osu-lazer/osu.Game/Tests/Beatmaps/BeatmapConversionTest.cs

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using Newtonsoft.Json;
using NUnit.Framework;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Game.Beatmaps;
using osu.Game.Beatmaps.Formats;
using osu.Game.Rulesets;
using osu.Game.Rulesets.Objects;

namespace osu.Game.Tests.Beatmaps
{
    [TestFixture]
    public abstract class BeatmapConversionTest<TConvertMapping, TConvertValue>
        where TConvertMapping : ConvertMapping<TConvertValue>, IEquatable<TConvertMapping>, new()
        where TConvertValue : IEquatable<TConvertValue>
    {
        private const string resource_namespace = "Testing.Beatmaps";
        private const string expected_conversion_suffix = "-expected-conversion";

        protected abstract string ResourceAssembly { get; }

        protected IBeatmapConverter Converter { get; private set; }

        protected void Test(string name)
        {
            var ourResult = convert(name);
            var expectedResult = read(name);

            Assert.Multiple(() =>
            {
                int mappingCounter = 0;

                while (true)
                {
                    if (mappingCounter >= ourResult.Mappings.Count && mappingCounter >= expectedResult.Mappings.Count)
                        break;

                    if (mappingCounter >= ourResult.Mappings.Count)
                        Assert.Fail($"A conversion did not generate any hitobjects, but should have, for hitobject at time: {expectedResult.Mappings[mappingCounter].StartTime}\n");
                    else if (mappingCounter >= expectedResult.Mappings.Count)
                        Assert.Fail($"A conversion generated hitobjects, but should not have, for hitobject at time: {ourResult.Mappings[mappingCounter].StartTime}\n");
                    else if (!expectedResult.Mappings[mappingCounter].Equals(ourResult.Mappings[mappingCounter]))
                    {
                        var expectedMapping = expectedResult.Mappings[mappingCounter];
                        var ourMapping = ourResult.Mappings[mappingCounter];

                        Assert.Fail($"The conversion mapping differed for object at time {expectedMapping.StartTime}:\n"
                                    + $"Expected {JsonConvert.SerializeObject(expectedMapping)}\n"
                                    + $"Received: {JsonConvert.SerializeObject(ourMapping)}\n");
                    }
                    else
                    {
                        var ourMapping = ourResult.Mappings[mappingCounter];
                        var expectedMapping = expectedResult.Mappings[mappingCounter];

                        Assert.Multiple(() =>
                        {
                            int objectCounter = 0;

                            while (true)
                            {
                                if (objectCounter >= ourMapping.Objects.Count && objectCounter >= expectedMapping.Objects.Count)
                                    break;

                                if (objectCounter >= ourMapping.Objects.Count)
                                    Assert.Fail($"The conversion did not generate a hitobject, but should have, for hitobject at time: {expectedMapping.StartTime}:\n"
                                                + $"Expected: {JsonConvert.SerializeObject(expectedMapping.Objects[objectCounter])}\n");
                                else if (objectCounter >= expectedMapping.Objects.Count)
                                    Assert.Fail($"The conversion generated a hitobject, but should not have, for hitobject at time: {ourMapping.StartTime}:\n"
                                                + $"Received: {JsonConvert.SerializeObject(ourMapping.Objects[objectCounter])}\n");
                                else if (!expectedMapping.Objects[objectCounter].Equals(ourMapping.Objects[objectCounter]))
                                {
                                    Assert.Fail($"The conversion generated differing hitobjects for object at time: {expectedMapping.StartTime}:\n"
                                                + $"Expected: {JsonConvert.SerializeObject(expectedMapping.Objects[objectCounter])}\n"
                                                + $"Received: {JsonConvert.SerializeObject(ourMapping.Objects[objectCounter])}\n");
                                }

                                objectCounter++;
                            }
                        });
                    }

                    mappingCounter++;
                }
            });
        }

        private ConvertResult convert(string name)
        {
            var beatmap = getBeatmap(name);

            var rulesetInstance = CreateRuleset();
            beatmap.BeatmapInfo.Ruleset = beatmap.BeatmapInfo.RulesetID == rulesetInstance.RulesetInfo.ID ? rulesetInstance.RulesetInfo : new RulesetInfo();

