using System;
using System.Threading.Tasks;
using Shouldly;
using Spectre.Console.Testing;
using Spectre.Verify.Extensions;
using VerifyXunit;
using Xunit;

namespace Spectre.Console.Tests.Unit
{
    [ExpectationPath("Widgets/Table/Rows")]
    public sealed class TableRowCollectionTests
    {
        [UsesVerify]
        public sealed class TheAddMethod
        {
            [Fact]
            public void Should_Throw_If_Columns_Are_Null()
            {
                // Given
                var table = new Table();

                // When
                var result = Record.Exception(() => table.Rows.Add(null));

                // Then
                result.ShouldBeOfType<ArgumentNullException>()
                    .ParamName.ShouldBe("columns");
            }

            [Fact]
            public void Should_Add_Row_To_Collection()
            {
                // Given
                var table = new Table();
                table.AddColumn("Column #1");

                // When
                table.Rows.Add(new[] { Text.Empty });

                // Then
                table.Rows.Count.ShouldBe(1);
            }

            [Fact]
            public void Should_Return_Index_Of_Added_Row()
            {
                // Given
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { Text.Empty });

                // When
                var result = table.Rows.Add(new[] { Text.Empty });

                // Then
                result.ShouldBe(1);
            }

            [Fact]
            [Expectation("Add")]
            public Task Should_Add_Item_At_Correct_Place()
            {
                // Given
                var console = new TestConsole();
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { new Text("1") });
                table.Rows.Add(new[] { new Text("2") });
                table.Rows.Add(new[] { new Text("3") });

                // When
                console.Write(table);

                // Then
                return Verifier.Verify(console.Output);
            }
        }

        [UsesVerify]
        public sealed class TheInsertMethod
        {
            [Fact]
            public void Should_Throw_If_Columns_Are_Null()
            {
                // Given
                var table = new Table();

                // When
                var result = Record.Exception(() => table.Rows.Insert(0, null));

                // Then
                result.ShouldBeOfType<ArgumentNullException>()
                    .ParamName.ShouldBe("columns");
            }

            [Fact]
            public void Should_Insert_Row()
            {
                // Given
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { Text.Empty });

                // When
                table.Rows.Insert(0, new[] { Text.Empty });

                // Then
                table.Rows.Count.ShouldBe(2);
            }

            [Fact]
            public void Should_Return_Index_Of_Inserted_Row()
            {
                // Given
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { new Text("1") });
                table.Rows.Add(new[] { new Text("2") });

                // When
                var result = table.Rows.Insert(1, new[] { new Text("3") });

                // Then
                result.ShouldBe(1);
            }

            [Fact]
            [Expectation("Insert")]
            public Task Should_Insert_Item_At_Correct_Place()
            {
                // Given
                var console = new TestConsole();
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { new Text("1") });
                table.Rows.Add(new[] { new Text("2") });
                table.Rows.Insert(1, new[] { new Text("3") });

                // When
                console.Write(table);

                // Then
                return Verifier.Verify(console.Output);
            }
        }

        [UsesVerify]
        public sealed class TheRemoveMethod
        {
            [Fact]
            public void Should_Throw_If_Index_Is_Negative()
            {
                // Given
                var table = new Table();
                table.AddColumn("Column #1");

                // When
                var result = Record.Exception(() => table.Rows.RemoveAt(-1));

                // Then
                result.ShouldBeOfType<IndexOutOfRangeException>()
                    .Message.ShouldBe("Table row index cannot be negative.");
            }

            [Fact]
            public void Should_Throw_If_Index_Is_Larger_Than_Number_Of_Rows()
            {
                // Given
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { new Text("1") });
                table.Rows.Add(new[] { new Text("2") });
                table.Rows.Add(new[] { new Text("3") });

                // When
                var result = Record.Exception(() => table.Rows.RemoveAt(3));

                // Then
                result.ShouldBeOfType<IndexOutOfRangeException>()
                    .Message.ShouldBe("Table row index cannot exceed the number of rows in the table.");
            }

            [Fact]
            [Expectation("Remove")]
            public Task Should_Remove_Row()
            {
                // Given
                var console = new TestConsole();
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { new Text("1") });
                table.Rows.Add(new[] { new Text("2") });
                table.Rows.Add(new[] { new Text("3") });
                table.Rows.RemoveAt(1);

                // When
                console.Write(table);

                // Then
                return Verifier.Verify(console.Output);
            }
        }

        public sealed class TheClearMethod
        {
            [Fact]
            public void Should_Remove_All_Rows()
            {
                // Given
                var table = new Table();
                table.AddColumn("Column #1");
                table.Rows.Add(new[] { new Text("1") });
                table.Rows.Add(new[] { new Text("2") });
                table.Rows.Add(new[] { new Text("3") });
                table.Rows.Clear();

                // When
                var result = table.Rows.Count;

                // Then
                result.ShouldBe(0);
            }
        }
    }
}