using System;
using Microsoft.EntityFrameworkCore;
using Teams.DbContexts;
using Teams.Entities;

namespace Teams.Services
{
	public class TeamsRepository : ITeamsRepository
	{
		private readonly MlbGameDayContext _context;

		public TeamsRepository(MlbGameDayContext context)
		{
			_context = context ?? throw new ArgumentNullException(nameof(context));
		}

		public async Task<Team?> GetTeamAsync(int teamId)
		{
			return await _context.Teams.Where(t => t.Id == teamId).FirstOrDefaultAsync();
		}

		public async Task<(IEnumerable<Team>, PaginationMetadata)> GetTeamsAsync(int pageNumber, int pageSize)
		{
			var collection = _context.Teams as IQueryable<Team>;
			var totalItemCount = await collection.CountAsync();
			var paginationMetadata = new PaginationMetadata(totalItemCount, pageSize, pageNumber);
			var collectionToReturn = await collection.OrderBy(t => t.Name)
				.Skip(pageSize * (pageNumber - 1))
				.Take(pageSize)
				.ToListAsync();

			return (collectionToReturn, paginationMetadata);
		}
	}
}