using SheetMe.Core.Models;
using SheetMe.Core.Serialization;

namespace SheetMe.Core.Tests;

/// <summary>
/// 레거시 XML 왕복 무결성 테스트 — P0 게이트.
/// 실서식 샘플(sheetdesign_sample.xml)을 Read→Write 했을 때 의미론 diff 가 0 이어야 한다.
/// </summary>
[TestClass]
public sealed class LegacyXmlRoundTripTests
{
    private static string SamplePath
        => Path.Combine(AppContext.BaseDirectory, "Assets", "sheetdesign_sample.xml");

    /// <summary>실서식 샘플 왕복 — 의미론 diff 0</summary>
    [TestMethod]
    public void RoundTrip_RealSample_NoSemanticDiff()
    {
        var original = File.ReadAllText(SamplePath);
        var serializer = new LegacyXmlSerializer();

        var document = serializer.Read(original);
        var rewritten = serializer.Write(document);

        var diffs = XmlSemanticDiff.Compare(original, rewritten);
        Assert.AreEqual(0, diffs.Count,
            "왕복 의미론 diff 발생:\n" + string.Join("\n", diffs));
    }

    /// <summary>실서식 샘플 이중 왕복 — Write 출력이 안정(고정점)이어야 한다</summary>
    [TestMethod]
    public void RoundTrip_RealSample_SecondPassIsStable()
    {
        var original = File.ReadAllText(SamplePath);
        var serializer = new LegacyXmlSerializer();

        var first = serializer.Write(serializer.Read(original));
        var second = serializer.Write(serializer.Read(first));

        Assert.AreEqual(first, second, "이중 왕복 결과가 문자열 수준에서 안정적이지 않습니다.");
    }

    /// <summary>실서식 샘플 구조 확인 — 페이지/컨트롤 수·타입 매핑</summary>
    [TestMethod]
    public void Read_RealSample_ParsesStructure()
    {
        var serializer = new LegacyXmlSerializer();
        var document = serializer.Read(File.ReadAllText(SamplePath));

        Assert.AreEqual(1, document.Pages.Count, "샘플은 단일 페이지여야 합니다.");
        var page = document.Pages[0];
        Assert.AreEqual("MDesignerHost1", page.Root.Id);
        Assert.AreEqual(823, page.Width, "루트 Size 리프트(823×1250) 실패");
        Assert.AreEqual(1250, page.Height);

        // 샘플 실측: MLine 34, TextBox 33, Label 27, RadioButton 15, Panel 6, MSequence 1, MPictureBox 1
        var allControls = Flatten(page.Controls).ToList();
        Assert.AreEqual(117, allControls.Count, "전체 컨트롤 수(루트 제외) 불일치");
        Assert.AreEqual(34, allControls.Count(c => c.Type == "Line"));
        Assert.AreEqual(33, allControls.Count(c => c.Type == "TextBox"));
        Assert.AreEqual(28, allControls.Count(c => c.Type == "Label"), "Label 27 + MSequence 1 = 28");
        Assert.AreEqual(15, allControls.Count(c => c.Type == "RadioButton"));
        Assert.AreEqual(6, allControls.Count(c => c.Type == "Panel"));
        Assert.AreEqual(1, allControls.Count(c => c.Type == "PictureBox"));
        Assert.AreEqual(0, allControls.Count(c => c.Type == LegacyTypeCatalog.PlaceholderType),
            "샘플에는 미지원 타입이 없어야 합니다.");
    }

    /// <summary>다중 페이지 병합 규약 — Sheet 루트 1개에 MDesignerHost Object N개</summary>
    [TestMethod]
    public void RoundTrip_MultiPage_PreservesPages()
    {
        const string xml =
            "<Sheet name=\"SheetDesignInfo\">" +
            "<Object type=\"M.EMR.UserControl.MDesignerHost, M.EMR.UserControl, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null\" name=\"MDesignerHost1\" children=\"Controls\" DisplaySequence=\"0\">" +
            "<Property name=\"Size\">720, 856</Property>" +
            "</Object>" +
            "<Object type=\"M.EMR.UserControl.MDesignerHost, M.EMR.UserControl, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null\" name=\"MDesignerHost1\" children=\"Controls\" DisplaySequence=\"0\">" +
            "<Property name=\"Size\">720, 856</Property>" +
            "</Object>" +
            "</Sheet>";

        var serializer = new LegacyXmlSerializer();
        var document = serializer.Read(xml);

