using ChatBot.Data;
using ChatBot.Data.Interfaces;
using ChatBot.Data.Repositories;
using ChatBot.Models;
using ChatBot.Models.Entities;
using ChatBot.Services;
using ChatBot.Tests.TestUtilities;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Moq;

namespace ChatBot.Tests.Services;

public class DatabaseSessionStorageTests : TestBase
{
    private ChatBotDbContext _dbContext = null!;
    private DatabaseSessionStorage _sessionStorage = null!;
    private Mock<IChatSessionRepository> _repositoryMock = null!;

    public DatabaseSessionStorageTests()
    {
        SetupServices();
    }

    protected override void ConfigureServices(IServiceCollection services)
    {
        // Add in-memory database
        services.AddDbContext<ChatBotDbContext>(options =>
            options.UseInMemoryDatabase("TestDatabase")
        );

        // Add mocked repository
        _repositoryMock = new Mock<IChatSessionRepository>();
        services.AddSingleton(_repositoryMock.Object);

        // Add logger
        services.AddSingleton(Mock.Of<ILogger<DatabaseSessionStorage>>());

        // Add session storage
        services.AddScoped<DatabaseSessionStorage>();
    }

    protected override void SetupServices()
    {
        base.SetupServices();

        _dbContext = ServiceProvider.GetRequiredService<ChatBotDbContext>();
        _sessionStorage = ServiceProvider.GetRequiredService<DatabaseSessionStorage>();

        // Ensure database is created
        _dbContext.Database.EnsureCreated();
    }

    [Fact]
    public void GetOrCreate_ShouldReturnExistingSession_WhenSessionExists()
    {
        // Arrange
        var existingSession = TestDataBuilder.Mocks.CreateChatSessionEntity();
        _repositoryMock
            .Setup(x => x.GetOrCreateAsync(12345, "private", "Test Chat"))
            .ReturnsAsync(existingSession);

        // Act
        var result = _sessionStorage.GetOrCreate(12345, "private", "Test Chat");

        // Assert
        result.Should().NotBeNull();
        result.ChatId.Should().Be(12345);
        _repositoryMock.Verify(x => x.GetOrCreateAsync(12345, "private", "Test Chat"), Times.Once);
    }

    [Fact]
    public void Get_ShouldReturnSession_WhenSessionExists()
    {
        // Arrange
        var sessionEntity = TestDataBuilder.Mocks.CreateChatSessionEntity();
        _repositoryMock.Setup(x => x.GetByChatIdAsync(12345)).ReturnsAsync(sessionEntity);

        // Act
        var result = _sessionStorage.Get(12345);

        // Assert
        result.Should().NotBeNull();
        result.ChatId.Should().Be(12345);
        _repositoryMock.Verify(x => x.GetByChatIdAsync(12345), Times.Once);
    }

    [Fact]
    public void Get_ShouldReturnNull_WhenSessionDoesNotExist()
    {
        // Arrange
        _repositoryMock
            .Setup(x => x.GetByChatIdAsync(12345))
            .ReturnsAsync((ChatSessionEntity?)null);

        // Act
        var result = _sessionStorage.Get(12345);

        // Assert
        result.Should().BeNull();
        _repositoryMock.Verify(x => x.GetByChatIdAsync(12345), Times.Once);
    }

    [Fact]
    public async Task SaveSessionAsync_ShouldUpdateSession_WhenSessionExists()
    {
        // Arrange
        var session = TestDataBuilder.ChatSessions.CreateBasicSession(12345, "private");
        var sessionEntity = TestDataBuilder.Mocks.CreateChatSessionEntity();
        _repositoryMock.Setup(x => x.GetByChatIdAsync(12345)).ReturnsAsync(sessionEntity);
        _repositoryMock
            .Setup(x => x.UpdateAsync(It.IsAny<ChatSessionEntity>()))
            .ReturnsAsync(sessionEntity);

        // Act
        await _sessionStorage.SaveSessionAsync(session);

        // Assert
        _repositoryMock.Verify(x => x.UpdateAsync(It.IsAny<ChatSessionEntity>()), Times.Once);
    }

    [Fact]
    public void Remove_ShouldReturnTrue_WhenSessionExists()
    {
        // Arrange
        _repositoryMock.Setup(x => x.DeleteAsync(12345)).ReturnsAsync(true);

        // Act
        var result = _sessionStorage.Remove(12345);

        // Assert
        result.Should().BeTrue();
        _repositoryMock.Verify(x => x.DeleteAsync(12345), Times.Once);
    }

    [Fact]
    public void Remove_ShouldReturnFalse_WhenSessionDoesNotExist()
    {
        // Arrange
        _repositoryMock.Setup(x => x.DeleteAsync(12345)).ReturnsAsync(false);

        // Act
        var result = _sessionStorage.Remove(12345);

        // Assert
        result.Should().BeFalse();
        _repositoryMock.Verify(x => x.DeleteAsync(12345), Times.Once);
    }

    [Fact]
    public void GetActiveSessionsCount_ShouldReturnCorrectCount()
    {
        // Arrange
        var expectedCount = 5;
        _repositoryMock.Setup(x => x.GetActiveSessionsCountAsync()).ReturnsAsync(expectedCount);

        // Act
        var result = _sessionStorage.GetActiveSessionsCount();

        // Assert
        result.Should().Be(expectedCount);
        _repositoryMock.Verify(x => x.GetActiveSessionsCountAsync(), Times.Once);
    }

    [Fact]
    public void CleanupOldSessions_ShouldReturnCorrectCount()
    {
        // Arrange
        var expectedCount = 3;
        _repositoryMock.Setup(x => x.CleanupOldSessionsAsync(24)).ReturnsAsync(expectedCount);

        // Act
        var result = _sessionStorage.CleanupOldSessions(24);

        // Assert
        result.Should().Be(expectedCount);
        _repositoryMock.Verify(x => x.CleanupOldSessionsAsync(24), Times.Once);
    }
}