using AsbCloudDb.Model;
using System;
using System.Collections.Generic;
using System.Linq;

namespace AsbCloudInfrastructure.Services.DetectOperations.Detectors
{
    internal class OperationDetector : IOperationDetector
    {
        private readonly int idOperation;

        protected Func<DetectableTelemetry[], bool> isValid = (_) => true;

        protected Func<DetectableTelemetry[], double> calcValue = (_) => 0d;

        public OperationDetector(int idOperation)
        {
            this.idOperation = idOperation;
        }

        public bool TryDetect(int idTelemetry, DetectableTelemetry[] telemetryFragment, out IEnumerable<DetectedOperation> operations)
        {
            if(!telemetryFragment.Any() || !isValid(telemetryFragment))
            {
                operations = Enumerable.Empty<DetectedOperation>();
                return false;
            }

            var operation = MakeOperation(idTelemetry, telemetryFragment);

            operations = new List<DetectedOperation> { operation };

            return true;
        }

        private DetectedOperation MakeOperation(int idTelemetry, DetectableTelemetry[] telemetryFragment)
        {
            var pBegin = telemetryFragment.First();
            var pEnd = telemetryFragment.Last();
            var operation = new DetectedOperation
            {
                IdTelemetry = idTelemetry,
                IdCategory = idOperation,
                IdUsersAtStart = pBegin.IdUser ?? -1,
                DateStart = pBegin.DateTime,
                DateEnd = pEnd.DateTime,
                DepthStart = (double)pBegin.WellDepth,
                DepthEnd = (double)pEnd.WellDepth,
                Value = calcValue(telemetryFragment),
            };
            return operation;
        }

        public OperationDetector SetIsValidDelegate(Func<DetectableTelemetry[], bool> isValid)
        {
            this.isValid = isValid;
            return this;
        }

        public OperationDetector SetCalcValueDelegate(Func<DetectableTelemetry[], double> calcValue)
        {
            this.calcValue = calcValue;
            return this;
        }
    }
}