using UnityEngine;
using TriInspector;

namespace R0bbie.Timeline
{
    /// <summary>
    /// Watch for an event to happen, and if it doesn't after some delay, trigger a step to assist the player
    /// </summary>
    [AddComponentMenu("Timeline/StepSwitches/Watch and Assist (Step Switch)")]
    public class WatchAndAssistStepSwitch : StepSwitch
    {
        public enum WatchForEvent
        {
            OnCommandComplete,
            OnExternalTrigger
        }
        
        [Title("Switch Setup")]
        [SerializeField] WatchForEvent watchForEvent;
        
        [ShowIf("watchForEvent", WatchForEvent.OnCommandComplete)]
        [SerializeField] StepCmd watchOnCommandComplete;
        
        [ShowIf("watchForEvent", WatchForEvent.OnExternalTrigger)]
        [SerializeField] TimelineTrigger watchTrigger;

        [SerializeField, Tooltip("If watching for OnCommandComplete will skip if command previously completed, if OnExternalTrigger then if prev triggered")] bool skipIfPreviouslyTriggered;

        [SerializeField] float waitForSeconds;
        
        [Title("Switch Options")]

        [SerializeField, Tooltip("Step switched to if event isn't detected before waitForSeconds runs out")]
        Step assistAfterDelayStep;
        
        [SerializeField, Tooltip("Step switched to if event is detected before waitForSeconds is up. If left null will just continue to next step in timeline")]
        Step watchedEventPerformedStep;


        float timer;
        bool timedOut;
        
        
        /// <summary>
        /// Initialise the StepSwitch with Timeline
        /// </summary>
        public override void Init(StepTimeline _stepTimeline)
        {  
            // Setup necessary refs such as parent timeline
            attachedStepTimeline = _stepTimeline;
            
            // Inactive by default
            activeMode = Mode.Inactive;

            // Init all child steps
            if (assistAfterDelayStep)
                assistAfterDelayStep.Init(attachedStepTimeline, this);
                
            if (watchedEventPerformedStep)
                watchedEventPerformedStep.Init(attachedStepTimeline, this);

            ResetTimer();
            init = true;
        }
        
        
        /// <summary>
        /// Initialise the StepSwitch with StepController
        /// </summary>
        public override void Init(StepController _controller)
        {  
            // Setup necessary refs such as parent controller
            attachedController = _controller;
            
            // Inactive by default
            activeMode = Mode.Inactive;

            // Init all child steps
            if (assistAfterDelayStep)
                assistAfterDelayStep.Init(attachedController, this);
                
            if (watchedEventPerformedStep)
                watchedEventPerformedStep.Init(attachedController, this);

            ResetTimer();
            init = true;
        }


        void ResetTimer()
        {
            timer = 0;
            timedOut = false;
        }


        /// <summary>
        /// Play this StepSwitch
        /// </summary>
        public override void Play()
        {
            isActive = true;
            
            Debug.Log(name + " - Started");

            // Set mode to waiting for event
            activeMode = Mode.WaitingForEvent;

            // Continue immediately if action we're watching for was previously performed?
            if (skipIfPreviouslyTriggered)
            {
                if (watchForEvent == WatchForEvent.OnCommandComplete && watchOnCommandComplete)
                {
                    if (watchOnCommandComplete.completed)
                    {
                        activeStepOption = watchedEventPerformedStep;
                        PlaySetStepOption();
                    }
                }
                else if (watchForEvent == WatchForEvent.OnExternalTrigger && watchTrigger)
                {
                    waitingForExternalTrigger = true;
                    
                    if (watchTrigger.triggered)
                    {
                        activeStepOption = watchedEventPerformedStep;
                        PlaySetStepOption();
                    }
                }
            }
        }

        
        void PlaySetStepOption()
        {
            // Play the selected option, unless it's null (in which case just play next step in timeline)
            if (activeStepOption)
            {
                activeMode = Mode.PlayingChildStep;
                activeStepOption.Play();
            }
            else
            {
                Debug.Log("The option selected by the step switch was null, so just proceeding to next step in timeline.");
                Continue();
            }
        }


        void Update()
        {
            // If step switch isn't active, is paused, has already timed out, or isn't currently waiting for an event to happen (i.e. may be playing a child step already), then don't handle timer
            if (!isActive || isPaused || timedOut || activeMode != Mode.WaitingForEvent)
                return;
            
            // Add to timer
            timer += Time.deltaTime;

            // Time out once we've reached a set target seconds
            if (timer > waitForSeconds)
                timedOut = true;

            if (timedOut)
            {
                activeStepOption = assistAfterDelayStep;
                
                PlaySetStepOption();

                return;
            }

            // Wait for delay / action to be performed
            if (watchForEvent == WatchForEvent.OnCommandComplete && watchOnCommandComplete)
            {
                if (watchOnCommandComplete.completed)
                {
                    activeStepOption = watchedEventPerformedStep;
                    
                    PlaySetStepOption();
                }
            }
            else if (watchForEvent == WatchForEvent.OnExternalTrigger && watchTrigger)
            {
                if (watchTrigger.triggered)
                {
                    activeStepOption = watchedEventPerformedStep;
                    
                    PlaySetStepOption();
                }
            }
        }


    }
}