using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using TriInspector;

namespace R0bbie.Timeline
{
    /// <summary>
    /// Plays one of its sub steps at random
    /// </summary>
    [AddComponentMenu("Timeline/StepSwitches/Randomised (Step Switch)")]
    public class RandomisedStepSwitch : StepSwitch
    {
        // Add ability to avoid repeating the same option twice
        [SerializeField, Tooltip("Try to avoid playing the same step twice in a row (only applicable if a StepLooper is repeating this switch!)")]
        bool avoidRepeats;
        
        List<Step> childSteps = new List<Step>();

        int lastSelectedStepIndex = -1;

        
        /// <summary>
        /// Initialise the StepSwitch
        /// </summary>
        public override void Init(StepTimeline _stepTimeline)
        {  
            // Setup necessary refs such as parent timeline
            attachedStepTimeline = _stepTimeline;
            
            // Get refs to all child steps (only 1 level deep)
            foreach (Transform t in transform)
            {
                if (t.GetComponent<Step>())
                {
                    childSteps.Add(t.GetComponent<Step>());
                }
            }
            
            // Init all child steps
            foreach (var step in childSteps)
            {
                step.Init(attachedStepTimeline, this);
            }
            
            // Reset stored values
            lastSelectedStepIndex = -1;
            
            init = true;
        }
        
        
        /// <summary>
        /// Initialise the StepSwitch by StepController
        /// </summary>
        public override void Init(StepController _controller)
        {  
            // Setup necessary refs such as parent controller
            attachedController = _controller;
            
            // Get refs to all child steps (only 1 level deep)
            foreach (Transform t in transform)
            {
                if (t.GetComponent<Step>())
                {
                    childSteps.Add(t.GetComponent<Step>());
                }
            }
            
            // Init all child steps
            foreach (var step in childSteps)
            {
                step.Init(attachedController, this);
            }
            
            // Reset stored values
            lastSelectedStepIndex = -1;
            
            init = true;
        }


        /// <summary>
        /// Play this StepSwitch, in turn playing one randomly selected child step
        /// </summary>
        public override void Play()
        {
            isActive = true;
            
            // If no child step options exist, do nothing, and just skip onto the next step in the timeline
            if (childSteps.Count < 1)
                Continue();

            // Select a child step at random
            int randomStepIndex = Random.Range(0, (childSteps.Count - 1));
            
            // If selected step is same as last one, try selecting avoid
            if (avoidRepeats && randomStepIndex == lastSelectedStepIndex)
                randomStepIndex = Random.Range(0, (childSteps.Count - 1));

            // Set the active step option to the one selected
            activeStepOption = childSteps[randomStepIndex];
            
            // 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();
            }

        }


    }
}