using UnityEngine;

namespace Heroes.Battle
{
    /// <summary>
    /// Designer-authored unit prototype. An army slot references one of these
    /// plus a count; every combat stat lives here so balancing happens in the
    /// editor without touching code.
    /// </summary>
    [CreateAssetMenu(menuName = "Heroes/Battle/Unit", fileName = "Unit")]
    public sealed class UnitDefinition : ScriptableObject
    {
        [Tooltip("Stable identifier used in save data / configs. Leave empty to use asset name.")]
        public string id;

        [Tooltip("Human-readable name shown in UI. Leave empty to use asset name.")]
        public string displayName;

        [Tooltip("Battlefield sprite. Used only as a fallback when no 3D prefab is assigned.")]
        public Sprite sprite;

        [Tooltip("3D model prefab (with an Animator). When set, the battle view instantiates this " +
                 "instead of a sprite/placeholder. Its position stays 2D; only its rotation is driven " +
                 "through the virtual tilted plane.")]
        public GameObject prefab;

        [Header("Stats")]
        [Min(0)]
        public int attack = 1;

        [Min(0)]
        public int defense = 1;

        [Tooltip("Health of a single unit. A stack's total health is health * count.")]
        [Min(1)]
        public int health = 10;

        [Tooltip("Movement speed in hexes; also decides turn order (faster acts first).")]
        [Min(1)]
        public int speed = 5;

        [Tooltip("How many hexes wide the unit is (1 = normal, 2 = wide, e.g. cavalry or dragons).")]
        [Range(1, 2)]
        public int hexWidth = 1;

        public string ResolveId() => string.IsNullOrEmpty(id) ? name : id;

        public string ResolveDisplayName() => string.IsNullOrEmpty(displayName) ? name : displayName;
    }
}