using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using Application.Helpers;
using Infrastructure;
using Microsoft.EntityFrameworkCore;
using MongoDB.Driver;
using Newtonsoft.Json.Linq;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.OpenSsl;

namespace API;

public static class StartupHelper
{
    public static X509Certificate2 LoadCertificateWithKey(string certPath, string keyPath)
    {
        var cert = new X509Certificate2(certPath);

        AsymmetricKeyParameter key;
        using (var reader = File.OpenText(keyPath))
        {
            var pemReader = new PemReader(reader);
            key = (AsymmetricKeyParameter)pemReader.ReadObject();
        }

        if (key is not RsaPrivateCrtKeyParameters rsaKey)
            throw new ArgumentException("Unsupported key type");

        var rsa = RSA.Create();
        rsa.ImportParameters(new RSAParameters
        {
            Modulus = rsaKey.Modulus.ToByteArrayUnsigned(),
            Exponent = rsaKey.PublicExponent.ToByteArrayUnsigned(),
            D = rsaKey.Exponent.ToByteArrayUnsigned(),
            P = rsaKey.P.ToByteArrayUnsigned(),
            Q = rsaKey.Q.ToByteArrayUnsigned(),
            DP = rsaKey.DP.ToByteArrayUnsigned(),
            DQ = rsaKey.DQ.ToByteArrayUnsigned(),
            InverseQ = rsaKey.QInv.ToByteArrayUnsigned()
        });

        return cert.CopyWithPrivateKey(rsa);
    }

    public static void EnsureSslCertificate()
    {
        var certPath = "certs"; // Directory to store certificates
        Directory.CreateDirectory(certPath); // Ensure the directory exists

        var certFile = Path.Combine(certPath, "server.crt");
        var keyFile = Path.Combine(certPath, "server.key");

        if (!File.Exists(certFile) || !File.Exists(keyFile))
        {
            Console.WriteLine("Generating SSL certificate...");

            // Command to generate a private key and certificate
            ExecuteCommand(
                $"openssl req -x509 -newkey rsa:4096 -keyout \"{keyFile}\" -out \"{certFile}\" -days 365 -nodes -subj \"/CN=localhost\"");
        }
        else
        {
            Console.WriteLine("SSL certificate already exists.");
        }
    }


    private static void ExecuteCommand(string command)
    {
        string fileName, arguments;

        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            fileName = "cmd.exe";
            arguments = "/c \"" + command + "\"";
        }
        else
        {
            fileName = "/bin/bash";
            arguments = "-c \"" + command.Replace("\"", "\\\"") + "\""; // Properly escape quotes
        }

        var processInfo = new ProcessStartInfo(fileName, arguments)
        {
            CreateNoWindow = true,
            UseShellExecute = false,
            RedirectStandardOutput = true,
            RedirectStandardError = true
        };

        using (var process = Process.Start(processInfo))
        {
            if (process != null)
            {
                process.WaitForExit();

                var output = process.StandardOutput.ReadToEnd();
                var error = process.StandardError.ReadToEnd();

                Console.WriteLine("Command executed: " + command);
                if (!string.IsNullOrEmpty(output)) Console.WriteLine("Output: " + output);
                if (!string.IsNullOrEmpty(error)) Console.WriteLine("Error: " + error);
            }
        }
    }


    public static void EnsureKeysGenerated(IConfiguration configuration, string contentRootPath)
    {
        var apiKey = configuration["ApiKey"];
        var jwtSecretKey = configuration["Jwt:SecretKey"];
        var medicalHistoryKey = configuration["MedicalRecordsKey"];
        var appSettingsPath = Path.Combine(contentRootPath, "appsettings.json");
        var json = JObject.Parse(File.ReadAllText(appSettingsPath));
        var modified = false;

        if (string.IsNullOrEmpty(apiKey))
        {
            var newApiKey = KeyGenerator.GenerateApiKey();
            json["ApiKey"] = newApiKey;
            modified = true;
        }

        if (string.IsNullOrEmpty(medicalHistoryKey))
        {
            var newMedicalHistoryKey = KeyGenerator.GenerateApiKey();
            json["MedicalRecordsKey"] = newMedicalHistoryKey;
            modified = true;
        }

        if (string.IsNullOrEmpty(jwtSecretKey))
        {
            var newJwtSecretKey = KeyGenerator.GenerateJwtSecretKey();
            json["Jwt"]["SecretKey"] = newJwtSecretKey;
            modified = true;
        }

        if (modified) File.WriteAllText(appSettingsPath, json.ToString());
    }

    public static void EnsureMongoDatabaseAndCollectionsExist(IConfiguration configuration)
    {
        var mongoConnectionString = configuration["ConnectionStrings:MongoDBConnection"];
        var mongoClient = new MongoClient(mongoConnectionString);
        var databaseName = configuration["HealthcareManagerDatabase:Name"];
        var database = mongoClient.GetDatabase(databaseName);

        var requiredCollections = new List<string>
        {
            configuration["HealthcareManagerDatabase:MedicalRecordCollectionName"],
            configuration["HealthcareManagerDatabase:ChatCollectionName"],
            configuration["HealthcareManagerDatabase:AppointmentsCollectionName"]
        };

        var existingCollections = database.ListCollectionNames().ToList();

        foreach (var collectionName in requiredCollections)
            if (!existingCollections.Contains(collectionName))
                database.CreateCollection(collectionName);
    }

    public static void EnsureDatabaseCreated(HealthcareManagerDatabase dbContext)
    {
        if (dbContext.Database.GetPendingMigrations().Any()) dbContext.Database.Migrate();
    }
}