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 PCRBServiceTests {
    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 IEnumerable<PCRBFollowUp> FOLLOW_UPS = new List<PCRBFollowUp>() {
        new PCRBFollowUp { ID = 1, PlanNumber = 1, Step = 1, FollowUpDate = DateTime.Now }
    };

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

    public static class MockMemoryCacheService {
        public static Mock<IMemoryCache> GetMemoryCache(object expectedValue) {
            Mock<IMemoryCache> mockMemoryCache = new Mock<IMemoryCache>();
            mockMemoryCache
                .Setup(x => x.TryGetValue(It.IsAny<object>(), out expectedValue))
                .Returns(true);
            mockMemoryCache
                .Setup(x => x.CreateEntry(It.IsAny<object>()))
                .Returns(Mock.Of<ICacheEntry>());
            return mockMemoryCache;
        }
    }

    public PCRBServiceTests() {
        _mockCache = MockMemoryCacheService.GetMemoryCache(FOLLOW_UPS);
        _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 CreateFollowUp_WithValidParams_ShouldCallHttpPost_AndRefreshCache() {
        PCRBFollowUp followUp = new PCRBFollowUp {
            ID = 1,
            PlanNumber = 123,
            Step = 1,
            FollowUpDate = DateTime.Now,
            Comments = "Test"
        };

        HttpResponseMessage getResponse = new HttpResponseMessage {
            StatusCode = HttpStatusCode.OK,
            Content = new StringContent(JsonSerializer.Serialize(new List<PCRBFollowUp> { followUp }))
        };

        var 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(getResponse)
            .Verifiable();

        var httpClient = new HttpClient(mockHttpMessageHandler.Object) {
            BaseAddress = new Uri("https://localhost:5000")
        };
        _mockHttpClientFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);

        await _pcrbService.CreateFollowUp(followUp);

        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/followUp")),
            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/followUps?planNumber=123&bypassCache=True")),
            ItExpr.IsAny<CancellationToken>());
    }

    [Fact]
    public async Task CreateFollowUp_WithBadResponse_ShouldThrowException() {
        PCRBFollowUp followUp = new PCRBFollowUp {
            ID = 1,
            PlanNumber = 123,
            Step = 1,
            FollowUpDate = DateTime.Now,
            Comments = "Test"
        };

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

        var httpClient = new HttpClient(mockHttpMessageHandler.Object) {
            BaseAddress = new Uri("https://localhost:5000")
        };
        _mockHttpClientFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);

        await Assert.ThrowsAsync<Exception>(() => _pcrbService.CreateFollowUp(followUp));
    }

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

    [Fact]
    public async Task GetFollowUpsByPlanNumber_WithBypassCache_ShouldCallHttpGetAndReturnFollowUps() {
        PCRBFollowUp followUp = new PCRBFollowUp {
            ID = 1,
            PlanNumber = 123,
            Step = 1,
            FollowUpDate = DateTime.Now,
            Comments = "Test"
        };

        HttpResponseMessage getResponse = new HttpResponseMessage {
            StatusCode = HttpStatusCode.OK,
            Content = new StringContent(JsonSerializer.Serialize(new List<PCRBFollowUp> { followUp }))
        };

        var mockHttpMessageHandler = new Mock<HttpMessageHandler>();

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

        var httpClient = new HttpClient(mockHttpMessageHandler.Object) {
            BaseAddress = new Uri("https://localhost:5000")
        };
        _mockHttpClientFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);

        IEnumerable<PCRBFollowUp> followUps = await _pcrbService.GetFollowUpsByPlanNumber(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/followUps?planNumber=123&bypassCache=True")),
            ItExpr.IsAny<CancellationToken>());

        Assert.Single(followUps);
    }

    [Fact]
    public async Task GetFollowUpsByPlanNumber_WithoutBypassCache_ShouldReturnFollowUpsFromCache() {
        IEnumerable<PCRBFollowUp> followUps = await _pcrbService.GetFollowUpsByPlanNumber(1, false);
        Assert.Single(followUps);
    }

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

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

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

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

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

    [Fact]
    public async Task UpdateFollowUp_WithValidParams_ShouldCallHttpPut() {
        PCRBFollowUp followUp = new PCRBFollowUp {
            ID = 1,
            PlanNumber = 123,
            Step = 1,
            FollowUpDate = DateTime.Now,
            Comments = "Test"
        };

        var mockHttpMessageHandler = new Mock<HttpMessageHandler>();

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

        var httpClient = new HttpClient(mockHttpMessageHandler.Object) {
            BaseAddress = new Uri("https://localhost:5000")
        };
        _mockHttpClientFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);

        await _pcrbService.UpdateFollowUp(followUp);

        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/followUp")),
            ItExpr.IsAny<CancellationToken>());
    }

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

    [Fact]
    public async Task UpdateFollowUp_WithBadResponse_ShouldThrowException() {
        PCRBFollowUp followUp = new PCRBFollowUp {
            ID = 1,
            PlanNumber = 123,
            Step = 1,
            FollowUpDate = DateTime.Now,
            Comments = "Test"
        };

        var mockHttpMessageHandler = new Mock<HttpMessageHandler>();

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

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

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

        await Assert.ThrowsAsync<Exception>(() => _pcrbService.UpdateFollowUp(followUp));
    }

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

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

        var httpClient = new HttpClient(mockHttpMessageHandler.Object) {
            BaseAddress = new Uri("https://localhost:5000")
        };
        _mockHttpClientFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);

        await _pcrbService.DeleteFollowUp(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/followUp?id=1")),
            ItExpr.IsAny<CancellationToken>());
    }

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

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

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

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

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

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