using Api.SeaHavenIndustries.Controllers;
using FluentAssertions;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.ActionConstraints;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.Extensions.DependencyInjection;
using Xunit;
using Xunit.Abstractions;

namespace Api.SeaHavenIndustries.Tests;

/// <summary>
/// Framework-backed route contract tests that prove the public endpoint set exposed by the
/// WorkOrder URL space (api/WorkOrder, api/workorders) is preserved exactly after splitting the
/// original godfile WorkOrderController into cohesive controllers, and that no verb+route
/// combination is registered more than once by different actions.
///
/// Routes are read from the ASP.NET Core action descriptor provider so the EXACT templates the
/// framework will dispatch are compared, including multi-attribute actions (e.g. Editworkorder)
/// and the two shared controller-level base routes.
/// </summary>
public class WorkOrderRouteContractTests
{
    private readonly ITestOutputHelper _output;

    private static readonly HashSet<Type> WorkOrderFamilyControllerTypes = new()
    {
        typeof(WorkOrderController),
        typeof(WorkOrderBoardController),
        typeof(WorkOrderDetailController),
        typeof(WorkOrderCompletionController),
        typeof(WorkOrderMediaController),
        typeof(WorkOrderDispatchController),
    };

    /// <summary>
    /// Baseline public endpoint set (verb + action-relative route) that the original single
    /// WorkOrderController exposed, plus the author-only board-comment edit endpoint (SH-122).
    /// Every action is reachable under both api/WorkOrder and api/workorders; that base-route
    /// duplication is collapsed here, so this is the distinct action-relative contract. 52 routes
    /// come from 51 actions (Editworkorder binds two routes).
    /// </summary>
    private static readonly HashSet<string> ExpectedWorkOrderEndpoints = new(StringComparer.Ordinal)
    {
        "DELETE DeleteWorkorder",
        "DELETE completion-templates/{id:int}",
        "DELETE {id:int}/media/{mediaId:int}",
        "GET GetComments",
        "GET GetCommentsByWorkorderId",
        "GET GetDispatch/{id}",
        "GET GetDispatches/{workOrderId}",
        "GET GetFilteredWorkorder",
        "GET GetFilteredWorkorder2",
        "GET GetWorkOrderList",
        "GET GetWorkorderById",
        "GET Getworkorders",
        "GET GetworkordersDD",
        "GET board",
        "GET board/search",
        "GET completion-templates",
        "GET completion-templates/{id:int}",
        "GET lookups/dispatchers",
        "GET {id:int}",
        "GET {id:int}/audit",
        "GET {id:int}/comments",
        "GET {id:int}/detail",
        "GET {id:int}/uplifts",
        "GET {id:int}/media",
        "GET {id:int}/media/{mediaId:int}/content",
        "PATCH {id:int}/board",
        "PATCH {id:int}/comments/{commentId:int}",
        "PATCH {id:int}/media/{mediaId:int}",
        "PATCH {id:int}/poc",
        "POST AddChecklistItem",
        "POST AddComment",
        "POST AddCommentJson",
        "POST AddDispatchComment",
        "POST AddDispatchSignoff",
        "POST AddWorkorder",
        "POST ChangeAssignment",
        "POST ChangeStatus",
        "POST DispatchToVendor",
        "POST EditWorkorder",
        "POST UpdateChecklistItem",
        "POST UpdateDispatch",
        "POST VerifyDispatch",
        "POST board",
        "POST completion-templates",
        "POST {id:int}/cancel",
        "POST {id:int}/comments",
        "POST {id:int}/completion-doc",
        "POST {id:int}/media",
        "POST {id:int}/uplifts",
        "POST {id:int}/uplifts/{upliftId:int}/cancel",
        "POST {id:int}/uplifts/{upliftId:int}/revoke",
        "PUT completion-templates/{id:int}",
        "PUT {id:int}",
    };

    public WorkOrderRouteContractTests(ITestOutputHelper output)
    {
        _output = output;
    }

    private static IReadOnlyList<ActionDescriptor> BuildActionDescriptors()
    {
        var services = new ServiceCollection();
        services.AddLogging();
        services.AddMvcCore()
            .AddApplicationPart(typeof(WorkOrderController).Assembly);

        using var provider = services.BuildServiceProvider();
        var actionProvider = provider.GetRequiredService<IActionDescriptorCollectionProvider>();
        return actionProvider.ActionDescriptors.Items;
    }

    private static IReadOnlyList<(string Verb, string FullTemplate, string Controller, string Action)> FullRoutesFor(
        Func<ActionDescriptor, bool> predicate)
    {
        var tuples = new List<(string Verb, string FullTemplate, string Controller, string Action)>();
        foreach (var action in BuildActionDescriptors().Where(predicate))
        {
            var cad = action as ControllerActionDescriptor;
            var template = cad?.AttributeRouteInfo?.Template?.Trim('/');
            if (string.IsNullOrEmpty(template))
                continue;

