using ChatBot.Tests.TestUtilities;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Moq;

namespace ChatBot.Tests.Integration;

public class ProgramIntegrationTests : TestBase
{
    protected override void ConfigureServices(IServiceCollection services)
    {
        // Add configuration
        var configuration = new ConfigurationBuilder()
            .AddInMemoryCollection(
                new Dictionary<string, string?>
                {
                    ["TelegramBot:BotToken"] = "test_token",
                    ["Ollama:Url"] = "http://localhost:11434",
                    ["Ollama:DefaultModel"] = "llama2",
                    ["AI:MaxTokens"] = "1000",
                    ["AI:Temperature"] = "0.7",
                    ["Database:ConnectionString"] =
                        "Host=localhost;Port=5432;Database=test_chatbot;Username=postgres;Password=postgres",
                    ["Database:CommandTimeout"] = "30",
                    ["Database:EnableSensitiveDataLogging"] = "false",
                }
            )
            .Build();

        services.AddSingleton<IConfiguration>(configuration);
        services.AddLogging(builder => builder.AddConsole().SetMinimumLevel(LogLevel.Debug));
    }

    [Fact]
    public void Program_ShouldHaveRequiredUsingStatements()
    {
        // This test verifies that Program.cs has the necessary using statements
        // by checking if the types can be resolved
        var services = new ServiceCollection();
        ConfigureServices(services);
        var serviceProvider = services.BuildServiceProvider();

        // Verify that key services can be resolved
        Assert.NotNull(serviceProvider.GetService<IConfiguration>());
        Assert.NotNull(serviceProvider.GetService<ILoggerFactory>());
    }

    [Fact]
    public void Program_ShouldConfigureTelegramBotSettings()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();

        // Assert
        var botToken = serviceProvider.GetRequiredService<IConfiguration>()["TelegramBot:BotToken"];
        Assert.Equal("test_token", botToken);
    }

    [Fact]
    public void Program_ShouldConfigureOllamaSettings()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert
        var ollamaUrl = configuration["Ollama:Url"];
        var defaultModel = configuration["Ollama:DefaultModel"];
        Assert.Equal("http://localhost:11434", ollamaUrl);
        Assert.Equal("llama2", defaultModel);
    }

    [Fact]
    public void Program_ShouldConfigureAISettings()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert
        var maxTokens = configuration["AI:MaxTokens"];
        var temperature = configuration["AI:Temperature"];
        Assert.Equal("1000", maxTokens);
        Assert.Equal("0.7", temperature);
    }

    [Fact]
    public void Program_ShouldConfigureDatabaseSettings()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert
        var connectionString = configuration["Database:ConnectionString"];
        var commandTimeout = configuration["Database:CommandTimeout"];

        Assert.Equal(
            "Host=localhost;Port=5432;Database=test_chatbot;Username=postgres;Password=postgres",
            connectionString
        );
        Assert.Equal("30", commandTimeout);
        Assert.Equal("false", configuration["Database:EnableSensitiveDataLogging"]);
    }

    [Fact]
    public void Program_ShouldHandleEnvironmentVariables()
    {
        // Arrange
        Environment.SetEnvironmentVariable("TELEGRAM_BOT_TOKEN", "env_token");
        Environment.SetEnvironmentVariable("OLLAMA_URL", "http://env:11434");
        Environment.SetEnvironmentVariable("OLLAMA_DEFAULT_MODEL", "env_model");
        Environment.SetEnvironmentVariable("DB_HOST", "env_host");
        Environment.SetEnvironmentVariable("DB_PORT", "8080");
        Environment.SetEnvironmentVariable("DB_NAME", "env_db");
        Environment.SetEnvironmentVariable("DB_USER", "env_user");
        Environment.SetEnvironmentVariable("DB_PASSWORD", "env_pass");

        try
        {
            // Act
            var services = new ServiceCollection();
            ConfigureServices(services);

