using System.Data.SqlClient;

namespace Bit.Setup;

public class EnvironmentFileBuilder
{
    private readonly Context _context;

    private IDictionary<string, string> _globalValues;
    private IDictionary<string, string> _mssqlValues;
    private IDictionary<string, string> _globalOverrideValues;
    private IDictionary<string, string> _mssqlOverrideValues;
    private IDictionary<string, string> _keyConnectorOverrideValues;

    public EnvironmentFileBuilder(Context context)
    {
        _context = context;
        _globalValues = new Dictionary<string, string>
        {
            ["ASPNETCORE_ENVIRONMENT"] = "Production",
            ["globalSettings__selfHosted"] = "true",
            ["globalSettings__baseServiceUri__vault"] = "http://localhost",
            ["globalSettings__pushRelayBaseUri"] = "https://push.bitwarden.com",
        };
        _mssqlValues = new Dictionary<string, string>
        {
            ["ACCEPT_EULA"] = "Y",
            ["MSSQL_PID"] = "Express",
            ["SA_PASSWORD"] = "SECRET",
        };
    }

    public void BuildForInstaller()
    {
        Directory.CreateDirectory("/bitwarden/env/");
        Init();
        Build();
    }

    public void BuildForUpdater()
    {
        Init();
        LoadExistingValues(_globalOverrideValues, "/bitwarden/env/global.override.env");
        LoadExistingValues(_mssqlOverrideValues, "/bitwarden/env/mssql.override.env");
        LoadExistingValues(_keyConnectorOverrideValues, "/bitwarden/env/key-connector.override.env");

        if (_context.Config.PushNotifications &&
            _globalOverrideValues.ContainsKey("globalSettings__pushRelayBaseUri") &&
            _globalOverrideValues["globalSettings__pushRelayBaseUri"] == "REPLACE")
        {
            _globalOverrideValues.Remove("globalSettings__pushRelayBaseUri");
        }

        Build();
    }

    private void Init()
    {
        var dbPassword = _context.Stub ? "RANDOM_DATABASE_PASSWORD" : Helpers.SecureRandomString(32);
        var dbConnectionString = new SqlConnectionStringBuilder
        {
            DataSource = "tcp:mssql,1433",
            InitialCatalog = _context.Install?.Database ?? "vault",
            UserID = "sa",
            Password = dbPassword,
            MultipleActiveResultSets = false,
            Encrypt = true,
            ConnectTimeout = 30,
            TrustServerCertificate = true,
            PersistSecurityInfo = false
        }.ConnectionString;

        _globalOverrideValues = new Dictionary<string, string>
        {
            ["globalSettings__baseServiceUri__vault"] = _context.Config.Url,
            ["globalSettings__sqlServer__connectionString"] = $"\"{dbConnectionString.Replace("\"", "\\\"")}\"",
            ["globalSettings__identityServer__certificatePassword"] = _context.Install?.IdentityCertPassword,
            ["globalSettings__internalIdentityKey"] = _context.Stub ? "RANDOM_IDENTITY_KEY" :
                Helpers.SecureRandomString(64, alpha: true, numeric: true),
            ["globalSettings__oidcIdentityClientKey"] = _context.Stub ? "RANDOM_IDENTITY_KEY" :
                Helpers.SecureRandomString(64, alpha: true, numeric: true),
            ["globalSettings__duo__aKey"] = _context.Stub ? "RANDOM_DUO_AKEY" :
                Helpers.SecureRandomString(64, alpha: true, numeric: true),
            ["globalSettings__installation__id"] = _context.Install?.InstallationId.ToString(),
            ["globalSettings__installation__key"] = _context.Install?.InstallationKey,
            ["globalSettings__yubico__clientId"] = "REPLACE",
            ["globalSettings__yubico__key"] = "REPLACE",
            ["globalSettings__mail__replyToEmail"] = $"no-reply@{_context.Config.Domain}",
            ["globalSettings__mail__smtp__host"] = "REPLACE",
            ["globalSettings__mail__smtp__port"] = "587",
            ["globalSettings__mail__smtp__ssl"] = "false",
            ["globalSettings__mail__smtp__username"] = "REPLACE",
            ["globalSettings__mail__smtp__password"] = "REPLACE",
            ["globalSettings__disableUserRegistration"] = "false",
            ["globalSettings__hibpApiKey"] = "REPLACE",
            ["adminSettings__admins"] = string.Empty,
        };

        if (!_context.Config.PushNotifications)
        {
            _globalOverrideValues.Add("globalSettings__pushRelayBaseUri", "REPLACE");
        }

