using System;
using System.Collections.Generic;

namespace OpenNest.Desktop.Rendering;

/// <summary>
/// One plate view's View menu toggles, with the WinForms defaults: rapids off, bounds on, and
/// pierce points, offset outline, cut direction and support off. Only rapids and bounds are kept
/// between sessions, under the WinForms names <c>PlateViewDrawRapid</c> and <c>PlateViewDrawBounds</c>:
/// each nest view reads them when it opens and writes its own when it closes.
/// </summary>
public sealed class PlateViewOptions
{
    public const string DrawRapidName = "PlateViewDrawRapid";
    public const string DrawBoundsName = "PlateViewDrawBounds";

    /// <summary>The origin axes through world (0, 0).</summary>
    public bool DrawOrigin { get; set; } = true;

    public bool DrawRapid { get; set; }

    public bool DrawPiercePoints { get; set; }

    /// <summary>The box around the selected parts.</summary>
    public bool DrawBounds { get; set; } = true;

    /// <summary>Each part's outline offset by the plate's part spacing.</summary>
    public bool DrawOffset { get; set; }

    public bool DrawCutDirection { get; set; }

    /// <summary>The support bed, each part's contacts and center of gravity.</summary>
    public bool DrawSupport { get; set; }

    /// <summary>The chord tolerance of the offset outline.</summary>
    public double OffsetTolerance { get; set; } = 0.001;

    /// <summary>A view's toggles with the saved rapids and bounds; missing or unreadable values are defaults.</summary>
    public static PlateViewOptions Read(IReadOnlyDictionary<string, string> settings)
    {
        ArgumentNullException.ThrowIfNull(settings);
        var options = new PlateViewOptions();
        options.DrawRapid = UserSettingText.ReadBool(settings, DrawRapidName, options.DrawRapid);
        options.DrawBounds = UserSettingText.ReadBool(settings, DrawBoundsName, options.DrawBounds);
        return options;
    }

    /// <summary>
    /// Stores the rapids and bounds toggles in the WinForms format. As the WinForms settings
    /// provider does, a toggle still at its default is left out unless the file already holds it,
    /// so a later default change still applies.
    /// </summary>
    public void WriteTo(IDictionary<string, string> settings)
    {
        ArgumentNullException.ThrowIfNull(settings);
        var defaults = new PlateViewOptions();
        Write(settings, DrawRapidName, DrawRapid, defaults.DrawRapid);
        Write(settings, DrawBoundsName, DrawBounds, defaults.DrawBounds);
    }

    private static void Write(IDictionary<string, string> settings, string name, bool value, bool fallback)
    {
        if (value != fallback || settings.ContainsKey(name))
            settings[name] = UserSettingText.Format(value);
    }
}