedMemberCacheViewImpl
        extends UnifiedCacheViewImpl implements UnifiedMemberCacheView
    {

        public UnifiedMemberCacheViewImpl(Supplier> generator)
        {
            super(generator);
        }

        @Nonnull
        @Override
        public List getElementsById(long id)
        {
            return distinctStream()
                .map(view -> view.getElementById(id))
                .filter(Objects::nonNull)
                .collect(Helpers.toUnmodifiableList());
        }

        @Nonnull
        @Override
        public List getElementsByUsername(@Nonnull String name, boolean ignoreCase)
        {
            return distinctStream()
                .flatMap(view -> view.getElementsByUsername(name, ignoreCase).stream())
                .collect(Helpers.toUnmodifiableList());
        }

        @Nonnull
        @Override
        public List getElementsByNickname(@Nullable String name, boolean ignoreCase)
        {
            return distinctStream()
                .flatMap(view -> view.getElementsByNickname(name, ignoreCase).stream())
                .collect(Helpers.toUnmodifiableList());
        }

        @Nonnull
        @Override
        public List getElementsWithRoles(@Nonnull Role... roles)
        {
            return distinctStream()
                .flatMap(view -> view.getElementsWithRoles(roles).stream())
                .collect(Helpers.toUnmodifiableList());
        }

        @Nonnull
        @Override
        public List getElementsWithRoles(@Nonnull Collection roles)
        {
            return distinctStream()
                .flatMap(view -> view.getElementsWithRoles(roles).stream())
                .collect(Helpers.toUnmodifiableList());
        }
    }
}