using Bit.Migrator;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Globalization;
using System.Net.Http;

namespace Bit.Setup
{
    public class Program
    {
        private static Context _context;

        public static void Main(string[] args)
        {
            CultureInfo.DefaultThreadCurrentCulture = new CultureInfo("en-US");

            _context = new Context
            {
                Args = args
            };
            ParseParameters();

            if (_context.Parameters.ContainsKey("q"))
            {
                _context.Quiet = _context.Parameters["q"] == "true" || _context.Parameters["q"] == "1";
            }
            if (_context.Parameters.ContainsKey("os"))
            {
                _context.HostOS = _context.Parameters["os"];
            }
            if (_context.Parameters.ContainsKey("corev"))
            {
                _context.CoreVersion = _context.Parameters["corev"];
            }
            if (_context.Parameters.ContainsKey("webv"))
            {
                _context.WebVersion = _context.Parameters["webv"];
            }
            if (_context.Parameters.ContainsKey("stub"))
            {
                _context.Stub = _context.Parameters["stub"] == "true" ||
                    _context.Parameters["stub"] == "1";
            }

            Helpers.WriteLine(_context);

            if (_context.Parameters.ContainsKey("install"))
            {
                Install();
            }
            else if (_context.Parameters.ContainsKey("update"))
            {
                Update();
            }
            else if (_context.Parameters.ContainsKey("printenv"))
            {
                PrintEnvironment();
            }
            else
            {
                Helpers.WriteLine(_context, "No top-level command detected. Exiting...");
            }
        }

        private static void Install()
        {
            if (_context.Parameters.ContainsKey("letsencrypt"))
            {
                _context.Config.SslManagedLetsEncrypt =
                    _context.Parameters["letsencrypt"].ToLowerInvariant() == "y";
            }
            if (_context.Parameters.ContainsKey("domain"))
            {
                _context.Install.Domain = _context.Parameters["domain"].ToLowerInvariant();
            }

            if (_context.Stub)
            {
                _context.Install.InstallationId = Guid.Empty;
                _context.Install.InstallationKey = "SECRET_INSTALLATION_KEY";
            }
            else if (!ValidateInstallation())
            {
                return;
            }

            var certBuilder = new CertBuilder(_context);
            certBuilder.BuildForInstall();

            // Set the URL
            _context.Config.Url = string.Format("http{0}://{1}",
                _context.Config.Ssl ? "s" : string.Empty, _context.Install.Domain);

            var nginxBuilder = new NginxConfigBuilder(_context);
            nginxBuilder.BuildForInstaller();

            var environmentFileBuilder = new EnvironmentFileBuilder(_context);
            environmentFileBuilder.BuildForInstaller();

            var appIdBuilder = new AppIdBuilder(_context);
            appIdBuilder.Build();

            var dockerComposeBuilder = new DockerComposeBuilder(_context);
            dockerComposeBuilder.BuildForInstaller();

            _context.SaveConfiguration();

            Console.WriteLine("\nInstallation complete");

            Console.WriteLine("\nIf you need to make additional configuration changes, you can modify\n" +
                "the settings in `{0}` and then run:\n{1}",
                _context.HostOS == "win" ? ".\\bwdata\\config.yml" : "./bwdata/config.yml",
                _context.HostOS == "win" ? "`.\\bitwarden.ps1 -rebuild` or `.\\bitwarden.ps1 -update`" :
                    "`./bitwarden.sh rebuild` or `./bitwarden.sh update`");

            Console.WriteLine("\nNext steps, run:");
            if (_context.HostOS == "win")
            {
                Console.WriteLine("`.\\bitwarden.ps1 -start`");
            }
            else
            {
                Console.WriteLine("`./bitwarden.sh start`");
            }
            Console.WriteLine(string.Empty);
        }

        private static void Update()
        {
            if (_context.Parameters.ContainsKey("db"))
            {
                MigrateDatabase();
            }
            else
            {
                RebuildConfigs();
            }
        }

