pkNX/pkNX.WinForms/Subforms/ShinyRate.cs

using System;
using System.Windows.Forms;
using pkNX.Game;

namespace pkNX.WinForms;

public sealed partial class ShinyRate : Form
{
    private readonly ShinyRateInfo Data;
    private readonly bool Loaded;

    public ShinyRate(ShinyRateInfo info)
    {
        InitializeComponent();
        Data = info;
        // load initial state
        RB_Always.Enabled = Data.AllowAlways;
        if (Data.IsFixed)
        {
            RB_Fixed.Checked = true;
            NUD_Rerolls.Value = Data.GetFixedRate();
        }
        if (Data.IsAlways)
            RB_Always.Checked = true;
        if (Data.IsDefault)
            RB_Default.Checked = true;

        // force update labels
        ChangePercent(this, EventArgs.Empty);
        ChangeRerollCount(this, EventArgs.Empty);
        Loaded = true;
    }

    public bool Modified { get; set; }

    private void B_Save_Click(object sender, EventArgs e)
    {
        Modified = true;
        Close();
    }

    private void ChangeSelection(object sender, EventArgs e)
    {
        GB_Rerolls.Enabled = GB_RerollHelper.Enabled = sender == RB_Fixed;
        if (!Loaded)
            return;
        if (sender == RB_Default)
            Data.SetDefault();
        else if (sender == RB_Always)
            Data.SetAlwaysShiny();
        else
            Data.SetFixedRate((int)NUD_Rerolls.Value);
    }

    private void ChangeRerollCount(object sender, EventArgs e)
    {
        if (Loaded && RB_Fixed.Checked)
            Data.SetFixedRate((int)NUD_Rerolls.Value);

        int count = (int)NUD_Rerolls.Value;
        const int bc = 4096;
        var pct = 1 - Math.Pow((float)(bc - 1) / bc, count);
        L_Overall.Text = $"~{pct:P}";
    }

    private void ChangePercent(object sender, EventArgs e)
    {
        var pct = NUD_Rate.Value;
        const int bc = 4096;

        var inv = (int)Math.Log(1 - ((float)pct / 100), (float)(bc - 1) / bc);
        if (pct == 0)
            pct = 0.00001m; // arbitrary nonzero
        L_RerollCount.Text = $"Count: {inv:0} = 1:{(int)(1 / (pct / 100))}";
    }
}