        _mssqlOverrideValues = new Dictionary<string, string>
        {
            ["SA_PASSWORD"] = dbPassword,
        };

        _keyConnectorOverrideValues = new Dictionary<string, string>
        {
            ["keyConnectorSettings__webVaultUri"] = _context.Config.Url,
            ["keyConnectorSettings__identityServerUri"] = "http://identity:5000",
            ["keyConnectorSettings__database__provider"] = "json",
            ["keyConnectorSettings__database__jsonFilePath"] = "/etc/bitwarden/key-connector/data.json",
            ["keyConnectorSettings__rsaKey__provider"] = "certificate",
            ["keyConnectorSettings__certificate__provider"] = "filesystem",
            ["keyConnectorSettings__certificate__filesystemPath"] = "/etc/bitwarden/key-connector/bwkc.pfx",
            ["keyConnectorSettings__certificate__filesystemPassword"] = Helpers.SecureRandomString(32, alpha: true, numeric: true),
        };
    }

    private void LoadExistingValues(IDictionary<string, string> _values, string file)
    {
        if (!File.Exists(file))
        {
            return;
        }

        var fileLines = File.ReadAllLines(file);
        foreach (var line in fileLines)
        {
            if (!line.Contains("="))
            {
                continue;
            }

            var value = string.Empty;
            var lineParts = line.Split("=", 2);
            if (lineParts.Length < 1)
            {
                continue;
            }

            if (lineParts.Length > 1)
            {
                value = lineParts[1];
            }

            if (_values.ContainsKey(lineParts[0]))
            {
                _values[lineParts[0]] = value;
            }
            else
            {
                _values.Add(lineParts[0], value.Replace("\\\"", "\""));
            }
        }
    }

    private void Build()
    {
        var template = Helpers.ReadTemplate("EnvironmentFile");

        Helpers.WriteLine(_context, "Building docker environment files.");
        Directory.CreateDirectory("/bitwarden/docker/");
        using (var sw = File.CreateText("/bitwarden/docker/global.env"))
        {
            sw.Write(template(new TemplateModel(_globalValues)));
        }
        Helpers.Exec("chmod 600 /bitwarden/docker/global.env");

        using (var sw = File.CreateText("/bitwarden/docker/mssql.env"))
        {
            sw.Write(template(new TemplateModel(_mssqlValues)));
        }
        Helpers.Exec("chmod 600 /bitwarden/docker/mssql.env");

        Helpers.WriteLine(_context, "Building docker environment override files.");
        Directory.CreateDirectory("/bitwarden/env/");
        using (var sw = File.CreateText("/bitwarden/env/global.override.env"))
        {
            sw.Write(template(new TemplateModel(_globalOverrideValues)));
        }
        Helpers.Exec("chmod 600 /bitwarden/env/global.override.env");

        using (var sw = File.CreateText("/bitwarden/env/mssql.override.env"))
        {
            sw.Write(template(new TemplateModel(_mssqlOverrideValues)));
        }
        Helpers.Exec("chmod 600 /bitwarden/env/mssql.override.env");

        if (_context.Config.EnableKeyConnector)
        {
            using (var sw = File.CreateText("/bitwarden/env/key-connector.override.env"))
            {
                sw.Write(template(new TemplateModel(_keyConnectorOverrideValues)));
            }

            Helpers.Exec("chmod 600 /bitwarden/env/key-connector.override.env");
        }

        // Empty uid env file. Only used on Linux hosts.
        if (!File.Exists("/bitwarden/env/uid.env"))
        {
            using (var sw = File.CreateText("/bitwarden/env/uid.env")) { }
        }
    }

    public class TemplateModel
    {
        public TemplateModel(IEnumerable<KeyValuePair<string, string>> variables)
        {
            Variables = variables.Select(v => new Kvp { Key = v.Key, Value = v.Value });
        }

        public IEnumerable<Kvp> Variables { get; set; }

        public class Kvp
        {
            public string Key { get; set; }
            public string Value { get; set; }
        }
    }
}