// Copyright (c) Umbraco.
// See LICENSE for more details.

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Reflection;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using Moq;
using NUnit.Framework;
using Umbraco.Cms.Core;
using Umbraco.Cms.Core.Cache;
using Umbraco.Cms.Core.Composing;
using Umbraco.Cms.Core.Configuration;
using Umbraco.Cms.Core.Configuration.Models;
using Umbraco.Cms.Core.Diagnostics;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Hosting;
using Umbraco.Cms.Core.IO;
using Umbraco.Cms.Core.Logging;
using Umbraco.Cms.Core.Mail;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Models.Entities;
using Umbraco.Cms.Core.Models.PublishedContent;
using Umbraco.Cms.Core.Net;
using Umbraco.Cms.Core.PropertyEditors;
using Umbraco.Cms.Core.Routing;
using Umbraco.Cms.Core.Runtime;
using Umbraco.Cms.Core.Serialization;
using Umbraco.Cms.Core.Strings;
using Umbraco.Cms.Infrastructure.Mail;
using Umbraco.Cms.Infrastructure.Persistence;
using Umbraco.Cms.Infrastructure.Persistence.Mappers;
using Umbraco.Cms.Infrastructure.Persistence.SqlSyntax;
using Umbraco.Cms.Persistence.SqlServer.Services;
using Umbraco.Cms.Tests.Common;
using Umbraco.Cms.Tests.Common.Testing;
using Umbraco.Extensions;
using Constants = Umbraco.Cms.Core.Constants;
using File = System.IO.File;
using IHostingEnvironment = Umbraco.Cms.Core.Hosting.IHostingEnvironment;

namespace Umbraco.Cms.Tests.UnitTests.TestHelpers
{
    /// <summary>
    /// Common helper properties and methods useful to testing
    /// </summary>
    public static class TestHelper
    {
        private static readonly TestHelperInternal s_testHelperInternal = new TestHelperInternal();

        private class TestHelperInternal : TestHelperBase
        {
            public TestHelperInternal()
                : base(typeof(TestHelperInternal).Assembly)
            {
            }

            public override IBulkSqlInsertProvider BulkSqlInsertProvider { get; } = Mock.Of<IBulkSqlInsertProvider>();

            public override IMarchal Marchal { get; } = Mock.Of<IMarchal>();

            public override IHostingEnvironment GetHostingEnvironment()
            {
                var testPath = TestContext.CurrentContext.TestDirectory.Split("bin")[0];
                return new TestHostingEnvironment(
                    Mock.Of<IOptionsMonitor<HostingSettings>>(x => x.CurrentValue == new HostingSettings()),
                    Mock.Of<IOptionsMonitor<WebRoutingSettings>>(x => x.CurrentValue == new WebRoutingSettings()),
                    Mock.Of<IWebHostEnvironment>(
                        x =>
                            x.WebRootPath == "/" &&
                            x.ContentRootPath == testPath));
            }

            public override IApplicationShutdownRegistry GetHostingEnvironmentLifetime()
                => Mock.Of<IApplicationShutdownRegistry>();

            public override IIpResolver GetIpResolver()
                => Mock.Of<IIpResolver>();
        }

        public static ITypeFinder GetTypeFinder() => s_testHelperInternal.GetTypeFinder();

        public static TypeLoader GetMockedTypeLoader() => s_testHelperInternal.GetMockedTypeLoader();

        public static Lazy<ISqlContext> GetMockSqlContext()
        {
            ISqlContext sqlContext = Mock.Of<ISqlContext>();
            var syntax = new SqlServerSyntaxProvider(Options.Create(new GlobalSettings()));
            Mock.Get(sqlContext).Setup(x => x.SqlSyntax).Returns(syntax);
            return new Lazy<ISqlContext>(() => sqlContext);
        }

        public static MapperConfigurationStore CreateMaps()
            => new MapperConfigurationStore();

        /// <summary>
        /// Gets the working directory of the test project.
        /// </summary>
        /// <value>The assembly directory.</value>
        public static string WorkingDirectory => s_testHelperInternal.WorkingDirectory;

        public static IShortStringHelper ShortStringHelper => s_testHelperInternal.ShortStringHelper;

        public static IJsonSerializer JsonSerializer => s_testHelperInternal.JsonSerializer;

        public static IVariationContextAccessor VariationContextAccessor => s_testHelperInternal.VariationContextAccessor;

        public static IBulkSqlInsertProvider BulkSqlInsertProvider => s_testHelperInternal.BulkSqlInsertProvider;

        public static IMarchal Marchal => s_testHelperInternal.Marchal;

        public static CoreDebugSettings CoreDebugSettings => s_testHelperInternal.CoreDebugSettings;

        public static IIOHelper IOHelper => s_testHelperInternal.IOHelper;

        public static IMainDom MainDom => s_testHelperInternal.MainDom;

        public static UriUtility UriUtility => s_testHelperInternal.UriUtility;

        public static IEmailSender EmailSender { get; } = new EmailSender(new NullLogger<EmailSender>(), new TestOptionsMonitor<GlobalSettings>(new GlobalSettings()), Mock.Of<IEventAggregator>());

