// SPDX-FileCopyrightText: 2025 The Project Pterodactyl Developers
//
// SPDX-License-Identifier: MPL-2.0

import Foundation
import Logging

struct FileLogHandler: LogHandler {
	private let label: String
	private let fileHandle: FileHandle
	var logLevel: Logger.Level = .info
	var metadata: Logger.Metadata = [:]

	init(label: String, fileURL: URL) {
		self.label = label

		// Ensure file exists
		if !FileManager.default.fileExists(atPath: fileURL.path) {
			FileManager.default.createFile(atPath: fileURL.path, contents: nil)
		}

		// Open file for updating (read/write)
		self.fileHandle = try! FileHandle(forUpdating: fileURL)
		self.fileHandle.seekToEndOfFile()
	}

	subscript(metadataKey key: String) -> Logger.Metadata.Value? {
		get { metadata[key] }
		set { metadata[key] = newValue }
	}

	func log(
		level: Logger.Level,
		message: Logger.Message,
		metadata: Logger.Metadata?,
		source: String,
		file: String,
		function: String,
		line: UInt
	) {
		var fullMetadata = self.metadata
		metadata?.forEach { fullMetadata[$0] = $1 }

		let line = "[\(level)] \(message)\n"
		if let data = line.data(using: .utf8) {
			fileHandle.write(data)
		}
	}
}

extension Logger {
	static let shared: Self = {
		let logFile = URL(fileURLWithPath: "/tmp/pterodactyl-language-server.log")

		LoggingSystem.bootstrap { label in
			FileLogHandler(label: label, fileURL: logFile)
		}

		var logger = Logger(label: "org.pterodactyl.language-server")
		logger.logLevel = .debug
		return logger
	}()
}