using System.Net;
using System.Text.Json;

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

using Microsoft.Extensions.Caching.Memory;

using Moq;
using Moq.Protected;

using MudBlazor;

namespace MesaFabApproval.Client.Test;

public class PCRBFollowUpCommentTests {
    private readonly Mock<IMemoryCache> _mockCache;
    private readonly Mock<IHttpClientFactory> _mockHttpClientFactory;
    private readonly Mock<ISnackbar> _mockSnackbar;
    private readonly Mock<IUserService> _mockUserService;
    private readonly PCRBService _pcrbService;

    private static PCRBFollowUpComment FOLLOW_UP_COMMENT = new PCRBFollowUpComment {
        ID = 1,
        PlanNumber = 123,
        FollowUpID = 1,
        Comment = "Test Comment",
        UserID = 1
    };

    private static HttpResponseMessage GET_RESPONSE = new HttpResponseMessage {
        StatusCode = HttpStatusCode.OK,
        Content = new StringContent(JsonSerializer.Serialize(new List<PCRBFollowUpComment> { FOLLOW_UP_COMMENT }))
    };

    private static IEnumerable<PCRBFollowUpComment> FOLLOW_UPS_COMMENTS = new List<PCRBFollowUpComment>() { FOLLOW_UP_COMMENT };

    private static HttpResponseMessage SUCCESSFUL_RESPONSE = new HttpResponseMessage(HttpStatusCode.OK);
    private static HttpResponseMessage UNSUCCESSFUL_RESPONSE = new HttpResponseMessage(HttpStatusCode.InternalServerError);

    public PCRBFollowUpCommentTests() {
        _mockCache = MockMemoryCacheService.GetMemoryCache(FOLLOW_UPS_COMMENTS);
        _mockHttpClientFactory = new Mock<IHttpClientFactory>();
        _mockSnackbar = new Mock<ISnackbar>();
        _mockUserService = new Mock<IUserService>();

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

    [Fact]
    public async Task CreateFollowUpComment_WithValidParams_ShouldCallHttpPost_AndRefreshCache() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Post),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(SUCCESSFUL_RESPONSE)
            .Verifiable();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Get),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(GET_RESPONSE)
            .Verifiable();

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

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

        await _pcrbService.CreateFollowUpComment(FOLLOW_UP_COMMENT);

        mockHttpMessageHandler.Protected().Verify(
            "SendAsync",
            Times.Once(),
            ItExpr.Is<HttpRequestMessage>(
                req => 
                    req.Method == HttpMethod.Post &&
                    req.RequestUri != null &&
                    req.RequestUri.AbsoluteUri.Equals("https://localhost:5000/pcrb/followUpComment")),
            ItExpr.IsAny<CancellationToken>());

        mockHttpMessageHandler.Protected().Verify(
            "SendAsync",
            Times.Once(),
            ItExpr.Is<HttpRequestMessage>(
                req => 
                    req.Method == HttpMethod.Get &&
                    req.RequestUri != null &&
                    req.RequestUri.AbsoluteUri.Equals("https://localhost:5000/pcrb/followUpComments?planNumber=123&bypassCache=True")),
            ItExpr.IsAny<CancellationToken>());
    }

    [Fact]
    public async Task CreateFollowUpComment_WithBadResponse_ShouldThrowException() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Post),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(UNSUCCESSFUL_RESPONSE)
            .Verifiable();

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

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

        await Assert.ThrowsAsync<Exception>(() => _pcrbService.CreateFollowUpComment(FOLLOW_UP_COMMENT));
    }

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

    [Fact]
    public async Task GetFollowUpCommentsByPlanNumber_WithBypassCache_ShouldCallHttpGetAndReturnFollowUps() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Get),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(GET_RESPONSE)
            .Verifiable();

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

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

        IEnumerable<PCRBFollowUpComment> comments = await _pcrbService.GetFollowUpCommentsByPlanNumber(123, true);

        mockHttpMessageHandler.Protected().Verify(
            "SendAsync",
            Times.Once(),
            ItExpr.Is<HttpRequestMessage>(
                req =>
                    req.Method == HttpMethod.Get &&
                    req.RequestUri != null &&
                    req.RequestUri.AbsoluteUri.Equals("https://localhost:5000/pcrb/followUpComments?planNumber=123&bypassCache=True")),
            ItExpr.IsAny<CancellationToken>());

