using System.Collections.Generic;
using Cielonos.MainGame.Characters;

namespace Cielonos.MainGame.Inventory.Collections
{
    public partial class FutureWand
    {
        private const float DefaultTargetingRadius = 25f;
        private readonly List<Enemy> _currentTargets = new List<Enemy>(3);

        private IReadOnlyList<Enemy> CurrentTargets => _currentTargets;
        private Enemy PrimaryTarget => _currentTargets.Count > 0 ? _currentTargets[0] : null;

        private Enemy RefreshPrimaryTarget(float radius = DefaultTargetingRadius)
        {
            return RefreshPrimaryTarget(TargetingScorePreset.RangedAttack, radius);
        }

        private Enemy RefreshPrimaryTargetByMelee(float radius = DefaultTargetingRadius)
        {
            return RefreshPrimaryTarget(TargetingScorePreset.MeleeAttack, radius);
        }

        private Enemy RefreshPrimaryTarget(TargetingScorePreset preset, float radius = DefaultTargetingRadius)
        {
            RefreshCurrentTargets(1, radius, preset);
            return PrimaryTarget;
        }

        private IReadOnlyList<Enemy> RefreshCurrentTargets(int maxTargetCount, float radius = DefaultTargetingRadius,
            TargetingScorePreset preset = TargetingScorePreset.RangedAttack)
        {
            _currentTargets.Clear();
            if (maxTargetCount <= 0) return CurrentTargets;

            Enemy firstTarget = CombatManager.EnemySm.Query(radius, preset).LockonFirst();
            if (firstTarget != null)
            {
                _currentTargets.Add(firstTarget);
            }

            int remainingCount = maxTargetCount - _currentTargets.Count;
            if (remainingCount > 0)
            {
                List<Enemy> targets = CombatManager.EnemySm.Query(radius, preset).Exclude(_currentTargets).Best(remainingCount);
                _currentTargets.AddRange(targets);
            }

            return CurrentTargets;
        }

        private List<Enemy> GetCurrentTargets(int targetCount, float radius = DefaultTargetingRadius)
        {
            if (targetCount <= 0) return new List<Enemy>();
            if (_currentTargets.Count < targetCount)
            {
                RefreshCurrentTargets(targetCount, radius);
            }

            int resultCount = targetCount < _currentTargets.Count ? targetCount : _currentTargets.Count;
            List<Enemy> result = new List<Enemy>(resultCount);
            for (int i = 0; i < resultCount; i++)
            {
                result.Add(_currentTargets[i]);
            }

            return result;
        }
    }
}