// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using Microsoft.AspNetCore.Routing.Patterns;
using Xunit;

namespace Microsoft.AspNetCore.Routing.Template
{
    public class TemplateSegmentTest
    {
        [Fact]
        public void Ctor_RoutePatternPathSegment_ShouldThrowArgumentNullExceptionWhenOtherIsNull()
        {
            const RoutePatternPathSegment other = null;

            var actual = Assert.ThrowsAny<ArgumentNullException>(() => new TemplateSegment(other));
            Assert.Equal(nameof(other), actual.ParamName);
        }

        [Fact]
        public void ToRoutePatternPathSegment()
        {
            // Arrange
            var literalPartA = RoutePatternFactory.LiteralPart("A");
            var paramPartB = RoutePatternFactory.ParameterPart("B");
            var paramPartC = RoutePatternFactory.ParameterPart("C");
            var paramPartD = RoutePatternFactory.ParameterPart("D");
            var separatorPartE = RoutePatternFactory.SeparatorPart("E");
            var templateSegment = new TemplateSegment(RoutePatternFactory.Segment(paramPartC, literalPartA, separatorPartE, paramPartB));

            // Act
            var routePatternPathSegment = templateSegment.ToRoutePatternPathSegment();
            templateSegment.Parts[1] = new TemplatePart(RoutePatternFactory.ParameterPart("D"));
            templateSegment.Parts.RemoveAt(0);

            // Assert
            Assert.Equal(4, routePatternPathSegment.Parts.Count);
            Assert.IsType<RoutePatternParameterPart>(routePatternPathSegment.Parts[0]);
            Assert.Equal(paramPartC.Name, ((RoutePatternParameterPart) routePatternPathSegment.Parts[0]).Name);
            Assert.IsType<RoutePatternLiteralPart>(routePatternPathSegment.Parts[1]);
            Assert.Equal(literalPartA.Content, ((RoutePatternLiteralPart) routePatternPathSegment.Parts[1]).Content);
            Assert.IsType<RoutePatternSeparatorPart>(routePatternPathSegment.Parts[2]);
            Assert.Equal(separatorPartE.Content, ((RoutePatternSeparatorPart) routePatternPathSegment.Parts[2]).Content);
            Assert.IsType<RoutePatternParameterPart>(routePatternPathSegment.Parts[3]);
            Assert.Equal(paramPartB.Name, ((RoutePatternParameterPart) routePatternPathSegment.Parts[3]).Name);
        }
    }
}