using AsbCloudDb.Model.Subsystems;
using System;

namespace AsbCloudInfrastructure.Services.Subsystems
{
    public class SubsystemDetector
    {
        private readonly int idTelemetry;
        private readonly int idSubsystem;
        private readonly Func<short?, bool> isEnable;
        private readonly Func<SubsystemOperationTime, bool> isValid;
        (bool isEnable, DateTimeOffset date, float depth) pre = default;

        public SubsystemDetector(
           int idTelemetry,
           int idSubsystem,
           Func<short?, bool> isEnable,
           Func<SubsystemOperationTime, bool> isValid)
        {
            this.idTelemetry = idTelemetry;
            this.idSubsystem = idSubsystem;
            this.isEnable = isEnable;
            this.isValid = isValid;
        }

        public SubsystemOperationTime? Detect(short? mode, DateTimeOffset date, float depth)
        {
            var isEnable = this.isEnable(mode);

            if (!pre.isEnable && isEnable)
            {
                pre = (true, date, depth);
            }
            else if (pre.isEnable && !isEnable)
            {
                var subsystemOperationTime = new SubsystemOperationTime
                {
                    IdTelemetry = idTelemetry,
                    IdSubsystem = idSubsystem,
                    DateStart = pre.date,
                    DateEnd = date,
                    DepthStart = pre.depth,
                    DepthEnd = depth,
                };
                pre.isEnable = false;
                if (!isValid(subsystemOperationTime))
                    return null;

                return subsystemOperationTime;

            }
            return null;
        }
    }
}