namespace Minint.Core.Models;

/// <summary>
/// A single raster layer. Pixels are indices into the parent document's palette.
/// Array layout is row-major: Pixels[y * width + x].
/// </summary>
public sealed class MinintLayer
{
    public string Name { get; set; }
    public bool IsVisible { get; set; }

    /// <summary>
    /// Per-layer opacity (0 = fully transparent, 255 = fully opaque).
    /// Used during compositing: effective alpha = paletteColor.A * Opacity / 255.
    /// </summary>
    public byte Opacity { get; set; }

    /// <summary>
    /// Palette indices, length must equal container Width * Height.
    /// Index 0 = transparent by convention.
    /// </summary>
    public int[] Pixels { get; }

    public MinintLayer(string name, int pixelCount)
    {
        Name = name;
        IsVisible = true;
        Opacity = 255;
        Pixels = new int[pixelCount];
    }

    /// <summary>
    /// Constructor for deserialization — accepts a pre-filled pixel buffer.
    /// </summary>
    public MinintLayer(string name, bool isVisible, byte opacity, int[] pixels)
    {
        Name = name;
        IsVisible = isVisible;
        Opacity = opacity;
        Pixels = pixels;
    }
}