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/**
 * Copyright (c) 2013-2022 Nikita Koksharov
 *
 * 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 org.redisson.spring.data.connection;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;

import org.reactivestreams.Publisher;
import org.redisson.ScanResult;
import org.redisson.api.RFuture;
import org.redisson.client.RedisClient;
import org.redisson.client.codec.ByteArrayCodec;
import org.redisson.client.codec.StringCodec;
import org.redisson.client.protocol.RedisCommand;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.client.protocol.RedisStrictCommand;
import org.redisson.client.protocol.decoder.ListScanResult;
import org.redisson.reactive.CommandReactiveExecutor;
import org.redisson.reactive.SetReactiveIterator;
import org.springframework.data.redis.connection.ReactiveRedisConnection.BooleanResponse;
import org.springframework.data.redis.connection.ReactiveRedisConnection.ByteBufferResponse;
import org.springframework.data.redis.connection.ReactiveRedisConnection.CommandResponse;
import org.springframework.data.redis.connection.ReactiveRedisConnection.KeyCommand;
import org.springframework.data.redis.connection.ReactiveRedisConnection.KeyScanCommand;
import org.springframework.data.redis.connection.ReactiveRedisConnection.NumericResponse;
import org.springframework.data.redis.connection.ReactiveSetCommands;
import org.springframework.util.Assert;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

/**
 * 
 * @author Nikita Koksharov
 *
 */
public class RedissonReactiveSetCommands extends RedissonBaseReactive implements ReactiveSetCommands {

    RedissonReactiveSetCommands(CommandReactiveExecutor executorService) {
        super(executorService);
    }

    private static final RedisCommand SADD = new RedisCommand("SADD");
    
    @Override
    public Flux> sAdd(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");
            Assert.notNull(command.getValues(), "Values must not be null!");

            List args = new ArrayList(command.getValues().size() + 1);
            args.add(toByteArray(command.getKey()));
            args.addAll(command.getValues().stream().map(v -> toByteArray(v)).collect(Collectors.toList()));
            
            byte[] keyBuf = toByteArray(command.getKey());
            Mono m = write(keyBuf, StringCodec.INSTANCE, SADD, args.toArray());
            return m.map(v -> new NumericResponse<>(command, v));
        });
    }

    private static final RedisCommand SREM = new RedisCommand("SREM");
    
    @Override
    public Flux> sRem(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");
            Assert.notNull(command.getValues(), "Values must not be null!");

            List args = new ArrayList(command.getValues().size() + 1);
            args.add(toByteArray(command.getKey()));
            args.addAll(command.getValues().stream().map(v -> toByteArray(v)).collect(Collectors.toList()));
            
            Mono m = write((byte[])args.get(0), StringCodec.INSTANCE, SREM, args.toArray());
            return m.map(v -> new NumericResponse<>(command, v));
        });
    }

    @Override
    public Flux sPop(SPopCommand command) {
        Assert.notNull(command.getKey(), "Key must not be null!");
        
        byte[] keyBuf = toByteArray(command.getKey());
        Mono> m = write(keyBuf, ByteArrayCodec.INSTANCE, RedisCommands.SPOP, keyBuf, command.getCount());
        return m.flatMapMany(v -> Flux.fromIterable(v).map(e -> ByteBuffer.wrap(e)));
    }

    @Override
    public Flux> sPop(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");

            byte[] keyBuf = toByteArray(command.getKey());
            Mono m = write(keyBuf, ByteArrayCodec.INSTANCE, RedisCommands.SPOP_SINGLE, keyBuf);
            return m.map(v -> new ByteBufferResponse<>(command, ByteBuffer.wrap(v)));
        });
    }

    @Override
    public Flux> sMove(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");
            Assert.notNull(command.getDestination(), "Destination key must not be null!");
            Assert.notNull(command.getValue(), "Value must not be null!");

            byte[] keyBuf = toByteArray(command.getKey());
            byte[] destinationBuf = toByteArray(command.getDestination());
            byte[] valueBuf = toByteArray(command.getValue());
            Mono m = write(keyBuf, ByteArrayCodec.INSTANCE, RedisCommands.SMOVE, keyBuf, destinationBuf, valueBuf);
            return m.map(v -> new BooleanResponse<>(command, v));
        });
    }

    private static final RedisStrictCommand SCARD = new RedisStrictCommand("SCARD");
    
    @Override
    public Flux> sCard(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");

            byte[] keyBuf = toByteArray(command.getKey());
            Mono m = write(keyBuf, StringCodec.INSTANCE, SCARD, keyBuf);
            return m.map(v -> new NumericResponse<>(command, v));
        });
    }

    @Override
    public Flux> sIsMember(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");
            Assert.notNull(command.getValue(), "Value must not be null!");

            byte[] keyBuf = toByteArray(command.getKey());
            byte[] valueBuf = toByteArray(command.getValue());
            Mono m = read(keyBuf, StringCodec.INSTANCE, RedisCommands.SISMEMBER, keyBuf, valueBuf);
            return m.map(v -> new BooleanResponse<>(command, v));
        });
    }

    @Override
    public Flux>> sInter(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKeys(), "Key must not be null!");

