using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using MongoDB.Bson.Serialization.Conventions;
using xCommons.Extensions;
using xDataService.Configuration;
using xDataService.Constants;
using xDataService.Db;
using xDataService.DI;
using xDataService.Interfaces;

namespace xDataService.Models
{
    /// <summary>
    /// Data Base Descriptor ...
    /// </summary>
    public abstract class XDatabaseDescriptor : IXDatabaseDescriptor
    {
        //
        #region Props ...
        /// <summary>
        /// Database Name ...
        /// </summary>
        /// <value></value>
        public virtual string Name { get; set; }

        /// <summary>
        /// Database Provider ...
        /// </summary>
        /// <value></value>
        public virtual XDbProviders Provider { get; set; }

        /// <summary>
        /// Db Context...
        /// </summary>
        /// <value></value>
        public virtual Type Context { get; set; } = null;

        /// <summary>
        /// Database Connecion String ...
        /// </summary>
        /// <value></value>
        public virtual string ConnectionString { get; set; }

        /// <summary>
        /// Data Service Configuration ...
        /// </summary>
        /// <value></value>
        public virtual XDataBaseConfiguration Configuration { get; set; }

        /// <summary>
        /// Repositories Descriptions ...
        /// </summary>
        /// <value></value>
        public virtual IList<XRepositoryDescriptor> Repositories { get; set; } = null;

        /// <summary>
        /// Mongo Convention Packs ...
        /// </summary>
        public ConventionPack ConventionPacks { get; set; } = null;

        /// <summary>
        /// DbContext Options Builder ...
        /// </summary>
        /// <value></value>
        public Action<dynamic> OptionsBuilder { get; set; } = null;
        #endregion

        //
        #region Constructor ...
        /// <summary>
        /// Constructor of Descriptor ...
        /// </summary>
        /// <param name="name"></param>
        /// <param name="configuration"></param>
        /// <param name="repositories"></param>
        public XDatabaseDescriptor(
            string name,
            IList<XRepositoryDescriptor> repositories = null
        )
        {
            //
            Name = name;
            Repositories = repositories;
        }
        #endregion

        //
        #region Configure ...
        /// <summary>
        /// Configure Database Descriptor using Registered Services ...
        /// </summary>
        /// <param name="services"></param>
        public void Configure(
            IServiceCollection services
        )
        {
            //
            bool isValid = !Name.IsNullOrEmpty();
            if (!isValid)
            {
                return;
            }

            //
            var xDataServiceConfiguration = services.GetRegisteredService<XDataServiceConfiguration>();
            isValid =
                !xDataServiceConfiguration.IsNullOrDefault() &&
                xDataServiceConfiguration.Databases.HasChild() &&
                xDataServiceConfiguration.Databases.Keys.Any(k => k == Name);
            if (!isValid)
            {
                return;
            }

            //
            var database = xDataServiceConfiguration.Databases[Name];
            isValid = !database.IsNullOrDefault();
            if (!isValid)
            {
                return;
            }

            //
            Configure(database);
        }

        /// <summary>
        /// Configure Database Descriptor using IConfiguration ...
        /// </summary>
        /// <param name="configuration"></param>
        public void Configure(
            IConfiguration configuration
        )
        {
            //
            bool isValid = !Name.IsNullOrEmpty();
            if (!isValid)
            {
                return;
            }

            //
            var xDataServiceConfiguration = configuration.GetXDataServiceConfiguration();
            isValid =
                !xDataServiceConfiguration.IsNullOrDefault() &&
                xDataServiceConfiguration.Databases.HasChild() &&
                xDataServiceConfiguration.Databases.Keys.Any(k => k == Name);
            if (!isValid)
            {
                return;
            }

            //
            var database = xDataServiceConfiguration.Databases[Name];
            isValid = !database.IsNullOrDefault();
            if (!isValid)
            {
                return;
            }

            //
            Configure(database);
        }

        /// <summary>
        /// Configure Database Descriptor using Database Configuration ...
        /// </summary>
        /// <param name="configuration"></param>
        public void Configure(
            XDataBaseConfiguration configuration
        )
        {
            //
            Configuration = configuration;
            Provider = configuration.Provider;
            ConnectionString = configuration.ConnectionString;
        }

        /// <summary>
        /// Configure Database Descriptor using Provider and Connection String ...
        /// </summary>
        /// <param name="provider"></param>
        /// <param name="connectionString"></param>
        public void Configure(
            XDbProviders provider,
            string connectionString
        )
        {
            //
            Provider = provider;
            ConnectionString = connectionString;
            Configuration = new XDataBaseConfiguration
            {
                Provider = provider,
                ConnectionString = connectionString
            };
        }
        #endregion
    }

    /// <summary>
    /// Data Base Descriptor ...
    /// </summary>
    /// <typeparam name="TContext"></typeparam>
    public abstract class XDatabaseDescriptor<TContext> : XDatabaseDescriptor, IXDatabaseDescriptor<TContext>
    where TContext : XDbContext
    {
        /// <summary>
        /// Constructor of Descriptor ...
        /// </summary>
        /// <param name="name"></param>
        /// <param name="configuration"></param>
        /// <param name="context"></param>
        /// <param name="repositories"></param>
        public XDatabaseDescriptor(
            string name,
            IList<XRepositoryDescriptor> repositories = null
        ) : base(
            name: name,
            repositories: repositories
        )
        {
            Context = typeof(TContext);
        }
    }
}