using System;
using System.Collections.Generic;
using Developpez.Dotnet.Collections;
using NUnit.Framework;

namespace Developpez.Dotnet.Tests.Collections
{
    [TestFixture]
    public class ImmutableListTests
    {
        [Test]
        public void Test_ImmutableList()
        {
            var expected = ImmutableList.Create("zoo", "bar", "foo");
            var input = ImmutableList.Create("foo", "bar", "baz");
            var inputSave = input.AsImmutable();
            var actual = input
                    .Add("foo")
                    .RemoveAt(0)
                    .Replace(0, "zoo")
                    .Insert(1, "bar")
                    .Remove("baz");
            
            Assert.AreEqual(inputSave, input, "Input collection was modified");
            Assert.AreEqual(expected, actual);
        }

        public void Test_CantModifyList()
        {
            IList<string> list = ImmutableList.Create("foo", "bar", "baz");

            var actions = new TestDelegate[]
            {
                () => list.Add("foo"),
                () => list.Clear(),
                () => list.Insert(1, "foo"),
                () => list.Remove("foo"),
                () => list.RemoveAt(0),
                () => list[0] = "foo"
            };

            foreach (var action in actions)
            {
                Assert.Throws<InvalidOperationException>(action);
            }
        }

        
    }
}