            List list = command.getKeys().stream().map(v -> toByteArray(v)).collect(Collectors.toList());
            Mono> m = write((byte[])list.get(0), ByteArrayCodec.INSTANCE, RedisCommands.SINTER, list.toArray());
            return m.map(v -> new CommandResponse<>(command, 
                                    Flux.fromIterable(v).map(e -> ByteBuffer.wrap(e))));
        });
    }

    @Override
    public Flux> sInterStore(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKeys(), "Keys must not be null!");
            Assert.notNull(command.getKey(), "Destination key must not be null!");

            List args = new ArrayList(command.getKeys().size() + 1);
            args.add(toByteArray(command.getKey()));
            args.addAll(command.getKeys().stream().map(v -> toByteArray(v)).collect(Collectors.toList()));

            Mono m = write((byte[])args.get(0), StringCodec.INSTANCE, RedisCommands.SINTERSTORE, args.toArray());
            return m.map(v -> new NumericResponse<>(command, v));
        });
    }

    @Override
    public Flux>> sUnion(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKeys(), "Key must not be null!");

            List list = command.getKeys().stream().map(v -> toByteArray(v)).collect(Collectors.toList());
            Mono> m = write((byte[])list.get(0), ByteArrayCodec.INSTANCE, RedisCommands.SUNION, list.toArray());
            return m.map(v -> new CommandResponse<>(command, 
                                    Flux.fromIterable(v).map(e -> ByteBuffer.wrap(e))));
        });
    }

    @Override
    public Flux> sUnionStore(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKeys(), "Keys must not be null!");
            Assert.notNull(command.getKey(), "Destination key must not be null!");

            List args = new ArrayList(command.getKeys().size() + 1);
            args.add(toByteArray(command.getKey()));
            args.addAll(command.getKeys().stream().map(v -> toByteArray(v)).collect(Collectors.toList()));

            Mono m = write((byte[])args.get(0), StringCodec.INSTANCE, RedisCommands.SUNIONSTORE, args.toArray());
            return m.map(v -> new NumericResponse<>(command, v));
        });
    }

    @Override
    public Flux>> sDiff(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKeys(), "Key must not be null!");

            List list = command.getKeys().stream().map(v -> toByteArray(v)).collect(Collectors.toList());
            Mono> m = write((byte[])list.get(0), ByteArrayCodec.INSTANCE, RedisCommands.SDIFF, list.toArray());
            return m.map(v -> new CommandResponse<>(command, 
                                    Flux.fromIterable(v).map(e -> ByteBuffer.wrap(e))));
        });
    }

    @Override
    public Flux> sDiffStore(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKeys(), "Keys must not be null!");
            Assert.notNull(command.getKey(), "Destination key must not be null!");

            List args = new ArrayList(command.getKeys().size() + 1);
            args.add(toByteArray(command.getKey()));
            args.addAll(command.getKeys().stream().map(v -> toByteArray(v)).collect(Collectors.toList()));

            Mono m = write((byte[])args.get(0), StringCodec.INSTANCE, RedisCommands.SDIFFSTORE, args.toArray());
            return m.map(v -> new NumericResponse<>(command, v));
        });
    }

    @Override
    public Flux>> sMembers(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");

            byte[] keyBuf = toByteArray(command.getKey());
            Mono> m = read(keyBuf, ByteArrayCodec.INSTANCE, RedisCommands.SMEMBERS, keyBuf);
            return m.map(v -> new CommandResponse<>(command, Flux.fromIterable(v).map(e -> ByteBuffer.wrap(e))));
        });
    }

    @Override
    public Flux>> sScan(Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");
            Assert.notNull(command.getOptions(), "ScanOptions must not be null!");
            
            byte[] keyBuf = toByteArray(command.getKey());
            Flux flux = Flux.create(new SetReactiveIterator() {
                @Override
                protected RFuture> scanIterator(RedisClient client, long nextIterPos) {
                    if (command.getOptions().getPattern() == null) {
                        return executorService.readAsync(client, keyBuf, ByteArrayCodec.INSTANCE, RedisCommands.SSCAN, 
                                keyBuf, nextIterPos, "COUNT", Optional.ofNullable(command.getOptions().getCount()).orElse(10L));
                    }

                    return executorService.readAsync(client, keyBuf, ByteArrayCodec.INSTANCE, RedisCommands.SSCAN, 
                                keyBuf, nextIterPos, "MATCH", command.getOptions().getPattern(), 
                                                    "COUNT", Optional.ofNullable(command.getOptions().getCount()).orElse(10L));
                }
            });
            return Mono.just(new CommandResponse<>(command, flux.map(v -> ByteBuffer.wrap(v))));
        });
    }

    @Override
    public Flux>> sRandMember(
            Publisher commands) {
        return execute(commands, command -> {

            Assert.notNull(command.getKey(), "Key must not be null!");

            byte[] keyBuf = toByteArray(command.getKey());
            Mono> m = read(keyBuf, ByteArrayCodec.INSTANCE, RedisCommands.SRANDMEMBER, keyBuf, command.getCount().orElse(1L));
            return m.map(v -> new CommandResponse<>(command, Flux.fromIterable(v).map(e -> ByteBuffer.wrap(e))));
        });
    }

}
    

    

    

            

    

            



    
    






    
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