Initial commit to new repository

src/AxCopilot/Services/UsageRankingService.cs

@@ -0,0 +1,105 @@
+using System.IO;
+using System.Text.Json;
+
+namespace AxCopilot.Services;
+
+/// <summary>
+/// 런처 항목 실행 횟수를 추적하여 퍼지 검색 결과 정렬에 활용합니다.
+/// 저장 위치: %APPDATA%\AxCopilot\usage.json
+/// 형식: { "키": 횟수 } — 키는 IndexEntry.Path (파일/폴더/앱 경로)
+/// </summary>
+internal static class UsageRankingService
+{
+    private static readonly string _dataFile = Path.Combine(
+        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+        "AxCopilot", "usage.json");
+
+    private static Dictionary<string, int> _counts = new(StringComparer.OrdinalIgnoreCase);
+    private static bool _loaded = false;
+    private static readonly object _lock = new();
+
+    /// <summary>
+    /// 항목 실행 시 호출하여 카운트를 증가시킵니다.
+    /// </summary>
+    public static void RecordExecution(string key)
+    {
+        if (string.IsNullOrWhiteSpace(key)) return;
+        EnsureLoaded();
+        lock (_lock)
+        {
+            _counts.TryGetValue(key, out var current);
+            _counts[key] = current + 1;
+        }
+        _ = SaveAsync();
+    }
+
+    /// <summary>
+    /// 주어진 키의 실행 횟수를 반환합니다. 없으면 0.
+    /// </summary>
+    public static int GetScore(string key)
+    {
+        if (string.IsNullOrWhiteSpace(key)) return 0;
+        EnsureLoaded();
+        lock (_lock)
+        {
+            return _counts.TryGetValue(key, out var count) ? count : 0;
+        }
+    }
+
+    /// <summary>
+    /// 실행 횟수 기준으로 내림차순 정렬하는 컴파러를 반환합니다.
+    /// 동점이면 원래 순서 유지 (stable sort).
+    /// </summary>
+    public static IEnumerable<T> SortByUsage<T>(IEnumerable<T> items, Func<T, string?> keySelector)
+    {
+        EnsureLoaded();
+        return items
+            .Select((item, idx) => (item, idx, score: GetScore(keySelector(item) ?? "")))
+            .OrderByDescending(x => x.score)
+            .ThenBy(x => x.idx)
+            .Select(x => x.item);
+    }
+
+    // ─── 내부 ──────────────────────────────────────────────────────────────────
+
+    private static void EnsureLoaded()
+    {
+        if (_loaded) return;
+        lock (_lock)
+        {
+            if (_loaded) return;
+            try
+            {
+                if (File.Exists(_dataFile))
+                {
+                    var json = File.ReadAllText(_dataFile);
+                    var data = JsonSerializer.Deserialize<Dictionary<string, int>>(json);
+                    if (data != null)
+                        _counts = new Dictionary<string, int>(data, StringComparer.OrdinalIgnoreCase);
+                }
+            }
+            catch (Exception ex)
+            {
+                LogService.Warn($"usage.json 로드 실패: {ex.Message}");
+            }
+            _loaded = true;
+        }
+    }
+
+    private static async Task SaveAsync()
+    {
+        try
+        {
+            Dictionary<string, int> snapshot;
+            lock (_lock) { snapshot = new Dictionary<string, int>(_counts); }
+
+            Directory.CreateDirectory(Path.GetDirectoryName(_dataFile)!);
+            var json = JsonSerializer.Serialize(snapshot, new JsonSerializerOptions { WriteIndented = false });
+            await File.WriteAllTextAsync(_dataFile, json);
+        }
+        catch (Exception ex)
+        {
+            LogService.Warn($"usage.json 저장 실패: {ex.Message}");
+        }
+    }
+}