using MoreMountains.Feedbacks;
using MoreMountains.Tools;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace MoreMountains.Feel
{
    /// <summary>
    /// A simple class controlling the hero character in the Barbarians demo scene
    /// It simulates a very simple character controller in an ARPG game
    /// </summary>
    public class Barbarian : MonoBehaviour
    {
        [Header("Input")]
        /// a key to use to attack
        [Tooltip("a key to use to attack")]
        public KeyCode ActionKey = KeyCode.Space;
        /// a secondary key to use to attack
        [Tooltip("a secondary key to use to attack")]
        public KeyCode ActionKeyAlt = KeyCode.Joystick1Button0;

        [Header("Cooldown")]
        /// a duration, in seconds, between two attacks, during which attacks are prevented
        [Tooltip("a duration, in seconds, between two attacks, during which attacks are prevented")]
        public float CooldownDuration = 0.1f;

        [Header("Feedbacks")]
        /// a feedback to call when the attack starts
        [Tooltip("a feedback to call when the attack starts")]
        public MMFeedbacks AttackFeedback;
        /// a feedback to call when each individual attack phase starts
        [Tooltip("a feedback to call when each individual attack phase starts")]
        public MMFeedbacks IndividualAttackFeedback;
        /// a feedback to call when trying to attack while in cooldown
        [Tooltip("a feedback to call when trying to attack while in cooldown")]
        public MMFeedbacks DeniedFeedback;

        [Header("Attack settings")]
        /// a curve on which to move the character when it attacks
        public MMTween.MMTweenCurve AttackCurve = MMTween.MMTweenCurve.EaseInOutOverhead;
        /// the duration of the attack in seconds
        public float AttackDuration = 2.5f;
        /// an offset at which to attack enemies
        public float AttackPositionOffset = 0.3f;
        /// a duration by which to reduce movement duration after every attack (making each attack faster than the previous one)
        public float IntervalDecrement = 0.1f;

        protected List<Vector3> _targets;
        protected float _lastAttackStartedAt = -100f;
        protected Vector3 _initialPosition;
        protected Vector3 _initialLookAtTarget;
        protected Vector3 _lookAtTarget;
        protected BarbarianEnemy _enemy;

        /// <summary>
        /// On Awake we store our initial position
        /// </summary>
        protected virtual void Awake()
        {
            _initialPosition = this.transform.position;
            _initialLookAtTarget = this.transform.position + this.transform.forward * 10f;
            _lookAtTarget = _initialLookAtTarget;
        }

        /// <summary>
        /// On Update we look for input
        /// </summary>
        protected virtual void Update()
        {
            HandleInput();
            LookAtTarget();
        }

        /// <summary>
        /// Makes the character look at the target it's attacking
        /// </summary>
        protected virtual void LookAtTarget()
        {
            Vector3 direction = _lookAtTarget - _initialPosition;
            this.transform.LookAt(_lookAtTarget + direction * 5f);
        }

        /// <summary>
        /// Detects input
        /// </summary>
        protected virtual void HandleInput()
        {
            if (Input.GetKeyDown(ActionKey) || Input.GetKeyDown(ActionKeyAlt) || Input.GetMouseButtonDown(0))
            {
                Attack();
            }
        }

        /// <summary>
        /// Performs an attack if possible, otherwise plays a denied feedback
        /// </summary>
        protected virtual void Attack()
        {
            if (Time.time - _lastAttackStartedAt < CooldownDuration + AttackDuration)
            {
                DeniedFeedback?.PlayFeedbacks();
            }
            else
            {
                AcquireTargets();
                StartCoroutine(AttackCoroutine());
                _lastAttackStartedAt = Time.time;
            }
        }

        /// <summary>
        /// Finds targets around the Barbarian and stores them
        /// </summary>
        protected virtual void AcquireTargets()
        {
            _targets = new List<Vector3>();

            Collider[] hitColliders = Physics.OverlapSphere(this.transform.position, 5f);
            foreach (var hitCollider in hitColliders)
            {
                Vector3 enemyPosition = hitCollider.transform.position;
                Vector3 direction = this.transform.position - enemyPosition;

                if (hitCollider.GetComponent<BarbarianEnemy>() != null)
                {
                    _targets.Add(enemyPosition + direction * AttackPositionOffset);
                }               
            }
            _targets.MMShuffle();
        }
        
        /// <summary>
        /// A coroutine used to move to each stored target to attack them
        /// </summary>
        /// <returns></returns>
        protected virtual IEnumerator AttackCoroutine()
        {
            float intervalDuration = AttackDuration / _targets.Count;
            
            // we play our initial attack feedback
            AttackFeedback?.PlayFeedbacks();

            int enemyCounter = 0;

            foreach (Vector3 destination in _targets)
            {
                // for each new enemy, we play an attack feedback
                IndividualAttackFeedback?.PlayFeedbacks();
                MMTween.MoveTransform(this, this.transform, this.transform.position, destination, null, 0f, intervalDuration, AttackCurve);
                _lookAtTarget = destination;                
                yield return MMCoroutine.WaitFor(intervalDuration - enemyCounter * IntervalDecrement);
                enemyCounter++;
            }

            MMTween.MoveTransform(this, this.transform, this.transform.position, _initialPosition, null, 0f, intervalDuration, AttackCurve);
            _lookAtTarget = _initialLookAtTarget;
        }

        /// <summary>
        /// When we collide with an enemy, we apply damage to it
        /// </summary>
        /// <param name="other"></param>
        protected virtual void OnTriggerEnter(Collider other)
        {
            _enemy = other.GetComponent<BarbarianEnemy>();
            if (_enemy != null)
            {
                // we randomize the damage done and apply it to the enemy
                int damage = Random.Range(50, 250);
                _enemy.TakeDamage(damage);
            }
        }
    }
}