using UnityEngine;
using UnityEngine.AI;
using System.Collections;

/// <summary>
/// TeamAIController - AI controller for FRIENDLY teammates on the player's team.
/// These AI characters fight FOR the player, targeting enemy team members.
/// Used in Cash System mode for AI teammates.
/// </summary>
[RequireComponent(typeof(TeamMember))]
public class TeamAIController : MonoBehaviour
{
    [Header("AI State")]
    [SerializeField] private AIState currentState = AIState.Idle;
    
    [Header("Detection Settings")]
    [SerializeField] private float detectionRange = 15f;
    [SerializeField] private float attackRange = 2f;
    [SerializeField] private float followDistance = 5f;
    
    [Header("Behavior Settings")]
    [SerializeField] private float decisionInterval = 0.5f;
    [SerializeField] private bool followPlayer = true;
    [SerializeField] private float maxDistanceFromPlayer = 20f;
    
    [Header("References")]
    private TeamMember teamMember;
    private NavMeshAgent navAgent;
    private Animator animator;
    private CharacterAttacks characterAttacks;
    
    // Combat
    private TeamMember currentTarget;
    private float lastAttackTime;
    private float attackCooldown = 1.5f;
    
    // Cash System integration
    private CashCarrier cashCarrier;
    private CashSystemAI cashAI;
    
    public enum AIState
    {
        Idle,
        FollowPlayer,
        ChaseEnemy,
        Attack,
        CollectCash,
        DepositCash,
        Retreat
    }
    
    private void Awake()
    {
        teamMember = GetComponent<TeamMember>();
        navAgent = GetComponent<NavMeshAgent>();
        animator = GetComponent<Animator>();
        characterAttacks = GetComponent<CharacterAttacks>();
        cashCarrier = GetComponent<CashCarrier>();
        cashAI = GetComponent<CashSystemAI>();
    }
    
    private void OnEnable()
    {
        Debug.Log($"[TeamAIController] Enabled on {gameObject.name}");
        StartCoroutine(AIDecisionLoop());
    }
    
    private void OnDisable()
    {
        Debug.Log($"[TeamAIController] Disabled on {gameObject.name}");
        StopAllCoroutines();
    }
    
    private IEnumerator AIDecisionLoop()
    {
        yield return new WaitForSeconds(0.5f); // Initial delay
        
        while (enabled)
        {
            MakeDecision();
            yield return new WaitForSeconds(decisionInterval);
        }
    }
    
    private void MakeDecision()
    {
        // Lazy re-cache: CashSystemAI is added AFTER our Awake() by ConfigureCharacterControllers,
        // so the Awake-time GetComponent returns null. Re-check here once.
        if (cashAI == null) cashAI = GetComponent<CashSystemAI>();
        
        // If CashSystemAI is attached and active, delegate ALL decisions to it
        if (cashAI != null && cashAI.enabled)
        {
            // CashSystemAI handles the high-level decision making via its own Update()
            return;
        }
        
        // Standard team AI decision making
        TeamMember nearestEnemy = teamMember.FindNearestEnemy();
        TeamMember playerControlled = TeamMember.GetPlayerControlledMember();
        
        // Priority 1: Attack nearby enemies
        if (nearestEnemy != null)
        {
            float distanceToEnemy = Vector3.Distance(transform.position, nearestEnemy.transform.position);
            
            if (distanceToEnemy <= attackRange)
            {
                SetState(AIState.Attack);
                currentTarget = nearestEnemy;
                PerformAttack();
                return;
            }
            else if (distanceToEnemy <= detectionRange)
            {
                SetState(AIState.ChaseEnemy);
                currentTarget = nearestEnemy;
                MoveToTarget(nearestEnemy.transform.position);
                return;
            }
        }
        
        // Priority 2: Follow the player-controlled character
        if (followPlayer && playerControlled != null && playerControlled != teamMember)
        {
            float distanceToPlayer = Vector3.Distance(transform.position, playerControlled.transform.position);
            
            if (distanceToPlayer > followDistance)
            {
                SetState(AIState.FollowPlayer);
                MoveToTarget(playerControlled.transform.position);
                return;
            }
        }
        
        // Default: Idle
        SetState(AIState.Idle);
        StopMovement();
    }
    
    private void SetState(AIState newState)
    {
        if (currentState != newState)
        {
            currentState = newState;
            Debug.Log($"[TeamAIController] {gameObject.name} -> {newState}");
        }
    }
    
    private void MoveToTarget(Vector3 position)
    {
        if (navAgent != null && navAgent.isActiveAndEnabled && navAgent.isOnNavMesh)
        {
            navAgent.isStopped = false;
            navAgent.SetDestination(position);
            
            // Update animator
            if (animator != null)
            {
                float speed = navAgent.velocity.magnitude / navAgent.speed;
                animator.SetFloat("Speed", speed);
            }
        }
    }
    
    private void StopMovement()
    {
        if (navAgent != null && navAgent.isActiveAndEnabled && navAgent.isOnNavMesh)
        {
            navAgent.isStopped = true;
            navAgent.velocity = Vector3.zero;
        }
        
        if (animator != null)
        {
            animator.SetFloat("Speed", 0f);
        }
    }
    
    private void PerformAttack()
    {
        if (Time.time - lastAttackTime < attackCooldown) return;
        
        // Face the target
        if (currentTarget != null)
        {
            Vector3 direction = (currentTarget.transform.position - transform.position).normalized;
            direction.y = 0;
            if (direction.sqrMagnitude > 0.001f)
            {
                transform.rotation = Quaternion.LookRotation(direction);
            }
        }
        
        // Perform attack using CharacterAttacks if available
        if (characterAttacks != null)
        {
            // Choose a random attack
            string[] attacks = { AnimationNames.Jab, AnimationNames.LowKick, AnimationNames.Haymaker };
            string randomAttack = attacks[Random.Range(0, attacks.Length)];
            
            characterAttacks.PunchAttacksDirectly(randomAttack);
            lastAttackTime = Time.time;
        }
        else if (animator != null)
        {
            // Fallback to direct animation trigger
            animator.SetTrigger("attack");
            lastAttackTime = Time.time;
        }
    }
    
    private void Update()
    {
        // When CashSystemAI is driving, don't interfere with NavMeshAgent
        if (cashAI != null && cashAI.enabled) return;
        
        // Continuous state updates
        switch (currentState)
        {
            case AIState.Attack:
                if (currentTarget != null)
                {
                    float distance = Vector3.Distance(transform.position, currentTarget.transform.position);
                    if (distance > attackRange * 1.5f)
                    {
                        // Move closer
                        MoveToTarget(currentTarget.transform.position);
                    }
                    else
                    {
                        StopMovement();
                        PerformAttack();
                    }
                }
                break;
                
            case AIState.ChaseEnemy:
                if (currentTarget != null)
                {
                    MoveToTarget(currentTarget.transform.position);
                }
                break;
        }
    }
    
    /// <summary>
    /// Set a specific target for this AI to attack
    /// </summary>
    public void SetTarget(TeamMember target)
    {
        currentTarget = target;
        if (target != null)
        {
            SetState(AIState.ChaseEnemy);
        }
    }
    
    /// <summary>
    /// Command this AI to move to a specific position
    /// </summary>
    public void MoveTo(Vector3 position)
    {
        MoveToTarget(position);
    }
    
    /// <summary>
    /// Get current AI state
    /// </summary>
    public AIState GetCurrentState() => currentState;
}