        /// <summary>
        /// Some test files are copied to the /bin (/bin/debug) on build, this is a utility to return their physical path based on a virtual path name
        /// </summary>
        public static string MapPathForTestFiles(string relativePath) => s_testHelperInternal.MapPathForTestFiles(relativePath);

        public static void InitializeContentDirectories() => CreateDirectories(new[] { Constants.SystemDirectories.MvcViews, new GlobalSettings().UmbracoMediaPhysicalRootPath, Constants.SystemDirectories.AppPlugins });

        public static void CleanContentDirectories() => CleanDirectories(new[] { Constants.SystemDirectories.MvcViews, new GlobalSettings().UmbracoMediaPhysicalRootPath });

        public static void CreateDirectories(string[] directories)
        {
            foreach (var directory in directories)
            {
                var directoryInfo = new DirectoryInfo(IOHelper.MapPath(directory));
                if (directoryInfo.Exists == false)
                {
                    Directory.CreateDirectory(IOHelper.MapPath(directory));
                }
            }
        }

        public static void CleanDirectories(string[] directories)
        {
            var preserves = new Dictionary<string, string[]>
            {
                { Constants.SystemDirectories.MvcViews, new[] { "dummy.txt" } }
            };

            foreach (var directory in directories)
            {
                var directoryInfo = new DirectoryInfo(IOHelper.MapPath(directory));
                var preserve = preserves.ContainsKey(directory) ? preserves[directory] : null;
                if (directoryInfo.Exists)
                {
                    foreach (FileInfo fileInfo in directoryInfo.GetFiles().Where(x => preserve == null || preserve.Contains(x.Name) == false))
                    {
                        fileInfo.Delete();
                    }
                }
            }
        }

        public static void CleanUmbracoSettingsConfig()
        {
            var currDir = new DirectoryInfo(WorkingDirectory);

            var umbracoSettingsFile = Path.Combine(currDir.Parent.Parent.FullName, "config", "umbracoSettings.config");
            if (File.Exists(umbracoSettingsFile))
            {
                File.Delete(umbracoSettingsFile);
            }
        }

        // TODO: Move to Assertions or AssertHelper
        // FIXME: obsolete the dateTimeFormat thing and replace with dateDelta
        public static void AssertPropertyValuesAreEqual(object actual, object expected, string dateTimeFormat = null, Func<IEnumerable, IEnumerable> sorter = null, string[] ignoreProperties = null)
        {
            const int dateDeltaMilliseconds = 500; // .5s

            PropertyInfo[] properties = expected.GetType().GetProperties();
            foreach (PropertyInfo property in properties)
            {
                // ignore properties that are attributed with EditorBrowsableState.Never
                EditorBrowsableAttribute att = property.GetCustomAttribute<EditorBrowsableAttribute>(false);
                if (att != null && att.State == EditorBrowsableState.Never)
                {
                    continue;
                }

                // ignore explicitely ignored properties
                if (ignoreProperties != null && ignoreProperties.Contains(property.Name))
                {
                    continue;
                }

                var actualValue = property.GetValue(actual, null);
                var expectedValue = property.GetValue(expected, null);

                AssertAreEqual(property, expectedValue, actualValue, sorter, dateDeltaMilliseconds);
            }
        }

        private static void AssertAreEqual(PropertyInfo property, object expected, object actual, Func<IEnumerable, IEnumerable> sorter = null, int dateDeltaMilliseconds = 0)
        {
            if (!(expected is string) && expected is IEnumerable enumerable)
            {
                // sort property collection by alias, not by property ids
                // on members, built-in properties don't have ids (always zero)
                if (expected is PropertyCollection)
                {
                    sorter = e => ((PropertyCollection)e).OrderBy(x => x.Alias);
                }

