using FluentAssertions;
using StellaOps.Microservice;
using StellaOps.Router.Common.Models;
using Xunit;

namespace StellaOps.Microservice.Tests;

public class EndpointRegistryTests
{
    private static EndpointDescriptor CreateEndpoint(string method, string path, Type? handlerType = null)
    {
        return new EndpointDescriptor
        {
            ServiceName = "test-service",
            Version = "1.0.0",
            Method = method,
            Path = path,
            HandlerType = handlerType
        };
    }

    [Fact]
    public void TryMatch_ExactMatch_ReturnsEndpoint()
    {
        var registry = new EndpointRegistry();
        var endpoint = CreateEndpoint("GET", "/api/users");
        registry.Register(endpoint);

        var result = registry.TryMatch("GET", "/api/users", out var match);

        result.Should().BeTrue();
        match.Should().NotBeNull();
        match!.Endpoint.Should().Be(endpoint);
        match.PathParameters.Should().BeEmpty();
    }

    [Fact]
    public void TryMatch_MethodMismatch_ReturnsFalse()
    {
        var registry = new EndpointRegistry();
        registry.Register(CreateEndpoint("GET", "/api/users"));

        var result = registry.TryMatch("POST", "/api/users", out var match);

        result.Should().BeFalse();
        match.Should().BeNull();
    }

    [Fact]
    public void TryMatch_PathMismatch_ReturnsFalse()
    {
        var registry = new EndpointRegistry();
        registry.Register(CreateEndpoint("GET", "/api/users"));

        var result = registry.TryMatch("GET", "/api/products", out var match);

        result.Should().BeFalse();
        match.Should().BeNull();
    }

    [Fact]
    public void TryMatch_WithPathParameter_ExtractsParameter()
    {
        var registry = new EndpointRegistry();
        registry.Register(CreateEndpoint("GET", "/api/users/{id}"));

        var result = registry.TryMatch("GET", "/api/users/123", out var match);

        result.Should().BeTrue();
        match.Should().NotBeNull();
        match!.PathParameters.Should().ContainKey("id");
        match.PathParameters["id"].Should().Be("123");
    }

    [Fact]
    public void TryMatch_MethodCaseInsensitive_ReturnsMatch()
    {
        var registry = new EndpointRegistry();
        registry.Register(CreateEndpoint("GET", "/api/users"));

        var result = registry.TryMatch("get", "/api/users", out var match);

        result.Should().BeTrue();
        match.Should().NotBeNull();
    }

    [Fact]
    public void TryMatch_PathCaseInsensitive_ReturnsMatch()
    {
        var registry = new EndpointRegistry();
        registry.Register(CreateEndpoint("GET", "/api/users"));

        var result = registry.TryMatch("GET", "/API/USERS", out var match);

        result.Should().BeTrue();
        match.Should().NotBeNull();
    }

    [Fact]
    public void RegisterAll_MultipeEndpoints_AllRegistered()
    {
        var registry = new EndpointRegistry();
        var endpoints = new[]
        {
            CreateEndpoint("GET", "/api/users"),
            CreateEndpoint("POST", "/api/users"),
            CreateEndpoint("GET", "/api/users/{id}")
        };

        registry.RegisterAll(endpoints);

        registry.GetAllEndpoints().Should().HaveCount(3);
    }

    [Fact]
    public void GetAllEndpoints_ReturnsAllRegistered()
    {
        var registry = new EndpointRegistry();
        var endpoint1 = CreateEndpoint("GET", "/api/users");
        var endpoint2 = CreateEndpoint("POST", "/api/users");
        registry.Register(endpoint1);
        registry.Register(endpoint2);

        var all = registry.GetAllEndpoints();

        all.Should().HaveCount(2);
        all.Should().Contain(endpoint1);
        all.Should().Contain(endpoint2);
    }

    [Fact]
    public void TryMatch_FirstMatchWins_WhenMultiplePossible()
    {
        var registry = new EndpointRegistry();
        var endpoint1 = CreateEndpoint("GET", "/api/users/{id}");
        var endpoint2 = CreateEndpoint("GET", "/api/{resource}/{id}");
        registry.Register(endpoint1);
        registry.Register(endpoint2);

        var result = registry.TryMatch("GET", "/api/users/123", out var match);

        result.Should().BeTrue();
        match.Should().NotBeNull();
        // First registered endpoint should match
        match!.Endpoint.Should().Be(endpoint1);
    }

    [Fact]
    public void TryMatch_EmptyRegistry_ReturnsFalse()
    {
        var registry = new EndpointRegistry();

        var result = registry.TryMatch("GET", "/api/users", out var match);

        result.Should().BeFalse();
        match.Should().BeNull();
    }

    [Fact]
    public void Constructor_CaseSensitive_RespectsSetting()
    {
        var registry = new EndpointRegistry(caseInsensitive: false);
        registry.Register(CreateEndpoint("GET", "/api/users"));

        var result = registry.TryMatch("GET", "/API/USERS", out var match);

        result.Should().BeFalse();
    }
}