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

namespace LehrerApp.Tests;

public sealed class StudentMasterDataCsvImportHandlerTests
{
    private readonly StudentMasterDataCsvImportHandler _handler = new();

    [Fact]
    public async Task Detect_ErkenntDieCharakteristischenSpaltenUnabhaengigVomDateinamen()
    {
        var detection = await _handler.DetectAsync(File(ValidFile(), "export.data"));

        Assert.True(detection.IsMatch);
        Assert.Equal(95, detection.Confidence);
    }

    [Fact]
    public async Task Detect_LehntEineBeliebigeCsvDateiAb()
    {
        var detection = await _handler.DetectAsync(File("Vorname;Nachname\nMax;Beispiel"));

        Assert.False(detection.IsMatch);
    }

    [Fact]
    public async Task Parse_UebernimmtDieUnterstuetztenStammdaten()
    {
        var result = await _handler.ParseAsync(File(ValidFile()));

        Assert.True(result.IsValid);
        Assert.Equal(2, result.Items.Count);

        var first = result.Items[0];
        Assert.Equal("Max", first.FirstName);
        Assert.Equal("Beispiel", first.LastName);
        Assert.Equal(Gender.M, first.Gender);
        Assert.Equal(new DateOnly(2010, 1, 2), first.DateOfBirth);
        Assert.Equal("4711", first.ExternalId);
        Assert.Equal("10c", first.GroupName);
        Assert.Equal("Zeile 2", first.SourceReference);
        Assert.Equal("max@example.invalid", first.Contact?.Email);
        Assert.Equal("01234", first.Contact?.Phone);
        Assert.Equal("Musterweg 1", first.Contact?.Street);

        Assert.Equal(Gender.W, result.Items[1].Gender);
        Assert.Empty(result.Messages);
    }

    [Fact]
    public async Task Parse_UngueltigesGeburtsdatumErzeugtEinenFehlerMitZeilenangabe()
    {
        var text = ValidFile().Replace("02.01.2010", "2010-01-02");

        var result = await _handler.ParseAsync(File(text));

        Assert.False(result.IsValid);
        var error = Assert.Single(result.Messages,
            message => message.Code == "master-data.birth-date.invalid");
        Assert.Equal("Zeile 2", error.SourceReference);
    }

    [Fact]
    public async Task Parse_BehandeltTabulatorenUndAnfuehrungszeichenInTextfeldern()
    {
        var text = ValidFile().Replace("Musterweg 1", "\"Musterweg\t\"\"Nord\"\" 1\"");

        var result = await _handler.ParseAsync(File(text));

        Assert.True(result.IsValid);
        Assert.Equal(2, result.Items.Count);
    }

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

    private static string ValidFile()
    {
        var header = string.Join('\t',
        [
            "name", "longName", "foreName", "gender", "birthDate", "klasse.name",
            "entryDate", "exitDate", "text", "id", "externKey", "medicalReportDuty",
            "schulpflicht", "majority", "address.email", "address.mobile", "address.phone",
            "address.city", "address.postCode", "address.street", "attribute.iL",
        ]);
        var first = string.Join('\t',
        [
            "max.b", "Beispiel", "Max", "m", "02.01.2010", "10c",
            "01.08.2021", "", "", "100", "4711", "false", "false", "false",
            "max@example.invalid", "", "01234", "Beispielstadt", "12345", "Musterweg 1", "max.b",
        ]);
        var second = string.Join('\t',
        [
            "erika.m", "Mustermann", "Erika", "w", "03.04.2010", "10c",
            "01.08.2021", "", "", "101", "4712", "false", "false", "false",
            "", "", "", "", "", "", "erika.m",
        ]);
        return string.Join('\n', header, first, second) + "\n";
    }
}