using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Runtime.CompilerServices;

using UnityEngine;

namespace XericLibrary.Runtime.MacroLibrary
{
	public static partial class MacroMath
	{
		#region 名称文本

		/// <summary>
		/// 获取此处的物体名称，如果带有（clone）后缀，则省略这个后缀
		/// </summary>
		[MethodImpl(MethodImplOptions.NoInlining)]
		public static string GetGameObjectNameWithoutClone(GameObject gameObject)
		{
			return GetGameObjectNameWithoutClone(gameObject.name);
		}

		/// <summary>
		/// 获取此处的物体名称，如果带有（clone）后缀，则省略这个后缀
		/// </summary>
		[MethodImpl(MethodImplOptions.NoInlining)]
		public static string GetGameObjectNameWithoutClone(string gameObjectName)
		{
			const string cloneSuffix = "(Clone)";
			if(gameObjectName.EndsWith(cloneSuffix))
			{
				int suffixIndex = gameObjectName.LastIndexOf(cloneSuffix);
				string nameWithoutClone = gameObjectName.Substring(0, suffixIndex);
				return nameWithoutClone;
			}
			return gameObjectName;
		}

		#endregion

		#region 转文本

		/// <summary>
		/// 将一个数值四舍五入后转为一个文本，并保留特定的小数点位，如果这个小数位为0则省略不写
		/// </summary>
		/// <param name="value"></param>
		/// <param name="decimals">目标小数位</param>
		/// <returns></returns>
		public static string RoundToString(this double value, int decimals)
		{
			if(value == 0)
				return "0";
			return Math.Round(value, decimals).ToString();
		}

		public static string RoundToString(this float value, int decimals)
		{
			return ((double)value).RoundToString(decimals);
		}

		#endregion

		#region 区域与语言

#if false
		/// <summary>
		/// 将一个数值转为中文小写格式
		/// </summary>
		/// <param name="number"></param>
		/// <returns></returns>
		public static string NumberToChinese_Format(int number)
		{
			CultureInfo cultureInfo = new CultureInfo("zh-CN");

			// 使用文化信息中的数字格式来将数字转换为中文
			return string.Format(cultureInfo, "{0:R}", number);
			// 遗憾的是会报R无效
		}
#endif

		private static readonly string[] chineseNumber = new string[] 
			{"零","一","二","三","四","五","六","七","八","九"};
		private static readonly string[] chineseDigit = new string[] 
			{ "","十","百","千","万","十","百","千","亿","十","百","千","亿"};

		private static readonly string[] chineseNumber_ComplexFont = new string[] 
			{"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};
		private static readonly string[] chineseDigit_ComplexFont = new string[] 
			{ "","拾","佰","仟","万","拾","佰","仟","亿","拾","佰","仟","亿"};

		/// <summary>
		/// 将一个数值转为中文小写格式;
		/// </summary>
		/// <param name="number"></param>
		/// <returns></returns>
		private static string NumberToChinese(int number, out bool needFillZero, int digit = 0)
		{
			needFillZero = false;

			// 取消输出最高位的零
			if(number == 0)
				return "";

			// 高位拼接一个当前位
			if(number > 0)
			{
				int digitNumber = number % 10;
				var result = NumberToChinese(number / 10, out var fillZero, digit + 1);

				// 此处为零，后续可能需要填充一个零
				needFillZero = digitNumber == 0;

				// 如果此处为零，则等待低位处理填充
				var proclitic = 
					needFillZero ? "" : (fillZero ? chineseNumber[0] : "") + chineseNumber[digitNumber] + chineseDigit[digit] ;
				return result + proclitic;
			}
			
			// 输出最高位
			return chineseNumber[number] + chineseDigit[digit];
		}

		/// <summary>
		/// 将一个数值转为中文小写格式，并确保读写格式满足日常使用；
		/// 比如 510会读成五百一十，9009会读成九千零九，
		/// 最大支持到九千亿，理论上并不是它的极限，只要继续套格式即可。
		/// </summary>
		/// <param name="number"></param>
		/// <returns></returns>
		public static string NumberToChinese(int number)
		{
			string guide = "";
			// 如果为零直接输出，因为单个0没法读
			if(number == 0)
				return chineseNumber[0];
			// 如果为负就在前面加上负
			if(number < 0)
				guide = "负";

			string result;
			// 特殊处理
			switch(number)
			{
				case 10:
				result = "十";
				break;
				case 11:
				result = "十一";
				break;
				case 12:
				result = "十二";
				break;
				case 13:
				result = "十三";
				break;
				case 14:
				result = "十四";
				break;
				case 15:
				result = "十五";
				break;
				case 16:
				result = "十六";
				break;
				case 17:
				result = "十七";
				break;
				case 18:
				result = "十八";
				break;
				case 19:
				result = "十九";
				break;
				default:
				result = NumberToChinese(Mathf.Abs(number), out var zero);
				break;
			}
			// 合并格式化
			return guide + result;
		}

		#endregion
	}
}