using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Linq;

namespace Falcon.SugarApi.Test
{

    /// <summary>
    /// 字符串扩展方法测试
    /// </summary>
    [TestClass]
    public class StringExtendTest
    {
        [TestMethod]
        public void TestSplit() {
            var str = $"a,b.c;d，e。f；g";
            var strArr = str.SplitStr();
            Assert.AreEqual(7,strArr.Length,"分割后长度应该为7");
            str = "a,,,    ,b    ,c    c,";
            strArr = str.SplitStr();
            Assert.AreEqual(3,strArr.Length,"分割后长度应该为3");
            Assert.AreEqual("a",strArr[0]);
            Assert.AreEqual("b",strArr[1]);
            Assert.AreEqual("c    c",strArr[2]);
            str = null;
            strArr = str.SplitStr();
            Assert.IsNotNull(strArr);
            Assert.AreEqual(0,strArr.Length);

            //指定分隔符
            str = $"a,b.c;d，e。f；g";

            strArr = str.SplitStr(',');
            Assert.AreEqual(2,strArr.Length,"分割后长度应该为7");
            Assert.AreEqual("a",strArr[0]);
            Assert.AreEqual("b.c;d，e。f；g",strArr[1]);

            strArr = str.SplitStr(',','.');
            Assert.AreEqual(3,strArr.Length,"分割后长度应该为7");
            Assert.AreEqual("a",strArr[0]);
            Assert.AreEqual("b",strArr[1]);
            Assert.AreEqual("c;d，e。f；g",strArr[2]);
        }

        /// <summary>
        /// 测试ToDefault
        /// </summary>
        [TestMethod]
        public void TestToDefault() {
            var str = "";
            var r = "";
            r = str.ToDefault("abc");
            Assert.AreEqual("abc",r);
            str = null;
            r = str.ToDefault("abc");
            Assert.AreEqual("abc",r);
            str = "123";
            r = str.ToDefault("abc");
            Assert.AreEqual("123",r);
        }

        /// <summary>
        /// 检索子字符串测试
        /// </summary>
        [TestMethod]
        public void TestSubstringEx() {
            var str = "abcd33";
            string r;
            r = str.SubstringEx(str.Length + 1,1);
            Assert.IsTrue(r == "");
            r = str.SubstringEx(0,0);
            Assert.IsTrue(r == "");
            r = str.SubstringEx(3,-1);
            Assert.IsTrue(r == "c");
            r = str.SubstringEx(3,10);
            Assert.IsTrue(r == "d33");
            r = str.SubstringEx(-1,2);
            Assert.IsTrue(r == "a");
            r = str.SubstringEx(1,2);
            Assert.IsTrue(r == "bc");

        }

        /// <summary>
        /// 按一定长度分割字符串测试
        /// </summary>
        [TestMethod]
        public void TestSplitByLength() {
            string str;
            string[] result;

            str = "";
            Assert.ThrowsException<ArgumentNullException>(() => { result = str.Split(5).ToArray(); });
            str = "abc";
            Assert.ThrowsException<Exception>(() => { result = str.Split(0).ToArray(); });
            result = str.Split(1).ToArray();
            Assert.IsTrue(result.Length == 3);
            Assert.IsTrue(result[0] == "a");
            Assert.IsTrue(result[1] == "b");
            Assert.IsTrue(result[2] == "c");

            result = str.Split(2).ToArray();
            Assert.IsTrue(result.Length == 2);
            Assert.IsTrue(result[0] == "ab");
            Assert.IsTrue(result[1] == "c");

            result = str.Split(3).ToArray();
            Assert.IsTrue(result.Length == 1);
            Assert.IsTrue(result[0] == "abc");

            result = str.Split(4).ToArray();
            Assert.IsTrue(result.Length == 1);
            Assert.IsTrue(result[0] == "abc");
        }

        /// <summary>
        /// 去除头尾字符
        /// </summary>
        [TestMethod]
        public void TestTrimString() {
            var str = @"abcabcffe222256256";
            //去除头部的abc字符
            var r = str.TrimString("abc");
            Assert.AreEqual(r , "ffe222256256");
            //去除尾部256字符
            r = str.TrimString("","256");
            Assert.AreEqual(r,"abcabcffe222");
            //去除头部abc字符和尾部256字符
            r = str.TrimString("abc","256");
            Assert.AreEqual(r,"ffe222");
        }
    }
}