using Mapster;
using Microsoft.EntityFrameworkCore;
using Persistence.Database.Model;
using Persistence.Models;
using Persistence.Repositories;

namespace Persistence.Repository.Repositories
{
	public class SetpointRepository : ISetpointRepository
	{
		private DbContext db;
		public SetpointRepository(DbContext db)
		{
			this.db = db;
		}

		protected virtual IQueryable<Setpoint> GetQueryReadOnly() => db.Set<Setpoint>();

		public async Task<IEnumerable<SetpointValueDto>> GetCurrent(IEnumerable<Guid> setpointKeys, CancellationToken token)
		{
			var query = GetQueryReadOnly();
			var entities = await query
				.Where(e => setpointKeys.Contains(e.Key))
				.ToArrayAsync(token);
			var dtos = entities.Select(e => e.Adapt<SetpointValueDto>());

			return dtos;
		}

		public async Task<IEnumerable<SetpointValueDto>> GetHistory(IEnumerable<Guid> setpointKeys, DateTimeOffset historyMoment, CancellationToken token)
		{
			var query = GetQueryReadOnly();
			var entities = await query
				.Where(e => setpointKeys.Contains(e.Key))
				.ToArrayAsync(token);
			var filteredEntities = entities
				.GroupBy(e => e.Key)
				.Select(e => e.Where(e => e.Created <= historyMoment).Last());
			var dtos = filteredEntities
				.Select(e => e.Adapt<SetpointValueDto>());

			return dtos;
		}

		public async Task<Dictionary<Guid, IEnumerable<SetpointLogDto>>> GetLog(IEnumerable<Guid> setpointKeys, CancellationToken token)
		{
			var query = GetQueryReadOnly();
			var entities = await query
				.Where(e => setpointKeys.Contains(e.Key))
				.ToArrayAsync(token);
			var dtos = entities
				.GroupBy(e => e.Key)
				.ToDictionary(e => e.Key, v => v.Select(z => z.Adapt<SetpointLogDto>()));

			return dtos;
		}

		public async Task Save(Guid setpointKey, object newValue, int idUser, CancellationToken token)
		{
			var entity = new Setpoint()
			{
				Key = setpointKey,
				Value = newValue,
				IdUser = idUser,
				Created = DateTimeOffset.UtcNow
			};

			await db.Set<Setpoint>().AddAsync(entity, token);
			await db.SaveChangesAsync(token);
		}
	}
}