using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Yavsc.Models;
using Yavsc.Models.Blog;

namespace Yavsc.ViewComponents
{
    public class BlogIndexViewComponent: ViewComponent
    {
        private readonly ApplicationDbContext _context;

        public BlogIndexViewComponent(
            ApplicationDbContext context)
        {
            _context = context;
        }

        // Renders blog index ofr the specified user by name,
        // grouped by title
        public async Task<IViewComponentResult> InvokeAsync(string viewerId, int skip=0, int maxLen=25)
        {
            long[] usercircles = await _context.Circle.Include(c=>c.Members).
            Where(c=>c.Members.Any(m=>m.MemberId == viewerId))
            .Select(c=>c.Id).ToArrayAsync();

            var allposts = _context.Blogspot
                .Include(b => b.Author)
                .Include(p=>p.ACL)
                .Include(p=>p.Tags)
                .Include(p=>p.Comments)
                .Where(p => p.AuthorId == viewerId || p.Visible).ToArray();

            IEnumerable<BlogPost> posts = (usercircles != null) ? 
                allposts.Where(p=> p.ACL.Count==0 || p.ACL.Any(a => usercircles.Contains(a.CircleId)))
                : allposts.Where(p => p.ACL.Count == 0);

            var data = posts.OrderByDescending( p=> p.DateCreated);
            var grouped = data.GroupBy(p=> p.Title).Skip(skip).Take(maxLen);

            return View("Default", grouped);
        }
    }
}