using System.CommandLine;
using JdeScoping.ConfigManager.Core.Services;
using Microsoft.Extensions.DependencyInjection;

namespace JdeScoping.ConfigManager.Cli.Commands;

/// <summary>
/// Validation command implementations.
/// </summary>
public static class ValidateCommand
{
    /// <summary>
    /// Creates the validate appsettings command.
    /// </summary>
    public static Command CreateAppSettingsCommand(
        IServiceProvider serviceProvider,
        Option<string?> configPathOption,
        Option<bool> verboseOption,
        Option<bool> quietOption)
    {
        var command = new Command("appsettings", "Validate appsettings.json");

        command.SetHandler(async (string? configPath, bool verbose, bool quiet) =>
        {
            var exitCode = await ValidateAppSettingsAsync(serviceProvider, configPath, verbose, quiet);
            Environment.ExitCode = exitCode;
        }, configPathOption, verboseOption, quietOption);

        return command;
    }

    /// <summary>
    /// Creates the validate pipelines command.
    /// </summary>
    public static Command CreatePipelinesCommand(
        IServiceProvider serviceProvider,
        Option<string?> configPathOption,
        Option<bool> verboseOption,
        Option<bool> quietOption)
    {
        var command = new Command("pipelines", "Validate pipeline configuration files");

        command.SetHandler(async (string? configPath, bool verbose, bool quiet) =>
        {
            var exitCode = await ValidatePipelinesAsync(serviceProvider, configPath, verbose, quiet);
            Environment.ExitCode = exitCode;
        }, configPathOption, verboseOption, quietOption);

        return command;
    }

    /// <summary>
    /// Creates the validate all command.
    /// </summary>
    public static Command CreateAllCommand(
        IServiceProvider serviceProvider,
        Option<string?> configPathOption,
        Option<bool> verboseOption,
        Option<bool> quietOption)
    {
        var command = new Command("all", "Validate all configuration files");

        command.SetHandler(async (string? configPath, bool verbose, bool quiet) =>
        {
            var exitCode1 = await ValidateAppSettingsAsync(serviceProvider, configPath, verbose, quiet);
            var exitCode2 = await ValidatePipelinesAsync(serviceProvider, configPath, verbose, quiet);
            Environment.ExitCode = Math.Max(exitCode1, exitCode2);
        }, configPathOption, verboseOption, quietOption);

        return command;
    }

    /// <summary>
    /// Creates the validate runtime command.
    /// </summary>
    public static Command CreateRuntimeCommand(
        IServiceProvider serviceProvider,
        Option<string?> configPathOption,
        Option<bool> verboseOption,
        Option<bool> quietOption)
    {
        var command = new Command("runtime", "Run Infrastructure validators");

        command.SetHandler(async (string? configPath, bool verbose, bool quiet) =>
        {
            var exitCode = await ValidateRuntimeAsync(serviceProvider, configPath, verbose, quiet);
            Environment.ExitCode = exitCode;
        }, configPathOption, verboseOption, quietOption);

        return command;
    }

    private static async Task<int> ValidateAppSettingsAsync(
        IServiceProvider serviceProvider,
        string? configPath,
        bool verbose,
        bool quiet)
    {
        var folderPath = await GetConfigFolderAsync(serviceProvider, configPath);
        if (folderPath == null)
        {
            Console.Error.WriteLine("Error: Could not find configuration folder. Use --config-path to specify.");
            return 1;
        }

        var configFileService = serviceProvider.GetRequiredService<IConfigFileService>();
        var validationService = serviceProvider.GetRequiredService<IValidationService>();

        var appSettingsPath = Path.Combine(folderPath, "appsettings.json");
        if (!File.Exists(appSettingsPath))
        {
            Console.Error.WriteLine($"Error: appsettings.json not found at {appSettingsPath}");
            return 1;
        }

        try
        {
            var config = await configFileService.LoadAppSettingsAsync(appSettingsPath);
            var result = validationService.ValidateAppSettings(config);

            if (!quiet)
            {
                Console.WriteLine("=== AppSettings Validation ===");
                Console.WriteLine($"File: {appSettingsPath}");
            }

