using System.Text.RegularExpressions;
using System.Xml.Linq;

namespace Rmsys.Infrastructure;

/// <summary>
/// 干部任免审批表 3.0（.lrmx）解析器。
///
/// 格式实测（海东样本 任免审批表模板.lrmx，330KB，UTF-8 带 BOM）：
///   &lt;Person&gt; 下 34 个拼音字段 + &lt;JiaTingChengYuan&gt; 多个 &lt;Item&gt; + ZhaoPian（照片 base64）
///   日期字段为空时可能写 000101；简历为一段长文本，按「1986.10--1989.09  内容」分段。
/// 本类只做「文件 → 内存对象」，不碰数据库，便于单测与 dry-run。
/// </summary>
public class LrmxPerson
{
    public string? Name, Sex, Birth, Nation, NativePlace, BirthPlace, PartyDate, WorkDate;
    public string? Health, TechPost, Expertise;
    public string? EduFullLevel, EduFullDegree, EduFullSchool, EduFullDegreeSchool;
    public string? EduInLevel, EduInDegree, EduInSchool, EduInDegreeSchool;
    public string? CurrentPost, ProposedPost, DismissPost;
    public string? Rewards, Exams, AppointReason;
    public string? ReportDept, FillDate, Filler, IdCard, Version;
    public byte[]? Photo;
    public string? PhotoExt;
    public List<LrmxResume> Resumes = new();
    public List<LrmxFamily> Family = new();
}

public class LrmxResume
{
    public int Sort;
    /// <summary>如 1986.10--1989.09</summary>
    public string Period = "";
    public string Content = "";
}

public class LrmxFamily
{
    public int Sort;
    public string? Relation, Name, Birth, Political, WorkUnit;
}

public static class LrmxImporter
{
    /// <summary>人眼可读的报告，用于 dry-run 输出与导入回执</summary>
    public static string Describe(LrmxPerson p)
    {
        var sb = new System.Text.StringBuilder();
        void L(string k, string? v) => sb.AppendLine($"  {k,-12}{v ?? ""}");
        L("姓名", p.Name); L("性别", p.Sex); L("出生年月", p.Birth); L("民族", p.Nation);
        L("籍贯", p.NativePlace); L("出生地", p.BirthPlace);
        L("入党时间", p.PartyDate); L("参加工作", p.WorkDate); L("健康状况", p.Health);
        L("专业技术职务", p.TechPost); L("熟悉专业专长", p.Expertise);
        L("全日制", $"{p.EduFullLevel} / {p.EduFullDegree} / {p.EduFullSchool} / {p.EduFullDegreeSchool}");
        L("在职教育", $"{p.EduInLevel} / {p.EduInDegree} / {p.EduInSchool} / {p.EduInDegreeSchool}");
        L("现任职务", p.CurrentPost); L("拟任职务", p.ProposedPost); L("拟免职务", p.DismissPost);
        L("奖惩情况", p.Rewards); L("年度考核", p.Exams); L("任免理由", p.AppointReason);
        L("呈报单位", p.ReportDept); L("填表人", p.Filler); L("填表时间", p.FillDate);
        L("身份证", string.IsNullOrEmpty(p.IdCard) ? "(空)" : p.IdCard.Substring(0, Math.Min(6, p.IdCard.Length)) + "********");
        L("版本", p.Version);
        L("照片", p.Photo == null ? "(无)" : $"{p.Photo.Length / 1024} KB {p.PhotoExt}");
        sb.AppendLine($"  简历 {p.Resumes.Count} 段 / 家庭主要成员 {p.Family.Count} 人");
        foreach (var r in p.Resumes)
            sb.AppendLine($"    {r.Sort}. {r.Period}  {Crop(r.Content, 40)}");
        foreach (var f in p.Family)
            sb.AppendLine($"    {f.Relation} {f.Name}（{f.Birth}）{f.Political} {Crop(f.WorkUnit, 30)}");
        return sb.ToString();
    }

    private static string Crop(string? s, int n)
        => string.IsNullOrEmpty(s) ? "" : (s.Length <= n ? s : s[..n] + "…");

    public static LrmxPerson ParseFile(string path) => ParseText(File.ReadAllText(path));

    public static LrmxPerson ParseText(string xml)
    {
        var doc = XDocument.Parse(xml);
        var root = doc.Root ?? throw new InvalidDataException("文件为空或不是有效 XML");
        if (root.Name.LocalName != "Person")
            throw new InvalidDataException("不是任免审批表 3.0 文件（根节点应为 Person，实际 " + root.Name.LocalName + "）");

        string? V(string tag) => root.Element(tag)?.Value?.Trim() is { Length: > 0 } s ? s : null;

