WIP

PlanTempus.Core/Configurations/SmartConfigProvider/AppConfiguration.cs

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+namespace PlanTempus.Core.Configurations.SmartConfigProvider;
+public class AppConfiguration
+{
+    public long Id { get; set; }
+    public string Key { get; set; }
+    public object Value { get; set; }
+    public string Label { get; set; }
+    public string ContentType { get; set; }
+    public DateTime? ValidFrom { get; set; }
+    public DateTime? ExpiresAt { get; set; }
+    public DateTime? CreatedAt { get; set; }
+    public DateTime? ModifiedAt { get; set; }
+    public Guid? Etag { get; set; }
+}

PlanTempus.Core/Configurations/SmartConfigProvider/IConfigurationRepository.cs

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+namespace PlanTempus.Core.Configurations.SmartConfigProvider;
+public interface IConfigurationRepository
+{
+    string ConnectionString { get; set; }
+    IEnumerable<AppConfiguration> GetActiveConfigurations();
+}
+

PlanTempus.Core/Configurations/SmartConfigProvider/Repositories/PostgresConfigurationRepository.cs

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+using System.Data;
+using Insight.Database;
+
+namespace PlanTempus.Core.Configurations.SmartConfigProvider.Repositories;
+public class PostgresConfigurationRepository : IConfigurationRepository
+{
+    private IDbConnection _connection;
+    public string ConnectionString { get; set; }
+
+
+    public PostgresConfigurationRepository(string connectionString)
+    {
+        _connection = new Npgsql.NpgsqlConnection(connectionString);
+    }
+    public PostgresConfigurationRepository()
+    {
+
+    }
+    public IEnumerable<AppConfiguration> GetActiveConfigurations()
+    {
+        _connection ??= new Npgsql.NpgsqlConnection(ConnectionString);
+
+        const string sql = @"
+            SELECT id, ""key"", value, label, content_type, 
+                   valid_from, expires_at, created_at, modified_at, etag 
+            FROM app_configuration 
+            WHERE CURRENT_TIMESTAMP BETWEEN valid_from AND expires_at
+               OR (valid_from IS NULL AND expires_at IS NULL)";
+
+
+        return _connection.QuerySql<AppConfiguration>(sql);
+
+    }
+}

PlanTempus.Core/Configurations/SmartConfigProvider/SmartConfigExtension.cs

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+using PlanTempus.Core.Configurations;
+
+namespace PlanTempus.Core.Configurations.SmartConfigProvider
+{
+    /// <summary>
+    /// Extension methods for adding smart configuration providers to IConfigurationBuilder.
+    /// </summary>
+    public static class SmartConfigExtension
+    {
+        /// <summary>
+        /// Adds a smart configuration provider using a connection string from appsettings.
+        /// </summary>
+        /// <param name="builder">The configuration builder to add to</param>
+        /// <param name="configKey">The key to find the connection string in the ConnectionStrings section. Defaults to "DefaultConnection"</param>
+        /// <param name="path">Optional path to configuration file if different from default appsettings location</param>
+        /// <returns>The configuration builder</returns>
+        public static IConfigurationBuilder AddSmartConfig(this IConfigurationBuilder builder, string configKey = "DefaultConnection", string path = null)
+        {
+            return builder.AddProvider(new SmartConfigProvider(builder, configKey, path));
+        }
+        /// <summary>
+        /// Adds a smart configuration provider with custom configuration options.
+        /// </summary>
+        /// <param name="builder">The configuration builder to add to</param>
+        /// <param name="setupAction">Action to configure the smart configuration options</param>
+        /// <returns>The configuration builder</returns>
+        public static IConfigurationBuilder AddSmartConfig(this IConfigurationBuilder builder, Action<SmartConfigOptions> setupAction)
+        {
+            var options = new SmartConfigOptions();
+            setupAction(options);
+
+            return builder.AddProvider(new SmartConfigProvider(builder, options));
+        }
+    }
+}

