leak_test/leak_test_project/Utils/FileLogger.cs

using System;
using System.IO;
using System.Text;
using leak_test_project.Models;

namespace leak_test_project.Utils
{
    /// <summary>
    /// 통신 로그 및 시스템 이력을 파일로 저장하는 유틸리티
    /// </summary>
    public static class FileLogger
    {
        private static readonly string LogDirectory = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Logs");
        private static readonly object _lock = new object();

        /// <summary>
        /// 검사 데이터를 Logs/yyyy-MM-dd.csv 파일에 저장함
        /// </summary>
        public static void LogInspectData(InspectData data)
        {
            lock (_lock)
            {
                try
                {
                    if (!Directory.Exists(LogDirectory))
                        Directory.CreateDirectory(LogDirectory);

                    string dateStr = DateTime.Now.ToString("yyyy-MM-dd");
                    string filePath = Path.Combine(LogDirectory, $"{dateStr}.csv");

                    bool isNewFile = !File.Exists(filePath);

                    // CSV 헤더: Date,Time,Channel,ID,Value,Judgment,Mode,LineNo,ProductType,SpecUL,SpecLL,Retest
                    if (isNewFile)
                    {
                        string header = "Date,Time,Channel,ID,Value,Judgment,Mode,LineNo,ProductType,SpecUL,SpecLL,Retest" + Environment.NewLine;
                        File.WriteAllText(filePath, header, Encoding.UTF8);
                    }

                    string csvLine = $"{Esc(data.InspectDate)},{Esc(data.InspectTime)},{Esc(data.Channel)},{Esc(data.ProductId)}," +
                                     $"{Esc(data.MeasuredValue)},{Esc(data.Judgment)},{Esc(data.Mode)},{Esc(data.LineNo)}," +
                                     $"{Esc(data.ProductType)},{Esc(data.SpecUL)},{Esc(data.SpecLL)},{Esc(data.Retest)}{Environment.NewLine}";

                    File.AppendAllText(filePath, csvLine, Encoding.UTF8);
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"[FileLogger Error] {ex.Message}");
                }
            }
        }

        /// <summary>
        /// 단순 텍스트 로그 (기존 호환성 유지용)
        /// </summary>
        public static void Log(string tag, string message)
        {
            lock (_lock)
            {
                try
                {
                    if (!Directory.Exists(LogDirectory))
                        Directory.CreateDirectory(LogDirectory);

                    string dateStr = DateTime.Now.ToString("yyyy-MM-dd");
                    string filePath = Path.Combine(LogDirectory, $"{dateStr}_system.log");

                    string logEntry = $"[{DateTime.Now:HH:mm:ss.fff}] [{tag}] {message}{Environment.NewLine}";
                    File.AppendAllText(filePath, logEntry, Encoding.UTF8);
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"[FileLogger Error] {ex.Message}");
                }
            }
        }
        /// <summary>
        /// CSV 값 이스케이프: 쉼표, 따옴표, 줄바꿈이 포함된 값을 안전하게 감싸줌
        /// </summary>
        private static string Esc(string value)
        {
            if (string.IsNullOrEmpty(value)) return "";
            if (value.Contains(",") || value.Contains("\"") || value.Contains("\n"))
                return $"\"{value.Replace("\"", "\"\"")}\"";
            return value;
        }
    }
}