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osu-lazer/osu.Game/Rulesets/Mods/Mod.cs
2023-05-08 18:12:56 +09:00

275 lines
11 KiB
C#

// 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.Linq;
using System.Reflection;
using Newtonsoft.Json;
using osu.Framework.Bindables;
using osu.Framework.Extensions.TypeExtensions;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Localisation;
using osu.Game.Configuration;
using osu.Game.Extensions;
using osu.Game.Rulesets.UI;
using osu.Game.Utils;
namespace osu.Game.Rulesets.Mods
{
/// <summary>
/// The base class for gameplay modifiers.
/// </summary>
public abstract class Mod : IMod, IEquatable<Mod>, IDeepCloneable<Mod>
{
[JsonIgnore]
public abstract string Name { get; }
public abstract string Acronym { get; }
[JsonIgnore]
public virtual IconUsage? Icon => null;
[JsonIgnore]
public virtual ModType Type => ModType.Fun;
[JsonIgnore]
public abstract LocalisableString Description { get; }
/// <summary>
/// The tooltip to display for this mod when used in a <see cref="ModIcon"/>.
/// </summary>
/// <remarks>
/// Differs from <see cref="Name"/>, as the value of attributes (AR, CS, etc) changeable via the mod
/// are displayed in the tooltip.
/// </remarks>
[JsonIgnore]
public string IconTooltip
{
get
{
string description = SettingDescription;
return string.IsNullOrEmpty(description) ? Name : $"{Name} ({description})";
}
}
/// <summary>
/// The description of editable settings of a mod to use in the <see cref="IconTooltip"/>.
/// </summary>
/// <remarks>
/// Parentheses are added to the tooltip, surrounding the value of this property. If this property is <c>string.Empty</c>,
/// the tooltip will not have parentheses.
/// </remarks>
public virtual string SettingDescription
{
get
{
var tooltipTexts = new List<string>();
foreach ((SettingSourceAttribute attr, PropertyInfo property) in this.GetOrderedSettingsSourceProperties())
{
var bindable = (IBindable)property.GetValue(this)!;
if (!bindable.IsDefault)
tooltipTexts.Add($"{attr.Label} {bindable}");
}
return string.Join(", ", tooltipTexts.Where(s => !string.IsNullOrEmpty(s)));
}
}
/// <summary>
/// The score multiplier of this mod.
/// </summary>
[JsonIgnore]
public abstract double ScoreMultiplier { get; }
/// <summary>
/// Returns true if this mod is implemented (and playable).
/// </summary>
[JsonIgnore]
public virtual bool HasImplementation => this is IApplicableMod;
[JsonIgnore]
public virtual bool UserPlayable => true;
[JsonIgnore]
public virtual bool ValidForMultiplayer => true;
[JsonIgnore]
public virtual bool ValidForMultiplayerAsFreeMod => true;
/// <summary>
/// Whether this mod requires configuration to apply changes to the game.
/// </summary>
[JsonIgnore]
public virtual bool RequiresConfiguration => false;
/// <summary>
/// The mods this mod cannot be enabled with.
/// </summary>
[JsonIgnore]
public virtual Type[] IncompatibleMods => Array.Empty<Type>();
private IReadOnlyDictionary<string, IBindable>? settingsBacking;
/// <summary>
/// All <see cref="IBindable"/> settings within this mod.
/// </summary>
/// <remarks>
/// The settings are returned in ascending key order as per <see cref="SettingsMap"/>.
/// The ordering is intentionally enforced manually, as ordering of <see cref="Dictionary{TKey,TValue}.Values"/> is unspecified.
/// </remarks>
internal IEnumerable<IBindable> SettingsBindables => SettingsMap.OrderBy(pair => pair.Key).Select(pair => pair.Value);
/// <summary>
/// Provides mapping of names to <see cref="IBindable"/>s of all settings within this mod.
/// </summary>
internal IReadOnlyDictionary<string, IBindable> SettingsMap =>
settingsBacking ??= this.GetSettingsSourceProperties()
.Select(p => p.Item2)
.ToDictionary(property => property.Name.ToSnakeCase(), property => (IBindable)property.GetValue(this)!);
/// <summary>
/// Whether all settings in this mod are set to their default state.
/// </summary>
protected virtual bool UsesDefaultConfiguration => SettingsBindables.All(s => s.IsDefault);
/// <summary>
/// Creates a copy of this <see cref="Mod"/> initialised to a default state.
