using System;

namespace Vellum.Generator
{
    /// <summary>
    /// Describes a [Saveable] type as plain data: the shape its converter is written from, and what to check about it.
    /// They are kept apart so a change to the checks alone, such as a member moving down a line, doesn't rewrite the
    /// generated file.
    /// </summary>
    public sealed class SaveableModel : IEquatable<SaveableModel>
    {
        /// <summary>
        /// Holds the shape to write a converter from, or null if none is written.
        /// </summary>
        public readonly SaveableShape Shape;

        public readonly SaveableChecks Checks;

        public SaveableModel(SaveableShape shape, SaveableChecks checks)
        {
            Shape = shape;
            Checks = checks;
        }

        public bool Equals(SaveableModel other)
        {
            if (other == null || !Checks.Equals(other.Checks))
            {
                return false;
            }

            if (Shape == null)
            {
                return other.Shape == null;
            }

            return Shape.Equals(other.Shape);
        }

        public override bool Equals(object obj)
        {
            return Equals(obj as SaveableModel);
        }

        public override int GetHashCode()
        {
            return Checks.GetHashCode();
        }
    }
}