using MinecraftDiscordBot.Models;

namespace MinecraftDiscordBot;

public abstract class ItemFilter {
    public abstract bool Match(Fluid item);
    public virtual bool MatchItem(Item item) => Match(item);

    public static ItemFilter Parse(string filter)
        => filter.StartsWith('@')
            ? new ModNameFilter(filter[1..])
            : filter.StartsWith('$')
            ? new TagFilter(filter[1..])
            : new ItemNameFilter(filter);

    private class ModNameFilter : ItemFilter {
        private readonly string filter;
        public ModNameFilter(string filter) => this.filter = filter;
        public override bool Match(Fluid item) => item.ItemId.ModName.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
    }

    private class TagFilter : ItemFilter {
        private readonly string filter;
        public TagFilter(string filter) => this.filter = filter;
        public override bool Match(Fluid item)
            => item.Tags?.Any(tag => tag.Contains(filter, StringComparison.InvariantCultureIgnoreCase)) ?? false;
    }

    private class ItemNameFilter : ItemFilter {
        private readonly string filter;
        public ItemNameFilter(string filter) => this.filter = filter;
        public override bool Match(Fluid item) => item.DisplayName.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
    }
}