using Xunit;
using Moq;
using FluentAssertions;
using Haoliang.Core.Services;
using Haoliang.Models.Template;
using Haoliang.Data.Repositories;

namespace Haoliang.Tests;

public class TemplateServiceTests
{
    private readonly Mock<ITemplateRepository> _mockTemplateRepository;
    private readonly TemplateService _templateService;

    public TemplateServiceTests()
    {
        _mockTemplateRepository = new Mock<ITemplateRepository>();
        _templateService = new TemplateService(_mockTemplateRepository.Object);
    }

    [Fact]
    public async Task GetAllTemplatesAsync_ReturnsTemplatesFromRepository()
    {
        var templates = new List<CNCBrandTemplate>
        {
            new CNCBrandTemplate { Id = 1, BrandName = "Fanuc", Description = "Fanuc CNC" },
            new CNCBrandTemplate { Id = 2, BrandName = "Mitsubishi", Description = "Mitsubishi CNC" }
        };
        _mockTemplateRepository.Setup(r => r.GetAllAsync()).ReturnsAsync(templates);

        var result = await _templateService.GetAllTemplatesAsync();

        result.Should().HaveCount(2);
        result.Should().BeEquivalentTo(templates);
    }

    [Fact]
    public async Task GetTemplateByIdAsync_ReturnsTemplate_WhenExists()
    {
        var template = new CNCBrandTemplate { Id = 1, BrandName = "Fanuc", Description = "Fanuc CNC" };
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(1)).ReturnsAsync(template);

        var result = await _templateService.GetTemplateByIdAsync(1);

        result.Should().NotBeNull();
        result!.BrandName.Should().Be("Fanuc");
    }

    [Fact]
    public async Task GetTemplateByIdAsync_ReturnsNull_WhenNotExists()
    {
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(999)).ReturnsAsync((CNCBrandTemplate?)null);

        var result = await _templateService.GetTemplateByIdAsync(999);

        result.Should().BeNull();
    }

    [Fact]
    public async Task CreateTemplateAsync_SetsCreatedAtUpdatedAtAndIsEnabled()
    {
        var template = new CNCBrandTemplate { BrandName = "NewBrand", Description = "New CNC" };
        _mockTemplateRepository.Setup(r => r.AddAsync(It.IsAny<CNCBrandTemplate>())).Returns(Task.CompletedTask);
        _mockTemplateRepository.Setup(r => r.SaveAsync()).ReturnsAsync(1);

        var beforeCreate = DateTime.Now;
        var result = await _templateService.CreateTemplateAsync(template);
        var afterCreate = DateTime.Now;

        result.CreatedAt.Should().BeOnOrAfter(beforeCreate);
        result.CreatedAt.Should().BeOnOrBefore(afterCreate);
        result.UpdatedAt.Should().BeOnOrAfter(beforeCreate);
        result.UpdatedAt.Should().BeOnOrBefore(afterCreate);
        result.IsEnabled.Should().BeTrue();
    }

    [Fact]
    public async Task UpdateTemplateAsync_UpdatesTemplate_WhenExists()
    {
        var existing = new CNCBrandTemplate { Id = 1, BrandName = "Original", Description = "Original Desc" };
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(1)).ReturnsAsync(existing);
        _mockTemplateRepository.Setup(r => r.Update(It.IsAny<CNCBrandTemplate>())).Verifiable();
        _mockTemplateRepository.Setup(r => r.SaveAsync()).ReturnsAsync(1);

        var updated = await _templateService.UpdateTemplateAsync(1, new CNCBrandTemplate
        {
            BrandName = "Updated",
            Description = "Updated Desc"
        });

        updated.Should().NotBeNull();
        updated!.BrandName.Should().Be("Updated");
        updated.Description.Should().Be("Updated Desc");
    }

