using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Xunit;

using TupleStudy;

namespace ValueTupleStudyTest
{
    /// <summary>
    /// ValueTuple 需要.net framework 4.7及以上
    /// .net framework 4.7及以下，需要Nuget引用包System.ValueTuple 库
    /// </summary>
    public class ValueTupleStudyTest
    {
        private ValueTupleStudy valueTupleStudy;

        /// <summary>
        /// 构造函数
        /// </summary>
        public ValueTupleStudyTest()
        {
            valueTupleStudy = new ValueTupleStudy();
        }

        /// <summary>
        /// 使用构造函数创建值元组
        /// </summary>
        [Fact]
        public void CreateValueTuple_Test()
        {
            //创建包含零个元组的值元组
            var zeroTuple = this.valueTupleStudy.CreateValueTuple();
            Assert.IsType<ValueTuple>(zeroTuple);

            //1个元组的值元组
            var oneTuple = valueTupleStudy.CreateValueTuple<int>(1);
            Assert.Equal(1, oneTuple.Item1);
            Assert.Equal("first", new ValueTuple<string>("first").Item1);

            //2个元组的值元组
            var twoTuple = valueTupleStudy.CreateValueTuple<int, int>(1, 2);
            Assert.Equal(1, twoTuple.Item1);
            Assert.Equal(2, twoTuple.Item2);

            //3个元组的值元组
            var threeTuple = valueTupleStudy.CreateValueTuple<int, int, int>(1, 2, 3);
            Assert.Equal(1, threeTuple.Item1);
            Assert.Equal(2, threeTuple.Item2);
            Assert.Equal(3, threeTuple.Item3);


            //4个元组的值元组
            var fourTuple = valueTupleStudy.CreateValueTuple<int, int, int, int>(1, 2, 3, 4);
            Assert.Equal(1, fourTuple.Item1);
            Assert.Equal(2, fourTuple.Item2);
            Assert.Equal(3, fourTuple.Item3);
            Assert.Equal(4, fourTuple.Item4);

            //5个元组的值元组
            var fiveTuple = valueTupleStudy.CreateValueTuple<int, int, int, int, int>(1, 2, 3, 4, 5);
            Assert.Equal(1, fiveTuple.Item1);
            Assert.Equal(2, fiveTuple.Item2);
            Assert.Equal(3, fiveTuple.Item3);
            Assert.Equal(4, fiveTuple.Item4);
            Assert.Equal(5, fiveTuple.Item5);

            //6个元组的值元组
            var sixTuple = valueTupleStudy.CreateValueTuple<int, int, int, int, int, int>(1, 2, 3, 4, 5, 6);
            Assert.Equal(1, sixTuple.Item1);
            Assert.Equal(2, sixTuple.Item2);
            Assert.Equal(3, sixTuple.Item3);
            Assert.Equal(4, sixTuple.Item4);
            Assert.Equal(5, sixTuple.Item5);
            Assert.Equal(6, sixTuple.Item6);

            //7个元组的值元组
            var sevenTuple = valueTupleStudy.CreateValueTuple<int, int, int, int, int, int, int>(1, 2, 3, 4, 5, 6, 7);
            Assert.Equal(1, sevenTuple.Item1);
            Assert.Equal(2, sevenTuple.Item2);
            Assert.Equal(3, sevenTuple.Item3);
            Assert.Equal(4, sevenTuple.Item4);
            Assert.Equal(5, sevenTuple.Item5);
            Assert.Equal(6, sevenTuple.Item6);
            Assert.Equal(7, sevenTuple.Item7);

            //8个及以上元组的值元组:元组嵌套
            var overSevenTuple = valueTupleStudy.CreateValueTuple<int, int, int, int, int, int, int, ValueTuple<int, int, int>>(1, 2, 3, 4, 5, 6, 7, new ValueTuple<int, int, int>(8, 9, 10));
            Assert.Equal(1, overSevenTuple.Item1);
            Assert.Equal(2, overSevenTuple.Item2);
            Assert.Equal(3, overSevenTuple.Item3);
            Assert.Equal(4, overSevenTuple.Item4);
            Assert.Equal(5, overSevenTuple.Item5);
            Assert.Equal(6, overSevenTuple.Item6);
            Assert.Equal(7, overSevenTuple.Item7);

            //元组嵌套
            Assert.Equal(8, overSevenTuple.Item8);
            Assert.Equal(9, overSevenTuple.Item9);
            Assert.Equal(10, overSevenTuple.Item10);

            //16个以上，要审视程序设计,是否确实需要使用ValueTuple，最好改成设计成类
        }
    }
}