/// </summary>
public virtual Mod DeepClone()
{
var result = (Mod)Activator.CreateInstance(GetType())!;
result.CopyFrom(this);
return result;
}
/// <summary>
/// Copies mod setting values from <paramref name="source"/> into this instance, overwriting all existing settings.
/// </summary>
/// <param name="source">The mod to copy properties from.</param>
public void CopyFrom(Mod source)
{
if (source.GetType() != GetType())
throw new ArgumentException($"Expected mod of type {GetType()}, got {source.GetType()}.", nameof(source));
foreach (var (_, property) in this.GetSettingsSourceProperties())
{
var targetBindable = (IBindable)property.GetValue(this)!;
var sourceBindable = (IBindable)property.GetValue(source)!;
CopyAdjustedSetting(targetBindable, sourceBindable);
}
}
/// <summary>
/// This method copies the values of all settings from <paramref name="source"/> that share the same names with this mod instance.
/// The most frequent use of this is when switching rulesets, in order to preserve values of common settings during the switch.
/// </summary>
/// <remarks>
/// The values are copied directly, without adjusting for possibly different allowed ranges of values.
/// If the value of a setting is not valid for this instance due to not falling inside of the allowed range, it will be clamped accordingly.
/// </remarks>
/// <param name="source">The mod to extract settings from.</param>
public void CopyCommonSettingsFrom(Mod source)
{
if (source.UsesDefaultConfiguration)
return;
foreach (var (name, targetSetting) in SettingsMap)
{
if (!source.SettingsMap.TryGetValue(name, out IBindable? sourceSetting))
continue;
if (sourceSetting.IsDefault)
continue;
var targetBindableType = targetSetting.GetType();
var sourceBindableType = sourceSetting.GetType();
// if either the target is assignable to the source or the source is assignable to the target,
// then we presume that the data types contained in both bindables are compatible and we can proceed with the copy.
// this handles cases like `Bindable<int>` and `BindableInt`.
if (!targetBindableType.IsAssignableFrom(sourceBindableType) && !sourceBindableType.IsAssignableFrom(targetBindableType))
continue;
// TODO: special case for handling number types
PropertyInfo property = targetSetting.GetType().GetProperty(nameof(Bindable<bool>.Value))!;
property.SetValue(targetSetting, property.GetValue(sourceSetting));
}
}
/// <summary>
/// When creating copies or clones of a Mod, this method will be called
/// to copy explicitly adjusted user settings from <paramref name="target"/>.
/// The base implementation will transfer the value via <see cref="Bindable{T}.Parse"/>
/// or by binding and unbinding (if <paramref name="source"/> is an <see cref="IBindable"/>)
/// and should be called unless replaced with custom logic.
/// </summary>
/// <param name="target">The target bindable to apply the adjustment to.</param>
/// <param name="source">The adjustment to apply.</param>
internal virtual void CopyAdjustedSetting(IBindable target, object source)
{
if (source is IBindable sourceBindable)
{
// copy including transfer of default values.
target.BindTo(sourceBindable);
target.UnbindFrom(sourceBindable);
}
else
{
if (!(target is IParseable parseable))
throw new InvalidOperationException($"Bindable type {target.GetType().ReadableName()} is not {nameof(IParseable)}.");
parseable.Parse(source);
}
}
public bool Equals(IMod? other) => other is Mod them && Equals(them);
public bool Equals(Mod? other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return GetType() == other.GetType() &&
SettingsBindables.SequenceEqual(other.SettingsBindables, ModSettingsEqualityComparer.Default);
}
public override int GetHashCode()
{
var hashCode = new HashCode();
hashCode.Add(GetType());
foreach (var setting in SettingsBindables)
hashCode.Add(setting.GetUnderlyingSettingValue());
return hashCode.ToHashCode();
}
/// <summary>
/// Reset all custom settings for this mod back to their defaults.
/// </summary>
public virtual void ResetSettingsToDefaults() => CopyFrom((Mod)Activator.CreateInstance(GetType())!);
private class ModSettingsEqualityComparer : IEqualityComparer<IBindable>
{
public static ModSettingsEqualityComparer Default { get; } = new ModSettingsEqualityComparer();
public bool Equals(IBindable? x, IBindable? y)
{
object? xValue = x?.GetUnderlyingSettingValue();
object? yValue = y?.GetUnderlyingSettingValue();
return EqualityComparer<object>.Default.Equals(xValue, yValue);
}
public int GetHashCode(IBindable obj) => obj.GetUnderlyingSettingValue().GetHashCode();
}
}
}