using ImportAssist.Core;
using Xunit;

namespace ImportAssist.Core.Tests;

public sealed class InvoiceCsvParserTests
{
    private const string Header =
        "InvoiceId;CustomerId;Amount;Currency";

    [Fact]
    public void Parse_PreservesEmptyFieldsAndRawAmount()
    {
        var csv = $"{Header}\nINV-001;;abc;EUR";

        var rows = InvoiceCsvParser.Parse(csv);

        var row = Assert.Single(rows);

        Assert.Equal(
            new InvoiceRow("INV-001", "", "abc", "EUR"),
            row);
    }

    [Theory]
    [InlineData("")]
    [InlineData("InvoiceId;Amount")]
    public void Parse_RejectsMissingOrIncorrectHeader(string csv)
    {
        var exception = Assert.Throws<FormatException>(
            () => InvoiceCsvParser.Parse(csv));

        Assert.Equal(
            "Die Datei ist leer oder die Kopfzeile stimmt nicht.",
            exception.Message);
    }

    [Theory]
    [InlineData("INV-002;C-200;89.00")]
    [InlineData("INV-002;C-200;89.00;EUR;extra")]
    [InlineData("INV-002;\"C-200\";89.00;EUR")]
    public void Parse_RejectsMalformedRowWithCorrectLineNumber(
        string malformedRow)
    {
        var csv =
            $"{Header}\nINV-001;C-100;125.50;EUR\n{malformedRow}";

        var exception = Assert.Throws<FormatException>(
            () => InvoiceCsvParser.Parse(csv));

        Assert.Equal(
            "Zeile 3: Erwartet werden vier Spalten ohne Anführungszeichen.",
            exception.Message);
    }
}