using System;
using System.Collections.Generic;
using System.Linq;
using MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Driver;

namespace Mongo.Test
{

	public class Person
	{
		public string Name { get; set; }
		public char Gender { get; set; }
		public override string ToString() => $@"{GetType().Name}: ({Gender}) {Name}";
	}


	public class Group
	{
		public ObjectId Id { get; set; } = new ObjectId();
		public string Name { get; set; }
		public List<Person> Members { get; set; }
		public override string ToString() => $@"{GetType().Name}: {Id}, Name: {Name}, Members: [{string.Join(", ", Members)}]";
	}


	class Program
	{
		static void Main()
		{
			var mongoUrl = MongoUrl.Create(@"mongodb://localhost:30000/test");
			var client = new MongoClient(mongoUrl);
			client.DropDatabase(mongoUrl.DatabaseName);
			var database = client.GetDatabase(mongoUrl.DatabaseName);
			var collection = database.GetCollection<Group>(nameof(Group));

			var group = new Group
			{
				Name = "Class A1",
				Members = new List<Person>
				{
					new Person { Name ="Lea", Gender = 'F' }
				}
			};
			collection.InsertOne(group);
			var result = collection.Find(g => g.Members.Any(p => p.Gender == 'F')).FirstOrDefault();
			Console.WriteLine(result); // #1: Document added perfectly

			group.Members.AddRange(new List<Person>
			{
				new Person { Name ="Linus", Gender = 'M' },
				new Person { Name ="Julius", Gender = 'M' }
			});
			UpdateMemebrs(collection, group.Id, group.Members); // #2: Document updated perfectly

			group.Members.Add(new Person { Name = "Martin", Gender = 'M' });

			// #3.1: Updating members using reflection to get property value...
			var propertyInfo = typeof(Group).GetProperty("Members");
			UpdateMemebrs(collection, group.Id, propertyInfo.GetValue(group)); // NOTE: the "Members" field is actually of type List<Person> but we are parsing <object>
																			   // #3.2: ...will "change" the document so find does not work

			UpdateMemebrs(collection, group.Id, group.Members.ToArray()); // #2: Document updated perfectly

			Console.ReadLine();
		}


		private static void UpdateMemebrs<TProp>(IMongoCollection<Group> collection, ObjectId groupId, TProp members)
		{
			var filter = Builders<Group>.Filter.Eq(p => p.Id, groupId);
			var update = Builders<Group>.Update.Set(nameof(Group.Members), members);
			Console.WriteLine(update.Render(BsonSerializer.LookupSerializer<Group>(), BsonSerializer.SerializerRegistry));
			collection.UpdateOne(filter, update);

			// Now, test that the update was good
			var result = collection.Find(g => g.Members.Any(p => p.Gender == 'F')).FirstOrDefault();
			Console.WriteLine(result?.ToString() ?? "Not Found");
		}
	}
}