Add new read-only interfaces for all remaining model types

osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs

@@ -34,7 +34,7 @@ protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beat
                 return new CatchDifficultyAttributes { Mods = mods, Skills = skills };
 
             // this is the same as osu!, so there's potential to share the implementation... maybe
-            double preempt = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
+            double preempt = IBeatmapDifficultyInfo.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
 
             return new CatchDifficultyAttributes
             {

osu.Game.Rulesets.Catch/Objects/CatchHitObject.cs

@@ -132,7 +132,7 @@ protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, B
         {
             base.ApplyDefaultsToSelf(controlPointInfo, difficulty);
 
-            TimePreempt = (float)BeatmapDifficulty.DifficultyRange(difficulty.ApproachRate, 1800, 1200, 450);
+            TimePreempt = (float)IBeatmapDifficultyInfo.DifficultyRange(difficulty.ApproachRate, 1800, 1200, 450);
 
             Scale = (1.0f - 0.7f * (difficulty.CircleSize - 5) / 5) / 2;
         }

osu.Game.Rulesets.Catch/UI/DrawableCatchRuleset.cs

@@ -27,7 +27,7 @@ public DrawableCatchRuleset(Ruleset ruleset, IBeatmap beatmap, IReadOnlyList<Mod
             : base(ruleset, beatmap, mods)
         {
             Direction.Value = ScrollingDirection.Down;
-            TimeRange.Value = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450);
+            TimeRange.Value = IBeatmapDifficultyInfo.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450);
         }
 
         protected override ReplayInputHandler CreateReplayInputHandler(Replay replay) => new CatchFramedReplayInputHandler(replay);

osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs

@@ -53,7 +53,7 @@ protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beat
 
             double starRating = basePerformance > 0.00001 ? Math.Cbrt(1.12) * 0.027 * (Math.Cbrt(100000 / Math.Pow(2, 1 / 1.1) * basePerformance) + 4) : 0;
 
-            double preempt = (int)BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
+            double preempt = (int)IBeatmapDifficultyInfo.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
 
             int maxCombo = beatmap.HitObjects.Count;
             // Add the ticks + tail of the slider. 1 is subtracted because the head circle would be counted twice (once for the slider itself in the line above)

osu.Game.Rulesets.Osu/Objects/OsuHitObject.cs

@@ -126,7 +126,7 @@ protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, B
         {
             base.ApplyDefaultsToSelf(controlPointInfo, difficulty);
 
-            TimePreempt = (float)BeatmapDifficulty.DifficultyRange(difficulty.ApproachRate, 1800, 1200, PREEMPT_MIN);
+            TimePreempt = (float)IBeatmapDifficultyInfo.DifficultyRange(difficulty.ApproachRate, 1800, 1200, PREEMPT_MIN);
 
             // Preempt time can go below 450ms. Normally, this is achieved via the DT mod which uniformly speeds up all animations game wide regardless of AR.
             // This uniform speedup is hard to match 1:1, however we can at least make AR>10 (via mods) feel good by extending the upper linear function above.

osu.Game.Rulesets.Osu/Objects/Spinner.cs

@@ -43,7 +43,7 @@ protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, B
 
             double secondsDuration = Duration / 1000;
 
-            double minimumRotationsPerSecond = stable_matching_fudge * BeatmapDifficulty.DifficultyRange(difficulty.OverallDifficulty, 3, 5, 7.5);
+            double minimumRotationsPerSecond = stable_matching_fudge * IBeatmapDifficultyInfo.DifficultyRange(difficulty.OverallDifficulty, 3, 5, 7.5);
 
             SpinsRequired = (int)(secondsDuration * minimumRotationsPerSecond);
             MaximumBonusSpins = (int)((maximum_rotations_per_second - minimumRotationsPerSecond) * secondsDuration);

osu.Game.Rulesets.Taiko/Beatmaps/TaikoBeatmapConverter.cs

@@ -117,7 +117,7 @@ protected override IEnumerable<TaikoHitObject> ConvertHitObject(HitObject obj, I
 
                 case IHasDuration endTimeData:
                 {
-                    double hitMultiplier = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty, 3, 5, 7.5) * swell_hit_multiplier;
+                    double hitMultiplier = IBeatmapDifficultyInfo.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty, 3, 5, 7.5) * swell_hit_multiplier;
 
                     yield return new Swell
                     {

osu.Game.Rulesets.Taiko/Scoring/TaikoHealthProcessor.cs

@@ -40,8 +40,8 @@ public override void ApplyBeatmap(IBeatmap beatmap)
         {
             base.ApplyBeatmap(beatmap);
 