        private static void PrintEnvironment()
        {
            _context.LoadConfiguration();
            if (!_context.PrintToScreen())
            {
                return;
            }
            Console.WriteLine("\nBitwarden is up and running!");
            Console.WriteLine("===================================================");
            Console.WriteLine("\nvisit {0}", _context.Config.Url);
            Console.Write("to update, run ");
            if (_context.HostOS == "win")
            {
                Console.Write("`.\\bitwarden.ps1 -updateself` and then `.\\bitwarden.ps1 -update`");
            }
            else
            {
                Console.Write("`./bitwarden.sh updateself` and then `./bitwarden.sh update`");
            }
            Console.WriteLine("\n");
        }

        private static void MigrateDatabase(int attempt = 1)
        {
            try
            {
                Helpers.WriteLine(_context, "Migrating database.");
                var vaultConnectionString = Helpers.GetValueFromEnvFile("global",
                    "globalSettings__sqlServer__connectionString");
                var migrator = new DbMigrator(vaultConnectionString, null);
                var success = migrator.MigrateMsSqlDatabase(false);
                if (success)
                {
                    Helpers.WriteLine(_context, "Migration successful.");
                }
                else
                {
                    Helpers.WriteLine(_context, "Migration failed.");
                }
            }
            catch (SqlException e)
            {
                if (e.Message.Contains("Server is in script upgrade mode") && attempt < 10)
                {
                    var nextAttempt = attempt + 1;
                    Helpers.WriteLine(_context, "Database is in script upgrade mode. " +
                        "Trying again (attempt #{0})...", nextAttempt);
                    System.Threading.Thread.Sleep(20000);
                    MigrateDatabase(nextAttempt);
                    return;
                }
                throw e;
            }
        }

        private static bool ValidateInstallation()
        {
            var installationId = string.Empty;
            var installationKey = string.Empty;
            
            if (_context.Parameters.ContainsKey("install-id"))
            {
                installationId = _context.Parameters["install-id"].ToLowerInvariant();
            }
            else
            {
                installationId = Helpers.ReadInput("Enter your installation id (get at https://bitwarden.com/host)");                
            }
            
            if (!Guid.TryParse(installationId.Trim(), out var installationidGuid))
            {
                Console.WriteLine("Invalid installation id.");
                return false;
            }

            if (_context.Parameters.ContainsKey("install-key"))
            {
                installationKey = _context.Parameters["install-key"];
            }
            else
            {
                installationKey = Helpers.ReadInput("Enter your installation key");
            }
            
            _context.Install.InstallationId = installationidGuid;
            _context.Install.InstallationKey = installationKey;

            try
            {
                var response = new HttpClient().GetAsync("https://api.bitwarden.com/installations/" +
                    _context.Install.InstallationId).GetAwaiter().GetResult();

                if (!response.IsSuccessStatusCode)
                {
                    if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
                    {
                        Console.WriteLine("Invalid installation id.");
                    }
                    else
                    {
                        Console.WriteLine("Unable to validate installation id.");
                    }

                    return false;
                }

                var resultString = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
                var result = JsonConvert.DeserializeObject<dynamic>(resultString);
                if (!(bool)result.Enabled)
                {
                    Console.WriteLine("Installation id has been disabled.");
                    return false;
                }

                return true;
            }
            catch
            {
                Console.WriteLine("Unable to validate installation id. Problem contacting Bitwarden server.");
                return false;
            }
        }

        private static void RebuildConfigs()
        {
            _context.LoadConfiguration();

            var environmentFileBuilder = new EnvironmentFileBuilder(_context);
            environmentFileBuilder.BuildForUpdater();

            var nginxBuilder = new NginxConfigBuilder(_context);
            nginxBuilder.BuildForUpdater();

            var appIdBuilder = new AppIdBuilder(_context);
            appIdBuilder.Build();

            var dockerComposeBuilder = new DockerComposeBuilder(_context);
            dockerComposeBuilder.BuildForUpdater();

            _context.SaveConfiguration();
            Console.WriteLine(string.Empty);
        }

        private static void ParseParameters()
        {
            _context.Parameters = new Dictionary<string, string>();
            for (var i = 0; i < _context.Args.Length; i = i + 2)
            {
                if (!_context.Args[i].StartsWith("-"))
                {
                    continue;
                }

                _context.Parameters.Add(_context.Args[i].Substring(1), _context.Args[i + 1]);
            }
        }
    }
}