LeCountdown/LeCountdown/Utils/FileLogger.swift

//
//  FileLogger.swift
//  LeCountdown
//
//  Created by Laurent Morvillier on 10/04/2023.
//

import Foundation

struct Log: Identifiable, Codable {
    
    var id: String = UUID().uuidString
    
    var date: Date
    var file: String
    var line: Int
    var function: String
    var message: String
    
    var content: String {
        return "\(file).\(line).\(function): \(message)"
    }
    
}

class FileLogger {
    
    fileprivate let fileName = "logs.json"
    
    static var main: FileLogger = FileLogger()
    
    var logs: [Log]
    
    var timer: Timer? = nil
    
    init() {
        self.logs = []

        do {
            let content = try FileUtils.readDocumentFile(fileName: self.fileName)
            if let logs: [Log] = try content.decodeArray() {
                self.logs = logs
            } else {
                Logger.w("Log decoding failed")
            }
        } catch {
            Logger.error(error)
        }
        
    }
    
    func addLog(_ log: Log) {
        self.logs.append(log)
        self._scheduleWrite()
    }
    
    fileprivate func _scheduleWrite() {
        self.timer?.invalidate()
        self.timer = Timer.scheduledTimer(withTimeInterval: 5.0, repeats: false, block: { _ in
            self._writeLogs()
        })
    }
    
    fileprivate func _writeLogs() {
        DispatchQueue(label: "app.enchant.write", qos: .utility).async {
            if let json = self.logs.jsonString {
                do {
                    let _ = try FileUtils.writeToDocumentDirectory(content: json, fileName: self.fileName)
                } catch {
                    Logger.error(error)
                }
            }
        }
    }
    
    @objc static public func log(_ message: String, file: String = #file, function: String = #function, line: Int = #line) {
        let filestr = NSString(string: file)
        let log = Log(date: Date(), file: filestr.lastPathComponent, line: line, function: function, message: message)
        FileLogger.main.addLog(log)
    }
    
}