using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using RobotNet10.FleetManager.Data;
using RobotNet10.FleetManager.Services;
using RobotNet10.FleetManager.Shared.DTOs.RobotModel;
using RobotNet10.FleetManager.Shared.Enums;
using RobotNet10.RobotManager.Test.Helpers;

namespace RobotNet10.RobotManager.Test.Services;

/// <summary>
/// Unit tests for RobotModelService
/// </summary>
[TestFixture]
public class RobotModelServiceTests
{
    private ApplicationDbContext _context = null!;
    private RobotModelService _service = null!;

    [SetUp]
    public void Setup()
    {
        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
            .Options;

        _context = new ApplicationDbContext(options);
        var logger = new LoggerFactory().CreateLogger<RobotModelService>();
        var _logger = new FleetManager.Services.Logger<RobotModelService>(logger);
        _service = new RobotModelService(_context, _logger);
    }

    [TearDown]
    public void TearDown()
    {
        _context.Dispose();
    }

    [Test]
    public async Task CreateAsync_ValidData_ReturnsCreatedRobotModel()
    {
        // Arrange
        var request = new CreateRobotModelRequest
        {
            ModelName = "TestModel",
            Length = 1.2,
            Width = 0.8,
            ImageWidth = 800,
            ImageHeight = 600,
            NavigationPointX = 0.0,
            NavigationPointY = 0.0,
            NavigationType = NavigationType.Differential
        };

        // Act
        var result = await _service.CreateAsync(request);

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result.ModelName, Is.EqualTo(request.ModelName));
        Assert.That(result.Length, Is.EqualTo(request.Length));
        Assert.That(result.Width, Is.EqualTo(request.Width));
        Assert.That(result.NavigationType, Is.EqualTo(request.NavigationType));
        Assert.That(result.Id, Is.Not.EqualTo(Guid.Empty));
    }

    [Test]
    public async Task CreateAsync_DuplicateModelName_ThrowsInvalidOperationException()
    {
        // Arrange
        var existingModel = TestHelpers.CreateTestRobotModel(modelName: "ExistingModel");
        _context.RobotModels.Add(existingModel);
        await _context.SaveChangesAsync();

        var request = new CreateRobotModelRequest
        {
            ModelName = "ExistingModel",
            Length = 1.0,
            Width = 0.5,
            ImageWidth = 800,
            ImageHeight = 600,
            NavigationPointX = 0.0,
            NavigationPointY = 0.0,
            NavigationType = NavigationType.Differential
        };

        // Act & Assert
        var ex = Assert.ThrowsAsync<InvalidOperationException>(async () => await _service.CreateAsync(request));
        Assert.That(ex!.Message, Does.Contain("already exists"));
    }

    [Test]
    public async Task GetAllAsync_ReturnsAllRobotModels()
    {
        // Arrange
        TestHelpers.SeedTestData(_context);

        // Act
        var result = await _service.GetAllAsync();

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result.Count, Is.EqualTo(2));
    }

    [Test]
    public async Task GetByIdAsync_ExistingId_ReturnsRobotModel()
    {
        // Arrange
        var model = TestHelpers.CreateTestRobotModel();
        _context.RobotModels.Add(model);
        await _context.SaveChangesAsync();

        // Act
        var result = await _service.GetByIdAsync(model.Id);

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result!.Id, Is.EqualTo(model.Id));
        Assert.That(result.ModelName, Is.EqualTo(model.ModelName));
    }

    [Test]
    public async Task GetByIdAsync_NonExistentId_ReturnsNull()
    {
        // Arrange
        var nonExistentId = Guid.NewGuid();

        // Act
        var result = await _service.GetByIdAsync(nonExistentId);

        // Assert
        Assert.That(result, Is.Null);
    }

    [Test]
    public async Task UpdateAsync_ValidData_UpdatesRobotModel()
    {
        // Arrange
        var model = TestHelpers.CreateTestRobotModel();
        _context.RobotModels.Add(model);
        await _context.SaveChangesAsync();

        var request = new UpdateRobotModelRequest
        {
            ModelName = "UpdatedModel",
            Length = 2.0,
            Width = 1.0,
            ImageWidth = 1000,
            ImageHeight = 800,
            NavigationPointX = 0.1,
            NavigationPointY = 0.2,
            NavigationType = NavigationType.OmniDrive
        };

        // Act
        var result = await _service.UpdateAsync(model.Id, request);

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result.ModelName, Is.EqualTo(request.ModelName));
        Assert.That(result.Length, Is.EqualTo(request.Length));
        Assert.That(result.NavigationType, Is.EqualTo(request.NavigationType));
    }

