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using System;
using System.Collections.Generic;
using NUnit.Framework;
using XenAdmin;
using XenAdmin.Wizards.ExportWizard.ApplianceChecks;

namespace XenAdminTests.UnitTests
{
    [TestFixture, Category(TestCategories.Unit)]
    public class ApplianceExistsCheckTests
    {
        #region Test Helpers

        private class ApplianceExistsCheckStaticOverrides : ApplianceExistsCheck
        {
            public ApplianceExistsCheckStaticOverrides(string destinationDirectory, string fileName, FileExtension extension)
                : base(destinationDirectory, fileName, extension)
            {
                FileExistsCalls = DirectoryExistsCalls = 0;
            }

            private bool directoryExistsValue;

            public bool DirectoryExistsValue
            {
                set { directoryExistsValue = value; }
                private get
                {
                    DirectoryExistsCalls++;
                    return directoryExistsValue;
                }
            }

            private bool fileExistsValue;

            public bool FileExistsValue
            {
                set { fileExistsValue = value; }
                private get
                {
                    FileExistsCalls++;
                    return fileExistsValue;
                }
            }

            public int DirectoryExistsCalls { get; private set; }
            public int FileExistsCalls { get; private set; }

            protected override bool DirectoryExists(string directory)
            {
                return DirectoryExistsValue;
            }

            protected override bool FileExists(string directory)
            {
                return FileExistsValue;
            }
        }

        public class TestCase
        {
            public bool DirFound { get; set; }
            public bool FileFound { get; set; }
            public bool Valid { get; set; }

            public override string ToString()
            {
                return $"DirFound: {DirFound}; File found: {FileFound}; Valid: {Valid}";
            }
        }

        #endregion

        #region Test Data

        private const string directoryName = @"C:\Some\Fake\Dir\Name";
        private const string fileName = "fileName";
        private readonly string errorMessage = Messages.EXPORT_APPLIANCE_PAGE_ERROR_APP_EXISTS;
        private readonly string noErrorMessage = string.Empty;

        private static IEnumerable<TestCase> TestCases
        {
            get
            {
                yield return new TestCase {DirFound = true, FileFound = true, Valid = false};
                yield return new TestCase {DirFound = false, FileFound = true, Valid = false};
                yield return new TestCase {DirFound = true, FileFound = false, Valid = true};
                yield return new TestCase {DirFound = false, FileFound = false, Valid = true};
            }
        }

        #endregion

        [Test, TestCaseSource(typeof(ApplianceExistsCheckTests), nameof(TestCases))]
        public void TestOvfOvaValidation(TestCase tc)
        {
            ApplianceExistsCheckStaticOverrides checker = new ApplianceExistsCheckStaticOverrides(directoryName, fileName, ApplianceCheck.FileExtension.ovaovf)
            {
                DirectoryExistsValue = tc.DirFound,
                FileExistsValue = tc.FileFound
            };
            checker.Validate();
            Assert.That(checker.IsValid, Is.EqualTo(tc.Valid), "Is valid test -> " + tc);
            Assert.That(checker.DirectoryExistsCalls, Is.EqualTo(1), "dir exists calls -> " + tc);
            Assert.That(checker.FileExistsCalls, Is.InRange(1, 2), "file exists calls -> " + tc);
        }

        [Test, TestCaseSource(typeof(ApplianceExistsCheckTests), nameof(TestCases))]
        public void TestXvaValidation(TestCase tc)
        {
            ApplianceExistsCheckStaticOverrides checker = new ApplianceExistsCheckStaticOverrides(directoryName, fileName, ApplianceCheck.FileExtension.xva)
            {
                DirectoryExistsValue = tc.DirFound,
                FileExistsValue = tc.FileFound
            };
            checker.Validate();
            Assert.That(checker.IsValid, Is.EqualTo(tc.Valid), "Is valid test -> " + tc);
            Assert.That(checker.DirectoryExistsCalls, Is.EqualTo(0), "dir exists calls -> " + tc);
            Assert.That(checker.FileExistsCalls, Is.EqualTo(1), "file exists calls -> " + tc);
        }

        [Test]
        [TestCase(true)]
        [TestCase(false)]
        public void ErrorMessagesValidation(bool valid)
        {
            ApplianceExistsCheckStaticOverrides checker = new ApplianceExistsCheckStaticOverrides(directoryName,
                fileName,
                ApplianceCheck.FileExtension.xva)
            {
                DirectoryExistsValue = !valid,
                FileExistsValue = !valid
            };
            checker.Validate();
            Assert.That(checker.IsValid, Is.EqualTo(valid), "Is valid");
            string error = valid ? noErrorMessage : errorMessage;
            Assert.That(checker.ErrorReason, Is.EqualTo(error), "Error message");
        }

        [Test]
        public void DefaultCase()
        {
            ApplianceCheck checker = new ApplianceExistsCheck(directoryName, fileName,
                ApplianceCheck.FileExtension.ovaovf);
            Assert.That(checker.IsValid, Is.False, "Is valid");
            Assert.That(checker.ErrorReason, Is.EqualTo(errorMessage), "error message");
        }

        [Test]
        public void NullPaths()
        {
            Assert.Throws(typeof(ArgumentNullException), () =>
            {
                var checker = new ApplianceExistsCheck(null, null, ApplianceCheck.FileExtension.ovaovf);
                checker.Validate();
            });
        }

    }
}