using System;
using System.Collections.Generic;
using System.Linq;

namespace AsbCloudInfrastructure.Services.Subsystems.Utils
{
#nullable enable
    internal class DepthInterpolation
    {
        private List<(DateTimeOffset dateMin, float depthMin, DateTimeOffset dateMax, float depthMax)> collection;
        (DateTimeOffset x, float y) lastValue = default;
        public DepthInterpolation(List<(DateTimeOffset dateMin, float depthMin, DateTimeOffset dateMax, float depthMax)> collection)
        {
             this.collection = collection;             
        }

        public float GetDepth(DateTimeOffset date)
        {   
            for (int i = 0; i < collection.Count; i++)
            {
                if (date <= collection[i].dateMax && date >= collection[i].dateMin)
                {
                    lastValue.x = date;
                    lastValue.y = CalcValue(collection[i], (date - collection[i].dateMin).TotalSeconds);
                }
            }
            return lastValue.y;
        }
        
        private float CalcValue((DateTimeOffset dateMin, float depthMin, DateTimeOffset dateMax, float depthMax) item, double timestamp)
        {
            if (item.depthMin == item.depthMax)
            {
                return item.depthMin;
            }
            var w = timestamp / (item.dateMax - item.dateMin).TotalSeconds;
            var d = ((item.depthMax - item.depthMin) * w) + item.depthMin;
            return (float)d;
        }
    }
#nullable disable
}