        var p = new LrmxPerson
        {
            Name = V("XingMing"),
            Sex = V("XingBie"),
            Birth = Date6(V("ChuShengNianYue")),
            Nation = V("MinZu"),
            NativePlace = V("JiGuan"),
            BirthPlace = V("ChuShengDi"),
            PartyDate = Date6(V("RuDangShiJian")),
            WorkDate = Date6(V("CanJiaGongZuoShiJian")),
            Health = V("JianKangZhuangKuang"),
            TechPost = V("ZhuanYeJiShuZhiWu"),
            Expertise = V("ShuXiZhuanYeYouHeZhuanChang"),
            EduFullLevel = V("QuanRiZhiJiaoYu_XueLi"),
            EduFullDegree = V("QuanRiZhiJiaoYu_XueWei"),
            EduFullSchool = V("QuanRiZhiJiaoYu_XueLi_BiYeYuanXiaoXi"),
            EduFullDegreeSchool = V("QuanRiZhiJiaoYu_XueWei_BiYeYuanXiaoXi"),
            EduInLevel = V("ZaiZhiJiaoYu_XueLi"),
            EduInDegree = V("ZaiZhiJiaoYu_XueWei"),
            EduInSchool = V("ZaiZhiJiaoYu_XueLi_BiYeYuanXiaoXi"),
            EduInDegreeSchool = V("ZaiZhiJiaoYu_XueWei_BiYeYuanXiaoXi"),
            CurrentPost = V("XianRenZhiWu"),
            ProposedPost = V("NiRenZhiWu"),
            DismissPost = V("NiMianZhiWu"),
            Rewards = V("JiangChengQingKuang"),
            Exams = V("NianDuKaoHeJieGuo"),
            AppointReason = V("RenMianLiYou"),
            ReportDept = V("ChengBaoDanWei"),
            FillDate = Date6(V("TianBiaoShiJian")),
            Filler = V("TianBiaoRen"),
            IdCard = V("ShenFenZheng"),
            Version = V("Version"),
        };

        // 简历：一段长文本，按「起止时间」切段（样本：1986.10--1989.09  步兵三师八团八连战士、班长 1989.09--…）
        var jl = V("JianLi");
        if (!string.IsNullOrEmpty(jl)) p.Resumes = SplitResume(jl);

        // 家庭主要成员
        var fam = root.Element("JiaTingChengYuan");
        if (fam != null)
        {
            int i = 1;
            foreach (var it in fam.Elements("Item"))
            {
                string? F(string t) => it.Element(t)?.Value?.Trim() is { Length: > 0 } s ? s : null;
                p.Family.Add(new LrmxFamily
                {
                    Sort = i++,
                    Relation = F("ChengWei"),
                    Name = F("XingMing"),
                    Birth = Date6(F("ChuShengRiQi")),
                    Political = F("ZhengZhiMianMao"),
                    WorkUnit = F("GongZuoDanWeiJiZhiWu"),
                });
            }
        }

        // 照片：base64，按文件头判 PNG / JPEG
        var zhaopian = V("ZhaoPian");
        if (!string.IsNullOrEmpty(zhaopian))
        {
            try
            {
                var b64 = Regex.Replace(zhaopian, @"\s", "");
                var bytes = Convert.FromBase64String(b64);
                if (bytes.Length > 200)
                {
                    p.Photo = bytes;
                    p.PhotoExt = bytes.Length > 8 && bytes[0] == 0x89 && bytes[1] == 0x50 ? ".png"
                               : bytes.Length > 3 && bytes[0] == 0xFF && bytes[1] == 0xD8 ? ".jpg" : ".bin";
                }
            }
            catch { /* 照片坏了不影响主体导入 */ }
        }

        if (string.IsNullOrWhiteSpace(p.Name))
            throw new InvalidDataException("文件里没有姓名（XingMing），无法导入");

        return p;
    }

    /// <summary>196804 → 1968.04；000101 之类的占位视为空</summary>
    private static string? Date6(string? s)
    {
        if (string.IsNullOrWhiteSpace(s)) return null;
        s = s.Trim();
        if (s is "000101" or "00000000" or "0" or "000000") return null;
        if (Regex.IsMatch(s, @"^\d{6}$")) return s[..4] + "." + s[4..];
        if (Regex.IsMatch(s, @"^\d{8}$")) return s[..4] + "." + s[4..6];
        return s;
    }

    // 允许「2012.07--」这种至今未写结束时间的写法
    private static readonly Regex PeriodRe =
        new(@"\d{4}[\.\-/]\d{1,2}\s*(?:--|—|–|~|至)+\s*(?:\d{4}[\.\-/]\d{1,2}|至今|现在)?", RegexOptions.Compiled);

    /// <summary>把简历长文本按起止时间切段；末段收尾。识别不到时间就整段作为一条。</summary>
    public static List<LrmxResume> SplitResume(string text)
    {
        var list = new List<LrmxResume>();
        var ms = PeriodRe.Matches(text);
        if (ms.Count == 0)
        {
            list.Add(new LrmxResume { Sort = 1, Period = "", Content = text.Trim() });
            return list;
        }
        // 收集真正的分段起点：跳过「（其间：2007.03-2008.01 …）」这类嵌在上一段里的经历
        var cuts = new List<(int at, int len)>();
        foreach (Match m in ms)
        {
            var back = text.Substring(Math.Max(0, m.Index - 12), Math.Min(12, m.Index));
            if (back.Contains("其间") || back.TrimEnd().EndsWith("（") || back.TrimEnd().EndsWith("(")) continue;
            cuts.Add((m.Index, m.Length));
        }
        if (cuts.Count == 0)
        {
            list.Add(new LrmxResume { Sort = 1, Period = "", Content = text.Trim() });
            return list;
        }
        // 被跳过的嵌套段（如「（其间：…）」）要补回上一段正文，否则会丢内容
        for (int i = 0; i < cuts.Count; i++)
        {
            var period = Regex.Replace(text.Substring(cuts[i].at, cuts[i].len), @"\s+", "");
            int start = cuts[i].at + cuts[i].len;
            int end = i + 1 < cuts.Count ? cuts[i + 1].at : text.Length;
            var content = text[start..end].Trim().Trim(',', '，', ';', '；');
            list.Add(new LrmxResume { Sort = i + 1, Period = period, Content = content });
        }
        return list;
    }
}