using log4net.Util;

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using UnityEngine;

using static Codice.CM.WorkspaceServer.WorkspaceTreeDataStore;

namespace XericLibrary.Runtime.MacroLibrary
{
	/// <summary>
	/// Merged debug messages
	/// </summary>
	/// <remarks>
	/// 合并调试消息，
	/// 如果需要输出连续的一串消息，但又因为太长或太细碎导致调试信息破碎，
	/// 就适合使用合并消息。
	/// </remarks>
	public class MergeDebug
    {
		#region 字段属性

		/// <summary>
		/// 单次发送消息的限制长度
		/// </summary>
		private const int debugInfomationLengthLimit = 4000;

		/// <summary>
		/// 消息内容
		/// </summary>
		private StringBuilder messageContext;

		#endregion

		#region 构造函数

		public MergeDebug() 
		{
			messageContext = new StringBuilder();
		}

		#endregion

		#region 输入消息

		/// <summary>
		/// Push the message content
		/// </summary>
		/// <remarks>
		/// 压入消息内容
		/// </remarks>
		public void PushLog(string message)
		{
			messageContext.Append(message);
		}

		/// <summary>
		/// Push the message content, with a line feed
		/// </summary>
		/// <remarks>
		/// 压入消息内容，并在末尾追加一个换行符
		/// </remarks>
		public void PushLogLine(string message)
		{
			messageContext.AppendLine(message);
		}

		#endregion

		#region 输出消息

		private static bool IsNewLine(char c)
		{
			return c == '\n' || c == '\r';
		}

		private static void PopLog(StringBuilder sb, Action<string> debugFunc) 
		{
			//debugInfomationLengthLimit
			var context = sb.ToString();

			int startIndex = 0;
			int endIndex = 0;

			while(startIndex < context.Length)
			{
				endIndex = Math.Min(startIndex + debugInfomationLengthLimit, context.Length);

				while(endIndex > startIndex && !IsNewLine(context[endIndex - 1]))
				{
					endIndex--;
				}

				string line = context.Substring(startIndex, endIndex - startIndex);
				debugFunc(line);

				startIndex = endIndex;
				while(startIndex < context.Length && IsNewLine(context[startIndex]))
				{
					startIndex++;
				}
			}

		}

		/// <summary>
		/// Send information in a message type
		/// </summary>
		/// <remarks>
		/// 以消息类型发送信息
		/// </remarks>
		public void Log()
		{
			PopLog(messageContext, a => Debug.Log(a));
			messageContext.Clear();
		}

		/// <summary>
		/// Send information in a Warning type
		/// </summary>
		/// <remarks>
		/// 以警告类型发送信息
		/// </remarks>
		public void LogWarning()
		{
			PopLog(messageContext, a => Debug.LogWarning(a));
			messageContext.Clear();
		}

		/// <summary>
		/// Send information in a Error type
		/// </summary>
		/// <remarks>
		/// 以错误消息类型发送信息
		/// </remarks> 
		public void LogError()
		{
			PopLog(messageContext, a => Debug.LogError(a));
			messageContext.Clear();
		}

		#endregion
    }
}