using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using Snootalogue.Data;
using System.Runtime;

namespace Snootalogue.Models {
	public class Document {
		public string ID { get; set; }
		public string Filename { get; set; }
		public string Hash { get; set; }
		[UIHint("FileSize")]
		public long Size { get; set; }

		public string Title { get; set; }
		[UIHint("CommaSeparatedList")]
		public List<string> Authors { get; set; }
		public string Category { get; set; }
		[Display(Name = "Date added")]
		public DateTime DateAdded { get; set; }
		[UIHint("CommaSeparatedList")]
		public List<string> Tags { get; set; }
		public Boolean Read { get; set; }
		public string Notes { get; set; }

		public static string NewID(SnootalogueContext context) {
			// - no vowels to avoid (most) (non-welsh) naughty words
			// - no l1I because it's always confusing
			// - no 0
			string idCharacters = "bcdfghjkmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ23456789";
			var rng = new Random();
			var collision = true;
			string id = "";
			while (collision) {
				id = "";
				for (var i = 0; i < 7; i++) {
					id += idCharacters[rng.Next(idCharacters.Length)];
				}
				collision = context.Document.Find(id) != null;
			}

			return id;
		}
	}
}