Mac: finish Moltbot rename (paths)

apps/macos/Sources/Moltbot/DiagnosticsFileLog.swift

@@ -0,0 +1,133 @@
+import Foundation
+
+actor DiagnosticsFileLog {
+    static let shared = DiagnosticsFileLog()
+
+    private let fileName = "diagnostics.jsonl"
+    private let maxBytes: Int64 = 5 * 1024 * 1024
+    private let maxBackups = 5
+
+    struct Record: Codable, Sendable {
+        let ts: String
+        let pid: Int32
+        let category: String
+        let event: String
+        let fields: [String: String]?
+    }
+
+    nonisolated static func isEnabled() -> Bool {
+        UserDefaults.standard.bool(forKey: debugFileLogEnabledKey)
+    }
+
+    nonisolated static func logDirectoryURL() -> URL {
+        let library = FileManager().urls(for: .libraryDirectory, in: .userDomainMask).first
+            ?? FileManager().homeDirectoryForCurrentUser.appendingPathComponent("Library", isDirectory: true)
+        return library
+            .appendingPathComponent("Logs", isDirectory: true)
+            .appendingPathComponent("Moltbot", isDirectory: true)
+    }
+
+    nonisolated static func logFileURL() -> URL {
+        self.logDirectoryURL().appendingPathComponent("diagnostics.jsonl", isDirectory: false)
+    }
+
+    nonisolated func log(category: String, event: String, fields: [String: String]? = nil) {
+        guard Self.isEnabled() else { return }
+        let record = Record(
+            ts: ISO8601DateFormatter().string(from: Date()),
+            pid: ProcessInfo.processInfo.processIdentifier,
+            category: category,
+            event: event,
+            fields: fields)
+        Task { await self.write(record: record) }
+    }
+
+    func clear() throws {
+        let fm = FileManager()
+        let base = Self.logFileURL()
+        if fm.fileExists(atPath: base.path) {
+            try fm.removeItem(at: base)
+        }
+        for idx in 1...self.maxBackups {
+            let url = self.rotatedURL(index: idx)
+            if fm.fileExists(atPath: url.path) {
+                try fm.removeItem(at: url)
+            }
+        }
+    }
+
+    private func write(record: Record) {
+        do {
+            try self.ensureDirectory()
+            try self.rotateIfNeeded()
+            try self.append(record: record)
+        } catch {
+            // Best-effort only: never crash or block the app on logging.
+        }
+    }
+
+    private func ensureDirectory() throws {
+        try FileManager().createDirectory(
+            at: Self.logDirectoryURL(),
+            withIntermediateDirectories: true)
+    }
+
+    private func append(record: Record) throws {
+        let url = Self.logFileURL()
+        let data = try JSONEncoder().encode(record)
+        var line = Data()
+        line.append(data)
+        line.append(0x0A) // newline
+
+        let fm = FileManager()
+        if !fm.fileExists(atPath: url.path) {
+            fm.createFile(atPath: url.path, contents: nil)
+        }
+
+        let handle = try FileHandle(forWritingTo: url)
+        defer { try? handle.close() }
+        try handle.seekToEnd()
+        try handle.write(contentsOf: line)
+    }
+
+    private func rotateIfNeeded() throws {
+        let url = Self.logFileURL()
+        guard let attrs = try? FileManager().attributesOfItem(atPath: url.path),
+              let size = attrs[.size] as? NSNumber
+        else { return }
+
+        if size.int64Value < self.maxBytes { return }
+
+        let fm = FileManager()
+
+        let oldest = self.rotatedURL(index: self.maxBackups)
+        if fm.fileExists(atPath: oldest.path) {
+            try fm.removeItem(at: oldest)
+        }
+
+        if self.maxBackups > 1 {
+            for idx in stride(from: self.maxBackups - 1, through: 1, by: -1) {
+                let src = self.rotatedURL(index: idx)
+                let dst = self.rotatedURL(index: idx + 1)
+                if fm.fileExists(atPath: src.path) {
+                    if fm.fileExists(atPath: dst.path) {
+                        try fm.removeItem(at: dst)
+                    }
+                    try fm.moveItem(at: src, to: dst)
+                }
+            }
+        }
+
+        let first = self.rotatedURL(index: 1)
+        if fm.fileExists(atPath: first.path) {
+            try fm.removeItem(at: first)
+        }
+        if fm.fileExists(atPath: url.path) {
+            try fm.moveItem(at: url, to: first)
+        }
+    }
+
+    private func rotatedURL(index: Int) -> URL {
+        Self.logDirectoryURL().appendingPathComponent("\(self.fileName).\(index)", isDirectory: false)
+    }
+}