using System.Net;
using System.Net.Http;
using System.Threading.Tasks;

using MesaFabApproval.Client.Services;
using MesaFabApproval.Shared.Models;

using Microsoft.Extensions.Caching.Memory;

using Moq;
using Moq.Protected;

using MudBlazor;

using Xunit;

namespace MesaFabApproval.Client.Test;

public class PCRBServiceTests {
    private readonly Mock<IMemoryCache> _mockCache;
    private readonly Mock<IHttpClientFactory> _mockHttpClientFactory;
    private readonly Mock<ISnackbar> _mockSnackbar;
    private readonly Mock<IUserService> _mockUserService;
    private readonly Mock<PCRB> _mockPCRB;
    private readonly Mock<Approval> _mockApproval;

    private readonly PCRBService _pcrbService;

    public PCRBServiceTests() {
        _mockCache = new Mock<IMemoryCache>();
        _mockHttpClientFactory = new Mock<IHttpClientFactory>();
        _mockSnackbar = new Mock<ISnackbar>();
        _mockUserService = new Mock<IUserService>();
        _mockPCRB = new Mock<PCRB>();
        _mockApproval = new Mock<Approval>();

        _pcrbService = new PCRBService(
            _mockCache.Object,
            _mockHttpClientFactory.Object,
            _mockSnackbar.Object,
            _mockUserService.Object
        );
    }

    [Fact]
    public async Task NotifyApprover_ShouldSendNotification() {
        PCRBNotification notification = new PCRBNotification {
            Message = "Test Message",
            PCRB = _mockPCRB.Object,
            Approval = _mockApproval.Object
        };

        Mock<HttpMessageHandler> handlerMock = new Mock<HttpMessageHandler>();
        handlerMock
            .Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Post),
                ItExpr.IsAny<CancellationToken>()
            )
            .ReturnsAsync(new HttpResponseMessage {
                StatusCode = HttpStatusCode.OK
            })
            .Verifiable();

        HttpClient httpClient = new HttpClient(handlerMock.Object) {
            BaseAddress = new Uri("https://localhost:5000")
        };

        _mockHttpClientFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);

        await _pcrbService.NotifyApprover(notification);

        handlerMock.Protected().Verify(
            "SendAsync",
            Times.Once(),
            ItExpr.Is<HttpRequestMessage>(req =>
                req.Method == HttpMethod.Post &&
                req.RequestUri == new Uri("https://localhost:5000/pcrb/notify/approver")
            ),
            ItExpr.IsAny<CancellationToken>()
        );
    }

    [Fact]
    public async Task NotifyApprover_ShouldThrowException_WhenResponseIsNotSuccess() {
        PCRBNotification notification = new PCRBNotification {
            Message = "Test Message",
            PCRB = _mockPCRB.Object,
            Approval = _mockApproval.Object
        };

        var handlerMock = new Mock<HttpMessageHandler>();
        handlerMock
            .Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Post),
                ItExpr.IsAny<CancellationToken>()
            )
            .ReturnsAsync(new HttpResponseMessage {
                StatusCode = HttpStatusCode.BadRequest,
                ReasonPhrase = "Bad Request"
            });

        HttpClient httpClient = new HttpClient(handlerMock.Object) {
            BaseAddress = new Uri("https://localhost:5000")
        };

        _mockHttpClientFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);

        Exception exception = await Assert.ThrowsAsync<Exception>(() => _pcrbService.NotifyApprover(notification));
        Assert.Equal("Unable to notify PCRB approver, because Bad Request", exception.Message);
    }

    [Fact]
    public async Task NotifyApprover_ShouldThrowException_WhenNotificationIsNull() {
        await Assert.ThrowsAsync<ArgumentNullException>(() => _pcrbService.NotifyApprover(null));
    }

    [Fact]
    public async Task NotifyApprover_ShouldThrowException_WhenPCRBIsNull() {
        PCRBNotification notification = new PCRBNotification {
            Message = "Test Message",
            PCRB = null,
            Approval = _mockApproval.Object
        };

        await Assert.ThrowsAsync<ArgumentNullException>(() => _pcrbService.NotifyApprover(notification));
    }

    [Fact]
    public async Task NotifyApprover_ShouldThrowException_WhenApprovalIsNull() {
        PCRBNotification notification = new PCRBNotification {
            Message = "Test Message",
            PCRB = _mockPCRB.Object,
            Approval = null
        };

        await Assert.ThrowsAsync<ArgumentNullException>(() => _pcrbService.NotifyApprover(notification));
    }

    [Fact]
    public async Task NotifyApprover_ShouldThrowException_WhenMessageIsNullOrEmpty() {
        PCRBNotification notification = new PCRBNotification {
            Message = null,
            PCRB = _mockPCRB.Object,
            Approval = _mockApproval.Object
        };

        await Assert.ThrowsAsync<ArgumentException>(() => _pcrbService.NotifyApprover(notification));

        notification.Message = string.Empty;
        await Assert.ThrowsAsync<ArgumentException>(() => _pcrbService.NotifyApprover(notification));
    }
}