using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

using PrivaPub.Api.Mastodon.Infrastructure;
using PrivaPub.Api.Mastodon.Mappers;
using PrivaPub.Domain.Privacy;
using PrivaPub.Domain.Statuses;
using PrivaPub.Models.Post;
using PrivaPub.StaticServices;

using PostEntity = PrivaPub.Models.Post.Post;

namespace PrivaPub.Api.Mastodon.Controllers
{
	public class PollsController : MastodonController
	{
		readonly DbEntities _dbEntities;
		readonly MastodonMapper _mapper;
		readonly IPollService _polls;

		public PollsController(DbEntities dbEntities, MastodonMapper mapper, IPollService polls)
		{
			_dbEntities = dbEntities;
			_mapper = mapper;
			_polls = polls;
		}

		[HttpGet("/api/v1/polls/{id}"), Scope("read:statuses", requiresUser: false), AllowAnonymous]
		public async Task<IActionResult> Get(string id, CancellationToken token)
		{
			var post = await Visible(id, token);
			return post?.Poll == default ? NotFoundError() : Json(_mapper.Poll(post, MyId, await _polls.OwnVotes(post.ID, MyId, token)));
		}

		[HttpPost("/api/v1/polls/{id}/votes"), Scope("write:statuses")]
		public async Task<IActionResult> Vote(string id, CancellationToken token)
		{
			var post = await Visible(id, token);
			if (post?.Poll == default)
				return NotFoundError();
			var choices = Params.List("choices").Select(c => int.TryParse(c, out var index) ? index : -1).ToList();
			var outcome = await _polls.Vote(Me, post, choices, token);
			if (!outcome.Ok)
				return Error(outcome.Status, outcome.Error);
			return Json(_mapper.Poll(outcome.Post, MyId, await _polls.OwnVotes(post.ID, MyId, token)));
		}

		async Task<PostEntity> Visible(string id, CancellationToken token)
		{
			var post = await _dbEntities.Posts.Match(p => p.ID == id && !p.DeletedAt.HasValue).ExecuteFirstAsync(token);
			return post != default && post.Visibility != PostVisibility.LocalGeo && await VisibilityPolicy.CanSee(post, MyId, token) ? post : default;
		}
	}
}