using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using MongoDB.Driver;
using Retroactiune.Models;
using Retroactiune.Settings;

namespace Retroactiune.Services
{
    /// <summary>
    /// Service that simplifies access to the database for managing FeedbackReceiver items.
    /// <see cref="FeedbackReceiver"/>
    /// </summary>
    public class FeedbackReceiverService : IFeedbackReceiverService
    {
        private readonly IMongoCollection<FeedbackReceiver> _collection;

        public FeedbackReceiverService(IMongoClient client, IMongoDbSettings settings)
        {
            var database = client.GetDatabase(settings.DatabaseName);
            _collection = database.GetCollection<FeedbackReceiver>(settings.FeedbackReceiverCollectionName);
        }

        public async Task CreateManyAsync(IEnumerable<FeedbackReceiver> items)
        {
            if (items == null)
            {
                throw new ArgumentNullException(nameof(items));
            }

            if (!items.Any())
            {
                throw new GenericServiceException("items must contain at least one element");
            }

            try
            {
                await _collection.InsertManyAsync(items);
            }
            catch (Exception e)
            {
                throw new GenericServiceException($"Operation failed: {e.Message}");
            }
        }

        public async Task DeleteOneAsync(string guid)
        {
            try
            {
                var filter = new FilterDefinitionBuilder<FeedbackReceiver>();
                await _collection.DeleteOneAsync(filter.Eq(i => i.Id, guid));
            }
            catch (Exception e)
            {
                throw new GenericServiceException($"Operation failed: {e.Message}");
            }
        }

        public async Task<IEnumerable<FeedbackReceiver>> FindAsync(IEnumerable<string> guids)
        {
            try
            {
                var filter = new FilterDefinitionBuilder<FeedbackReceiver>();

                var cursor = await _collection.FindAsync(filter.In(i => i.Id, guids));
                return cursor.ToList();
            }
            catch (Exception e)
            {
                throw new GenericServiceException($"Operation failed: {e.Message}");
            }
        }
    }
}