using System.Diagnostics.CodeAnalysis;
using PkmnLib.Static.Species;
using PkmnLib.Static.Utils;

namespace PkmnLib.Static.Libraries;

/// <summary>
/// The library for all species in the game.
/// </summary>
public interface IReadOnlySpeciesLibrary : IEnumerable<ISpecies>
{
    /// <summary>
    /// Tries to get a species from the library. Returns false if the species is not found.
    /// </summary>
    bool TryGet(StringKey key, [MaybeNullWhen(false)] out ISpecies value);
    bool TryGetById(int id, [MaybeNullWhen(false)] out ISpecies value);

    /// <summary>
    /// Gets a random species from the library.
    /// </summary>
    ISpecies GetRandom(IRandom random);

    /// <summary>
    /// The amount of species in the library.
    /// </summary>
    int Count { get; }

    /// <summary>
    /// Whether the library is empty.
    /// </summary>
    bool IsEmpty { get; }
}

/// <inheritdoc cref="IReadOnlySpeciesLibrary"/>
public class SpeciesLibrary : DataLibrary<ISpecies>, IReadOnlySpeciesLibrary
{
    /// <inheritdoc />
    public bool TryGetById(int id, [MaybeNullWhen(false)] out ISpecies value)
    {
        return this.FirstOrDefault(s => s.Id == id) is { } species
            ? (value = species) != null
            : (value = default) != null;
    }
}