package redis.clients.jedis;

import redis.clients.jedis.exceptions.JedisDataException;

import java.util.ArrayList;
import java.util.List;

public class Pipeline extends MultiKeyPipelineBase {
	
    private MultiResponseBuilder currentMulti;
    
    private class MultiResponseBuilder extends Builder<List<Object>>{
    	private List<Response<?>> responses = new ArrayList<Response<?>>();
		
		@Override
		public List<Object> build(Object data) {
			@SuppressWarnings("unchecked")
			List<Object> list = (List<Object>)data;
			List<Object> values = new ArrayList<Object>();
			
			if(list.size() != responses.size()){
				throw new JedisDataException("Expected data size " + responses.size() + " but was " + list.size());
			}
			
			for(int i=0;i<list.size();i++){
				Response<?> response = responses.get(i);
				response.set(list.get(i));
				values.add(response.get());
			}
			return values;
		}

		public void addResponse(Response<?> response){
			responses.add(response);
		}
    }

    @Override
    protected <T> Response<T> getResponse(Builder<T> builder) {
    	if(currentMulti != null){
    		super.getResponse(BuilderFactory.STRING); //Expected QUEUED
    		
    		Response<T> lr = new Response<T>(builder);
    		currentMulti.addResponse(lr);
    		return lr;
    	}
    	else{
    		return super.getResponse(builder);
    	}
    }

    public void setClient(Client client) {
        this.client = client;
    }

    @Override
    protected Client getClient(byte[] key) {
        return client;
    }

    @Override
    protected Client getClient(String key) {
        return client;
    }
    
    public Object getOneWithJedisDataException() {
    	try {
    		return client.getOne();
    	} catch (JedisDataException e) {
    		return e;
    	}
    }
    
    /**
     * Syncronize pipeline by reading all responses. This operation close the
     * pipeline. In order to get return values from pipelined commands, capture
     * the different Response<?> of the commands you execute.
     */
    public void sync() {
    	while (hasPipelinedResponse()) {
    		generateResponse(getOneWithJedisDataException());
    	}
    }

    /**
     * Syncronize pipeline by reading all responses. This operation close the
     * pipeline. Whenever possible try to avoid using this version and use
     * Pipeline.sync() as it won't go through all the responses and generate the
     * right response type (usually it is a waste of time).
     * 
     * @return A list of all the responses in the order you executed them.
     */
    public List<Object> syncAndReturnAll() {
        List<Object> formatted = new ArrayList<Object>();
        
        while (hasPipelinedResponse()) {
        	try {
            	formatted.add(generateResponse(getOneWithJedisDataException()).get());
            } catch (JedisDataException e) {
                formatted.add(e);
            }
        }
        return formatted;
    }

    public Response<String> discard() {
        client.discard();
        currentMulti = null;
        return getResponse(BuilderFactory.STRING);
    }

    public Response<List<Object>> exec() {
        client.exec();
        Response<List<Object>> response = super.getResponse(currentMulti);
        currentMulti = null;
        return response;
    }

    public Response<String> multi() {
        client.multi();
        Response<String> response = getResponse(BuilderFactory.STRING); //Expecting OK
        currentMulti = new MultiResponseBuilder();
        return response;
    }

}