using EnVisage.MongoDbMigration.Data;
using EnVisage.MongoDbMigration.DataAccess;
using System;
using System.Collections.Generic;
using System.Linq;

namespace EnVisage.MongoDbMigration.Logic
{
    public class MigrationsManager : ManagerBase, IMigrationsManager
    {
        private bool _isTestMode = false;

        public MigrationsManager(MongoAccessorsContainer accessorsContainer, bool isTestMode)
            : base(accessorsContainer)
        {
            _isTestMode = isTestMode;
        }

        public void RunExecuters(List<IMigrationExecuterBase> executers)
        {
            if (executers == null)
                throw new ArgumentNullException("executers");

            if (executers.Count != executers.Select(x => x.Version).Distinct().Count())
                throw new ArgumentException("There are few migration executers wich have the same version");

            var completedMigrations = Accessors.MigrationAccessor.GetAll();
            var currentMigrations = new List<Migration>();

            foreach (var executer in executers.OrderBy(x => x.Version))
            {
                if (completedMigrations.Any(x => x.Version == executer.Version))
                    continue;

                executer.Execute();

                if (_isTestMode)
                    continue;

                currentMigrations.Add(new Migration()
                {
                    Version = executer.Version
                });
            }

            if (!_isTestMode && currentMigrations.Count > 0)
                Accessors.MigrationAccessor.Insert(currentMigrations);
        }
    }
}