using System;
using System.Threading.Tasks;
using Api.Models;
using HN.Application;
using HN.Domain;
using MediatR;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace Api.Controllers
{
  [ApiController]
  [Route("api/[controller]")]
  public sealed class LinksController : ControllerBase
  {
    private readonly IMediator _bus;

    public LinksController(IMediator bus)
    {
      _bus = bus;
    }

    /// <summary>
    /// Récupère tous les liens postés.
    /// </summary>
    /// <returns></returns>
    [ProducesResponseType(typeof(LinkDto[]), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    public async Task<IActionResult> GetLinks()
    {
      return Ok(await _bus.Send(new ListLinksQuery()));
    }

    /// <summary>
    /// Récupère um lien particulier.
    /// </summary>
    /// <param name="id"></param>
    [HttpGet("{id}")]
    public async Task<ActionResult<LinkDto>> GetLinkById(Guid id)
    {
      return Ok(await _bus.Send(new GetLinkQuery(id)));
    }

    /// <summary>
    /// Upvote un lien particulier.
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    [HttpPut("{id}/upvote")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    public async Task<IActionResult> Upvote(Guid id)
    {
      await _bus.Send(new VoteForLinkCommand(id, VoteType.Up));
      return NoContent();
    }

    /// <summary>
    /// Downvote un lien particulier.
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    [HttpPut("{id}/downvote")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    public async Task<IActionResult> Downvote(Guid id)
    {
      await _bus.Send(new VoteForLinkCommand(id, VoteType.Down));
      return NoContent();
    }

    /// <summary>
    /// Récupère les commentaires d'un lien particulier.
    /// </summary>
    /// <param name="id"></param>
    /// <returns></returns>
    [HttpGet("{id}/comments")]
    public async Task<ActionResult<CommentDto[]>> Comments(Guid id)
    {
      return Ok(await _bus.Send(new GetLinkCommentsQuery(id)));
    }

    /// <summary>
    /// Poste un nouveau commentaire sur un lien.
    /// </summary>
    /// <param name="id"></param>
    /// <param name="command"></param>
    /// <returns></returns>
    [HttpPost("{id}/comments")]
    [ProducesResponseType(StatusCodes.Status201Created)]
    public async Task<IActionResult> AddComment(Guid id, AddCommentViewModel command)
    {
      var commentId = await _bus.Send(new CommentLinkCommand(id, command.Content));
      return CreatedAtAction("", "", new { id = commentId }, null);
    }

    /// <summary>
    /// Poste un nouveau lien.
    /// </summary>
    /// <param name="command"></param>
    /// <returns></returns>
    [HttpPost]
    public async Task<IActionResult> CreateLink(AddLinkCommand command)
    {
      var result = await _bus.Send(command);

      return CreatedAtAction(nameof(GetLinkById), new { id = result });
    }
  }
}