using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Routing;
using w4c_workflows.Filters;
using Xunit;

namespace w4c_workflows.Tests;

/// <summary>
/// P1-14: an operator key with no recorded scopes must not silently pass every
/// scope check. It is denied when <c>Auth:EnforceScopes</c> is on (the migration
/// switch) and stays allowed otherwise so legacy/seed keys keep working. A key
/// that does carry scopes must match exactly, and JWT/render-token surfaces skip
/// the operator-key check entirely.
/// </summary>
public class RequireScopeAttributeTests
{
    private static ActionExecutingContext Context(
        string? authKind,
        IReadOnlyList<string>? scopes,
        bool enforceScopes)
    {
        var http = new DefaultHttpContext();
        if (authKind != null)
            http.Items["AuthKind"] = authKind;
        if (scopes != null)
            http.Items["Scopes"] = scopes;
        http.Items["EnforceScopes"] = enforceScopes;

        var actionContext = new ActionContext(http, new RouteData(), new ActionDescriptor());
        return new ActionExecutingContext(
            actionContext, new List<IFilterMetadata>(), new Dictionary<string, object?>(), controller: null!);
    }

    private static async Task<(bool NextCalled, ActionExecutingContext Context)> InvokeAsync(
        ActionExecutingContext context, string requiredScope)
    {
        var called = false;
        var filter = new RequireScopeAttribute(requiredScope);
        ActionExecutedContext Next()
        {
            called = true;
            return new ActionExecutedContext(
                context, new List<IFilterMetadata>(), controller: null!);
        }

        await filter.OnActionExecutionAsync(context, () => Task.FromResult(Next()));
        return (called, context);
    }

    private static int? ForbiddenStatus(ActionExecutingContext context)
        => (context.Result as ObjectResult)?.StatusCode;

    [Fact]
    public async Task Matching_scope_allows_the_action()
    {
        var (called, context) = await InvokeAsync(Context("operator", new[] { "read" }, false), "read");

        Assert.True(called);
        Assert.Null(context.Result);
    }

    [Fact]
    public async Task Non_matching_scope_is_forbidden()
    {
        var (called, context) = await InvokeAsync(Context("operator", new[] { "read" }, false), "manage");

        Assert.False(called);
        Assert.Equal(StatusCodes.Status403Forbidden, ForbiddenStatus(context));
    }

    [Fact]
    public async Task Empty_scope_set_is_denied_when_enforcement_is_on()
    {
        var (called, context) = await InvokeAsync(Context("operator", Array.Empty<string>(), true), "manage");

        Assert.False(called);
        Assert.Equal(StatusCodes.Status403Forbidden, ForbiddenStatus(context));
    }

    [Fact]
    public async Task Empty_scope_set_legacy_key_still_passes_without_enforcement()
    {
        var (called, context) = await InvokeAsync(Context("operator", Array.Empty<string>(), false), "manage");

        Assert.True(called);
        Assert.Null(context.Result);
    }

    [Fact]
    public async Task Missing_scope_item_is_denied_when_enforcement_is_on()
    {
        var (called, context) = await InvokeAsync(Context("operator", scopes: null, enforceScopes: true), "manage");

        Assert.False(called);
        Assert.Equal(StatusCodes.Status403Forbidden, ForbiddenStatus(context));
    }

    [Theory]
    [InlineData("jwt")]
    [InlineData("render-token")]
    public async Task Non_operator_key_surfaces_skip_the_scope_check(string authKind)
    {
        var (called, context) = await InvokeAsync(Context(authKind, scopes: null, enforceScopes: true), "manage");

        Assert.True(called);
        Assert.Null(context.Result);
    }
}