PlanTempus.Core/Configurations/SmartConfigProvider/SmartConfigOptions.cs

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+namespace PlanTempus.Core.Configurations.SmartConfigProvider
+{
+    /// <summary>
+    /// Configuration options for setting up smart configuration providers.
+    /// Provides fluent configuration methods for specifying the repository type and settings.
+    /// </summary>
+    public class SmartConfigOptions
+    {
+        private IConfigurationRepository _repository;
+        internal string _configKey;
+
+        /// <summary>
+        /// Configures the smart configuration to use PostgreSQL as the configuration store.
+        /// </summary>
+        /// <param name="configKey">The configuration key used to find the connection string</param>
+        /// <returns>The configuration options instance for method chaining</returns>
+        public SmartConfigOptions UsePostgres(string configKey)
+        {
+            _configKey = configKey;
+            _repository = new Repositories.PostgresConfigurationRepository();
+            return this;
+        }
+        /// <summary>
+        /// Configures the smart configuration to use SQL Server as the configuration store.
+        /// </summary>
+        /// <returns>The configuration options instance for method chaining</returns>
+        /// <exception cref="NotImplementedException">This feature is not yet implemented</exception>
+        public SmartConfigOptions UseSqlServer()
+        {
+            throw new NotImplementedException();
+        }
+        /// <summary>
+        /// Configures the smart configuration to use a custom configuration repository.
+        /// </summary>
+        /// <param name="repository">The configuration repository to use</param>
+        /// <returns>The configuration options instance for method chaining</returns>
+        public SmartConfigOptions UseRepository(IConfigurationRepository repository)
+        {
+            _repository = repository;
+            return this;
+        }
+
+        internal IConfigurationRepository GetRepository() => _repository;
+    }
+}

PlanTempus.Core/Configurations/SmartConfigProvider/SmartConfigProvider.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using PlanTempus.Core.Configurations.JsonConfigProvider;
+using PlanTempus.Core.Exceptions;
+
+namespace PlanTempus.Core.Configurations.SmartConfigProvider
+{
+    /// <summary>
+    /// Configuration provider that loads configuration from a smart configuration source (e.g. database).
+    /// The provider reads connection details from a JSON file and uses them to connect to a configuration repository.
+    /// </summary>
+    /// <remarks>
+    /// The provider supports multiple initialization methods:
+    /// - Through SmartConfigOptions for flexible repository configuration
+    /// - Through direct configuration key and file path
+    /// Configuration is loaded from the repository during Build() and converted to a JSON structure.
+    /// </remarks>
+    public class SmartConfigProvider : IConfigurationProvider
+    {
+        string _configKey;
+        string _connectionString;
+        string _path;
+        IConfigurationBuilder _builder;
+
+        JObject _configuration;
+        SmartConfigOptions _smartConfigOptions;
+
+        public SmartConfigProvider() { }
+
+        public SmartConfigProvider(IConfigurationBuilder builder, SmartConfigOptions smartConfigOptions)
+        {
+            _builder = builder;
+            _smartConfigOptions = smartConfigOptions;
+            _configKey = smartConfigOptions._configKey;
+            SetConnectionString();
+
+        }
+        public SmartConfigProvider(IConfigurationBuilder builder, string configKey, string configurationFilePath)
+        {
+            _builder = builder;
+            _configKey = configKey;
+            _path = configurationFilePath;
+            SetConnectionString();
+        }
+
+        void SetConnectionString()
+        {
+            var carrier = _builder.ConfigurationProviders.OfType<IHasConfigurationFilePath>().SingleOrDefault();
+
+            if (carrier?.ConfigurationFilePath is null && _path is null)
+                throw new ConfigurationException($"Expected a previous added ConfigurationProvider with IHasConfigurationFilePath or a configurationFilePath where to find the appsettingsfile");
+
+            _path ??= carrier.ConfigurationFilePath;
+
+            if (!File.Exists(_path))
+                throw new ConfigurationException($"File not found, configurationFilePath: {_path}");
+
+
+            using (StreamReader file = File.OpenText(_path))
+            using (JsonTextReader reader = new JsonTextReader(file))
+            {
+                var jsonConfiguration = (JObject)JToken.ReadFrom(reader);
+
+                _connectionString = jsonConfiguration.SelectToken($"ConnectionStrings.{_configKey}")?.ToString();
+            }
+        }
+        public void Build()
+        {
+            var repository = _smartConfigOptions.GetRepository();
+            repository.ConnectionString = _connectionString;
+
+            var configs = repository.GetActiveConfigurations();
+
+            var pairs = configs.Select(x => new KeyValuePair<string, JToken>(x.Key, JToken.Parse(x.Value.ToString())));
+
+            _configuration = Common.KeyValueToJson.Convert(pairs);
+
+        }
+
+        public JObject Configuration()
+        {
+            return _configuration;
+        }
+    }
+}