// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.IO;
using System.Xml;
using Microsoft.Build.Construction;
using Microsoft.Build.Evaluation;
using Microsoft.Build.Execution;
using Xunit;
 
#nullable disable
 
namespace Microsoft.Build.UnitTests.OM.Instance
{
    /// <summary>
    /// Tests for ProjectTaskInstance
    /// </summary>
    public class ProjectTaskInstance_Tests
    {
        /// <summary>
        /// Test accessors
        /// </summary>
        [Fact]
        public void Accessors()
        {
            var task = GetSampleTaskInstance();
 
            Assert.Equal("t1", task.Name);
            Assert.Equal("c", task.Condition);
            Assert.Equal("coe", task.ContinueOnError);
 
            var parameters = task.Parameters;
            Assert.Equal(2, parameters.Count);
            Assert.Equal("a1", parameters["a"]);
            Assert.Equal("b1", parameters["b"]);
        }
 
        /// <summary>
        /// Generally, empty parameters aren't set on task classes at all, but there is
        /// one exception: if the empty parameter corresponds to a task class property
        /// of array type, an empty array is set on the task class.
        /// Therefore empty task parameters should be returned by the parameter list.
        /// </summary>
        [Fact]
        public void EmptyParameter()
        {
            var task = GetTaskInstance(@"<t1 a=''/>");
 
            Assert.Single(task.Parameters);
        }
 
        /// <summary>
        /// Create a TaskInstance with some parameters
        /// </summary>
        private static ProjectTaskInstance GetSampleTaskInstance()
        {
            ProjectTaskInstance task = GetTaskInstance(@"<t1 a='a1' b='b1' ContinueOnError='coe' Condition='c'/>");
 
            return task;
        }
 
        /// <summary>
        /// Return a task instance representing the task XML string passed in
        /// </summary>
        private static ProjectTaskInstance GetTaskInstance(string taskXmlString)
        {
            string content = @"
                    <Project>
                        <Target Name='t'>
                            " + taskXmlString + @"
                        </Target>
                    </Project>
                ";
 
            using ProjectRootElementFromString projectRootElementFromString = new(content);
            ProjectRootElement xml = projectRootElementFromString.Project;
            Project project = new Project(xml);
            ProjectInstance instance = project.CreateProjectInstance();
            ProjectTaskInstance task = (ProjectTaskInstance)(instance.Targets["t"].Children[0]);
            return task;
        }
    }
}