using Raven.Client.Documents.Session;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using zero.Core.Database;
using zero.Core.Entities;
using zero.Core.Extensions;
using zero.Core.Options;

namespace zero.Core.Routing
{
  public class PageLinkProvider : ILinkProvider
  {
    public const string AREA = "zero.pages";

    protected IRoutes Routes { get; set; }
    protected IZeroOptions Options { get; set; } 

    public PageLinkProvider(IRoutes routes, IZeroOptions options)
    {
      Routes = routes;
      Options = options;
    }


    /// <summary>
    /// Creates a new link object from a page
    /// </summary>
    public Link Create(Page page, LinkTarget target = LinkTarget.Default, string title = null)
    {
      return new Link()
      {
        Area = AREA,
        Target = target,
        Title = title,
        Values = new()
        {
          { "id", page.Id }
        }
      };
    }


    /// <inheritdoc />
    public bool CanProcess(Link link) => link.Area == AREA;


    /// <inheritdoc />
    public async Task<string> Resolve(Link link)
    {
      link.Url = await Routes.GetUrl<Page>(link.Values.GetValueOrDefault<string>("id")) + (link.UrlSuffix ?? string.Empty);
      return link.Url;
    }


    /// <inheritdoc />
    public async Task<PreviewModel> Preview(IAsyncDocumentSession session, Link link)
    {
      string id = link.Values.GetValueOrDefault<string>("id");

      if (id.IsNullOrEmpty())
      {
        return null;
      }

      Page page = await session.LoadAsync<Page>(id);

      if (page == null)
      {
        return null;
      }

      PageType pageType = Options.Pages.GetAllItems().FirstOrDefault(x => x.Alias == page.PageTypeAlias);

      string url = await Routes.GetUrl<Page>(page);

      return new()
      {
        Id = page.Id,
        Icon = pageType?.Icon ?? "fth-folder",
        Name = page.Name,
        Text = url
      };
    }
  }
}