    [Test]
    public async Task UpdateAsync_NonExistentId_ThrowsKeyNotFoundException()
    {
        // Arrange
        var nonExistentId = Guid.NewGuid();
        var request = new UpdateRobotModelRequest
        {
            ModelName = "Test",
            Length = 1.0,
            Width = 0.5,
            ImageWidth = 800,
            ImageHeight = 600,
            NavigationPointX = 0.0,
            NavigationPointY = 0.0,
            NavigationType = NavigationType.Differential
        };

        // Act & Assert
        Assert.ThrowsAsync<KeyNotFoundException>(async () => await _service.UpdateAsync(nonExistentId, request));
    }

    [Test]
    public async Task DeleteAsync_ExistingId_ReturnsTrue()
    {
        // Arrange
        var model = TestHelpers.CreateTestRobotModel();
        _context.RobotModels.Add(model);
        await _context.SaveChangesAsync();

        // Act
        var result = await _service.DeleteAsync(model.Id);

        // Assert
        Assert.That(result, Is.True);
        var deleted = await _context.RobotModels.FindAsync(model.Id);
        Assert.That(deleted, Is.Null);
    }

    [Test]
    public async Task DeleteAsync_NonExistentId_ReturnsFalse()
    {
        // Arrange
        var nonExistentId = Guid.NewGuid();

        // Act
        var result = await _service.DeleteAsync(nonExistentId);

        // Assert
        Assert.That(result, Is.False);
    }

    [Test]
    public async Task DeleteAsync_ModelWithRobots_ThrowsInvalidOperationException()
    {
        // Arrange
        var model = TestHelpers.CreateTestRobotModel();
        _context.RobotModels.Add(model);
        
        var robot = TestHelpers.CreateTestRobot(modelId: model.Id);
        _context.Robots.Add(robot);
        await _context.SaveChangesAsync();

        // Act & Assert
        var ex = Assert.ThrowsAsync<InvalidOperationException>(async () => await _service.DeleteAsync(model.Id));
        Assert.That(ex, Is.Not.Null);
        Assert.That(ex!.Message, Does.Contain("Cannot delete").Or.Contain("cannot be deleted").Or.Contain("being used"));
    }

    [Test]
    public async Task SearchAsync_WithQuery_ReturnsMatchingModels()
    {
        // Arrange
        TestHelpers.SeedTestData(_context);

        // Act
        var result = await _service.SearchAsync("AMR-T800");

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result.Count, Is.EqualTo(1));
        Assert.That(result[0].ModelName, Is.EqualTo("AMR-T800"));
    }

    [Test]
    public async Task SearchAsync_EmptyQuery_ReturnsAllModels()
    {
        // Arrange
        TestHelpers.SeedTestData(_context);

        // Act
        var result = await _service.SearchAsync("");

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result.Count, Is.EqualTo(2));
    }

    [Test]
    public async Task ExistsAsync_ExistingModelName_ReturnsTrue()
    {
        // Arrange
        var model = TestHelpers.CreateTestRobotModel(modelName: "ExistingModel");
        _context.RobotModels.Add(model);
        await _context.SaveChangesAsync();

        // Act
        var result = await _service.ExistsAsync("ExistingModel");

        // Assert
        Assert.That(result, Is.True);
    }

    [Test]
    public async Task ExistsAsync_NonExistentModelName_ReturnsFalse()
    {
        // Arrange
        // No models in database

        // Act
        var result = await _service.ExistsAsync("NonExistentModel");

        // Assert
        Assert.That(result, Is.False);
    }

    [Test]
    public async Task GetUsageInfoAsync_ModelWithRobots_ReturnsUsageInfo()
    {
        // Arrange
        var model = TestHelpers.CreateTestRobotModel();
        _context.RobotModels.Add(model);
        
        var robot1 = TestHelpers.CreateTestRobot(modelId: model.Id);
        var robot2 = TestHelpers.CreateTestRobot(robotId: "ROBOT-002", modelId: model.Id);
        _context.Robots.AddRange(robot1, robot2);
        await _context.SaveChangesAsync();

        // Act
        var result = await _service.GetUsageInfoAsync(model.Id);

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result.RobotCount, Is.EqualTo(2));
        Assert.That(result.CanDelete, Is.False);
    }

    [Test]
    public async Task GetUsageInfoAsync_ModelWithoutRobots_ReturnsZeroCount()
    {
        // Arrange
        var model = TestHelpers.CreateTestRobotModel();
        _context.RobotModels.Add(model);
        await _context.SaveChangesAsync();

        // Act
        var result = await _service.GetUsageInfoAsync(model.Id);

        // Assert
        Assert.That(result, Is.Not.Null);
        Assert.That(result.RobotCount, Is.EqualTo(0));
        Assert.That(result.CanDelete, Is.True);
    }
}