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package br.com.anteros.nosql.persistence.mongodb.aggregation;

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

import static java.util.Arrays.asList;

public final class Group {
	private final String name;
	private Group nested;
	private List projections;
	private Accumulator accumulator;
	private String sourceField;

	private Group(final String name, final Accumulator accumulator) {
		this.name = name;
		this.accumulator = accumulator;
	}

	private Group(final String name, final String sourceField) {
		this.name = name;
		this.sourceField = "$" + sourceField;
	}

	private Group(final String name, final Projection... projections) {
		this.name = name;
		this.projections = asList(projections);
	}

	private Group(final String name, final Group nested) {
		this.name = name;
		this.nested = nested;
	}

	public static List id(final Group... fields) {
		return asList(fields);
	}

	public static Group grouping(final String name) {
		return grouping(name, name);
	}

	public static Group grouping(final String name, final Projection... projections) {
		return new Group(name, projections);
	}

	public static Group grouping(final String name, final Group group) {
		return new Group(name, group);
	}

	public static Group grouping(final String name, final String sourceField) {
		return new Group(name, sourceField);
	}

	public static Group grouping(final String name, final Accumulator accumulator) {
		return new Group(name, accumulator);
	}

	public static Accumulator addToSet(final String field) {
		return new Accumulator("$addToSet", field);
	}

	public static Accumulator average(final String field) {
		return new Accumulator("$avg", field);
	}

	public static Accumulator first(final String field) {
		return new Accumulator("$first", field);
	}

	public static Accumulator last(final String field) {
		return new Accumulator("$last", field);
	}

	public static Accumulator max(final String field) {
		return new Accumulator("$max", field);
	}

	public static Accumulator min(final String field) {
		return new Accumulator("$min", field);
	}

	public static Accumulator push(final String field) {
		return new Accumulator("$push", field);
	}

	public static Accumulator sum(final String field) {
		return new Accumulator("$sum", field);
	}

	public Accumulator getAccumulator() {
		return accumulator;
	}

	public String getName() {
		return name;
	}

	public String getSourceField() {
		return sourceField;
	}

	public List getProjections() {
		return projections != null ? new ArrayList(projections) : null;
	}

	public Group getNested() {
		return nested;
	}
}