namespace redis_parkhaus
{
    using System;
    using System.Collections.Generic;
    using System.Threading.Tasks;
    using StackExchange.Redis;

    class Program
    {
        static async Task Main(string[] args)
        {
            var redis = ConnectionMultiplexer.Connect("xxxxxx.redis.cache.windows.net:6380,password=XXXXXX,ssl=True,abortConnect=False");
            IDatabase cache = redis.GetDatabase();

            var bytes = new byte[10];

            var sensors = new Dictionary<string, int>
            {
                { "Sensor 001", 0 },
                { "Sensor 002", 1 },
                { "Sensor 003", 10 },
            };


            const string parkhaus2 = "Parkhaus 2";
            const string parkhaus3 = "Parkhaus 3";

            await cache.StringSetAsync(parkhaus2, new byte[10]);
            await cache.StringSetAsync(parkhaus3, new byte[10]);
            await cache.StringSetBitAsync(parkhaus2, sensors["Sensor 001"], true);
            await cache.StringSetBitAsync(parkhaus2, sensors["Sensor 002"], true);


            const string timeSlot1 = "2019-04-12 12:00-13:00";

            await cache.StringSetAsync(timeSlot1, bytes);
            await cache.ParkhouseUsed(sensors, "Sensor 001", timeSlot1);
            await cache.ParkhouseUsed(sensors, "Sensor 002", timeSlot1);

            var count = await cache.GetParkhouseUtilization(parkhaus2, timeSlot1);

            await Console.Out.WriteLineAsync($"{parkhaus2} in {timeSlot1}: {count}");
        }
    }

    public static class Utils
    {
        public static Task ParkhouseUsed(this IDatabase cache, Dictionary<string, int> sensorsIDs, string sensorName, string timeslot)
        {
            var sensorIndex = sensorsIDs[sensorName];
            return cache.StringSetBitAsync(timeslot, sensorIndex, true);
        }

        public static async Task<long> GetParkhouseUtilization(this IDatabase cache, string parkhouse, string timeslot)
        {
            var query = $"{parkhouse} {timeslot}";
            await cache.StringBitOperationAsync(Bitwise.And, query, timeslot, parkhouse);
            var count = await cache.StringBitCountAsync(query);
            await cache.KeyDeleteAsync(query);
            return count;
        }

        public static string AsHexString(this byte[] bytes) => BitConverter.ToString(bytes).Replace("-", "");

        public static byte[] HexStringToByteArray(this string hex)
        {
            int NumberChars = hex.Length;
            byte[] bytes = new byte[NumberChars / 2];
            for (int i = 0; i < NumberChars; i += 2)
                bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
            return bytes;
        }
    }
}