using System.Text;
using LehrerApp.Core.Importing;
using LehrerApp.Core.Models;
using Xunit;

namespace LehrerApp.Tests;

public sealed class LessonStudentListCsvImportHandlerTests
{
    [Fact]
    public async Task Parse_UebernimmtTeilnehmerUndOptionaleKontaktdaten()
    {
        var handler = new LessonStudentListCsvImportHandler();
        var result = await handler.ParseAsync(File(LessonList()));

        Assert.True(result.IsValid);
        var student = Assert.Single(result.Items);
        Assert.Equal("Max", student.FirstName);
        Assert.Equal("Beispiel", student.LastName);
        Assert.Equal("10c", student.GroupName);
        Assert.Equal(Gender.M, student.Gender);
        Assert.Equal("max@example.invalid", student.Contact?.Email);
        Assert.Equal("0151 123", student.Contact?.MobilePhone);
        Assert.Equal("0123 456", student.Contact?.Phone);
        Assert.Equal("Zeile 2", student.SourceReference);
    }

    [Fact]
    public async Task Detect_UnterscheidetTeilnehmerlisteVonStammdatenliste()
    {
        var handler = new LessonStudentListCsvImportHandler();

        var detection = await handler.DetectAsync(File(LessonList()));

        Assert.True(detection.IsMatch);
        Assert.Equal(100, detection.Confidence);
    }

    [Fact]
    public async Task MarksExport_WirdErkanntUndErklaertFehlendeTeilnehmerdaten()
    {
        var handler = new MarksPerLessonCsvImportHandler();
        const string header = "Datum\tName\tKlasse\tFach\tPrüfungsart\tNote\tBemerkung\tBenutzer\tSchlüssel (extern)\tGesamtnote\n";

        var detection = await handler.DetectAsync(File(header));
        var result = await handler.ParseAsync(File(header));

        Assert.True(detection.IsMatch);
        Assert.False(result.IsValid);
        Assert.Empty(result.Items);
        Assert.Contains(result.Messages, message => message.Code == "marks-per-lesson.no-participants");
    }

    private static ImportFile File(string text) => new("export.csv", Encoding.UTF8.GetBytes(text));

    private static string LessonList() => string.Join('\n',
        "Langname\tVorname\tKlasse\tGeschlecht\tEintrittsdatum\tAustrittsdatum\tE-Mail Adresse\tMobiltelefon\tTelefonnummer",
        "Beispiel\tMax\t10c\tm\t01.08.2025\t\tmax@example.invalid\t0151 123\t0123 456") + "\n";
}