using System;
using Kreta.Core.ConnectionType;
using Kreta.DataAccessManual.Interfaces;
using Kreta.Framework;

namespace Kreta.DataAccessManual.Util
{
    internal abstract class ConnectionHandlerBase
    {
        internal void ActionWithHandler(Action<IDalHandler> actions, IDalHandler handler = null)
        {
            try
            {
                var isNotNestedConnection = handler == null;
                handler = handler ?? new DalHandler();
                actions(handler);
                if (isNotNestedConnection && handler.CommitOnEnd)
                {
                    UserContext.Instance.CommitTransaction();
                }
            }
            catch
            {
                UserContext.Instance.RollbackTransaction();
                throw;
            }
        }

        internal T FunctionWithHandler<T>(Func<IDalHandler, T> actions, IDalHandler handler = null)
        {
            try
            {
                var isNotNestedConnection = handler == null;
                handler = handler ?? new DalHandler();
                var result = actions(handler);
                if (isNotNestedConnection && handler.CommitOnEnd)
                {
                    UserContext.Instance.CommitTransaction();
                }
                return result;
            }
            catch
            {
                UserContext.Instance.RollbackTransaction();
                throw;
            }
        }
    }

    internal class ConnectionHandler : ConnectionHandlerBase, IConnectionHandler
    {
        public void Run(string sessionId, Action<IDalHandler> actions)
        {
            using (new Connection(sessionId))
            {
                ActionWithHandler(actions);
            }
        }

        public T Run<T>(string sessionId, Func<IDalHandler, T> actions)
        {
            using (new Connection(sessionId))
            {
                return FunctionWithHandler(actions);
            }
        }
    }

    internal class OrganizationConnectionHandler : ConnectionHandlerBase, IOrganizationConnectionHandler
    {
        public void Run(string intezmenyAzonosito, Action<IDalHandler> actions)
        {
            using (new OrganizationConnection(intezmenyAzonosito))
            {
                ActionWithHandler(actions);
            }
        }

        public T Run<T>(string intezmenyAzonosito, Func<IDalHandler, T> actions)
        {
            using (new OrganizationConnection(intezmenyAzonosito))
            {
                return FunctionWithHandler(actions);
            }
        }
    }

    internal class MobileConnectionHandler : ConnectionHandlerBase, IMobileConnectionHandler
    {
        public void Run(string intezmenyAzonosito, int? tanevId, Action<IDalHandler> actions, int? felhasznaloId = null)
        {
            using (new MobileConnection(intezmenyAzonosito, tanevId, felhasznaloId))
            {
                ActionWithHandler(actions);
            }
        }

        public T Run<T>(string intezmenyAzonosito, int? tanevId, Func<IDalHandler, T> actions, int? felhasznaloId = null)
        {
            using (new MobileConnection(intezmenyAzonosito, tanevId, felhasznaloId))
            {
                return FunctionWithHandler(actions);
            }
        }
    }

    internal class SystemConnectionHandler : ConnectionHandlerBase, ISystemConnectionHandler
    {
        public void Run(Action<IDalHandler> actions)
        {
            using (new SystemConnection())
            {
                ActionWithHandler(actions);
            }
        }

        public T Run<T>(Func<IDalHandler, T> actions)
        {
            using (new SystemConnection())
            {
                return FunctionWithHandler(actions);
            }
        }
    }

    internal class ServiceSystemConnectionHandler : ConnectionHandlerBase, IServiceSystemConnectionHandler
    {
        public void Run(string connectionString, Action<IDalHandler> actions)
        {
            using (new ServiceSystemConnection(connectionString))
            {
                ActionWithHandler(actions);
            }
        }

        public T Run<T>(string connectionString, Func<IDalHandler, T> actions)
        {
            using (new ServiceSystemConnection(connectionString))
            {
                return FunctionWithHandler(actions);
            }
        }
    }

    internal class CustomConnectionHandler : ConnectionHandlerBase, ICustomConnectionHandler
    {
        public void Run(IConnectionType connectionType, Action<IDalHandler> actions)
        {
            switch (connectionType)
            {
                case DalHandlerConnectionType dalHandlerConnectionType:
                    ActionWithHandler(actions, dalHandlerConnectionType.DalHandler);
                    break;
                case MobileConnectionType mobileConnectionType:
                    new MobileConnectionHandler().Run(mobileConnectionType.IntezmenyAzonosito, mobileConnectionType.TanevId, actions, mobileConnectionType.FelhasznaloId);
                    break;
                case OrganizationConnectionType organizationConnectionType:
                    new OrganizationConnectionHandler().Run(organizationConnectionType.IntezmenyAzonosito, actions);
                    break;
                case SessionConnectionType sessionConnectionType:
                    new ConnectionHandler().Run(sessionConnectionType.SessionId, actions);
                    break;
                case SystemConnectionType systemConnectionType:
                    new SystemConnectionHandler().Run(actions);
                    break;
                default:
                    throw new ArgumentException("Ismeretlen ConnectionTpye", nameof(connectionType));
            }
        }

        public T Run<T>(IConnectionType connectionType, Func<IDalHandler, T> actions)
        {
            switch (connectionType)
            {
                case DalHandlerConnectionType dalHandlerConnectionType:
                    return FunctionWithHandler(actions, dalHandlerConnectionType.DalHandler);
                case MobileConnectionType mobileConnectionType:
                    return new MobileConnectionHandler().Run(mobileConnectionType.IntezmenyAzonosito, mobileConnectionType.TanevId, actions, mobileConnectionType.FelhasznaloId);
                case OrganizationConnectionType organizationConnectionType:
                    return new OrganizationConnectionHandler().Run(organizationConnectionType.IntezmenyAzonosito, actions);
                case SessionConnectionType sessionConnectionType:
                    return new ConnectionHandler().Run(sessionConnectionType.SessionId, actions);
                case SystemConnectionType systemConnectionType:
                    return new SystemConnectionHandler().Run(actions);
                default:
                    throw new ArgumentException("Ismeretlen ConnectionTpye", nameof(connectionType));
            }
        }
    }
}