mirror of
https://github.com/wwiinnddyy/LanMountainDesktop.git
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setting_re3
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lincube
@@ -1,251 +1,19 @@
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text.Json;
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using LanMountainDesktop.Models;
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using LanMountainDesktop.Services.Settings;
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namespace LanMountainDesktop.Services;
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public sealed class DesktopLayoutSettingsService
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{
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private static readonly JsonSerializerOptions SerializerOptions = new()
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{
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WriteIndented = true
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};
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private static readonly object CacheGate = new();
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private static readonly TimeSpan CacheProbeInterval = TimeSpan.FromMilliseconds(400);
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private static string? _cachedPath;
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private static DesktopLayoutSettingsSnapshot? _cachedSnapshot;
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private static DateTime _cachedWriteTimeUtc = DateTime.MinValue;
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private static DateTime _lastProbeUtc = DateTime.MinValue;
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private readonly string _settingsPath;
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private readonly string _legacyAppSettingsPath;
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public DesktopLayoutSettingsService()
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{
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var appData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
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var settingsDirectory = Path.Combine(appData, "LanMountainDesktop");
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_settingsPath = Path.Combine(settingsDirectory, "desktop-layout-settings.json");
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_legacyAppSettingsPath = Path.Combine(settingsDirectory, "settings.json");
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}
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private readonly IComponentLayoutStore _layoutStore = ComponentDomainStorageProvider.Instance;
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public DesktopLayoutSettingsSnapshot Load()
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{
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try
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{
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lock (CacheGate)
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{
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var nowUtc = DateTime.UtcNow;
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if (TryGetCachedWithoutProbe(nowUtc, out var cached))
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{
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return cached;
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}
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var hasFile = File.Exists(_settingsPath);
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var writeTimeUtc = hasFile
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? File.GetLastWriteTimeUtc(_settingsPath)
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: DateTime.MinValue;
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_lastProbeUtc = nowUtc;
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if (TryGetCachedAfterProbe(writeTimeUtc, out cached))
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{
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return cached;
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}
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DesktopLayoutSettingsSnapshot loadedSnapshot;
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var loadedFromLegacy = false;
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if (hasFile)
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{
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loadedSnapshot = LoadSnapshotFromDisk();
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}
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else if (TryLoadLegacySnapshot(out var migratedSnapshot))
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{
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loadedSnapshot = migratedSnapshot;
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loadedFromLegacy = true;
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}
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else
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{
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loadedSnapshot = new DesktopLayoutSettingsSnapshot();
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}
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var normalizedSnapshot = NormalizeSnapshot(loadedSnapshot);
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if (loadedFromLegacy)
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{
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writeTimeUtc = PersistSnapshotToDisk(normalizedSnapshot);
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}
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UpdateCache(normalizedSnapshot, writeTimeUtc, nowUtc);
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return normalizedSnapshot.Clone();
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}
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}
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catch (Exception ex)
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{
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AppLogger.Warn("DesktopLayout", $"Failed to load desktop layout settings from '{_settingsPath}'.", ex);
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return new DesktopLayoutSettingsSnapshot();
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}
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return _layoutStore.LoadLayout();
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}
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public void Save(DesktopLayoutSettingsSnapshot snapshot)
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{
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var snapshotToPersist = NormalizeSnapshot(snapshot);
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try
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{
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var writeTimeUtc = PersistSnapshotToDisk(snapshotToPersist);
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lock (CacheGate)
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{
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UpdateCache(snapshotToPersist, writeTimeUtc, DateTime.UtcNow);
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}
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}
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catch (Exception ex)
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{
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AppLogger.Warn("DesktopLayout", $"Failed to save desktop layout settings to '{_settingsPath}'.", ex);
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}
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}
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private bool TryGetCachedWithoutProbe(DateTime nowUtc, out DesktopLayoutSettingsSnapshot snapshot)
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{
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if (string.Equals(_cachedPath, _settingsPath, StringComparison.Ordinal) &&
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_cachedSnapshot is not null &&
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nowUtc - _lastProbeUtc < CacheProbeInterval)
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{
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snapshot = _cachedSnapshot.Clone();
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return true;
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}
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snapshot = null!;
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return false;
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}
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private bool TryGetCachedAfterProbe(DateTime writeTimeUtc, out DesktopLayoutSettingsSnapshot snapshot)
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{
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if (string.Equals(_cachedPath, _settingsPath, StringComparison.Ordinal) &&
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_cachedSnapshot is not null &&
