// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Routing;
using Moq;

namespace Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure;

public class PageHandlerPageFilterTest
{
    [Fact]
    public async Task OnPageHandlerExecutionAsync_ExecutesAsyncFilters()
    {
        // Arrange
        var pageContext = new PageContext(new ActionContext(
            new DefaultHttpContext(),
            new RouteData(),
            new PageActionDescriptor(),
            new ModelStateDictionary()));
        var model = new Mock<PageModel>();

        var pageHandlerExecutingContext = new PageHandlerExecutingContext(
           pageContext,
           Array.Empty<IFilterMetadata>(),
           new HandlerMethodDescriptor(),
           new Dictionary<string, object>(),
           model.Object);
        var pageHandlerExecutedContext = new PageHandlerExecutedContext(
          pageContext,
          Array.Empty<IFilterMetadata>(),
          new HandlerMethodDescriptor(),
          model.Object);
        PageHandlerExecutionDelegate next = () => Task.FromResult(pageHandlerExecutedContext);

        var modelAsFilter = model.As<IAsyncPageFilter>();
        modelAsFilter
            .Setup(f => f.OnPageHandlerExecutionAsync(pageHandlerExecutingContext, next))
            .Returns(Task.CompletedTask)
            .Verifiable();

        var pageHandlerPageFilter = new PageHandlerPageFilter();

        // Act
        await pageHandlerPageFilter.OnPageHandlerExecutionAsync(pageHandlerExecutingContext, next);

        // Assert
        modelAsFilter.Verify();
    }

    [Fact]
    public async Task OnPageHandlerExecutionAsync_ExecutesSyncFilters()
    {
        // Arrange
        var pageContext = new PageContext(new ActionContext(
            new DefaultHttpContext(),
            new RouteData(),
            new PageActionDescriptor(),
            new ModelStateDictionary()));
        var model = new Mock<object>();

        var modelAsFilter = model.As<IPageFilter>();
        modelAsFilter
            .Setup(f => f.OnPageHandlerExecuting(It.IsAny<PageHandlerExecutingContext>()))
            .Verifiable();

        modelAsFilter
            .Setup(f => f.OnPageHandlerExecuted(It.IsAny<PageHandlerExecutedContext>()))
            .Verifiable();

        var pageHandlerExecutingContext = new PageHandlerExecutingContext(
           pageContext,
           Array.Empty<IFilterMetadata>(),
           new HandlerMethodDescriptor(),
           new Dictionary<string, object>(),
           model.Object);
        var pageHandlerExecutedContext = new PageHandlerExecutedContext(
          pageContext,
          Array.Empty<IFilterMetadata>(),
          new HandlerMethodDescriptor(),
          model.Object);
        PageHandlerExecutionDelegate next = () => Task.FromResult(pageHandlerExecutedContext);

        var pageHandlerPageFilter = new PageHandlerPageFilter();

        // Act
        await pageHandlerPageFilter.OnPageHandlerExecutionAsync(pageHandlerExecutingContext, next);

        // Assert
        modelAsFilter.Verify();
    }

    [Fact]
    public async Task OnPageHandlerExecutionAsync_DoesNotInvokeHandlerExecuted_IfResultIsSet()
    {
        // Arrange
        var pageContext = new PageContext(new ActionContext(
            new DefaultHttpContext(),
            new RouteData(),
            new PageActionDescriptor(),
            new ModelStateDictionary()));
        var model = new Mock<object>();

        var modelAsFilter = model.As<IPageFilter>();
        modelAsFilter
            .Setup(f => f.OnPageHandlerExecuting(It.IsAny<PageHandlerExecutingContext>()))
            .Callback((PageHandlerExecutingContext context) => context.Result = new PageResult())
            .Verifiable();

        modelAsFilter
            .Setup(f => f.OnPageHandlerExecuted(It.IsAny<PageHandlerExecutedContext>()))
            .Throws(new Exception("Shouldn't be called"));

        var pageHandlerExecutingContext = new PageHandlerExecutingContext(
           pageContext,
           Array.Empty<IFilterMetadata>(),
           new HandlerMethodDescriptor(),
           new Dictionary<string, object>(),
           model.Object);
        var pageHandlerExecutedContext = new PageHandlerExecutedContext(
          pageContext,
          Array.Empty<IFilterMetadata>(),
          new HandlerMethodDescriptor(),
          model.Object);
        PageHandlerExecutionDelegate next = () => Task.FromResult(pageHandlerExecutedContext);

        var pageHandlerPageFilter = new PageHandlerPageFilter();

        // Act
        await pageHandlerPageFilter.OnPageHandlerExecutionAsync(pageHandlerExecutingContext, next);

        // Assert
        modelAsFilter.Verify();
    }

    [Fact]
    public async Task OnPageHandlerExecutionAsync_InvokesNextDelegateIfHandlerDoesNotImplementFilter()
    {
        // Arrange
        var pageContext = new PageContext(new ActionContext(
            new DefaultHttpContext(),
            new RouteData(),
            new PageActionDescriptor(),
            new ModelStateDictionary()));
        var model = new object();

        var pageHandlerExecutingContext = new PageHandlerExecutingContext(
           pageContext,
           Array.Empty<IFilterMetadata>(),
           new HandlerMethodDescriptor(),
           new Dictionary<string, object>(),
           model);
        var pageHandlerExecutedContext = new PageHandlerExecutedContext(
          pageContext,
          Array.Empty<IFilterMetadata>(),
          new HandlerMethodDescriptor(),
          model);
        var invoked = false;
        PageHandlerExecutionDelegate next = () =>
        {
            invoked = true;
            return Task.FromResult(pageHandlerExecutedContext);
        };

        var pageHandlerPageFilter = new PageHandlerPageFilter();

        // Act
        await pageHandlerPageFilter.OnPageHandlerExecutionAsync(pageHandlerExecutingContext, next);

        // Assert
        Assert.True(invoked);
    }
}
