using Microsoft.AspNetCore.Http;
using StellaOps.Gateway.WebService.Routing;
using StellaOps.Router.Gateway.Configuration;

namespace StellaOps.Gateway.WebService.Tests.Routing;

public sealed class StellaOpsRouteResolverTests
{
    private static StellaOpsRoute MakeRoute(
        string path,
        StellaOpsRouteType type = StellaOpsRouteType.Microservice,
        bool isRegex = false,
        string? translatesTo = null)
    {
        return new StellaOpsRoute
        {
            Path = path,
            Type = type,
            IsRegex = isRegex,
            TranslatesTo = translatesTo ?? "http://backend:5000"
        };
    }

    [Fact]
    public void Resolve_ExactPathMatch_ReturnsRoute()
    {
        var route = MakeRoute("/dashboard");
        var resolver = new StellaOpsRouteResolver(new[] { route });

        var result = resolver.Resolve(new PathString("/dashboard"));

        Assert.NotNull(result.Route);
        Assert.Equal("/dashboard", result.Route.Path);
        Assert.Null(result.RegexMatch);
    }

    [Fact]
    public void Resolve_PrefixMatch_ReturnsRoute()
    {
        var route = MakeRoute("/app");
        var resolver = new StellaOpsRouteResolver(new[] { route });

        var result = resolver.Resolve(new PathString("/app/index.html"));

        Assert.NotNull(result.Route);
        Assert.Equal("/app", result.Route.Path);
        Assert.Null(result.RegexMatch);
    }

    [Fact]
    public void Resolve_RegexRoute_Matches()
    {
        var route = MakeRoute(@"^/api/v[0-9]+/.*", isRegex: true);
        var resolver = new StellaOpsRouteResolver(new[] { route });

        var result = resolver.Resolve(new PathString("/api/v2/data"));

        Assert.NotNull(result.Route);
        Assert.True(result.Route.IsRegex);
        Assert.Equal(@"^/api/v[0-9]+/.*", result.Route.Path);
        Assert.NotNull(result.RegexMatch);
        Assert.True(result.RegexMatch.Success);
    }

    [Fact]
    public void Resolve_RegexRoute_ReturnsCaptureGroups()
    {
        var route = MakeRoute(
            @"^/api/v1/([^/]+)(.*)",
            isRegex: true,
            translatesTo: "http://$1.stella-ops.local/api/v1/$1$2");
        var resolver = new StellaOpsRouteResolver(new[] { route });

        var result = resolver.Resolve(new PathString("/api/v1/scanner/health"));

        Assert.NotNull(result.Route);
        Assert.NotNull(result.RegexMatch);
        Assert.Equal("scanner", result.RegexMatch.Groups[1].Value);
        Assert.Equal("/health", result.RegexMatch.Groups[2].Value);
    }

    [Fact]
    public void Resolve_NoMatch_ReturnsNull()
    {
        var route = MakeRoute("/dashboard");
        var resolver = new StellaOpsRouteResolver(new[] { route });

        var result = resolver.Resolve(new PathString("/unknown"));

        Assert.Null(result.Route);
        Assert.Null(result.RegexMatch);
    }

    [Fact]
    public void Resolve_FirstMatchWins()
    {
        var firstRoute = MakeRoute("/api", translatesTo: "http://first:5000");
        var secondRoute = MakeRoute("/api", translatesTo: "http://second:5000");
        var resolver = new StellaOpsRouteResolver(new[] { firstRoute, secondRoute });

        var result = resolver.Resolve(new PathString("/api/resource"));

        Assert.NotNull(result.Route);
        Assert.Equal("http://first:5000", result.Route.TranslatesTo);
    }

    [Fact]
    public void Resolve_NotFoundPageRoute_IsExcluded()
    {
        var notFoundRoute = MakeRoute("/not-found", type: StellaOpsRouteType.NotFoundPage);
        var resolver = new StellaOpsRouteResolver(new[] { notFoundRoute });

        var result = resolver.Resolve(new PathString("/not-found"));

        Assert.Null(result.Route);
    }

    [Fact]
    public void Resolve_ServerErrorPageRoute_IsExcluded()
    {
        var errorRoute = MakeRoute("/error", type: StellaOpsRouteType.ServerErrorPage);
        var resolver = new StellaOpsRouteResolver(new[] { errorRoute });

        var result = resolver.Resolve(new PathString("/error"));

        Assert.Null(result.Route);
    }

    [Fact]
    public void Resolve_CaseInsensitive_Matches()
    {
        var route = MakeRoute("/app");
        var resolver = new StellaOpsRouteResolver(new[] { route });

        var result = resolver.Resolve(new PathString("/APP"));

        Assert.NotNull(result.Route);
        Assert.Equal("/app", result.Route.Path);
    }

    [Fact]
    public void Resolve_EmptyRoutes_ReturnsNull()
    {
        var resolver = new StellaOpsRouteResolver(Array.Empty<StellaOpsRoute>());

        var result = resolver.Resolve(new PathString("/anything"));

        Assert.Null(result.Route);
    }
}