using System.Xml;

namespace SheetMe.Data.Stores;

/// <summary>E_SctMst 저장 행 1건 — XML 트리 순회 산출물</summary>
public sealed class SctRow
{
    /// <summary>컨트롤 이름(SctObjNam)</summary>
    public string ObjName { get; init; } = string.Empty;

    /// <summary>계층 알파벳 ID(SctObjID) — 15자 우측 공백 패딩</summary>
    public string ObjId { get; init; } = string.Empty;

    /// <summary>타입 풀네임(SctObjTyp) — AQN 의 첫 콤마 앞</summary>
    public string ObjType { get; init; } = string.Empty;

    /// <summary>부모 알파벳 ID(SctParObj) — 15자 우측 공백 패딩</summary>
    public string ParentId { get; init; } = string.Empty;

    /// <summary>표시 순서(SctObjSeq) — DisplaySequence 어트리뷰트</summary>
    public string ObjSeq { get; init; } = string.Empty;

    /// <summary>텍스트(SctObjTxt) — Text Property 원문</summary>
    public string ObjText { get; init; } = string.Empty;
}

/// <summary>
/// 서식 XML → E_SctMst 행 목록 변환 — 레거시 bzSaveSheetDesignNControlInfo.SaveE_SctMst 의 순수 이식.
/// 모델이 아닌 '최종 직렬화된 XML'을 순회해 100% 패리티(Spread AsTemplate 특례 포함)를 보장한다.
/// </summary>
public static class SctMstXmlWalker
{
    #region Methods
    /// <summary>병합 XML 의 전체 Object 트리를 E_SctMst 행 목록으로 (루트 MDesignerHost 포함 — 레거시 규약)</summary>
    public static List<SctRow> Walk(string mergedXml)
    {
        var rows = new List<SctRow>();
        var xml = new XmlDocument();
        xml.LoadXml(mergedXml);

        var objId = "A";
        foreach (XmlNode node in xml.DocumentElement!.ChildNodes)
        {
            if (node.Name.Equals("Object", StringComparison.Ordinal))
            {
                AddRow(rows, (XmlElement)node, objId, string.Empty);
                WalkChildren(rows, (XmlElement)node, objId);
            }
            // 레거시 동작 보존: 시퀀스는 노드 종류와 무관하게 진행(Sheet 자식은 Object 뿐이라 동일)
            objId = NextAlphabetSequence(objId);
        }
        return rows;
    }

    /// <summary>알파벳 시퀀스 증가 — A→B…Z→AA→AB…, 전부 Z 면 자릿수 확장(clsCommonLib 이식)</summary>
    public static string NextAlphabetSequence(string current)
    {
        var chars = current.ToCharArray();
        var index = chars.Length - 1;
        while (index >= 0 && chars[index] == 'Z')
        {
            chars[index] = 'A';
            index--;
        }
        if (index < 0)
        {
            return "A" + new string(chars);
        }
        chars[index]++;
        return new string(chars);
    }

    private static void WalkChildren(List<SctRow> rows, XmlElement parent, string parentObjId)
    {
        var childId = "AA";
        foreach (XmlNode child in parent.ChildNodes)
        {
            if (!child.Name.Equals("Object", StringComparison.Ordinal))
            {
                continue;
            }
            AddRow(rows, (XmlElement)child, parentObjId + childId, parentObjId);
            WalkChildren(rows, (XmlElement)child, parentObjId + childId);
            childId = NextAlphabetSequence(childId);
        }
    }

    private static void AddRow(List<SctRow> rows, XmlElement node, string objId, string parentId)
    {
        var name = node.GetAttribute("name");
        var typeFullName = node.GetAttribute("type").Split(',')[0];
        var displaySequence = node.GetAttribute("DisplaySequence");

        var text = string.Empty;
        string? spreadControlType = null;
        string? spreadItemList = null;

        foreach (XmlNode child in node.ChildNodes)
        {
            if (!child.Name.Equals("Property", StringComparison.OrdinalIgnoreCase) || child is not XmlElement prop)
            {
                continue;
            }
            var propName = prop.GetAttribute("name");
            if (propName.Equals("Text", StringComparison.OrdinalIgnoreCase))
            {
                text = prop.InnerText;
            }
            else if (propName.Equals("ControlType", StringComparison.OrdinalIgnoreCase))
            {
                spreadControlType = prop.InnerText;
            }
            else if (propName.Equals("ControlTypeAsTemplate_ItemLIST", StringComparison.OrdinalIgnoreCase))
            {
                spreadItemList = prop.InnerText;
            }
        }

        rows.Add(new SctRow
        {
            ObjName = name,
            ObjId = objId.PadRight(15),
            ObjType = typeFullName,
            ParentId = parentId.PadRight(15),
            ObjSeq = displaySequence,
            ObjText = text,
        });

        // Spread AsTemplate 특례 — 항목 목록을 개별 행으로(레거시 이식, Chr(5) 구분)
        if (string.Equals(typeFullName, "M.EMR.UserControl.Spread", StringComparison.OrdinalIgnoreCase)
            && string.Equals(spreadControlType, "AsTemplate", StringComparison.OrdinalIgnoreCase)
            && spreadItemList is not null)
        {
            var items = spreadItemList.Split((char)5);
            for (var i = 0; i < items.Length - 1; i++)
            {
                rows.Add(new SctRow
                {
                    ObjName = items[i],
                    ObjId = i.ToString(),
                    ObjType = "ItemOfSpreadAsTemplate",
                    ParentId = string.Empty,
                    ObjSeq = string.Empty,
                    ObjText = i.ToString().PadLeft(3, '0') + "_" + items[i],
                });
            }
        }
    }
    #endregion
}