using System;
using System.IO;
using System.Security.Cryptography;
using System.Threading.Tasks;
using Paca.Server;
using Paca.Server.Gateway;
using Xunit;

namespace Paca.Tests.Mobile;

/// <summary>
/// Gate 139 ~ 143: 백그라운드 게이트웨이 상주 서비스, 신뢰 기기 원클릭 페어링 핸드셰이크, Windows 시작 등록 규격 검증
/// </summary>
public class MobileGatewayDaemonAndHandshakeGateTests
{
    [Fact]
    public void Gate139_TrustedDevicesStore_Add_And_Authorize()
    {
        var store = new TrustedDevicesStore();
        Assert.Empty(store.GetTrustedDevices());

        var device = new TrustedDevice(
            DeviceId: "device-uuid-99",
            DeviceName: "Galaxy-S24-Ultra",
            Fingerprint: "FP-GALAXY-99",
            IsApproved: true,
            RegisteredAt: DateTimeOffset.UtcNow,
            LastSeenAt: DateTimeOffset.UtcNow
        );

        store.RegisterDevice(device);
        Assert.Single(store.GetTrustedDevices());
        Assert.True(store.IsDeviceTrusted("device-uuid-99"));
        Assert.False(store.IsDeviceTrusted("unknown-device"));
    }

    [Fact]
    public void Gate140_OneClickPairing_Handshake_Resolves_Token()
    {
        var store = new TrustedDevicesStore();
        var handshakeEngine = new OneClickPairingEngine(store, serverToken: "MASTER-PACA-TOKEN-SECRET");

        // 1. 신규 기기 핸드셰이크 요청 (페어링 허용 모드)
        var req = new PairingHandshakeRequest(
            ClientDeviceId: "client-phone-01",
            ClientDeviceName: "iPhone 16 Pro",
            ClientFingerprint: "FINGERPRINT-IPHONE",
            IsOneClickRequest: true
        );

        var resp = handshakeEngine.ProcessHandshake(req, autoApproveNewLanClients: true);
        Assert.NotNull(resp);
        Assert.True(resp.Success);
        Assert.Equal("MASTER-PACA-TOKEN-SECRET", resp.IssuedToken);
        Assert.True(store.IsDeviceTrusted("client-phone-01"));

        // 2. 신규 기기 등록 불허 모드에서는 거절
        var req2 = new PairingHandshakeRequest(
            ClientDeviceId: "untrusted-stranger",
            ClientDeviceName: "Unknown-Device",
            ClientFingerprint: "FP-UNKNOWN",
            IsOneClickRequest: true
        );
        var resp2 = handshakeEngine.ProcessHandshake(req2, autoApproveNewLanClients: false);
        Assert.NotNull(resp2);
        Assert.False(resp2.Success);
        Assert.Null(resp2.IssuedToken);
    }

    [Fact]
    public void Gate141_GatewayStartupConfig_Command_Arguments()
    {
        var config = new GatewayStartupConfig(
            RunOnWindowsStartup: true,
            StartMinimizedToTray: true,
            AutoPortForwarding: true,
            HttpPort: 52100
        );

        var args = config.ToCommandLineArgs();
        Assert.Contains("--gateway-daemon", args);
        Assert.Contains("--tray", args);
        Assert.Contains("--port 52100", args);

        var parsed = GatewayStartupConfig.ParseArgs(args);
        Assert.True(parsed.StartMinimizedToTray);
        Assert.Equal(52100, parsed.HttpPort);
    }

    [Fact]
    public void Gate142_GatewayDaemon_Heartbeat_And_Status()
    {
        var daemon = new PacaGatewayDaemonState(
            DeviceName: "Encep-Studio-PC",
            HttpPort: 52100,
            LanBeaconActive: true,
            WanGatewayActive: true,
            ConnectCode: "PACA-982143"
        );

        Assert.True(daemon.IsOperational);
        Assert.Equal("PACA-982143", daemon.ConnectCode);
        Assert.Equal("http://localhost:52100", daemon.LocalEndpoint);
    }
}