using System;
using System.Collections.Generic;

using UnityEngine;

namespace NoSuchStudio.Common {
    /// <summary>
    /// Base class for MonoBehaviours that should have a separate logger. Useful for filtering
    /// logs by class types.
    /// </summary>
    /// <remarks>
    /// This class keeps track of all types that inherit it and creates a <see cref="UnityEngine.Logger"/>
    /// for each. 
    /// Any messages logged through the helper methods will have the class name prepended to the message.
    /// <code>
    /// // will print "[MyClass] Hello World!"
    /// MonoBehaviourWithLogger.LogLog&lt;MyClass&gt;("Hello World!"); 
    /// </code>
    /// Using sample code like below, you can filter your logs by class.
    /// <code>
    /// MonoBehaviourWithLogger.GetLoggerByType&lt;SubclassOfMonoBehaviourWithLogger&gt;().Item1.filterLogType = LogType.Error;
    /// </code>
    /// </remarks>
    public abstract class MonoBehaviourWithLogger : MonoBehaviour {
        public static readonly Dictionary<Type, (Logger, string)> loggers = new Dictionary<Type, (Logger, string)>();
        public Logger logger {
            get {
                Type thisType = GetType();
                return GetLoggerByType(thisType).logger;
            }
        }
        public string logTag {
            get {
                Type thisType = GetType();
                return GetLoggerByType(thisType).logTag;
            }
        }
        protected void LogLog(string format, params object[] args) {
            logger.LogFormat(LogType.Log, string.Format("{0} {1}", logTag, format), args);
        }
        protected void LogWarn(string format, params object[] args) {
            logger.LogFormat(LogType.Warning, string.Format("{0} {1}", logTag, format), args);
        }
        protected void LogError(string format, params object[] args) {
            logger.LogFormat(LogType.Error, string.Format("{0} {1}", logTag, format), args);
        }

        private static void AddType(Type type) {
            if (!loggers.ContainsKey(type)) {
                loggers.Add(type, (new Logger(Debug.unityLogger.logHandler), string.Format("[{0}]", type.Name)));
            }
        }

        public static (Logger logger, string logTag) GetLoggerByType(Type type) {
            AddType(type);
            return loggers[type];
        }

        public static (Logger logger, string logTag) GetLoggerByType<T>() {
            return GetLoggerByType(typeof(T));
        }

        protected static void LogLog<T>(string format, params object[] args) {
            (Logger logger, string LogTag) = GetLoggerByType<T>();
            logger.LogFormat(LogType.Log, string.Format("{0} {1}", LogTag, format), args);
        }

        protected static void LogWarn<T>(string format, params object[] args) {
            (Logger logger, string LogTag) = GetLoggerByType<T>();
            logger.LogFormat(LogType.Warning, string.Format("{0} {1}", LogTag, format), args);
        }

        protected static void LogError<T>(string format, params object[] args) {
            (Logger logger, string LogTag) = GetLoggerByType<T>();
            logger.LogFormat(LogType.Error, string.Format("{0} {1}", LogTag, format), args);
        }
    }
}