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package com.redis.spring.batch.writer;

import java.util.Collection;
import java.util.List;
import java.util.function.Function;

import org.springframework.util.CollectionUtils;

import io.lettuce.core.RedisFuture;
import io.lettuce.core.StreamMessage;
import io.lettuce.core.XAddArgs;
import io.lettuce.core.api.async.BaseRedisAsyncCommands;
import io.lettuce.core.api.async.RedisStreamAsyncCommands;

public class XaddAll implements WriteOperation {

	private final Function>> messagesFunction;
	private Function, XAddArgs> argsFunction = m -> new XAddArgs().id(m.getId());

	public XaddAll(Function>> messagesFunction) {
		this.messagesFunction = messagesFunction;
	}

	public XaddAll args(XAddArgs args) {
		return args(t -> args);
	}

	public XaddAll args(Function, XAddArgs> function) {
		this.argsFunction = function;
		return this;
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public void execute(BaseRedisAsyncCommands commands, Iterable items,
			List> futures) {
		RedisStreamAsyncCommands streamCommands = (RedisStreamAsyncCommands) commands;
		for (T item : items) {
			Collection> messages = messagesFunction.apply(item);
			if (CollectionUtils.isEmpty(messages)) {
				continue;
			}
			for (StreamMessage message : messages) {
				XAddArgs args = argsFunction.apply(message);
				futures.add((RedisFuture) streamCommands.xadd(message.getStream(), args, message.getBody()));
			}
		}
	}

	public static  XaddAll of(Function>> messages,
			Function, XAddArgs> args) {
		return new XaddAll<>(messages).args(args);
	}

}