common/Stichproben/Cordonel/StichprobenManager.cs

namespace Stichproben.Cordonel
{
    public class StichprobenManager
    {
        private readonly StichprobenDbContext stichprobenDb;

        public StichprobenManager(int leakStationId) 
            => this.stichprobenDb = new StichprobenDbContext(leakStationId);

        public StichprobeResult ShouldBePressureTested(int pcbId)
        {
            var isAnyUndicht = this.stichprobenDb.IsAnyStichprobeUndicht();
            var previousStichprobe = this.stichprobenDb.GetLastStichprobeOrDefault();

            if (previousStichprobe is null)
            {
                previousStichprobe = new Stichprobe();
            }

            var stichprobenRule = this.stichprobenDb.GetMinRule();
            var currentStichprobe = new Stichprobe
            {
                PcbId = pcbId
            };

            if (isAnyUndicht == false)
            {
                stichprobenRule = this.stichprobenDb.FindRuleOrMin(previousStichprobe.Prozentsatz);

                if (previousStichprobe.Nummer >= stichprobenRule.Count)
                {
                    stichprobenRule = this.stichprobenDb.GetNextRuleOrMin(previousStichprobe.Prozentsatz);
                }

                if (previousStichprobe.Nummer != 0)
                {
                    currentStichprobe.Nummer = previousStichprobe.Nummer + 1;
                }
            }
            else
            {
                stichprobenRule = this.stichprobenDb.GetMaxRule();
            }
            
            var percent = stichprobenRule.Percent;
            var moduloDevider = 100 / percent;

            currentStichprobe.Prozentsatz = percent;
            currentStichprobe.IstStichprobe = currentStichprobe.Nummer % moduloDevider == 0;

            if (currentStichprobe.Nummer == 0)
            {
                currentStichprobe.Nummer = 1;
            }

            if (previousStichprobe.PcbId != currentStichprobe.PcbId)
            {
                this.stichprobenDb.AddStichprobe(currentStichprobe);
            }

            return new StichprobeResult(currentStichprobe.IstStichprobe, currentStichprobe.Nummer, stichprobenRule.Percent, stichprobenRule.Count);
        }
    }
}