-            hpMultiplier = 1 / (object_count_factor * Math.Max(1, beatmap.HitObjects.OfType<Hit>().Count()) * BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.DrainRate, 0.5, 0.75, 0.98));
-            hpMissMultiplier = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.DrainRate, 0.0018, 0.0075, 0.0120);
+            hpMultiplier = 1 / (object_count_factor * Math.Max(1, beatmap.HitObjects.OfType<Hit>().Count()) * IBeatmapDifficultyInfo.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.DrainRate, 0.5, 0.75, 0.98));
+            hpMissMultiplier = IBeatmapDifficultyInfo.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.DrainRate, 0.0018, 0.0075, 0.0120);
         }
 
         protected override double GetHealthIncreaseFor(JudgementResult result)

osu.Game.Tests/Localisation/BeatmapMetadataRomanisationTest.cs

@@ -19,7 +19,7 @@ public void TestRomanisation()
                 Title = "Romanised title",
                 TitleUnicode = "Unicode Title"
             };
-            var romanisableString = metadata.ToRomanisableString();
+            var romanisableString = metadata.GetDisplayTitleRomanisable();
 
             Assert.AreEqual(metadata.ToString(), romanisableString.Romanised);
             Assert.AreEqual($"{metadata.ArtistUnicode} - {metadata.TitleUnicode}", romanisableString.Original);
@@ -33,7 +33,7 @@ public void TestRomanisationNoUnicode()
                 Artist = "Romanised Artist",
                 Title = "Romanised title"
             };
-            var romanisableString = metadata.ToRomanisableString();
+            var romanisableString = metadata.GetDisplayTitleRomanisable();
 
             Assert.AreEqual(romanisableString.Romanised, romanisableString.Original);
         }

osu.Game.Tournament/Components/SongBar.cs

@@ -117,7 +117,7 @@ private void update()
             if ((mods & LegacyMods.DoubleTime) > 0)
             {
                 // temporary local calculation (taken from OsuDifficultyCalculator)
-                double preempt = (int)BeatmapDifficulty.DifficultyRange(ar, 1800, 1200, 450) / 1.5;
+                double preempt = (int)IBeatmapDifficultyInfo.DifficultyRange(ar, 1800, 1200, 450) / 1.5;
                 ar = (float)(preempt > 1200 ? (1800 - preempt) / 120 : (1200 - preempt) / 150 + 5);
 
                 bpm *= 1.5f;

