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

namespace Paca.Tests.Core;

public class ProxyAutoConfigGateTests
{
    [Fact]
    public void Gate397_ProxyAutoConfig_GeneratesStandardJavaScriptPac()
    {
        var config = new PacConfig
        {
            DefaultAction = "DIRECT",
            Rules = new List<PacRoutingRule>
            {
                new("*.youtube.com", "PROXY 127.0.0.1:1080; DIRECT"),
                new("*.googlevideo.com", "PROXY 127.0.0.1:1080; DIRECT")
            }
        };

        var pacScript = ProxyAutoConfigEngine.GeneratePacScript(config);

        Assert.Contains("function FindProxyForURL(url, host)", pacScript);
        Assert.Contains("shExpMatch(host, \"*.youtube.com\")", pacScript);
        Assert.Contains("return \"PROXY 127.0.0.1:1080; DIRECT\";", pacScript);
        Assert.Contains("return \"DIRECT\";", pacScript);
    }

    [Fact]
    public void Gate398_ProxyAutoConfig_EvaluatesHostRoute_ForMatchingDomain()
    {
        var config = new PacConfig
        {
            DefaultAction = "DIRECT",
            Rules = new List<PacRoutingRule>
            {
                new("*.instagram.com", "PROXY proxy.corp:8080"),
                new("*.tiktok.com", "SOCKS5 127.0.0.1:9050")
            }
        };

        var routeInstagram = ProxyAutoConfigEngine.EvaluateHostRoute(config, "www.instagram.com");
        Assert.Equal("PROXY proxy.corp:8080", routeInstagram);

        var routeTiktok = ProxyAutoConfigEngine.EvaluateHostRoute(config, "v16.tiktok.com");
        Assert.Equal("SOCKS5 127.0.0.1:9050", routeTiktok);
    }

    [Fact]
    public void Gate399_ProxyAutoConfig_FallsBackToDirect_ForUnmatchedDomain()
    {
        var config = new PacConfig
        {
            DefaultAction = "DIRECT",
            Rules = new List<PacRoutingRule>
            {
                new("*.twitter.com", "PROXY 127.0.0.1:8080")
            }
        };

        var route = ProxyAutoConfigEngine.EvaluateHostRoute(config, "github.com");
        Assert.Equal("DIRECT", route);
    }

    [Fact]
    public void Gate400_ProxyAutoConfig_HandlesEmptyRulesGracefully()
    {
        var emptyConfig = new PacConfig { DefaultAction = "DIRECT" };
        var script = ProxyAutoConfigEngine.GeneratePacScript(emptyConfig);

        Assert.Contains("return \"DIRECT\";", script);
        Assert.Equal("DIRECT", ProxyAutoConfigEngine.EvaluateHostRoute(emptyConfig, "example.com"));
    }
}