using System;
using Penumbra.GameData.Enums;
using Penumbra.GameData.Structs;

namespace Glamourer;

public readonly unsafe struct CharacterEquip
{
    public static readonly CharacterEquip Null = new(null);

    private readonly CharacterArmor* _armor;

    public IntPtr Address
        => (IntPtr)_armor;

    public ref CharacterArmor this[int idx]
        => ref _armor[idx];

    public ref CharacterArmor this[uint idx]
        => ref _armor[idx];

    public ref CharacterArmor this[EquipSlot slot]
        => ref _armor[IndexOf(slot)];


    public ref CharacterArmor Head
        => ref _armor[0];

    public ref CharacterArmor Body
        => ref _armor[1];

    public ref CharacterArmor Hands
        => ref _armor[2];

    public ref CharacterArmor Legs
        => ref _armor[3];

    public ref CharacterArmor Feet
        => ref _armor[4];

    public ref CharacterArmor Ears
        => ref _armor[5];

    public ref CharacterArmor Neck
        => ref _armor[6];

    public ref CharacterArmor Wrists
        => ref _armor[7];

    public ref CharacterArmor RFinger
        => ref _armor[8];

    public ref CharacterArmor LFinger
        => ref _armor[9];

    public CharacterEquip(CharacterArmor* val)
        => _armor = val;

    public static implicit operator CharacterEquip(CharacterArmor* val)
        => new(val);

    public static implicit operator CharacterEquip(IntPtr val)
        => new((CharacterArmor*)val);

    public static implicit operator CharacterEquip(ReadOnlySpan<CharacterArmor> val)
    {
        if (val.Length != 10)
            throw new ArgumentException("Invalid number of equipment pieces in span.");

        fixed (CharacterArmor* ptr = val)
        {
            return new CharacterEquip(ptr);
        }
    }

    public static implicit operator bool(CharacterEquip equip)
        => equip._armor != null;

    public static bool operator true(CharacterEquip equip)
        => equip._armor != null;

    public static bool operator false(CharacterEquip equip)
        => equip._armor == null;

    public static bool operator !(CharacterEquip equip)
        => equip._armor == null;

    private static int IndexOf(EquipSlot slot)
    {
        return slot switch
        {
            EquipSlot.Head    => 0,
            EquipSlot.Body    => 1,
            EquipSlot.Hands   => 2,
            EquipSlot.Legs    => 3,
            EquipSlot.Feet    => 4,
            EquipSlot.Ears    => 5,
            EquipSlot.Neck    => 6,
            EquipSlot.Wrists  => 7,
            EquipSlot.RFinger => 8,
            EquipSlot.LFinger => 9,
            _                 => throw new ArgumentOutOfRangeException(nameof(slot), slot, null),
        };
    }
}