        Assert.Single(comments);
    }

    [Fact]
    public async Task GetFollowUpCommentsByPlanNumber_WithoutBypassCache_ShouldReturnFollowUpsFromCache() {
        IEnumerable<PCRBFollowUpComment> comments = await _pcrbService.GetFollowUpCommentsByPlanNumber(1, false);
        Assert.Single(comments);
    }

    [Fact]
    public async Task GetFollowUpCommentsByPlanNumber_WithBadResponse_ShouldThrowException() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Get),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(UNSUCCESSFUL_RESPONSE)
            .Verifiable();

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

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

        await Assert.ThrowsAsync<Exception>(() => _pcrbService.GetFollowUpCommentsByPlanNumber(1, true));
    }

    [Fact]
    public async Task UpdateFollowUpComment_WithValidParams_ShouldCallHttpPut() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Put),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(SUCCESSFUL_RESPONSE)
            .Verifiable();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Get),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(GET_RESPONSE)
            .Verifiable();

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

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

        await _pcrbService.UpdateFollowUpComment(FOLLOW_UP_COMMENT);

        mockHttpMessageHandler.Protected().Verify(
            "SendAsync",
            Times.Once(),
            ItExpr.Is<HttpRequestMessage>(
                req =>
                    req.Method == HttpMethod.Put &&
                    req.RequestUri != null &&
                    req.RequestUri.AbsoluteUri.Equals("https://localhost:5000/pcrb/followUpComment")),
            ItExpr.IsAny<CancellationToken>());

        mockHttpMessageHandler.Protected().Verify(
            "SendAsync",
            Times.Once(),
            ItExpr.Is<HttpRequestMessage>(
                req =>
                    req.Method == HttpMethod.Get &&
                    req.RequestUri != null &&
                    req.RequestUri.AbsoluteUri.Equals("https://localhost:5000/pcrb/followUpComments?planNumber=123&bypassCache=True")),
            ItExpr.IsAny<CancellationToken>());
    }

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

    [Fact]
    public async Task UpdateFollowUpComment_WithBadResponse_ShouldThrowException() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Put),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(UNSUCCESSFUL_RESPONSE)
            .Verifiable();

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

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

        await Assert.ThrowsAsync<Exception>(() => _pcrbService.UpdateFollowUpComment(FOLLOW_UP_COMMENT));
    }

    [Fact]
    public async Task DeleteFollowUpComment_WithValidParams_ShouldCallHttpDelete() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Delete),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(SUCCESSFUL_RESPONSE)
            .Verifiable();

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

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

        await _pcrbService.DeleteFollowUpComment(1);

        mockHttpMessageHandler.Protected().Verify(
            "SendAsync",
            Times.Once(),
            ItExpr.Is<HttpRequestMessage>(
                req =>
                    req.Method == HttpMethod.Delete &&
                    req.RequestUri != null &&
                    req.RequestUri.AbsoluteUri.Equals("https://localhost:5000/pcrb/followUpComment?id=1")),
            ItExpr.IsAny<CancellationToken>());
    }

    [Fact]
    public async Task DeleteFollowUpComment_WithBadId_ShouldThrowException() {
        await Assert.ThrowsAsync<ArgumentException>(() => _pcrbService.DeleteFollowUpComment(0));
    }

    [Fact]
    public async Task DeleteFollowUpComment_WithBadResponse_ShouldThrowException() {
        Mock<HttpMessageHandler> mockHttpMessageHandler = new Mock<HttpMessageHandler>();

        mockHttpMessageHandler.Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(_ => _.Method == HttpMethod.Delete),
                ItExpr.IsAny<CancellationToken>())
            .ReturnsAsync(UNSUCCESSFUL_RESPONSE)
            .Verifiable();

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

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

        await Assert.ThrowsAsync<Exception>(() => _pcrbService.DeleteFollowUpComment(1));
    }
}