osu.Game/Beatmaps/BeatmapDifficulty.cs

@@ -5,7 +5,7 @@
 
 namespace osu.Game.Beatmaps
 {
-    public class BeatmapDifficulty : IHasPrimaryKey
+    public class BeatmapDifficulty : IHasPrimaryKey, IBeatmapDifficultyInfo
     {
         /// <summary>
         /// The default value used for all difficulty settings except <see cref="SliderMultiplier"/> and <see cref="SliderTickRate"/>.
@@ -49,47 +49,5 @@ public void CopyTo(BeatmapDifficulty difficulty)
             difficulty.SliderMultiplier = SliderMultiplier;
             difficulty.SliderTickRate = SliderTickRate;
         }
-
-        /// <summary>
-        /// Maps a difficulty value [0, 10] to a two-piece linear range of values.
-        /// </summary>
-        /// <param name="difficulty">The difficulty value to be mapped.</param>
-        /// <param name="min">Minimum of the resulting range which will be achieved by a difficulty value of 0.</param>
-        /// <param name="mid">Midpoint of the resulting range which will be achieved by a difficulty value of 5.</param>
-        /// <param name="max">Maximum of the resulting range which will be achieved by a difficulty value of 10.</param>
-        /// <returns>Value to which the difficulty value maps in the specified range.</returns>
-        public static double DifficultyRange(double difficulty, double min, double mid, double max)
-        {
-            if (difficulty > 5)
-                return mid + (max - mid) * (difficulty - 5) / 5;
-            if (difficulty < 5)
-                return mid - (mid - min) * (5 - difficulty) / 5;
-
-            return mid;
-        }
-
-        /// <summary>
-        /// Maps a difficulty value [0, 10] to a two-piece linear range of values.
-        /// </summary>
-        /// <param name="difficulty">The difficulty value to be mapped.</param>
-        /// <param name="range">The values that define the two linear ranges.
-        /// <list type="table">
-        ///   <item>
-        ///     <term>od0</term>
-        ///     <description>Minimum of the resulting range which will be achieved by a difficulty value of 0.</description>
-        ///   </item>
-        ///   <item>
-        ///     <term>od5</term>
-        ///     <description>Midpoint of the resulting range which will be achieved by a difficulty value of 5.</description>
-        ///   </item>
-        ///   <item>
-        ///     <term>od10</term>
-        ///     <description>Maximum of the resulting range which will be achieved by a difficulty value of 10.</description>
-        ///   </item>
-        /// </list>
-        /// </param>
-        /// <returns>Value to which the difficulty value maps in the specified range.</returns>
-        public static double DifficultyRange(double difficulty, (double od0, double od5, double od10) range)
-            => DifficultyRange(difficulty, range.od0, range.od5, range.od10);
     }
 }

osu.Game/Beatmaps/BeatmapInfo.cs

@@ -7,7 +7,6 @@
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Linq;
 using Newtonsoft.Json;
-using osu.Framework.Localisation;
 using osu.Framework.Testing;
 using osu.Game.Database;
 using osu.Game.Rulesets;
@@ -17,7 +16,7 @@ namespace osu.Game.Beatmaps
 {
     [ExcludeFromDynamicCompile]
     [Serializable]
-    public class BeatmapInfo : IEquatable<BeatmapInfo>, IHasPrimaryKey
+    public class BeatmapInfo : IEquatable<BeatmapInfo>, IHasPrimaryKey, IBeatmapInfo
     {
         public int ID { get; set; }
 
@@ -152,18 +151,7 @@ public string StoredBookmarks
         [JsonIgnore]
         public DifficultyRating DifficultyRating => BeatmapDifficultyCache.GetDifficultyRating(StarDifficulty);
 
-        public string[] SearchableTerms => new[]
-        {
-            Version
-        }.Concat(Metadata?.SearchableTerms ?? Enumerable.Empty<string>()).Where(s => !string.IsNullOrEmpty(s)).ToArray();
-
-        public override string ToString() => $"{Metadata ?? BeatmapSet?.Metadata} {versionString}".Trim();
-
-        public RomanisableString ToRomanisableString()
-        {
-            var metadata = (Metadata ?? BeatmapSet?.Metadata)?.ToRomanisableString() ?? new RomanisableString(null, null);
-            return new RomanisableString($"{metadata.GetPreferred(true)} {versionString}".Trim(), $"{metadata.GetPreferred(false)} {versionString}".Trim());
-        }
+        public override string ToString() => this.GetDisplayTitle();
 
         public bool Equals(BeatmapInfo other)
         {
@@ -187,5 +175,22 @@ public bool BackgroundEquals(BeatmapInfo other) => other != null && BeatmapSet !
         /// Returns a shallow-clone of this <see cref="BeatmapInfo"/>.
         /// </summary>
         public BeatmapInfo Clone() => (BeatmapInfo)MemberwiseClone();
+
+        #region Implementation of IHasOnlineID
+
+        public int? OnlineID => OnlineBeatmapID;
+
+        #endregion
+
+        #region Implementation of IBeatmapInfo
+
+        string IBeatmapInfo.DifficultyName => Version;
+        IBeatmapMetadataInfo IBeatmapInfo.Metadata => Metadata;
+        IBeatmapDifficultyInfo IBeatmapInfo.Difficulty => BaseDifficulty;
+        IBeatmapSetInfo IBeatmapInfo.BeatmapSet => BeatmapSet;
+        IRulesetInfo IBeatmapInfo.Ruleset => Ruleset;
+        double IBeatmapInfo.StarRating => StarDifficulty;
+
+        #endregion
     }
 }