                // compare lists
                AssertListsAreEqual(property, (IEnumerable)actual, enumerable, sorter, dateDeltaMilliseconds);
            }
            else if (expected is DateTime expectedDateTime)
            {
                // compare date & time with delta
                var actualDateTime = (DateTime)actual;
                var delta = (actualDateTime - expectedDateTime).TotalMilliseconds;
                Assert.IsTrue(Math.Abs(delta) <= dateDeltaMilliseconds, "Property {0}.{1} does not match. Expected: {2} but was: {3}", property.DeclaringType.Name, property.Name, expected, actual);
            }
            else if (expected is Property expectedProperty)
            {
                // compare values
                var actualProperty = (Property)actual;
                IPropertyValue[] expectedPropertyValues = expectedProperty.Values.OrderBy(x => x.Culture).ThenBy(x => x.Segment).ToArray();
                IPropertyValue[] actualPropertyValues = actualProperty.Values.OrderBy(x => x.Culture).ThenBy(x => x.Segment).ToArray();
                if (expectedPropertyValues.Length != actualPropertyValues.Length)
                {
                    Assert.Fail($"{property.DeclaringType.Name}.{property.Name}: Expected {expectedPropertyValues.Length} but got {actualPropertyValues.Length}.");
                }

                for (var i = 0; i < expectedPropertyValues.Length; i++)
                {
                    Assert.AreEqual(expectedPropertyValues[i].EditedValue, actualPropertyValues[i].EditedValue, $"{property.DeclaringType.Name}.{property.Name}: Expected draft value \"{expectedPropertyValues[i].EditedValue}\" but got \"{actualPropertyValues[i].EditedValue}\".");
                    Assert.AreEqual(expectedPropertyValues[i].PublishedValue, actualPropertyValues[i].PublishedValue, $"{property.DeclaringType.Name}.{property.Name}: Expected published value \"{expectedPropertyValues[i].EditedValue}\" but got \"{actualPropertyValues[i].EditedValue}\".");
                }
            }
            else if (expected is IDataEditor expectedEditor)
            {
                Assert.IsInstanceOf<IDataEditor>(actual);
                var actualEditor = (IDataEditor)actual;
                Assert.AreEqual(expectedEditor.Alias,  actualEditor.Alias);

                // what else shall we test?
            }
            else
            {
                // directly compare values
                Assert.AreEqual(
                    expected,
                    actual,
                    "Property {0}.{1} does not match. Expected: {2} but was: {3}",
                    property.DeclaringType.Name,
                    property.Name,
                    expected?.ToString() ?? "<null>",
                    actual?.ToString() ?? "<null>");
            }
        }

        private static void AssertListsAreEqual(PropertyInfo property, IEnumerable expected, IEnumerable actual, Func<IEnumerable, IEnumerable> sorter = null, int dateDeltaMilliseconds = 0)
        {
            if (sorter == null)
            {
                // this is pretty hackerific but saves us some code to write
                sorter = enumerable =>
                {
                    // semi-generic way of ensuring any collection of IEntity are sorted by Ids for comparison
                    var entities = enumerable.OfType<IEntity>().ToList();
                    return entities.Count > 0 ? (IEnumerable)entities.OrderBy(x => x.Id) : entities;
                };
            }

            var expectedListEx = sorter(expected).Cast<object>().ToList();
            var actualListEx = sorter(actual).Cast<object>().ToList();

            if (actualListEx.Count != expectedListEx.Count)
            {
                Assert.Fail("Collection {0}.{1} does not match. Expected IEnumerable containing {2} elements but was IEnumerable containing {3} elements", property.PropertyType.Name, property.Name, expectedListEx.Count, actualListEx.Count);
            }

            for (var i = 0; i < actualListEx.Count; i++)
            {
                AssertAreEqual(property, expectedListEx[i], actualListEx[i], sorter, dateDeltaMilliseconds);
            }
        }

        public static IUmbracoVersion GetUmbracoVersion() => s_testHelperInternal.GetUmbracoVersion();

        public static IServiceCollection GetServiceCollection() => new ServiceCollection().AddLazySupport();

        public static IHostingEnvironment GetHostingEnvironment() => s_testHelperInternal.GetHostingEnvironment();

        public static ILoggingConfiguration GetLoggingConfiguration(IHostingEnvironment hostingEnv) => s_testHelperInternal.GetLoggingConfiguration(hostingEnv);

        public static IApplicationShutdownRegistry GetHostingEnvironmentLifetime() => s_testHelperInternal.GetHostingEnvironmentLifetime();

        public static IIpResolver GetIpResolver() => s_testHelperInternal.GetIpResolver();

        public static IRequestCache GetRequestCache() => s_testHelperInternal.GetRequestCache();

        public static IPublishedUrlProvider GetPublishedUrlProvider() => s_testHelperInternal.GetPublishedUrlProvider();
    }
}