            if (result.IsValid)
            {
                if (!quiet)
                    Console.WriteLine("Status: Valid");
                return 0;
            }

            foreach (var error in result.Errors)
            {
                Console.Error.WriteLine($"Error: {error}");
            }

            foreach (var warning in result.Warnings)
            {
                if (!quiet)
                    Console.WriteLine($"Warning: {warning}");
            }

            return 1;
        }
        catch (ConfigLoadException ex)
        {
            Console.Error.WriteLine($"Error loading configuration: {ex.Message}");
            return 1;
        }
    }

    private static async Task<int> ValidatePipelinesAsync(
        IServiceProvider serviceProvider,
        string? configPath,
        bool verbose,
        bool quiet)
    {
        var folderPath = await GetConfigFolderAsync(serviceProvider, configPath);
        if (folderPath == null)
        {
            Console.Error.WriteLine("Error: Could not find configuration folder. Use --config-path to specify.");
            return 1;
        }

        var configFileService = serviceProvider.GetRequiredService<IConfigFileService>();
        var validationService = serviceProvider.GetRequiredService<IValidationService>();

        var pipelinesDir = Path.Combine(folderPath, "Pipelines");

        try
        {
            var pipelines = await configFileService.LoadAllPipelinesAsync(pipelinesDir);
            var result = validationService.ValidatePipelines(pipelines);

            if (!quiet)
            {
                Console.WriteLine("=== Pipelines Validation ===");
                Console.WriteLine($"Directory: {pipelinesDir}");
                Console.WriteLine($"Pipelines found: {pipelines.Count}");
            }

            if (result.IsValid)
            {
                if (!quiet)
                    Console.WriteLine("Status: Valid");
                return 0;
            }

            foreach (var error in result.Errors)
            {
                Console.Error.WriteLine($"Error: {error}");
            }

            foreach (var warning in result.Warnings)
            {
                if (!quiet)
                    Console.WriteLine($"Warning: {warning}");
            }

            return result.Errors.Count > 0 ? 1 : 0;
        }
        catch (Exception ex)
        {
            Console.Error.WriteLine($"Error validating pipelines: {ex.Message}");
            return 1;
        }
    }

    private static async Task<int> ValidateRuntimeAsync(
        IServiceProvider serviceProvider,
        string? configPath,
        bool verbose,
        bool quiet)
    {
        var folderPath = await GetConfigFolderAsync(serviceProvider, configPath);
        if (folderPath == null)
        {
            Console.Error.WriteLine("Error: Could not find configuration folder. Use --config-path to specify.");
            return 1;
        }

        var runtimeValidationService = serviceProvider.GetRequiredService<IRuntimeConfigValidationService>();

        if (!quiet)
        {
            Console.WriteLine("=== Runtime Configuration Validation ===");
            Console.WriteLine($"Folder: {folderPath}");
        }

        var results = runtimeValidationService.ValidateRuntimeConfig(folderPath);
        var hasErrors = false;

        foreach (var result in results)
        {
            if (result.Errors.Count > 0)
            {
                hasErrors = true;
                Console.Error.WriteLine($"\n[{result.ValidatorName}]");
                foreach (var error in result.Errors)
                {
                    Console.Error.WriteLine($"  Error: {error}");
                }
            }
            else if (!quiet)
            {
                Console.WriteLine($"[{result.ValidatorName}]: OK");
            }

            foreach (var warning in result.Warnings)
            {
                if (!quiet)
                    Console.WriteLine($"  Warning: {warning}");
            }
        }

        return hasErrors ? 1 : 0;
    }

    private static async Task<string?> GetConfigFolderAsync(IServiceProvider serviceProvider, string? configPath)
    {
        if (!string.IsNullOrEmpty(configPath))
        {
            if (Directory.Exists(configPath))
                return configPath;
            return null;
        }

        var autoDiscoveryService = serviceProvider.GetRequiredService<IAutoDiscoveryService>();
        return await autoDiscoveryService.FindConfigFolderAsync();
    }
}