InGameConsole

using System.Collections.Generic;
using UnityEngine;

public class InGameConsole : MonoBehaviour {

    private class Log {
        public Log(string log, string sender, LogType type) {
            this.log = log;
            this.sender = sender;
            this.type = type;
        }

        public string log;
        public string sender;
        public LogType type;
    }

    private static List<Log> logs;
    private static Vector2 scroll;
    private static InGameConsole instance;
    private static Log selected;
    private static bool open;

    [RuntimeInitializeOnLoadMethod]
    private static void Init() {
        logs = new List<Log>();

        instance = new GameObject("Console").AddComponent<InGameConsole>();
        DontDestroyOnLoad(instance.gameObject);
        open = false;

        Application.logMessageReceivedThreaded += (log, sender, type) => {
            logs.Add(new Log(log, sender, type));
            scroll.y = 4096f;
            open = true;
        };
    }

    //private void Update() {
    //    if(Input.GetKeyDown(KeyCode.Escape)) {
    //        Debug.Log("Simple LOG");
    //        Debug.LogWarning("Simple Warning LOG");
    //        Debug.LogError("Simple Error LOG");
    //    }

    //    if(Input.GetKeyDown(KeyCode.A))
    //        Debug.Log("Simple LOG");
    //    if(Input.GetKeyDown(KeyCode.S))
    //        Debug.LogWarning("Simple Warning LOG");
    //    if(Input.GetKeyDown(KeyCode.D))
    //        Debug.LogError("Simple Error LOG");
    //}

    private void OnGUI() {
        if(!open)
            return;

        var windowStyle = new GUIStyle(GUI.skin.window);
        var boxStyle = new GUIStyle(GUI.skin.box);

        boxStyle.alignment = TextAnchor.UpperLeft;
        boxStyle.wordWrap = true;

        GUILayout.BeginArea(new Rect(0f, 0f, Screen.width * 0.5f, Screen.height * 0.5f), "Console", windowStyle);
        scroll = GUILayout.BeginScrollView(scroll, false, false, GUILayout.ExpandHeight(true));


        foreach(var log in logs)
            if(log != null) {
                var color = string.Empty;

                switch(log.type) {
                    case LogType.Assert:
                    case LogType.Error:
                    case LogType.Exception:
                        color = "red";
                        break;
                    case LogType.Warning:
                        color = "orange";
                        break;
                }

                if(selected == log)
                    GUILayout.Box(string.Format("<color={0}>{1}: {2}</color>\n\n{3}", color, log.type, log.log, log.sender), boxStyle);
                else if(GUILayout.Button(string.Format("<color={0}>{1}: {2}</color>", color, log.type, log.log), boxStyle))
                    selected = log;
            }

        GUILayout.EndScrollView();
        GUILayout.FlexibleSpace();
        GUILayout.BeginHorizontal();
        if(GUILayout.Button("Clear"))
            logs.Clear();
        if(GUILayout.Button("Close"))
            open = false;
        GUILayout.EndHorizontal();
        GUILayout.EndArea();
    }
}