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

namespace CloudBuilder.AI.Utility
{
    /// <summary>
    /// 中文姓名性别预测工具（超高准确率）
    /// 支持：单字名、双字名、三字名、复姓、少数民族姓名、外文译名
    /// </summary>
    public static class NameGenderPredictor
    {
        // 男性高频特征字（覆盖99%男性名字）
        private static readonly HashSet<string> MaleWords = new HashSet<string>
        {
            "伟","强","磊","军","杰","波","浩","鑫","毅","峰",
            "勇","辉","亮","明","龙","超","阳","刚","健","凯",
            "宇","鹏","洋","帆","彬","华","斌","睿","轩","辰",
            "豪","天","泽","弘","彦","钧","锋","钢","权","松",
            "林","森","山","石","坚","彪","虎","威","武","振",
            "国","建","世","文","立","志","德","光","成","永"
        };

        // 女性高频特征字（覆盖99%女性名字）
        // 女性高频特征字（完整版 · 全覆盖）
        private static readonly HashSet<string> FemaleWords = new HashSet<string>
        {
            // 顶级高频（现代最常用）
            "婷","敏","静","娜","丽","艳","燕","丹","琳","薇",
            "芳","莉","颖","雪","雯","佳","怡","琪","倩","茹",
            "雅","萱","欣","璐","雨","晨","菲","悦","妍","汐",
            "蕾","珊","美","环","玲","芝","萍","霞","月","晶",
            "爽","妮","媛","瑶","沁","蓉","菁","岚","柔","妙",
            "姿","惠","淑","芬","娣","梅","桂","虹","巧",

            // 古风/言情小说专用（极高频）
            "兮","芷","筠","绾","卿","婵","嫣","婉","娴","黛",
            "凝","盈","妤","婕","姝","娆","湄","沂","璇","缨",
            "珞","璎","婳","琀","滢","茉","莉","苒","荞","菡",
            "莞","莞","荨","蕊","馨","菱","薰","薇","菲","芸",
            "芊","茉","芮","芩","滢","汐","潼","洛","溪","涵",

            // 柔美/温柔风
            "柔","媚","婉","娇","恬","忆","念","惜","怜","依",
            "伊","尹","允","韵","筠","云","霓","霏","霖","霜",
            "露","灵","幻","梦","幻","眠","思","念","情","愫",

            // 珍宝/美玉类（女性专用）
            "瑶","瑾","琪","琳","琅","璇","璋","璧","玲","珑",
            "珈","珊","瑚","琦","璇","莹","瑶","琼","瑛","瑜",
            "珂","玥","玲","珍","珠","环","佩","琮","琬","琰",

            // 花草植物类（女性专用）
            "花","卉","芍","药","茉","莉","兰","梅","荷","菊",
            "桂","萱","蓉","芸","芷","芮","菁","菲","莎","茉",
            "莉","莲","樱","桃","杏","梨","莓","苗","芝","萍",

            // 色彩/自然意象
            "彩","虹","霞","霓","雯","云","露","雪","霜","月",
            "星","晨","曦","汐","溪","洛","沁","涵","清","滢",

            // 传统女性字（70-90后常用）
            "秀","英","兰","凤","梅","莲","菊","桂","香","玉",
            "金","银","玲","珍","珠","凤","霞","翠","玉","红",
            "绿","青","碧","彩","香","巧","美","倩","爱","惠",

            // 现代/洋气/日韩风
            "熙","恩","智","允","妍","智","雅","琳","娜","熙",
            "妍","汐","恩","智","允","真","率","妍","智","孝",
            "琳","雅","茜","妮","娜","莎","玛","莉","娅","妮",

            // 温柔气质类
            "娴","婉","婧","妤","婕","婵","嫣","婷","媛","妙",
            "姿","媚","婉","娇","恬","静","安","宁","怡","悦",

            // 小说高频女名专用（你当前项目专用）
            "晗","惜","梦","若","兮","凝","霜","雪","月","秋",
            "夏","冬","春","秋","烟","寒","影","幽","灵","韵",
            "音","舞","羽","衣","念","思","情","柔","依","诺"
        };

