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package com.github.davidmoten.rx.jdbc.tuple;

import static com.github.davidmoten.rx.jdbc.Util.mapObject;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import rx.functions.Func1;

/**
 * Utility methods for tuples.
 */
public final class Tuples {

	/**
	 * Private constructor to prevent instantiation.
	 */
	private Tuples() {
		// prevent instantiation.
	}

	public static final  Func1 single(final Class cls) {
		return new Func1() {

			@SuppressWarnings("unchecked")
			@Override
			public T call(ResultSet rs) {
				return (T) mapObject(rs, cls, 1);
			}

		};
	}

	public static final  Func1> tuple(
			final Class cls1, final Class cls2) {
		return new Func1>() {

			@SuppressWarnings("unchecked")
			@Override
			public Tuple2 call(ResultSet rs) {
				return new Tuple2((T1) mapObject(rs, cls1, 1),
						(T2) mapObject(rs, cls2, 2));
			}
		};
	}

	public static final  Func1> tuple(
			final Class cls1, final Class cls2, final Class cls3) {
		return new Func1>() {
			@SuppressWarnings("unchecked")
			@Override
			public Tuple3 call(ResultSet rs) {
				return new Tuple3((T1) mapObject(rs, cls1, 1),
						(T2) mapObject(rs, cls2, 2),
						(T3) mapObject(rs, cls3, 3));
			}
		};
	}

	public static final  Func1> tuple(
			final Class cls1, final Class cls2, final Class cls3,
			final Class cls4) {
		return new Func1>() {
			@SuppressWarnings("unchecked")
			@Override
			public Tuple4 call(ResultSet rs) {
				return new Tuple4((T1) mapObject(rs, cls1, 1),
						(T2) mapObject(rs, cls2, 2),
						(T3) mapObject(rs, cls3, 3),
						(T4) mapObject(rs, cls4, 4));
			}
		};
	}

	public static final  Func1> tuple(
			final Class cls1, final Class cls2, final Class cls3,
			final Class cls4, final Class cls5) {
		return new Func1>() {
			@SuppressWarnings("unchecked")
			@Override
			public Tuple5 call(ResultSet rs) {
				return new Tuple5((T1) mapObject(rs, cls1,
						1), (T2) mapObject(rs, cls2, 2), (T3) mapObject(rs,
						cls3, 3), (T4) mapObject(rs, cls4, 4), (T5) mapObject(
						rs, cls5, 5));
			}
		};
	}

	public static final  Func1> tuple(
			final Class cls1, final Class cls2, final Class cls3,
			final Class cls4, final Class cls5, final Class cls6) {

		return new Func1>() {
			@SuppressWarnings("unchecked")
			@Override
			public Tuple6 call(ResultSet rs) {
				return new Tuple6((T1) mapObject(rs,
						cls1, 1), (T2) mapObject(rs, cls2, 2), (T3) mapObject(
						rs, cls3, 3), (T4) mapObject(rs, cls4, 4),
						(T5) mapObject(rs, cls5, 5),
						(T6) mapObject(rs, cls6, 6));
			}
		};
	}

	public static final  Func1> tuple(
			final Class cls1, final Class cls2, final Class cls3,
			final Class cls4, final Class cls5, final Class cls6,
			final Class cls7) {

		return new Func1>() {
			@SuppressWarnings("unchecked")
			@Override
			public Tuple7 call(ResultSet rs) {
				return new Tuple7((T1) mapObject(
						rs, cls1, 1), (T2) mapObject(rs, cls2, 2),
						(T3) mapObject(rs, cls3, 3),
						(T4) mapObject(rs, cls4, 4),
						(T5) mapObject(rs, cls5, 5),
						(T6) mapObject(rs, cls6, 6),
						(T7) mapObject(rs, cls7, 7));
			}
		};
	}

	public static final  Func1> tupleN(
			final Class cls) {
		return new Func1>() {
			@Override
			public TupleN call(ResultSet rs) {
				return toTupleN(cls, rs);
			}
		};
	}

	@SuppressWarnings("unchecked")
	private static  TupleN toTupleN(final Class cls, ResultSet rs) {
		try {
			int n = rs.getMetaData().getColumnCount();
			List list = new ArrayList();
			for (int i = 1; i <= n; i++) {
				list.add((T) mapObject(rs, cls, i));
			}
			return new TupleN(list);
		} catch (SQLException e) {
			throw new RuntimeException(e);
		}
	}
}