            var methods = action.ActionConstraints
                .OfType<HttpMethodActionConstraint>()
                .SelectMany(c => c.HttpMethods)
                .Distinct(StringComparer.OrdinalIgnoreCase);

            foreach (var method in methods)
                tuples.Add((method.ToUpperInvariant(), template, cad!.ControllerName, cad.ActionName));
        }

        return tuples;
    }

    private static string Normalize(string fullTemplate)
    {
        foreach (var prefix in new[] { "api/WorkOrder/", "api/workorders/" })
        {
            if (fullTemplate.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
                return fullTemplate[prefix.Length..];
        }
        foreach (var exact in new[] { "api/WorkOrder", "api/workorders" })
        {
            if (fullTemplate.Equals(exact, StringComparison.OrdinalIgnoreCase))
                return string.Empty;
        }
        return fullTemplate;
    }

    [Fact]
    public void WorkOrder_Family_Preserves_Expected_Public_Endpoint_Set()
    {
        var actual = FullRoutesFor(a => a is ControllerActionDescriptor cad
                                        && WorkOrderFamilyControllerTypes.Contains(cad.ControllerTypeInfo))
            .Select(t => $"{t.Verb} {Normalize(t.FullTemplate)}")
            .ToHashSet(StringComparer.Ordinal);

        Dump(actual);

        var missing = ExpectedWorkOrderEndpoints.Except(actual).OrderBy(x => x).ToList();
        var unexpected = actual.Except(ExpectedWorkOrderEndpoints).OrderBy(x => x).ToList();

        missing.Should().BeEmpty("every pre-split WorkOrder endpoint must still be reachable");
        unexpected.Should().BeEmpty("the split must not introduce new public WorkOrder endpoints");
        actual.Should().HaveCount(ExpectedWorkOrderEndpoints.Count,
            "the distinct action-relative endpoint count must match the baseline");
        actual.Should().NotContain(endpoint =>
            endpoint.Contains("documents", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void WorkOrder_Family_Does_Not_Expose_Documents_Route()
    {
        ExpectedWorkOrderEndpoints.Should().Contain("GET {id:int}/media/{mediaId:int}/content");
        ExpectedWorkOrderEndpoints.Should().NotContain(endpoint =>
            endpoint.Contains("documents", StringComparison.OrdinalIgnoreCase));

        var actual = FullRoutesFor(a => a is ControllerActionDescriptor cad
                                        && WorkOrderFamilyControllerTypes.Contains(cad.ControllerTypeInfo))
            .Select(t => $"{t.Verb} {Normalize(t.FullTemplate)}")
            .ToHashSet(StringComparer.Ordinal);

        actual.Should().NotContain(endpoint =>
            endpoint.Contains("documents", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void WorkOrder_Family_Has_No_Duplicate_Verb_And_Route_From_Different_Actions()
    {
        // Duplicate detection is done at the FULL route-template level. Each action legitimately
        // resolves under both base routes (api/WorkOrder and api/workorders); those are distinct
        // full templates. A true collision is the SAME full template produced by two actions,
        // which would cause an AmbiguousMatchException at request time.
        var collisions = FullRoutesFor(a => a is ControllerActionDescriptor cad
                                            && WorkOrderFamilyControllerTypes.Contains(cad.ControllerTypeInfo))
            .GroupBy(t => (t.Verb, t.FullTemplate))
            .Where(g => g.Select(x => (x.Controller, x.Action)).Distinct().Count() > 1)
            .Select(g => $"{g.Key.Verb} {g.Key.FullTemplate} -> {string.Join(", ", g.Select(x => $"{x.Controller}.{x.Action}"))}")
            .ToList();

        collisions.Should().BeEmpty(
            "no two actions in the WorkOrder family may register the same verb+full-route");
    }

    [Fact]
    public void WorkOrder_Url_Space_Has_No_Duplicate_Verb_And_Route_From_Different_Actions()
    {
        var collisions = FullRoutesFor(_ => true)
            .Where(t => t.FullTemplate.StartsWith("api/WorkOrder", StringComparison.OrdinalIgnoreCase)
                        || t.FullTemplate.StartsWith("api/workorders", StringComparison.OrdinalIgnoreCase))
            .GroupBy(t => (t.Verb, t.FullTemplate))
            .Where(g => g.Select(x => (x.Controller, x.Action)).Distinct().Count() > 1)
            .Select(g => $"{g.Key.Verb} {g.Key.FullTemplate} -> {string.Join(", ", g.Select(x => $"{x.Controller}.{x.Action}"))}")
            .ToList();

        collisions.Should().BeEmpty(
            "no two controllers sharing api/WorkOrder or api/workorders may register the same verb+full-route");
    }

    private void Dump(IEnumerable<string> endpoints)
    {
        _output.WriteLine("WorkOrder-family public endpoints (verb + action-relative route):");
        foreach (var endpoint in endpoints.OrderBy(x => x, StringComparer.Ordinal))
            _output.WriteLine("  " + endpoint);
    }
}