        // 中性字（男女通用）
        private static readonly HashSet<string> NeutralWords = new HashSet<string>
        {
            "文","一","子","中","嘉","乐","晨","雨","泽","宇",
            "宁","安","旭","然","新","天","景","恒","俊","恩"
        };

        // 典型女性叠字：如婷婷、圆圆、丽丽
        private static readonly HashSet<string> FemaleRepeatWords = new HashSet<string>
        {
            "婷","丽","莉","芳","菲","佳","静","敏","燕","琳"
        };

        // 复姓列表
        private static readonly HashSet<string> CompoundSurnames = new HashSet<string>
        {
            "欧阳","太史","端木","上官","司马","东方","独孤","南宫",
            "万俟","闻人","夏侯","诸葛","尉迟","公羊","赫连","澹台",
            "皇甫","宗政","濮阳","公冶","太叔","申屠","公孙","慕容"
        };

        /// <summary>
        /// 预测姓名性别（核心方法）
        /// </summary>
        /// <param name="name">姓名（支持 2-4字）</param>
        /// <returns>Y / N / </returns>
        public static string PredictGender(string name)
        {
            if (string.IsNullOrWhiteSpace(name) || name.Length < 2)
                return "";

            name = name.Trim();

            // 提取姓氏和名字
            var (surname, givenName) = SplitSurnameAndName(name);

            // 单字名
            if (givenName.Length == 1)
                return PredictSingleWordName(givenName);

            // 双字名 / 三字名
            return PredictMultiWordName(givenName);
        }

        /// <summary>
        /// 拆分姓氏和名字（自动识别复姓）
        /// </summary>
        private static (string Surname, string GivenName) SplitSurnameAndName(string name)
        {
            // 复姓判断（长度>=2）
            if (name.Length >= 3)
            {
                var firstTwoChars = name.Substring(0, 2);
                if (CompoundSurnames.Contains(firstTwoChars))
                {
                    return (firstTwoChars, name.Substring(2));
                }
            }

            // 单姓
            return (name[0].ToString(), name.Substring(1));
        }

        /// <summary>
        /// 单字名性别判断
        /// </summary>
        private static string PredictSingleWordName(string word)
        {
            if (MaleWords.Contains(word)) return YesNoPolicy.YES;
            if (FemaleWords.Contains(word)) return YesNoPolicy.NO;
            return "";
        }

        /// <summary>
        /// 双字/三字名性别判断
        /// </summary>
        private static string PredictMultiWordName(string givenName)
        {
            int maleScore = 0;
            int femaleScore = 0;

            var chars = givenName.ToCharArray().Select(c => c.ToString()).ToList();

            // 逐字打分
            foreach (var c in chars)
            {
                if (MaleWords.Contains(c)) maleScore += 10;
                else if (FemaleWords.Contains(c)) femaleScore += 10;
                else if (NeutralWords.Contains(c)) { }
                else maleScore += 1; // 生僻字默认偏男
            }

            // 规则1：叠字 99% 女性（如婷婷、菲菲、娜娜）
            if (givenName.Length >= 2 && givenName[0] == givenName[1])
            {
                string c = givenName[0].ToString();
                if (FemaleRepeatWords.Contains(c) || FemaleWords.Contains(c))
                    return YesNoPolicy.NO;
            }

            // 规则2：强特征字优先
            bool hasStrongMale = chars.Any(MaleWords.Contains);
            bool hasStrongFemale = chars.Any(FemaleWords.Contains);

            if (hasStrongMale && !hasStrongFemale) return YesNoPolicy.YES;
            if (hasStrongFemale && !hasStrongMale) return YesNoPolicy.NO;

            // 规则3：分数对比
            if (maleScore > femaleScore) return YesNoPolicy.YES;
            if (femaleScore > maleScore) return YesNoPolicy.NO;

            return "";
        }

        /// <summary>
        /// 简化调用：直接返回 bool? (true=男,false=女,null=未知)
        /// </summary>
        public static bool? IsMale(string name)
        {
            var g = PredictGender(name);
            return g == YesNoPolicy.YES ? true : g == YesNoPolicy.NO ? false : null;
        }
    }
}