            Converter = rulesetInstance.CreateBeatmapConverter(beatmap);

            var result = new ConvertResult();

            Converter.ObjectConverted += (orig, converted) =>
            {
                converted.ForEach(h => h.ApplyDefaults(beatmap.ControlPointInfo, beatmap.BeatmapInfo.BaseDifficulty));

                var mapping = CreateConvertMapping();
                mapping.StartTime = orig.StartTime;

                foreach (var obj in converted)
                    mapping.Objects.AddRange(CreateConvertValue(obj));
                result.Mappings.Add(mapping);
            };

            IBeatmap convertedBeatmap = Converter.Convert();
            rulesetInstance.CreateBeatmapProcessor(convertedBeatmap)?.PostProcess();

            return result;
        }

        private ConvertResult read(string name)
        {
            using (var resStream = openResource($"{resource_namespace}.{name}{expected_conversion_suffix}.json"))
            using (var reader = new StreamReader(resStream))
            {
                var contents = reader.ReadToEnd();
                return JsonConvert.DeserializeObject<ConvertResult>(contents);
            }
        }

        private IBeatmap getBeatmap(string name)
        {
            using (var resStream = openResource($"{resource_namespace}.{name}.osu"))
            using (var stream = new StreamReader(resStream))
            {
                var decoder = Decoder.GetDecoder<Beatmap>(stream);
                ((LegacyBeatmapDecoder)decoder).ApplyOffsets = false;
                return decoder.Decode(stream);
            }
        }

        private Stream openResource(string name)
        {
            var localPath = Path.GetDirectoryName(Uri.UnescapeDataString(new UriBuilder(Assembly.GetExecutingAssembly().CodeBase).Path));
            return Assembly.LoadFrom(Path.Combine(localPath, $"{ResourceAssembly}.dll")).GetManifestResourceStream($@"{ResourceAssembly}.Resources.{name}");
        }

        /// <summary>
        /// Creates the conversion mapping for a <see cref="HitObject"/>. A conversion mapping stores important information about the conversion process.
        /// This is generated _after_ the <see cref="HitObject"/> has been converted.
        /// <para>
        /// This should be used to validate the integrity of the conversion process after a conversion has occurred.
        /// </para>
        /// </summary>
        protected virtual TConvertMapping CreateConvertMapping() => new TConvertMapping();

        /// <summary>
        /// Creates the conversion value for a <see cref="HitObject"/>. A conversion value stores information about the converted <see cref="HitObject"/>.
        /// <para>
        /// This should be used to validate the integrity of the converted <see cref="HitObject"/>.
        /// </para>
        /// </summary>
        /// <param name="hitObject">The converted <see cref="HitObject"/>.</param>
        protected abstract IEnumerable<TConvertValue> CreateConvertValue(HitObject hitObject);

        /// <summary>
        /// Creates the <see cref="Ruleset"/> applicable to this <see cref="BeatmapConversionTest{TConvertMapping,TConvertValue}"/>.
        /// </summary>
        /// <returns></returns>
        protected abstract Ruleset CreateRuleset();

        private class ConvertResult
        {
            [JsonProperty]
            public List<TConvertMapping> Mappings = new List<TConvertMapping>();
        }
    }

    public abstract class BeatmapConversionTest<TConvertValue> : BeatmapConversionTest<ConvertMapping<TConvertValue>, TConvertValue>
        where TConvertValue : IEquatable<TConvertValue>
    {
    }

    public class ConvertMapping<TConvertValue> : IEquatable<ConvertMapping<TConvertValue>>
        where TConvertValue : IEquatable<TConvertValue>
    {
        [JsonProperty]
        public double StartTime;

        [JsonIgnore]
        public List<TConvertValue> Objects = new List<TConvertValue>();

        [JsonProperty("Objects")]
        private List<TConvertValue> setObjects
        {
            set => Objects = value;
        }

        public virtual bool Equals(ConvertMapping<TConvertValue> other) => StartTime.Equals(other?.StartTime);
    }
}