using GmailCatchallLabeler.Configuration;
using GmailCatchallLabeler.Gmail;
using GmailCatchallLabeler.Labels;

namespace GmailCatchallLabeler.Tests;

public sealed class RecipientExtractorTests
{
    private readonly RecipientExtractor extractor = new(new GmailOptions
    {
        CatchallDomain = "arnemoerman.be"
    });

    [Fact]
    public void ExtractLocalParts_ReadsDeliveryAndRecipientHeaders()
    {
        GmailHeader[] headers =
        [
            new("Delivered-To", "tomscott@arnemoerman.be"),
            new("To", "Example <every-foods@arnemoerman.be>, other@example.com"),
            new("Subject", "Ignored")
        ];

        var result = extractor.ExtractLocalParts(headers);

        Assert.Equal(2, result.Count);
        Assert.Contains("tomscott", result);
        Assert.Contains("every-foods", result);
    }

    [Fact]
    public void ExtractLocalParts_IsCaseInsensitiveAndDeduplicates()
    {
        GmailHeader[] headers =
        [
            new("X-Original-To", "News@ArneMoerman.be"),
            new("Cc", "news@arnemoerman.be")
        ];

        var result = extractor.ExtractLocalParts(headers);

        Assert.Single(result);
        Assert.Contains("News", result);
    }

    [Fact]
    public void ExtractLocalParts_IgnoresOtherDomainsAndMalformedHeaders()
    {
        GmailHeader[] headers =
        [
            new("To", "other@example.com"),
            new("Envelope-To", "not an address <")
        ];

        Assert.Empty(extractor.ExtractLocalParts(headers));
    }
}