using System.Net;
using System.Text.Json;
using JdeScoping.Client.Models;
using JdeScoping.Client.Services;
using JdeScoping.Core.ApiContracts;
using JdeScoping.Core.ViewModels;
using RichardSzalay.MockHttp;
using Shouldly;

namespace JdeScoping.Client.Tests.Services;

public class FileApiClientTests
{
    private readonly MockHttpMessageHandler _mockHttp;
    private readonly FileApiClient _client;
    private readonly JsonSerializerOptions _jsonOptions = new() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase };

    public FileApiClientTests()
    {
        _mockHttp = new MockHttpMessageHandler();
        var httpClient = new HttpClient(_mockHttp) { BaseAddress = new Uri("http://localhost/") };
        _client = new FileApiClient(httpClient);
    }

    // Route verification tests - Downloads

    [Fact]
    public async Task DownloadWorkOrdersTemplateAsync_CallsCorrectRoute_WithPostMethod()
    {
        // Arrange
        var request = _mockHttp.Expect(HttpMethod.Post, $"http://localhost/{ApiRoutes.FileIO.DownloadWorkOrders}")
            .Respond("application/octet-stream", new MemoryStream(new byte[] { 1, 2, 3 }));

        // Act
        await _client.DownloadWorkOrdersTemplateAsync();

        // Assert
        _mockHttp.GetMatchCount(request).ShouldBe(1);
    }

    [Fact]
    public async Task DownloadItemsTemplateAsync_CallsCorrectRoute()
    {
        // Arrange
        var request = _mockHttp.Expect(HttpMethod.Post, $"http://localhost/{ApiRoutes.FileIO.DownloadItems}")
            .Respond("application/octet-stream", new MemoryStream(new byte[] { 1, 2, 3 }));

        // Act
        await _client.DownloadItemsTemplateAsync();

        // Assert
        _mockHttp.GetMatchCount(request).ShouldBe(1);
    }

    [Fact]
    public async Task DownloadComponentLotsTemplateAsync_CallsCorrectRoute()
    {
        // Arrange
        var request = _mockHttp.Expect(HttpMethod.Post, $"http://localhost/{ApiRoutes.FileIO.DownloadComponentLots}")
            .Respond("application/octet-stream", new MemoryStream(new byte[] { 1, 2, 3 }));

        // Act
        await _client.DownloadComponentLotsTemplateAsync();

        // Assert
        _mockHttp.GetMatchCount(request).ShouldBe(1);
    }

    [Fact]
    public async Task DownloadPartOperationsTemplateAsync_CallsCorrectRoute()
    {
        // Arrange
        var request = _mockHttp.Expect(HttpMethod.Post, $"http://localhost/{ApiRoutes.FileIO.DownloadPartOperations}")
            .Respond("application/octet-stream", new MemoryStream(new byte[] { 1, 2, 3 }));

        // Act
        await _client.DownloadPartOperationsTemplateAsync();

        // Assert
        _mockHttp.GetMatchCount(request).ShouldBe(1);
    }

    // Route verification tests - Uploads

    [Fact]
    public async Task UploadWorkOrdersAsync_CallsCorrectRoute_WithPostMethod()
    {
        // Arrange
        var response = new FileUploadResult<WorkOrderViewModel> { WasSuccessful = true, Data = Array.Empty<WorkOrderViewModel>() };
        var request = _mockHttp.Expect(HttpMethod.Post, $"http://localhost/{ApiRoutes.FileIO.UploadWorkOrders}")
            .Respond("application/json", JsonSerializer.Serialize(response, _jsonOptions));

        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        // Act
        await _client.UploadWorkOrdersAsync(stream, "test.xlsx");

        // Assert
        _mockHttp.GetMatchCount(request).ShouldBe(1);
    }

    [Fact]
    public async Task UploadItemsAsync_CallsCorrectRoute()
    {
        // Arrange
        var response = new FileUploadResult<ItemViewModel> { WasSuccessful = true, Data = Array.Empty<ItemViewModel>() };
        var request = _mockHttp.Expect(HttpMethod.Post, $"http://localhost/{ApiRoutes.FileIO.UploadItems}")
            .Respond("application/json", JsonSerializer.Serialize(response, _jsonOptions));

        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        // Act
        await _client.UploadItemsAsync(stream, "test.xlsx");

        // Assert
        _mockHttp.GetMatchCount(request).ShouldBe(1);
    }

    // Success tests - Downloads

    [Fact]
    public async Task DownloadWorkOrdersTemplateAsync_Success_ReturnsBytes()
    {
        // Arrange
        var expectedBytes = new byte[] { 0x50, 0x4B, 0x03, 0x04 }; // ZIP header
        _mockHttp.When(HttpMethod.Post, "*")
            .Respond("application/octet-stream", new MemoryStream(expectedBytes));

