using System.Text;
using System.Text.RegularExpressions;
using Rmsys.Domain.Entities;

namespace Rmsys.Infrastructure;

/// <summary>
/// 把库里的干部数据写回「干部任免审批表 3.0」标准的 .lrmx（UTF-8 XML），
/// 供「任免表编辑器 V3.0」直接打开编辑。标签名/顺序与国标模板一致。
/// </summary>
public static class LrmxExporter
{
    public const string DefaultVersion = "3.2.1.16";

    /// <summary>读取照片字节（PhotoPath 为 App_Data 下的相对路径）</summary>
    public static byte[]? LoadPhoto(string appDataRoot, string? photoPath)
        => PhotoStore.LoadBytes(appDataRoot, photoPath);

    /// <summary>生成 .lrmx 文本（含 XML 声明，调用方按 UTF-8 with BOM 落盘）</summary>
    public static string BuildXml(
        Cadre c,
        IEnumerable<CadreResume> resumes,
        IEnumerable<CadreFamily> families,
        byte[]? photo,
        string? reportDept = null,
        string? filler = null,
        string? version = null)
    {
        var sb = new StringBuilder(16 * 1024);
        sb.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n");
        sb.Append("<Person>\r\n");

        void E(string tag, string? val, bool date6 = false)
        {
            var v = date6 ? Date6ToLrmx(val) : (val ?? "").Trim();
            sb.Append("  <").Append(tag).Append('>');
            sb.Append(Esc(v));
            sb.Append("</").Append(tag).Append(">\r\n");
        }

        // ---------- 基本信息（与国标模板同序）----------
        E("XingMing", c.Name);
        E("XingBie", c.Sex);
        E("ChuShengNianYue", c.Birth, true);
        E("MinZu", c.Nation);
        E("JiGuan", c.NativePlace);
        E("ChuShengDi", c.BirthPlace);
        E("RuDangShiJian", c.PartyDate, true);
        E("CanJiaGongZuoShiJian", c.WorkDate, true);
        E("JianKangZhuangKuang", c.Health);
        E("ZhuanYeJiShuZhiWu", c.TechPost);
        E("ShuXiZhuanYeYouHeZhuanChang", c.Expertise);

        // 全日制教育
        E("QuanRiZhiJiaoYu_XueLi", c.EduFullLevel);
        E("QuanRiZhiJiaoYu_XueWei", c.EduFullDegree);
        E("QuanRiZhiJiaoYu_XueLi_BiYeYuanXiaoXi", c.EduFullSchool);
        E("QuanRiZhiJiaoYu_XueWei_BiYeYuanXiaoXi", c.EduFullMajor);
        // 在职教育
        E("ZaiZhiJiaoYu_XueLi", c.EduInLevel);
        E("ZaiZhiJiaoYu_XueWei", c.EduInDegree);
        E("ZaiZhiJiaoYu_XueLi_BiYeYuanXiaoXi", c.EduInSchool);
        E("ZaiZhiJiaoYu_XueWei_BiYeYuanXiaoXi", c.EduInMajor);

        // ---------- 职务 ----------
        E("XianRenZhiWu", c.CurrentPost);
        E("NiRenZhiWu", c.ProposedPost);
        E("NiMianZhiWu", c.DismissPost);

        // ---------- 简历：每段「起止时间  内容」一行 ----------
        var lines = new List<string>();
        foreach (var r in resumes.OrderBy(x => x.Sort))
        {
            var period = (r.Period ?? "").Trim();
            var content = (r.Content ?? "").Trim();
            if (period.Length == 0 && content.Length == 0) continue;
            lines.Add(period.Length > 0 ? period + "  " + content : content);
        }
        E("JianLi", string.Join("\n", lines));

        E("JiangChengQingKuang", c.Rewards);
        E("NianDuKaoHeJieGuo", c.Exams);
        E("RenMianLiYou", c.AppointReason);

        // ---------- 家庭主要成员 ----------
        sb.Append("  <JiaTingChengYuan>\r\n");
        foreach (var f in families.OrderBy(x => x.Sort))
        {
            if (string.IsNullOrWhiteSpace(f.Name) && string.IsNullOrWhiteSpace(f.Relation)) continue;
            sb.Append("    <Item>\r\n");
            void F(string tag, string? v)
                => sb.Append("      <").Append(tag).Append('>').Append(Esc((v ?? "").Trim())).Append("</").Append(tag).Append(">\r\n");
            F("ChengWei", f.Relation);
            F("XingMing", f.Name);
            F("ChuShengRiQi", Date6ToLrmx(f.Age));
            F("ZhengZhiMianMao", f.Political);
            F("GongZuoDanWeiJiZhiWu", f.WorkUnit);
            sb.Append("    </Item>\r\n");
        }
        sb.Append("  </JiaTingChengYuan>\r\n");

        // ---------- 表尾 ----------
        var now = DateTime.Now;
        E("ChengBaoDanWei", reportDept);
        E("JiSuanNianLingShiJian", now.ToString("yyyyMM"));
        E("TianBiaoShiJian", now.ToString("yyyyMM"));
        E("TianBiaoRen", filler);
        E("ShenFenZheng", c.IdCard);

        sb.Append("  <ZhaoPian>");
        if (photo != null && photo.Length > 0) sb.Append(Convert.ToBase64String(photo));
        sb.Append("</ZhaoPian>\r\n");

        E("Version", string.IsNullOrWhiteSpace(version) ? DefaultVersion : version);

        sb.Append("</Person>\r\n");
        return sb.ToString();
    }

    /// <summary>「1968.04」→「196804」；已是 6/8 位数字则规整；无法识别原样返回</summary>
    private static string Date6ToLrmx(string? s)
    {
        if (string.IsNullOrWhiteSpace(s)) return "";
        s = s.Trim();
        if (Regex.IsMatch(s, @"^\d{4}\.\d{1,2}$")) return s[..4] + s.Split('.')[1].PadLeft(2, '0');
        if (Regex.IsMatch(s, @"^\d{4}[/-]\d{1,2}$"))
        {
            var p = s.Split('/', '-');
            return p[0] + p[1].PadLeft(2, '0');
        }
        if (Regex.IsMatch(s, @"^\d{6}$")) return s;
        if (Regex.IsMatch(s, @"^\d{8}$")) return s[..6];
        return s;
    }

    private static string Esc(string v)
    {
        if (v.Length == 0) return "";
        return v.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;")
                .Replace("\"", "&quot;").Replace("'", "&apos;");
    }

    /// <summary>生成可供下载的字节（UTF-8 带 BOM，与国标模板一致）</summary>
    public static byte[] BuildBytes(
        Cadre c, IEnumerable<CadreResume> resumes, IEnumerable<CadreFamily> families,
        byte[]? photo, string? reportDept = null, string? filler = null, string? version = null)
    {
        var xml = BuildXml(c, resumes, families, photo, reportDept, filler, version);
        var enc = new UTF8Encoding(true);
        // GetBytes 不会自动带 BOM，必须显式拼上（国标模板是 UTF-8 with BOM）
        var preamble = enc.GetPreamble();
        var body = enc.GetBytes(xml);
        var buf = new byte[preamble.Length + body.Length];
        Buffer.BlockCopy(preamble, 0, buf, 0, preamble.Length);
        Buffer.BlockCopy(body, 0, buf, preamble.Length, body.Length);
        return buf;
    }
}