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/**
 * Copyright (c) 2013-2021 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.Arrays;
import java.util.List;
import java.util.stream.Collectors;

import org.redisson.SlotCallback;
import org.redisson.api.RFuture;
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.reactive.CommandReactiveExecutor;
import org.springframework.data.redis.connection.ReactiveScriptingCommands;
import org.springframework.data.redis.connection.ReturnType;

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

/**
 * 
 * @author Nikita Koksharov
 *
 */
public class RedissonReactiveScriptingCommands extends RedissonBaseReactive implements ReactiveScriptingCommands {

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

    @Override
    public Mono scriptFlush() {
        return executorService.reactive(() -> {
            RFuture f = executorService.writeAllAsync(RedisCommands.SCRIPT_FLUSH);
            return toStringFuture(f);
        });
    }

    @Override
    public Mono scriptKill() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Mono scriptLoad(ByteBuffer script) {
        return executorService.reactive(() -> {
            return executorService.writeAllAsync(StringCodec.INSTANCE, RedisCommands.SCRIPT_LOAD, new SlotCallback() {
                volatile String result;
                @Override
                public void onSlotResult(String result) {
                    this.result = result;
                }
                
                @Override
                public String onFinish() {
                    return result;
                }
            }, toByteArray(script));
        });
    }

    @Override
    public Flux scriptExists(List scriptShas) {
        Mono> m = executorService.reactive(() -> {
                return executorService.writeAllAsync(RedisCommands.SCRIPT_EXISTS, new SlotCallback, List>() {
                
                List result = new ArrayList(scriptShas.size());
                
                @Override
                public synchronized void onSlotResult(List result) {
                    for (int i = 0; i < result.size(); i++) {
                        if (this.result.size() == i) {
                            this.result.add(false);
                        }
                        this.result.set(i, this.result.get(i) | result.get(i));
                    }
                }
    
                @Override
                public List onFinish() {
                    return result;
                }
            }, scriptShas.toArray());
        });
        return m.flatMapMany(v -> Flux.fromIterable(v));
    }

    protected RedisCommand toCommand(ReturnType returnType, String name) {
        RedisCommand c = null; 
        if (returnType == ReturnType.BOOLEAN) {
            c = org.redisson.api.RScript.ReturnType.BOOLEAN.getCommand();
        } else if (returnType == ReturnType.INTEGER) {
            c = org.redisson.api.RScript.ReturnType.INTEGER.getCommand();
        } else if (returnType == ReturnType.MULTI) {
            c = org.redisson.api.RScript.ReturnType.MULTI.getCommand();
            return new RedisCommand(c, name, new BinaryConvertor());
        } else if (returnType == ReturnType.STATUS) {
            c = org.redisson.api.RScript.ReturnType.STATUS.getCommand();
        } else if (returnType == ReturnType.VALUE) {
            c = org.redisson.api.RScript.ReturnType.VALUE.getCommand();
            return new RedisCommand(c, name, new BinaryConvertor());
        }
        return new RedisCommand(c, name);
    }
    
    @Override
    public  Flux eval(ByteBuffer script, ReturnType returnType, int numKeys, ByteBuffer... keysAndArgs) {
        RedisCommand c = toCommand(returnType, "EVAL");
        List