namespace Minecraft.Server.FourKit.Inventory.Meta;

/// <summary>
/// Represents the metadata of an <see cref="ItemStack"/>, including display name and lore.
/// </summary>
public class ItemMeta
{
    private string? _displayName;
    private List<string>? _lore;

    /// <summary>
    /// Checks for existence of a display name.
    /// </summary>
    /// <returns>true if this has a display name.</returns>
    public bool hasDisplayName() => _displayName != null;

    /// <summary>
    /// Gets the display name that is set.
    /// Plugins should check that hasDisplayName() returns true before calling this method.
    /// </summary>
    /// <returns>The display name that is set.</returns>
    public string getDisplayName() => _displayName ?? string.Empty;

    /// <summary>
    /// Sets the display name.
    /// </summary>
    /// <param name="name">The name to set.</param>
    public void setDisplayName(string? name) => _displayName = name;

    /// <summary>
    /// Checks for existence of lore.
    /// </summary>
    /// <returns>true if this has lore.</returns>
    public bool hasLore() => _lore != null && _lore.Count > 0;

    /// <summary>
    /// Gets the lore that is set.
    /// Plugins should check if hasLore() returns true before calling this method.
    /// </summary>
    /// <returns>A list of lore that is set.</returns>
    public List<string> getLore() => _lore != null ? new List<string>(_lore) : new List<string>();

    /// <summary>
    /// Sets the lore for this item. Removes lore when given null.
    /// </summary>
    /// <param name="lore">The lore that will be set.</param>
    public void setLore(List<string>? lore)
    {
        _lore = lore != null ? new List<string>(lore) : null;
    }

    public ItemMeta clone()
    {
        var copy = new ItemMeta();
        copy._displayName = _displayName;
        copy._lore = _lore != null ? new List<string>(_lore) : null;
        return copy;
    }

    internal bool isEmpty()
    {
        return _displayName == null && (_lore == null || _lore.Count == 0);
    }
}