        Assert.AreEqual(2, document.Pages.Count);

        var rewritten = serializer.Write(document);
        var diffs = XmlSemanticDiff.Compare(xml, rewritten);
        Assert.AreEqual(0, diffs.Count, string.Join("\n", diffs));
    }

    /// <summary>신규 컨트롤 추가 후 쓰기 — Location/Size/AQN 이 레거시 형식으로 생성</summary>
    [TestMethod]
    public void Write_NewControl_EmitsLegacyFormat()
    {
        var serializer = new LegacyXmlSerializer();
        var document = new FormDocument();
        var page = LegacyXmlSerializer.CreateEmptyPage(1);
        document.Pages.Add(page);

        var textBox = new ControlElement
        {
            Type = "TextBox",
            Id = "TextBox1",
            Bounds = new LayoutRect { X = 120, Y = 88, W = 200, H = 24 },
        };
        textBox.Props.SetText("Text", "환자명");
        page.Controls.Add(textBox);

        var xml = serializer.Write(document);

        StringAssert.Contains(xml, "M.EMR.UserControl.TextBox, M.EMR.UserControl, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null");
        StringAssert.Contains(xml, "<Property name=\"Location\">120, 88</Property>");
        StringAssert.Contains(xml, "<Property name=\"Size\">200, 24</Property>");
        StringAssert.Contains(xml, "<Property name=\"Text\">환자명</Property>");

        // 재읽기 시 동일 구조
        var reread = serializer.Read(xml);
        Assert.AreEqual(1, reread.Pages[0].Controls.Count);
        Assert.AreEqual("TextBox", reread.Pages[0].Controls[0].Type);
        Assert.AreEqual(120, reread.Pages[0].Controls[0].Bounds.X);
    }

    /// <summary>컨테이너 중첩 시 LocationOnBase 재계산 — 절대좌표(부모 누적) 규약</summary>
    [TestMethod]
    public void Write_NestedControl_RecomputesLocationOnBase()
    {
        const string xml =
            "<Sheet name=\"SheetDesignInfo\">" +
            "<Object type=\"M.EMR.UserControl.MDesignerHost, M.EMR.UserControl, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null\" name=\"MDesignerHost1\" children=\"Controls\" DisplaySequence=\"0\">" +
            "<Object type=\"M.EMR.UserControl.Panel, M.EMR.UserControl, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null\" name=\"Panel1\" children=\"Controls\" DisplaySequence=\"0\">" +
            "<Object type=\"M.EMR.UserControl.TextBox, M.EMR.UserControl, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null\" name=\"TextBox1\" children=\"Controls\" DisplaySequence=\"0\">" +
            "<Property name=\"LocationOnBase\">0, 0</Property>" +
            "<Property name=\"Location\">10, 20</Property>" +
            "<Property name=\"Size\">100, 22</Property>" +
            "</Object>" +
            "<Property name=\"Location\">50, 60</Property>" +
            "<Property name=\"Size\">200, 100</Property>" +
            "</Object>" +
            "<Property name=\"Size\">720, 856</Property>" +
            "</Object>" +
            "</Sheet>";

        var serializer = new LegacyXmlSerializer();
        var document = serializer.Read(xml);
        var rewritten = serializer.Write(document);

        // Panel(50,60) 안의 TextBox(10,20) → LocationOnBase = 60, 80 (레거시 writer 재계산 규약)
        StringAssert.Contains(rewritten, "<Property name=\"LocationOnBase\">60, 80</Property>");
    }

    private static IEnumerable<ControlElement> Flatten(IEnumerable<ControlElement> controls)
    {
        foreach (var control in controls)
        {
            yield return control;
            foreach (var child in Flatten(control.Children))
            {
                yield return child;
            }
        }
    }
}