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writeTimeUtc == _cachedWriteTimeUtc)
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{
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snapshot = _cachedSnapshot.Clone();
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return true;
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}
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snapshot = null!;
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return false;
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}
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private DesktopLayoutSettingsSnapshot LoadSnapshotFromDisk()
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{
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try
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{
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var json = File.ReadAllText(_settingsPath);
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var snapshot = JsonSerializer.Deserialize<DesktopLayoutSettingsSnapshot>(json, SerializerOptions);
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return NormalizeSnapshot(snapshot);
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}
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catch (Exception ex)
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{
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AppLogger.Warn("DesktopLayout", $"Failed to deserialize desktop layout settings from '{_settingsPath}'.", ex);
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return new DesktopLayoutSettingsSnapshot();
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}
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}
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private bool TryLoadLegacySnapshot(out DesktopLayoutSettingsSnapshot snapshot)
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{
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snapshot = new DesktopLayoutSettingsSnapshot();
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try
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{
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if (!File.Exists(_legacyAppSettingsPath))
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{
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return false;
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}
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var legacyJson = File.ReadAllText(_legacyAppSettingsPath);
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var legacy = JsonSerializer.Deserialize<LegacyDesktopLayoutSettingsSnapshot>(legacyJson, SerializerOptions);
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if (legacy is null)
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{
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return false;
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}
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snapshot = new DesktopLayoutSettingsSnapshot
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{
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DesktopPageCount = legacy.DesktopPageCount,
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CurrentDesktopSurfaceIndex = legacy.CurrentDesktopSurfaceIndex,
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DesktopComponentPlacements = legacy.DesktopComponentPlacements ?? []
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};
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return true;
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}
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catch (Exception ex)
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{
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AppLogger.Warn("DesktopLayout", $"Failed to migrate legacy desktop layout settings from '{_legacyAppSettingsPath}'.", ex);
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return false;
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}
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}
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private DateTime PersistSnapshotToDisk(DesktopLayoutSettingsSnapshot snapshot)
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{
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var directory = Path.GetDirectoryName(_settingsPath);
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if (!string.IsNullOrWhiteSpace(directory))
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{
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Directory.CreateDirectory(directory);
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}
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var json = JsonSerializer.Serialize(snapshot, SerializerOptions);
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File.WriteAllText(_settingsPath, json);
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return File.Exists(_settingsPath)
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? File.GetLastWriteTimeUtc(_settingsPath)
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: DateTime.UtcNow;
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}
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private static DesktopLayoutSettingsSnapshot NormalizeSnapshot(DesktopLayoutSettingsSnapshot? snapshot)
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{
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var normalized = snapshot?.Clone() ?? new DesktopLayoutSettingsSnapshot();
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normalized.DesktopPageCount = Math.Max(1, normalized.DesktopPageCount);
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normalized.CurrentDesktopSurfaceIndex = Math.Max(0, normalized.CurrentDesktopSurfaceIndex);
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var placements = new List<DesktopComponentPlacementSnapshot>(normalized.DesktopComponentPlacements?.Count ?? 0);
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if (normalized.DesktopComponentPlacements is not null)
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{
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foreach (var placement in normalized.DesktopComponentPlacements)
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{
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if (placement is null)
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{
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continue;
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}
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placements.Add(new DesktopComponentPlacementSnapshot
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{
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PlacementId = placement.PlacementId?.Trim() ?? string.Empty,
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PageIndex = Math.Max(0, placement.PageIndex),
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ComponentId = placement.ComponentId?.Trim() ?? string.Empty,
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Row = Math.Max(0, placement.Row),
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Column = Math.Max(0, placement.Column),
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WidthCells = Math.Max(1, placement.WidthCells),
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HeightCells = Math.Max(1, placement.HeightCells)
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});
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}
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}
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normalized.DesktopComponentPlacements = placements;
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return normalized;
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}
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private void UpdateCache(DesktopLayoutSettingsSnapshot snapshot, DateTime writeTimeUtc, DateTime probeTimeUtc)
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{
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_cachedPath = _settingsPath;
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_cachedSnapshot = snapshot.Clone();
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_cachedWriteTimeUtc = writeTimeUtc;
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_lastProbeUtc = probeTimeUtc;
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}
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private sealed class LegacyDesktopLayoutSettingsSnapshot
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{
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public int DesktopPageCount { get; set; } = 1;
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public int CurrentDesktopSurfaceIndex { get; set; }
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public List<DesktopComponentPlacementSnapshot>? DesktopComponentPlacements { get; set; }
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_layoutStore.SaveLayout(snapshot ?? new DesktopLayoutSettingsSnapshot());
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}
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}
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