/*===============================================================================
Copyright (C) 2024 Immersal - Part of Hexagon. All Rights Reserved.

This file is part of the Immersal SDK.

The Immersal SDK cannot be copied, distributed, or made available to
third-parties for commercial purposes without written permission of Immersal Ltd.

Contact sales@immersal.com for licensing requests.
===============================================================================*/

using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using UnityEngine;

namespace Immersal
{
    public class ImmersalLogger : MonoBehaviour
    {
        public enum LoggingLevel
        {
            All = 0,
            Verbose = 1,
            ErrorsAndWarnings = 2,
            ErrorsOnly = 3,
            None = 4
        }
        
        public static LoggingLevel Level = LoggingLevel.All;

        private const bool m_IncludeCallerName = true;
        private const string m_AdditionalPrefix = "";

        // Include calling class name in logging messages
        private static string ProcessMessage(string message, string filePath = "")
        {
            if (m_IncludeCallerName)
            {
                string callerName;
                
                // check if filePath is provided (by System.Runtime.CompilerServices)
                if (!string.IsNullOrEmpty(filePath))
                {
                    callerName = System.IO.Path.GetFileNameWithoutExtension(filePath);
                }
                else
                {
                    // fall back to fetching calling class name from stack with reflection
                    // note: will give unexpected results when call originates in an async Task
                
                    callerName = new StackFrame(2, false).GetMethod().DeclaringType?.Name
                                 ?? "Unknown";
                }
                
                message = $"[{callerName}] {message}";
            }

            return $"{m_AdditionalPrefix}{message}";
        }
        
        // note: filePath parameter is automagically included by System.Runtime.CompilerServices.CallerFilePath
        
        public static void Log(string message, LoggingLevel messageLevel = LoggingLevel.All, [CallerFilePath] string filePath = "")
        {
            if (Level > messageLevel) return;
            UnityEngine.Debug.Log(ProcessMessage(message, filePath));
        }

        public static void LogWarning(string message,  [CallerFilePath] string filePath = "")
        {
            if (Level > LoggingLevel.ErrorsAndWarnings) return;
            UnityEngine.Debug.LogWarning(ProcessMessage(message, filePath));
        }

        public static void LogError(string message, [CallerFilePath] string filePath = "")
        {
            if (Level > LoggingLevel.ErrorsOnly) return;
            UnityEngine.Debug.LogError(ProcessMessage(message, filePath));
        }
    }
}