using System;
using System.Data.SqlClient;
using System.Linq;
using System.IO;
using System.Text;
using System.Collections.Generic;

namespace DataAccessLayer
{
    public static class SqlLogging
    {
        private static readonly string LogPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "SqlLogs");
        private static readonly object lockObj = new object();

        static SqlLogging()
        {
            if (!Directory.Exists(LogPath))
            {
                Directory.CreateDirectory(LogPath);
            }
        }

        private static string GetLogFileName()
        {
            return Path.Combine(LogPath, $"sql_log_{DateTime.Now:yyyyMMdd}.txt");
        }

        public static void LogStoredProcedure(string spName, Dictionary<string, object> parameters = null, long executionTimeMs = 0)
        {
            try
            {
                var logBuilder = new StringBuilder();
                logBuilder.AppendLine($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff}] STORED PROCEDURE");
                logBuilder.AppendLine($"Name: {spName}");

                if (parameters != null && parameters.Count > 0)
                {
                    logBuilder.AppendLine("Parameters:");
                    foreach (var param in parameters)
                    {
                        var value = param.Value == DBNull.Value ? "NULL" : param.Value?.ToString() ?? "NULL";
                        logBuilder.AppendLine($"\t@{param.Key}: {value}");
                    }
                }

                if (executionTimeMs > 0)
                {
                    logBuilder.AppendLine($"Execution Time: {executionTimeMs}ms");
                }

                logBuilder.AppendLine(new string('-', 80));

                lock (lockObj)
                {
                    File.AppendAllText(GetLogFileName(), logBuilder.ToString());
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"Error logging stored procedure: {ex.Message}");
            }
        }

        public static void LogCommand(SqlCommand command, long executionTimeMs = 0)
        {
            try
            {
                var logBuilder = new StringBuilder();
                logBuilder.AppendLine($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff}]");
                logBuilder.AppendLine($"Command Type: {command.CommandType}");
                
                if (command.CommandType == System.Data.CommandType.StoredProcedure)
                {
                    logBuilder.AppendLine($"Stored Procedure Name: {command.CommandText}");
                }
                else
                {
                    logBuilder.AppendLine($"Command Text: {command.CommandText}");
                }

                if (command.Parameters.Count > 0)
                {
                    logBuilder.AppendLine("Parameters:");
                    foreach (SqlParameter param in command.Parameters)
                    {
                        var value = param.Value == DBNull.Value ? "NULL" : param.Value?.ToString() ?? "NULL";
                        logBuilder.AppendLine($"\t{param.ParameterName} ({param.SqlDbType}): {value}");
                    }
                }

                if (executionTimeMs > 0)
                {
                    logBuilder.AppendLine($"Execution Time: {executionTimeMs}ms");
                }

                logBuilder.AppendLine(new string('-', 80));

                lock (lockObj)
                {
                    File.AppendAllText(GetLogFileName(), logBuilder.ToString());
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"Error logging SQL command: {ex.Message}");
            }
        }
    }

}