using HC_APTBS.Models;
using SkiaSharp;

namespace HC_APTBS.ViewModels
{
    /// <summary>
    /// Container ViewModel holding two real-time flowmeter charts:
    /// one for Q-Delivery and one for Q-Over.
    /// </summary>
    public sealed class FlowmeterChartViewModel
    {
        /// <summary>Chart for the Q-Delivery flowmeter (amber line).</summary>
        public SingleFlowChartViewModel Delivery { get; }
            = new("Q-Delivery", new SKColor(0xFF, 0xAE, 0x00));

        /// <summary>Chart for the Q-Over flowmeter (blue line).</summary>
        public SingleFlowChartViewModel Over { get; }
            = new("Q-Over", new SKColor(0x40, 0x80, 0xFF));

        /// <summary>
        /// Appends a sample pair to both charts.
        /// Must be called on the UI thread.
        /// </summary>
        public void AddSamples(double qDelivery, double qOver)
        {
            Delivery.AddValue(qDelivery);
            Over.AddValue(qOver);
        }

        /// <summary>
        /// Sets the tolerance band on the appropriate chart.
        /// </summary>
        /// <param name="paramName">Parameter name (use <see cref="BenchParameterNames"/>).</param>
        /// <param name="target">Center value.</param>
        /// <param name="tolerance">Half-width.</param>
        public void SetTolerance(string paramName, double target, double tolerance)
        {
            if (paramName == BenchParameterNames.QDelivery)
                Delivery.SetTolerance(target, tolerance);
            else if (paramName == BenchParameterNames.QOver)
                Over.SetTolerance(target, tolerance);
        }

        /// <summary>Clears both charts.</summary>
        public void Clear()
        {
            Delivery.Clear();
            Over.Clear();
        }
    }
}