using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AIUtils {
    public static BattleHero GetNearestHero(MonsterViewpoint viewpoint,
            BattleParticipant owner) {
        int ownerPosition = GetMonsterPosition(viewpoint, owner);

        int nearestHeroIndex = -1;
        int nearestDistance = int.MaxValue;
        for (int i = 0; i < viewpoint.Heroes.Length; i++) {
            if (!viewpoint.Heroes[i].IsAlive()) continue;
            int distance = System.Math.Abs(i - ownerPosition);
            if (distance < nearestDistance) {
                nearestHeroIndex = i;
                nearestDistance = distance;
            }
        }
        return HeroAtIndex(nearestHeroIndex, viewpoint);
    }

    public static BattleHero GetFarthestHero(MonsterViewpoint viewpoint,
            BattleParticipant owner) {
        int ownerPosition = GetMonsterPosition(viewpoint, owner);

        int farthestHeroIndex = -1;
        int farthestDistance = -1;
        for (int i = 0; i < viewpoint.Heroes.Length; i++) {
            if (!viewpoint.Heroes[i].IsAlive()) continue;
            int distance = System.Math.Abs(i - ownerPosition);
            if (distance > farthestDistance) {
                farthestHeroIndex = i;
                farthestDistance = distance;
            }
        }
        return HeroAtIndex(farthestHeroIndex, viewpoint);
    }

    private static int GetMonsterPosition(MonsterViewpoint viewpoint, BattleParticipant monster) {
        for (int i = 0; i < viewpoint.Monsters.Length; i++) {
            if (viewpoint.Monsters[i] == monster) return i;
        }
        return -1;
    }

    public static BattleHero GetHeroWithHighestHP(MonsterViewpoint viewpoint) {
        int highestHPHeroIndex = -1;
        int highestHP = -1;
        for (int i = 0; i < viewpoint.Heroes.Length; i++) {
            if (!viewpoint.Heroes[i].IsAlive()) continue;
            int heroHP = viewpoint.Heroes[i].GetHP();
            if (heroHP > highestHP) {
                highestHPHeroIndex = i;
                highestHP = heroHP;
            }
        }
        return HeroAtIndex(highestHPHeroIndex, viewpoint);
    }

    private static BattleHero HeroAtIndex(int index, MonsterViewpoint viewpoint) {
        if (index == -1) return null;
        return viewpoint.Heroes[index];
    }
}