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Official client for Redis Search
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package io.redisearch.aggregation;

import io.redisearch.aggregation.reducers.Reducer;
import redis.clients.jedis.util.SafeEncoder;

import java.util.*;

/**
 * @author Guy Korland
 */
public class AggregationBuilder {

  private final List args = new ArrayList<>();
  private boolean isWithCursor = false;

  public AggregationBuilder(String query) {
    args.add(query);
  }

  public AggregationBuilder() {
    this("*");
  }

  public AggregationBuilder load(String ...fields) {
    addCmdArgs(args, "LOAD", Arrays.asList(fields));
    return this;
  }

  public AggregationBuilder limit(int offset, int count) {
    Limit limit = new Limit(offset, count);
    limit.addArgs(args);
    return this;
  }

  public AggregationBuilder limit(int count) {
    return limit(0, count);
  }

  public AggregationBuilder sortBy(SortedField ...fields) {
    args.add("SORTBY");
    args.add(Integer.toString(fields.length * 2));
    for (SortedField field : fields) {
      args.add(field.getField());
      args.add(field.getOrder());
    }        

    return this;
  }

  public AggregationBuilder sortBy(int max, SortedField ...fields) {
    sortBy(fields);
    if (max > 0) {
      args.add("MAX");
      args.add(Integer.toString(max));
    }
    return this;
  }

  public AggregationBuilder sortByAsc(String field) {
    return sortBy(SortedField.asc(field));
  }

  public AggregationBuilder sortByDesc(String field) {
    return sortBy(SortedField.desc(field));
  }

  public AggregationBuilder apply(String projection, String alias) {
    args.add("APPLY");
    args.add(projection);
    args.add("AS");
    args.add(alias);
    return this;
  }

  public AggregationBuilder groupBy(Collection fields, Collection reducers) {
    String[] fieldsArr = new String[fields.size()];
    Group g = new Group(fields.toArray(fieldsArr));
    for (Reducer r : reducers) {
      g.reduce(r);
    }
    groupBy(g);
    return this;
  }

  public AggregationBuilder groupBy(String field, Reducer ...reducers) {
    return groupBy(Collections.singletonList(field), Arrays.asList(reducers));
  }

  public AggregationBuilder groupBy(Group group) {
    args.add("GROUPBY");
    group.addArgs(args);
    return this;
  }

  public AggregationBuilder filter(String expression) {
    args.add("FILTER");
    args.add(expression);
    return this;
  }

  public AggregationBuilder cursor(int count, long maxIdle) {
    isWithCursor = true;
    if(count > 0) {
      args.add("WITHCURSOR");
      args.add("COUNT");
      args.add(Integer.toString(count));
      if(maxIdle < Long.MAX_VALUE && maxIdle>=0) {
        args.add("MAXIDLE");
        args.add(Long.toString(maxIdle));
      }
    }
    return this;
  }

  private static void addCmdLen(List list, String cmd, int len) {
    list.add(cmd);
    list.add(Integer.toString(len));

  }
  private static void addCmdArgs(List dst, String cmd, List src) {
    addCmdLen(dst, cmd, src.size());
    dst.addAll(src);
  }

  public List getArgs() {
    return Collections.unmodifiableList(args);
  }

  public void serializeRedisArgs(List redisArgs) {
    for (String s : getArgs()) {
      redisArgs.add(SafeEncoder.encode(s));
    }
  }

  public String getArgsString() {
    StringJoiner sj = new StringJoiner(" ");
    for (String s : getArgs()) {
      sj.add(s);
    }
    return sj.toString();
  }
  
  public boolean isWithCursor() {
    return isWithCursor;
  }
}