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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Threading;
namespace QtVsTools.Core.Common
{
using Options;
public abstract class SettingsBase<T>
{
public TV GetValue<TV>(Expression<Func<TV>> propertyByRef)
{
var property = GetPropertyInfo(propertyByRef);
if (!TryGetAttributeKey(property, out (string Key, object) tuple))
return default;
if (!Settings.TryGetValue(tuple.Key, out var value))
return default;
if (Equals<TV, bool>() && value is int number)
return (TV)(object)(number == 1);
if (Equals<TV, QtOptionsPage.Timeout>() && value is int timeout)
return (TV)(object)(QtOptionsPage.Timeout)timeout;
if (typeof(TV).IsEnum && value is string enumerator)
return (TV)Enum.Parse(typeof(TV), enumerator);
return value is TV defaultValue ? defaultValue : default;
}
public void SetValue<TV>(Expression<Func<TV>> propertyByRef, object value)
{
var property = GetPropertyInfo(propertyByRef);
if (TryGetAttributeKey(property, out (string Key, object) tuple))
Settings[tuple.Key] = value;
}
public abstract void SaveSettings();
protected abstract Dictionary<string, object> LoadSettings();
protected void Initialize()
{
Settings = new ConcurrentDictionary<string, object>(LoadSettings());
InitializedEvent.Set();
}
protected static bool TryGetAttributeKey(MemberInfo property, out (string, object) tuple)
{
tuple = (null, null);
if (Attribute.IsDefined(property, typeof(SettingsAttribute))) {
var attributes = property.GetCustomAttributes(typeof(SettingsAttribute), false)
.OfType<SettingsAttribute>().ToList();
if (attributes.FirstOrDefault() is { } attribute)
tuple = (attribute.Key, attribute.DefaultValue);
}
return !string.IsNullOrEmpty(tuple.Item1);
}
protected readonly ManualResetEventSlim InitializedEvent = new(false);
protected ConcurrentDictionary<string, object> Settings { get; private set; }
private static bool Equals<T1, T2>()
{
return typeof(T1) == typeof(T2);
}
private static PropertyInfo GetPropertyInfo<TV>(Expression<Func<TV>> propertyByRef)
{
if (propertyByRef.Body is not MemberExpression memberExpression)
throw new ArgumentException("Expression must be a member access expression.");
if (memberExpression.Member is not PropertyInfo property)
throw new ArgumentException("Expression must be a property access expression.");
var declaringType = property.DeclaringType;
if (declaringType == null || !typeof(T).IsAssignableFrom(declaringType))
throw new ArgumentException($"Property must be declared in a subclass of {nameof(T)}.");
return property;
}
}
}
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