            // Assert
            Assert.Equal("env_token", Environment.GetEnvironmentVariable("TELEGRAM_BOT_TOKEN"));
            Assert.Equal("http://env:11434", Environment.GetEnvironmentVariable("OLLAMA_URL"));
            Assert.Equal("env_model", Environment.GetEnvironmentVariable("OLLAMA_DEFAULT_MODEL"));
            Assert.Equal("env_host", Environment.GetEnvironmentVariable("DB_HOST"));
            Assert.Equal("8080", Environment.GetEnvironmentVariable("DB_PORT"));
            Assert.Equal("env_db", Environment.GetEnvironmentVariable("DB_NAME"));
            Assert.Equal("env_user", Environment.GetEnvironmentVariable("DB_USER"));
            Assert.Equal("env_pass", Environment.GetEnvironmentVariable("DB_PASSWORD"));
        }
        finally
        {
            // Cleanup
            Environment.SetEnvironmentVariable("TELEGRAM_BOT_TOKEN", null);
            Environment.SetEnvironmentVariable("OLLAMA_URL", null);
            Environment.SetEnvironmentVariable("OLLAMA_DEFAULT_MODEL", null);
            Environment.SetEnvironmentVariable("DB_HOST", null);
            Environment.SetEnvironmentVariable("DB_PORT", null);
            Environment.SetEnvironmentVariable("DB_NAME", null);
            Environment.SetEnvironmentVariable("DB_USER", null);
            Environment.SetEnvironmentVariable("DB_PASSWORD", null);
        }
    }

    [Fact]
    public void Program_ShouldHaveValidConfigurationStructure()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert - Check that all required configuration sections exist
        Assert.NotNull(configuration.GetSection("TelegramBot"));
        Assert.NotNull(configuration.GetSection("Ollama"));
        Assert.NotNull(configuration.GetSection("AI"));
        Assert.NotNull(configuration.GetSection("Database"));
    }

    [Fact]
    public void Program_ShouldHaveRequiredConfigurationValues()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert - Check that all required configuration values are present
        Assert.NotNull(configuration["TelegramBot:BotToken"]);
        Assert.NotNull(configuration["Ollama:Url"]);
        Assert.NotNull(configuration["Ollama:DefaultModel"]);
        Assert.NotNull(configuration["AI:MaxTokens"]);
        Assert.NotNull(configuration["AI:Temperature"]);
        Assert.NotNull(configuration["Database:ConnectionString"]);
        Assert.NotNull(configuration["Database:CommandTimeout"]);
        Assert.NotNull(configuration["Database:EnableSensitiveDataLogging"]);
    }

    [Fact]
    public void Program_ShouldHaveValidNumericConfigurationValues()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert - Check that numeric values can be parsed
        var maxTokensValue = configuration["AI:MaxTokens"];
        Assert.NotNull(maxTokensValue);
        Assert.True(int.TryParse(maxTokensValue, out var maxTokens));
        Assert.True(maxTokens > 0);

        var temperatureValue = configuration["AI:Temperature"];
        Assert.NotNull(temperatureValue);
        Assert.True(
            double.TryParse(
                temperatureValue,
                System.Globalization.NumberStyles.Float,
                System.Globalization.CultureInfo.InvariantCulture,
                out var temperature
            )
        );
        Assert.True(temperature >= 0 && temperature <= 2);

        Assert.True(int.TryParse(configuration["Database:CommandTimeout"], out var commandTimeout));
        Assert.True(commandTimeout > 0);

        Assert.True(bool.TryParse(configuration["Database:EnableSensitiveDataLogging"], out _));
    }

    [Fact]
    public void Program_ShouldHaveValidUrlConfigurationValues()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert - Check that URL values are valid
        var ollamaUrl = configuration["Ollama:Url"];
        Assert.NotNull(ollamaUrl);
        Assert.True(Uri.TryCreate(ollamaUrl, UriKind.Absolute, out var uri));
        Assert.True(uri.Scheme == "http" || uri.Scheme == "https");
    }

    [Fact]
    public void Program_ShouldHaveValidDatabaseConnectionString()
    {
        // Arrange
        var services = new ServiceCollection();
        ConfigureServices(services);

        // Act
        var serviceProvider = services.BuildServiceProvider();
        var configuration = serviceProvider.GetRequiredService<IConfiguration>();

        // Assert - Check that connection string has required components
        var connectionString = configuration["Database:ConnectionString"];
        Assert.NotNull(connectionString);
        Assert.Contains("Host=", connectionString);
        Assert.Contains("Port=", connectionString);
        Assert.Contains("Database=", connectionString);
        Assert.Contains("Username=", connectionString);
        Assert.Contains("Password=", connectionString);
    }
}