        // Act
        var result = await _client.DownloadWorkOrdersTemplateAsync();

        // Assert
        result.IsSuccess.ShouldBeTrue();
        result.Value.ShouldBe(expectedBytes);
    }

    [Fact]
    public async Task DownloadWorkOrdersTemplateAsync_WithExistingData_SendsData()
    {
        // Arrange
        var existingData = new List<WorkOrderViewModel>
        {
            new() { WorkOrderNumber = 12345 }
        };

        _mockHttp.When(HttpMethod.Post, "*")
            .With(req => req.Content != null) // Verify body is sent
            .Respond("application/octet-stream", new MemoryStream(new byte[] { 1, 2, 3 }));

        // Act
        var result = await _client.DownloadWorkOrdersTemplateAsync(existingData);

        // Assert
        result.IsSuccess.ShouldBeTrue();
    }

    // Success tests - Uploads

    [Fact]
    public async Task UploadWorkOrdersAsync_Success_ReturnsWorkOrderList()
    {
        // Arrange
        var workOrders = new[]
        {
            new WorkOrderViewModel { WorkOrderNumber = 12345, ItemNumber = "ITEM001" }
        };
        var response = new FileUploadResult<WorkOrderViewModel> { WasSuccessful = true, Data = workOrders };
        _mockHttp.When(HttpMethod.Post, "*")
            .Respond("application/json", JsonSerializer.Serialize(response, _jsonOptions));

        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        // Act
        var result = await _client.UploadWorkOrdersAsync(stream, "test.xlsx");

        // Assert
        result.IsSuccess.ShouldBeTrue();
        result.Value.Count.ShouldBe(1);
        result.Value[0].WorkOrderNumber.ShouldBe(12345);
    }

    [Fact]
    public async Task UploadItemsAsync_Success_ReturnsItemList()
    {
        // Arrange
        var items = new[]
        {
            new ItemViewModel { ItemNumber = "ITEM1", Description = "Test Item" }
        };
        var response = new FileUploadResult<ItemViewModel> { WasSuccessful = true, Data = items };
        _mockHttp.When(HttpMethod.Post, "*")
            .Respond("application/json", JsonSerializer.Serialize(response, _jsonOptions));

        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        // Act
        var result = await _client.UploadItemsAsync(stream, "test.xlsx");

        // Assert
        result.IsSuccess.ShouldBeTrue();
        result.Value.Count.ShouldBe(1);
    }

    // Error tests

    [Fact]
    public async Task DownloadWorkOrdersTemplateAsync_404_ReturnsNotFound()
    {
        // Arrange
        _mockHttp.When(HttpMethod.Post, "*")
            .Respond(HttpStatusCode.NotFound);

        // Act
        var result = await _client.DownloadWorkOrdersTemplateAsync();

        // Assert
        result.IsNotFound.ShouldBeTrue();
    }

    [Fact]
    public async Task UploadWorkOrdersAsync_VerifiesMultipartContentType_AndFilename()
    {
        // Arrange - verify multipart structure and filename
        var response = new FileUploadResult<WorkOrderViewModel> { WasSuccessful = true, Data = Array.Empty<WorkOrderViewModel>() };
        _mockHttp.When(HttpMethod.Post, "*")
            .With(req =>
            {
                var content = req.Content as MultipartFormDataContent;
                if (content == null) return false;

                // Check content type is multipart/form-data
                var contentType = req.Content?.Headers.ContentType?.MediaType;
                if (contentType != "multipart/form-data") return false;

                // Check that filename is passed correctly
                var contentDisposition = content.First().Headers.ContentDisposition;
                return contentDisposition?.FileName?.Contains("test.xlsx") == true;
            })
            .Respond("application/json", JsonSerializer.Serialize(response, _jsonOptions));

        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        // Act
        var result = await _client.UploadWorkOrdersAsync(stream, "test.xlsx");

        // Assert
        result.IsSuccess.ShouldBeTrue();
    }

    [Fact]
    public async Task UploadWorkOrdersAsync_400_ReturnsValidationError()
    {
        // Arrange - use actual ValidationProblemDetails structure
        var validationProblem = new Microsoft.AspNetCore.Mvc.ValidationProblemDetails
        {
            Errors = { ["File"] = new[] { "Invalid file format" } }
        };
        _mockHttp.When(HttpMethod.Post, "*")
            .Respond(HttpStatusCode.BadRequest, "application/json",
                JsonSerializer.Serialize(validationProblem, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase }));

        using var stream = new MemoryStream(new byte[] { 1, 2, 3 });

        // Act
        var result = await _client.UploadWorkOrdersAsync(stream, "test.xlsx");

        // Assert
        result.IsValidationError.ShouldBeTrue();
    }
}