using Godot;
using Theriapolis.Core;

namespace Theriapolis.GodotHost.Rendering;

/// <summary>
/// Player marker — small dot with a thin facing tick. Drawn at
/// <see cref="C.PLAYER_MARKER_SCREEN_PX"/>/2 wp; the owner sets
/// <see cref="Node2D.Scale"/> = 1/zoom every frame so the on-screen size
/// stays constant across the seamless zoom range.
///
/// Mirrors the MonoGame PlayerSprite's visual vocabulary — dark outline,
/// faction-red fill, optional facing tick. Phase-7-styled `PlayerSprite`
/// proper (walking animation frames) lands later.
/// </summary>
public partial class PlayerMarker : Node2D
{
    private const float RadiusWorldPx = C.PLAYER_MARKER_SCREEN_PX * 0.5f;
    private const float FacingTickPx  = RadiusWorldPx * 1.4f;

    /// <summary>Facing direction in radians; 0 = +X. Drives the optional
    /// tick rendered on the body's leading edge.</summary>
    public float FacingAngleRad { get; set; }

    /// <summary>When true, draws a small tick at the leading edge so the
    /// player can read facing without a full sprite. Hidden at low zoom
    /// to avoid clutter.</summary>
    public bool ShowFacingTick { get; set; } = true;

    public override void _Draw()
    {
        DrawCircle(Vector2.Zero, RadiusWorldPx, new Color(0, 0, 0, 0.78f));
        DrawCircle(Vector2.Zero, RadiusWorldPx * 0.85f, new Color(0.86f, 0.31f, 0.24f));

        if (ShowFacingTick)
        {
            var dir = new Vector2(Mathf.Cos(FacingAngleRad), Mathf.Sin(FacingAngleRad));
            DrawLine(dir * (RadiusWorldPx * 0.4f), dir * FacingTickPx,
                new Color(1f, 0.96f, 0.86f), width: RadiusWorldPx * 0.18f, antialiased: false);
        }
    }
}