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

namespace RimWorldAnimationStudio
{
    public class ActorBody : MonoBehaviour, IPointerClickHandler, IDragHandler, IEndDragHandler
    {
        public int actorID;
        public SpriteRenderer bodyRenderer;

        private Vector3 dragDelta = new Vector3();

        private void Start()
        {
            EventsManager.onActorBodyPartSelected.AddListener(delegate(ActorBodyPart bodyPart) { OnActorBodyPartSelected(bodyPart); });
            EventsManager.onActorBodySelected.AddListener(delegate(ActorBody actorBody) { OnActorBodySelected(actorBody); });
        }

        public void OnActorBodySelected(ActorBody actorBody)
        {
            if (actorBody == this)
            { bodyRenderer.color = Constants.ColorGreen; }

            else
            { bodyRenderer.color = Constants.ColorWhite; }
        }

        public void OnActorBodyPartSelected(ActorBodyPart bodyPart)
        {
            if (bodyPart.parent == this)
            { bodyRenderer.color = Constants.ColorLightGreen; }

            else
            { bodyRenderer.color = Constants.ColorWhite; }
        }

        public void Initialize(int actorID)
        {
            this.actorID = actorID;

            if (actorID == Workspace.ActorID)
            { Activate(); }
        }

        public void OnPointerClick(PointerEventData eventData)
        {
            if (eventData.pointerCurrentRaycast.gameObject.GetComponent<ActorBodyPart>())
            { return; }

            Activate();
        }

        public void OnDrag(PointerEventData eventData)
        {
            Activate();

            PawnKeyframe keyframe = Workspace.GetCurrentPawnKeyframe(true);
            Vector3 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);

            if (dragDelta == Vector3.zero)
            { dragDelta = mousePosition - transform.position; }

            if (Workspace.actorManipulationMode == ActorManipulationMode.Pan)
            {
                keyframe.BodyOffsetX = mousePosition.x - dragDelta.x - Workspace.GetActor(actorID).GetFinalTransformOffset().x;
                keyframe.BodyOffsetZ = mousePosition.y - dragDelta.y - Workspace.GetActor(actorID).GetFinalTransformOffset().y;
            }

            else if (Workspace.actorManipulationMode == ActorManipulationMode.Rotate)
            {
                float angle = -Vector2.SignedAngle(Vector2.down, (Vector2)mousePosition - (Vector2)transform.position);
                keyframe.BodyAngle = angle;
            }

            else if (Workspace.actorManipulationMode == ActorManipulationMode.Face)
            {
                float angle = Vector2.SignedAngle(Vector2.up, (Vector2)mousePosition - (Vector2)transform.position);
                int facing = -Mathf.RoundToInt(angle / 90f );
                facing = facing < 0 ? facing + 4 : facing;

                keyframe.BodyFacing = facing;
            }

            PawnAnimationClip clip = Workspace.GetPawnAnimationClip(actorID);
            clip.BuildSimpleCurves();

            EventsManager.OnPawnKeyframeChanged(keyframe);
        }

        public void OnEndDrag(PointerEventData eventData)
        {
            Workspace.RecordEvent("Actor position / orientation");
            dragDelta = Vector3.zero;
        }

        public ActorBodyPart GetBodyPart(string bodyPart)
        {
            return GetComponentsInChildren<ActorBodyPart>(true)?.FirstOrDefault(x => x.bodyPart.ToLower() == bodyPart);
        }

        public void Activate()
        {
            Workspace.ActorID = actorID;
            Workspace.selectedBodyPart = null;

            EventsManager.OnActorBodySelected(this);
        }
    }
}