using System;
using System.Linq;
using System.Threading.Tasks;
using MervisDb_GetTransformedData_Example.MervisDbService;
 
namespace MervisDb_GetTransformedData_Example
{
	class Program
	{
		static void Main(string[] args)
		{
			//
			// Demo of asynchronous method.
			//
			var task = Task.Run(async () =>
			{
				//
				// Create access to the real server.
				// Without SSL connections, you have to remove binding parameters "<security mode="Transport"/>" in the App.config.
				// The client is automatically generated from the WSDL file available here: https://kb.mervis.info/doku.php/en:mervis-db:10-api
				//
				using (HistoryDbAccessClient client = new HistoryDbAccessClient("HistoryAccess", "http://db.unipi.technology/dbaccess"))
				{
					// Authentication credentials in the database.
					Credentials credentials = new Credentials { Name = "XXXXX", Password = "YYYYY" };
 
					// Specification of the variables through Key-Value.
					// Here we use 2 variables.
					KeyValuePair[][] variableKeys = new KeyValuePair[][] {
						new KeyValuePair[] {
							new KeyValuePair (false, /*Key*/ "DPGuid", /*Value*/ "338E2882-D72B-4D17-A241-73E8BC30F458"),
							new KeyValuePair (false, /*Key*/ "StationName", /*Value*/ "AAABBB")
						},
						new KeyValuePair[] {
							new KeyValuePair (false, /*Key*/ "DPGuid", /*Value*/ "CC80211D-3D29-4CC2-91A2-F69483D566B5"),
							new KeyValuePair (false, /*Key*/ "StationName", /*Value*/ "AAABBB")
						}
					};
 
					// Aggregation request
					var aggregation = new AggregationRequest();
					aggregation.Types = new AggregationType[] { AggregationType.Last };
					aggregation.Interpolation = InterpolationType.None;
					//aggregation.MaxNeighborDistance = ..only for interpolation;
					aggregation.IsoPattern = new string[] { "PT15M" }; // 15 min period (ISO 8601 duration pattern)
					aggregation.From = new DateTime(2018, 11, 24, 0, 0, 0, 0, DateTimeKind.Unspecified);
					aggregation.To =   new DateTime(2018, 11, 25, 0, 0, 0, 0, DateTimeKind.Unspecified);
					aggregation.TimeZone = @"Europe/Prague";
 
					// Retrieving the data goes through cycling of intervals and variables. The server returns recommended intervals needed for the the next cycle.
					int variableOffset = 0; // the offset of the variable
					int variableCount = 10; // maximal number of variables returned in one request
					int intervalOffset;       // the offset of the interval
					int intervalCount = 1000; // maximal values in on request
 
					Console.WriteLine("Reading values...");
 
					do
					{
						intervalOffset = 0;
 
						do
						{
							// Execute the request.
							var result = await client.GetTransformedDataAsyncAsync(credentials, aggregation, variableKeys, variableOffset, variableCount, intervalOffset, intervalCount);
 
							// Check the return code. "0;OK" is what we want.
							if (!result.ReturnCode.StartsWith("0;"))
							{
								Console.WriteLine("Error on reading: {0}", result.ReturnCode);
							}
 
							// Cycle through the data and print it out.
							if (result.Data != null)
							{
								foreach (VariableAggregate vag in result.Data)
								{
									Console.WriteLine("Variable: {0}", String.Concat(vag.Keys.Select((i) => { return String.Format("{0}={1}; ", i.Key, i.Value); })));
 
									foreach (Interval value in vag.Data)
									{
										Console.Write(" {0}->{1} quality: {2:0.00} ", value.Begin, value.End, value.DataQuality);
 
										if (value.Last != null)
										{
											Console.Write(" Last Value: {0} (stamp {1}, origin {2})", value.Last.Value, value.Last.Stamp, value.Last.Origin);
										}
 
										Console.WriteLine();
									}
								}
							}
 
							variableOffset = result.NextVariableOffset;
							intervalOffset = result.NextIntervalOffset;
 
						} while (intervalOffset != -1);
 
					} while (variableOffset != -1);
				}
			});
 
			Console.WriteLine("DB communication is running in background");
 
			try
			{
				task.Wait();
			}
			catch (Exception exc)
			{
				Console.WriteLine("Exception: {0}", exc.ToString());
			}
 
			Console.WriteLine("DB communication finished");
 
			Console.ReadLine();
		}
 
	}
}