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

namespace Paca.Tests.Mobile;

public class P2pQrPayloadCodecTests
{
    [Fact]
    public void Encode_And_Decode_Roundtrip_Succeeds()
    {
        var original = new P2pQrPayload
        {
            Host = "192.168.1.100",
            Port = 5000,
            Token = "secret-token-abcdef123456",
            DeviceName = "Encep Desktop PC",
            Fingerprint = "fp_9876543210"
        };

        string encoded = P2pQrPayloadCodec.Encode(original);
        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);
        Assert.Equal(original.Fingerprint, decoded.Fingerprint);
    }

    [Fact]
    public void Decode_Invalid_Checksum_Throws()
    {
        var original = new P2pQrPayload
        {
            Host = "192.168.1.100",
            Port = 5000,
            Token = "secret-token",
            DeviceName = "PC",
            Fingerprint = "fp"
        };

        string encoded = P2pQrPayloadCodec.Encode(original);
        // 체크섬 위조
        string tampered = encoded.Replace("sig=", "sig=tampered");

        Assert.Throws<InvalidOperationException>(() => P2pQrPayloadCodec.Decode(tampered));
    }

    [Fact]
    public void Decode_NonPacaScheme_Throws()
    {
        Assert.Throws<ArgumentException>(() => P2pQrPayloadCodec.Decode("https://google.com"));
    }
}