using System.IO;
using Paca.Mobile.Core;
using Xunit;

namespace Paca.Tests.Mobile;

public class MobileQrPairingUiGateTests
{
    private static readonly string SolutionRoot = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));

    [Fact]
    public void Gate_QrPayloadCodec_Roundtrip_EnsuresIntegrity()
    {
        var original = new P2pQrPayload
        {
            Host = "192.168.1.100",
            Port = 52100,
            Token = "secret-token-xyz-12345",
            DeviceName = "MyDesktop-PC",
            Fingerprint = "fp-abc"
        };

        var encoded = P2pQrPayloadCodec.Encode(original);
        Assert.NotNull(encoded);
        Assert.StartsWith("paca://pair?", encoded);

        var decoded = P2pQrPayloadCodec.Decode(encoded);
        Assert.NotNull(decoded);
        Assert.Equal(original.Host, decoded.Host);
        Assert.Equal(original.Port, decoded.Port);
        Assert.Equal(original.Token, decoded.Token);
        Assert.Equal(original.DeviceName, decoded.DeviceName);
    }

    [Fact]
    public void Gate_QrPayloadCodec_RejectsCorruptOrInvalidQr()
    {
        Assert.Throws<ArgumentException>(() => P2pQrPayloadCodec.Decode(""));
        Assert.Throws<ArgumentException>(() => P2pQrPayloadCodec.Decode("INVALID_QR_FORMAT"));
        Assert.Throws<InvalidOperationException>(() => P2pQrPayloadCodec.Decode("paca://pair?h=127.0.0.1&p=5000&t=tok&sig=wrong"));
    }

    [Fact]
    public void Gate_SyncSettingsPage_Contains_QrScanButton_And_CodecWiring()
    {
        var syncPagePath = Path.Combine(SolutionRoot, "src", "Paca.Mobile", "SyncSettingsPage.cs");
        Assert.True(File.Exists(syncPagePath), $"SyncSettingsPage.cs not found at {syncPagePath}");

        var code = File.ReadAllText(syncPagePath);
        Assert.True(code.Contains("P2pQrPayloadCodec.Decode") || code.Contains("P2pQrPayloadCodec"),
            "SyncSettingsPage.cs must wire P2pQrPayloadCodec to decode QR scan results");
        Assert.True(code.Contains("QR") || code.Contains("Qr"),
            "SyncSettingsPage.cs must provide a QR Scan pairing interaction element");
    }
}