osu.Game/Beatmaps/BeatmapInfoExtensions.cs

@@ -0,0 +1,38 @@
+// Copyright (c) ppy Pty Ltd <[email protected]>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using osu.Framework.Localisation;
+
+namespace osu.Game.Beatmaps
+{
+    public static class BeatmapInfoExtensions
+    {
+        /// <summary>
+        /// A user-presentable display title representing this beatmap.
+        /// </summary>
+        public static string GetDisplayTitle(this IBeatmapInfo beatmapInfo) => $"{getClosestMetadata(beatmapInfo)} {getVersionString(beatmapInfo)}".Trim();
+
+        /// <summary>
+        /// A user-presentable display title representing this beatmap, with localisation handling for potentially romanisable fields.
+        /// </summary>
+        public static RomanisableString GetDisplayTitleRomanisable(this IBeatmapInfo beatmapInfo)
+        {
+            var metadata = getClosestMetadata(beatmapInfo).GetDisplayTitleRomanisable();
+            var versionString = getVersionString(beatmapInfo);
+
+            return new RomanisableString($"{metadata.GetPreferred(true)} {versionString}".Trim(), $"{metadata.GetPreferred(false)} {versionString}".Trim());
+        }
+
+        public static string[] GetSearchableTerms(this IBeatmapInfo beatmapInfo) => new[]
+        {
+            beatmapInfo.DifficultyName
+        }.Concat(getClosestMetadata(beatmapInfo).GetSearchableTerms()).Where(s => !string.IsNullOrEmpty(s)).ToArray();
+
+        private static string getVersionString(IBeatmapInfo beatmapInfo) => string.IsNullOrEmpty(beatmapInfo.DifficultyName) ? string.Empty : $"[{beatmapInfo.DifficultyName}]";
+
+        // temporary helper methods until we figure which metadata should be where.
+        private static IBeatmapMetadataInfo getClosestMetadata(IBeatmapInfo beatmapInfo) =>
+            beatmapInfo.Metadata ?? beatmapInfo.BeatmapSet?.Metadata ?? new BeatmapMetadata();
+    }
+}

osu.Game/Beatmaps/BeatmapMetadata.cs

@@ -4,9 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations.Schema;
-using System.Linq;
 using Newtonsoft.Json;
-using osu.Framework.Localisation;
 using osu.Framework.Testing;
 using osu.Game.Database;
 using osu.Game.Users;
@@ -15,7 +13,7 @@ namespace osu.Game.Beatmaps
 {
     [ExcludeFromDynamicCompile]
     [Serializable]
-    public class BeatmapMetadata : IEquatable<BeatmapMetadata>, IHasPrimaryKey
+    public class BeatmapMetadata : IEquatable<BeatmapMetadata>, IHasPrimaryKey, IBeatmapMetadataInfo
     {
         public int ID { get; set; }
 
@@ -83,50 +81,13 @@ public string AuthorString
         public int PreviewTime { get; set; }
 
         public string AudioFile { get; set; }
-        public string BackgroundFile { get; set; }
 
-        public override string ToString()
-        {
-            string author = Author == null ? string.Empty : $"({Author})";
-            return $"{Artist} - {Title} {author}".Trim();
-        }
+        public string BackgroundFile { get; set; }
 
-        public RomanisableString ToRomanisableString()
-        {
-            string author = Author == null ? string.Empty : $"({Author})";
-            var artistUnicode = string.IsNullOrEmpty(ArtistUnicode) ? Artist : ArtistUnicode;
-            var titleUnicode = string.IsNullOrEmpty(TitleUnicode) ? Title : TitleUnicode;
+        public bool Equals(BeatmapMetadata other) => ((IBeatmapMetadataInfo)this).Equals(other);
 