    [Fact]
    public async Task UpdateTemplateAsync_ReturnsNull_WhenNotExists()
    {
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(999)).ReturnsAsync((CNCBrandTemplate?)null);

        var result = await _templateService.UpdateTemplateAsync(999, new CNCBrandTemplate());

        result.Should().BeNull();
    }

    [Fact]
    public async Task DeleteTemplateAsync_ReturnsTrue_WhenTemplateExists()
    {
        var template = new CNCBrandTemplate { Id = 1 };
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(1)).ReturnsAsync(template);
        _mockTemplateRepository.Setup(r => r.Remove(template)).Verifiable();
        _mockTemplateRepository.Setup(r => r.SaveAsync()).ReturnsAsync(1);

        var result = await _templateService.DeleteTemplateAsync(1);

        result.Should().BeTrue();
    }

    [Fact]
    public async Task DeleteTemplateAsync_ReturnsFalse_WhenTemplateNotExists()
    {
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(999)).ReturnsAsync((CNCBrandTemplate?)null);

        var result = await _templateService.DeleteTemplateAsync(999);

        result.Should().BeFalse();
    }

    [Fact]
    public async Task EnableTemplateAsync_CallsUpdateTemplateEnabled()
    {
        _mockTemplateRepository.Setup(r => r.UpdateTemplateEnabledAsync(1, true)).Returns(Task.CompletedTask);

        var result = await _templateService.EnableTemplateAsync(1);

        result.Should().BeTrue();
        _mockTemplateRepository.Verify(r => r.UpdateTemplateEnabledAsync(1, true), Times.Once);
    }

    [Fact]
    public async Task DisableTemplateAsync_CallsUpdateTemplateEnabled()
    {
        _mockTemplateRepository.Setup(r => r.UpdateTemplateEnabledAsync(1, false)).Returns(Task.CompletedTask);

        var result = await _templateService.DisableTemplateAsync(1);

        result.Should().BeTrue();
        _mockTemplateRepository.Verify(r => r.UpdateTemplateEnabledAsync(1, false), Times.Once);
    }

    [Fact]
    public async Task CloneTemplateAsync_CreatesCopyWithNewName()
    {
        var original = new CNCBrandTemplate
        {
            Id = 1,
            BrandName = "Original",
            Description = "Original Description",
            FieldMappings = new List<TemplateFieldMapping>
            {
                new TemplateFieldMapping { SourceFieldPath = "tag1", StandardFieldId = "Status" }
            }
        };
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(1)).ReturnsAsync(original);
        _mockTemplateRepository.Setup(r => r.AddAsync(It.IsAny<CNCBrandTemplate>())).Returns(Task.CompletedTask);
        _mockTemplateRepository.Setup(r => r.SaveAsync()).ReturnsAsync(1);

        var result = await _templateService.CloneTemplateAsync(1, "ClonedTemplate");

        result.Should().NotBeNull();
        result!.BrandName.Should().Be("ClonedTemplate");
        result.Description.Should().Be("Original Description (Cloned)");
        result.FieldMappings.Should().HaveCount(1);
        result.IsEnabled.Should().BeFalse();
    }

    [Fact]
    public async Task CloneTemplateAsync_ReturnsNull_WhenOriginalNotExists()
    {
        _mockTemplateRepository.Setup(r => r.GetByIdAsync(999)).ReturnsAsync((CNCBrandTemplate?)null);

        var result = await _templateService.CloneTemplateAsync(999, "NewName");

        result.Should().BeNull();
    }

    [Fact]
    public async Task GetTemplatesByBrandAsync_ReturnsMatchingTemplates()
    {
        var templates = new List<CNCBrandTemplate>
        {
            new CNCBrandTemplate { Id = 1, BrandName = "Fanuc" }
        };
        _mockTemplateRepository.Setup(r => r.FindAsync(t => t.BrandName == "Fanuc")).ReturnsAsync(templates);

        var result = await _templateService.GetTemplatesByBrandAsync("Fanuc");

        result.Should().HaveCount(1);
    }

    [Fact]
    public async Task GetActiveTemplatesAsync_ReturnsEnabledTemplates()
    {
        var activeTemplates = new List<CNCBrandTemplate>
        {
            new CNCBrandTemplate { Id = 1, BrandName = "Fanuc", IsEnabled = true }
        };
        _mockTemplateRepository.Setup(r => r.GetEnabledTemplatesAsync()).ReturnsAsync(activeTemplates);

        var result = await _templateService.GetActiveTemplatesAsync();

        result.Should().HaveCount(1);
    }

    [Fact]
    public async Task ValidateTemplateAsync_ReturnsTrue()
    {
        var template = new CNCBrandTemplate { BrandName = "Test", Description = "Test" };

        var result = await _templateService.ValidateTemplateAsync(template);

        result.Should().BeTrue();
    }

    [Fact]
    public async Task TestTemplateAsync_Completes()
    {
        await _templateService.TestTemplateAsync(1);
    }
}