using System;
using System.Collections;
using UnityEngine;

/// <summary>
/// Reusable action execution system with busy state management.
/// Replaces repeated coroutine busy-state patterns across the codebase.
/// </summary>
public class ActionExecutor : MonoBehaviour
{
    public bool IsBusy { get; private set; }

    private Coroutine _currentAction;

    /// <summary>
    /// Event fired when an action starts.
    /// </summary>
    public event Action OnActionStarted;

    /// <summary>
    /// Event fired when an action completes.
    /// </summary>
    public event Action OnActionCompleted;

    /// <summary>
    /// Event fired when an action is cancelled.
    /// </summary>
    public event Action OnActionCancelled;

    /// <summary>
    /// Try to execute an action. Returns false if already busy.
    /// </summary>
    /// <param name="request">The action request to execute</param>
    /// <returns>True if action started, false if busy</returns>
    public bool TryExecute(ActionRequest request)
    {
        if (IsBusy) return false;

        _currentAction = StartCoroutine(ExecuteRoutine(request));
        return true;
    }

    /// <summary>
    /// Cancel the current action if one is running.
    /// </summary>
    public void Cancel()
    {
        if (_currentAction != null)
        {
            StopCoroutine(_currentAction);
            _currentAction = null;
            IsBusy = false;
            OnActionCancelled?.Invoke();
        }
    }

    /// <summary>
    /// Force reset the busy state. Use with caution.
    /// </summary>
    public void ForceReset()
    {
        if (_currentAction != null)
        {
            StopCoroutine(_currentAction);
            _currentAction = null;
        }
        IsBusy = false;
    }

    private IEnumerator ExecuteRoutine(ActionRequest request)
    {
        IsBusy = true;
        OnActionStarted?.Invoke();

        // Pre-action callback
        request.OnStart?.Invoke();

        // Animation trigger
        if (request.Animator != null && !string.IsNullOrEmpty(request.AnimTrigger))
        {
            if (request.AnimSpeed > 0)
            {
                request.Animator.SetFloat("ActionSpeed", request.AnimSpeed);
            }
            request.Animator.SetTrigger(request.AnimTrigger);
        }

        // Wait for impact point
        if (request.ImpactDelay > 0)
        {
            float adjustedDelay = request.AnimSpeed > 0
                ? request.ImpactDelay / request.AnimSpeed
                : request.ImpactDelay;
            yield return new WaitForSeconds(adjustedDelay);
        }

        // Execute main effect
        request.OnImpact?.Invoke();

        // Wait for remaining duration
        float remainingTime = request.TotalDuration - request.ImpactDelay;
        if (request.AnimSpeed > 0)
        {
            remainingTime /= request.AnimSpeed;
        }

        if (remainingTime > 0)
        {
            yield return new WaitForSeconds(remainingTime);
        }

        // Completion callback
        request.OnComplete?.Invoke();

        IsBusy = false;
        _currentAction = null;
        OnActionCompleted?.Invoke();
    }
}

/// <summary>
/// Configuration for an action to be executed by ActionExecutor.
/// </summary>
[Serializable]
public struct ActionRequest
{
    /// <summary>
    /// Animator to trigger animations on.
    /// </summary>
    public Animator Animator;

    /// <summary>
    /// Animation trigger name.
    /// </summary>
    public string AnimTrigger;

    /// <summary>
    /// Animation playback speed multiplier.
    /// </summary>
    public float AnimSpeed;

    /// <summary>
    /// Time delay before the impact/effect happens (for syncing with animation).
    /// </summary>
    public float ImpactDelay;

    /// <summary>
    /// Total duration of the action.
    /// </summary>
    public float TotalDuration;

    /// <summary>
    /// Callback invoked when action starts.
    /// </summary>
    public Action OnStart;

    /// <summary>
    /// Callback invoked at the impact moment.
    /// </summary>
    public Action OnImpact;

    /// <summary>
    /// Callback invoked when action completes.
    /// </summary>
    public Action OnComplete;

    /// <summary>
    /// Create a simple action request with just timing.
    /// </summary>
    public static ActionRequest Simple(float duration, Action onComplete)
    {
        return new ActionRequest
        {
            TotalDuration = duration,
            AnimSpeed = 1f,
            OnComplete = onComplete
        };
    }

    /// <summary>
    /// Create an animated action request.
    /// </summary>
    public static ActionRequest Animated(Animator animator, string trigger, float duration,
        float impactDelay, Action onImpact, float speed = 1f)
    {
        return new ActionRequest
        {
            Animator = animator,
            AnimTrigger = trigger,
            AnimSpeed = speed,
            ImpactDelay = impactDelay,
            TotalDuration = duration,
            OnImpact = onImpact
        };
    }

    /// <summary>
    /// Create a full action request with all callbacks.
    /// </summary>
    public static ActionRequest Full(Animator animator, string trigger, float duration,
        float impactDelay, float speed, Action onStart, Action onImpact, Action onComplete)
    {
        return new ActionRequest
        {
            Animator = animator,
            AnimTrigger = trigger,
            AnimSpeed = speed,
            ImpactDelay = impactDelay,
            TotalDuration = duration,
            OnStart = onStart,
            OnImpact = onImpact,
            OnComplete = onComplete
        };
    }
}