-            return new RomanisableString($"{artistUnicode} - {titleUnicode} {author}".Trim(), $"{Artist} - {Title} {author}".Trim());
-        }
+        public override string ToString() => this.GetDisplayTitle();
 
-        [JsonIgnore]
-        public string[] SearchableTerms => new[]
-        {
-            Author?.Username,
-            Artist,
-            ArtistUnicode,
-            Title,
-            TitleUnicode,
-            Source,
-            Tags
-        }.Where(s => !string.IsNullOrEmpty(s)).ToArray();
-
-        public bool Equals(BeatmapMetadata other)
-        {
-            if (other == null)
-                return false;
-
-            return Title == other.Title
-                   && TitleUnicode == other.TitleUnicode
-                   && Artist == other.Artist
-                   && ArtistUnicode == other.ArtistUnicode
-                   && AuthorString == other.AuthorString
-                   && Source == other.Source
-                   && Tags == other.Tags
-                   && PreviewTime == other.PreviewTime
-                   && AudioFile == other.AudioFile
-                   && BackgroundFile == other.BackgroundFile;
-        }
+        string IBeatmapMetadataInfo.Author => AuthorString;
     }
 }

osu.Game/Beatmaps/BeatmapMetadataInfoExtensions.cs

@@ -0,0 +1,46 @@
+// Copyright (c) ppy Pty Ltd <[email protected]>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using osu.Framework.Localisation;
+
+namespace osu.Game.Beatmaps
+{
+    public static class BeatmapMetadataInfoExtensions
+    {
+        /// <summary>
+        /// An array of all searchable terms provided in contained metadata.
+        /// </summary>
+        public static string[] GetSearchableTerms(this IBeatmapMetadataInfo metadataInfo) => new[]
+        {
+            metadataInfo.Author,
+            metadataInfo.Artist,
+            metadataInfo.ArtistUnicode,
+            metadataInfo.Title,
+            metadataInfo.TitleUnicode,
+            metadataInfo.Source,
+            metadataInfo.Tags
+        }.Where(s => !string.IsNullOrEmpty(s)).ToArray();
+
+        /// <summary>
+        /// A user-presentable display title representing this metadata.
+        /// </summary>
+        public static string GetDisplayTitle(this IBeatmapMetadataInfo metadataInfo)
+        {
+            string author = string.IsNullOrEmpty(metadataInfo.Author) ? string.Empty : $"({metadataInfo.Author})";
+            return $"{metadataInfo.Artist} - {metadataInfo.Title} {author}".Trim();
+        }
+
+        /// <summary>
+        /// A user-presentable display title representing this beatmap, with localisation handling for potentially romanisable fields.
+        /// </summary>
+        public static RomanisableString GetDisplayTitleRomanisable(this IBeatmapMetadataInfo metadataInfo)
+        {
+            string author = string.IsNullOrEmpty(metadataInfo.Author) ? string.Empty : $"({metadataInfo.Author})";
+            var artistUnicode = string.IsNullOrEmpty(metadataInfo.ArtistUnicode) ? metadataInfo.Artist : metadataInfo.ArtistUnicode;
+            var titleUnicode = string.IsNullOrEmpty(metadataInfo.TitleUnicode) ? metadataInfo.Title : metadataInfo.TitleUnicode;
+
+            return new RomanisableString($"{artistUnicode} - {titleUnicode} {author}".Trim(), $"{metadataInfo.Artist} - {metadataInfo.Title} {author}".Trim());
+        }
+    }
+}

osu.Game/Beatmaps/BeatmapSetFileInfo.cs

@@ -7,7 +7,7 @@
 
 namespace osu.Game.Beatmaps
 {
-    public class BeatmapSetFileInfo : INamedFileInfo, IHasPrimaryKey
+    public class BeatmapSetFileInfo : INamedFileInfo, IHasPrimaryKey, INamedFileUsage
     {
         public int ID { get; set; }
 
@@ -19,5 +19,7 @@ public class BeatmapSetFileInfo : INamedFileInfo, IHasPrimaryKey
 
         [Required]
         public string Filename { get; set; }
+
+        public IFileInfo File => FileInfo;
     }
 }