using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CDP
{
    public class GroupsDocument
    {
        public string id
        {
            get
            {
                return GenPartitionKey(AppKey, UserId, Index);
            }
        }
        public string AppKey { get; set; }
        public string UserId { get; set; }
        public int Index { get; set; }
        public List<GroupsRecord> Records { get; set; }

        public GroupsDocument()
        {
            Index = 0;
            Records = new List<GroupsRecord>();
        }

        public static string GenRootPartitionKey(string id, DateTime dt)
        {
            return string.Format($"{id}-{dt.Year}-{dt.DayOfYear}");
        }

        public static string GenPartitionKey(string appKey, string userId, int index = 0)
        {
            return string.Format($"{appKey}-{userId}-{index}");
        }
    }

    public class GroupsRecord
    {
        public string id { get; set; }
        public string Name { get; set; }
        public string Description { get; set; }
        public List<ContactRecord> Contacts { get; set; }
        public DateTime EventTime { get; set; }

        public GroupsRecord()
        {
            EventTime = DateTime.UtcNow;
        }

        public GroupsRecord(string name, string description, List<ContactRecord> contacts)
        {
            id = Guid.NewGuid().ToString();
            Name = name;
            Description = description;
            Contacts = contacts != null ? contacts : new List<ContactRecord>();
            EventTime = DateTime.UtcNow;
        }

        public int CalculateRecordSize()
        {
            int size = 0;

            size += 8800; // sizeof(DateTime);  175*50 = 8750 bytes to support at max 50 contacts in a group
            size += Encoding.UTF8.GetByteCount(Name) == 0 ? 20 : Encoding.UTF8.GetByteCount(Name);  // UserId                          
            size += sizeof(int);
            return size;
        }

    }
    public class MetadataDocumentGroups
    {
        public string id { get; set; }
        public List<string> PartitionKeys { get; set; }

        public MetadataDocumentGroups()
        {
            PartitionKeys = new List<string>();
            id = id + "-meta";
        }
        public string GetLatestKey(string appKey, string userId)
        {
            PartitionKeys.Sort();
            if (PartitionKeys.Count == 0)
                return GroupsDocument.GenPartitionKey(appKey, userId);

            return PartitionKeys.Last();
        }
    }

}