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

namespace RimWorldAnimationStudio
{
    public class ActorBodyPart : MonoBehaviour, IPointerClickHandler, IDragHandler, IEndDragHandler
    {
        public SpriteRenderer bodyPartRenderer;
        public ActorBody parent;
        public bool isHead = false;
        public bool isSelected = false;

        public void Update()
        {
            if ((Workspace.actorID == parent.actorID && Workspace.selectedBodyPart == null) || Workspace.selectedBodyPart == this)
            { bodyPartRenderer.color = Constants.ColorGreen; }

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

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

            Activate();
        }

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

            PawnKeyframe keyframe = Workspace.Instance.GetCurrentPawnKeyframe(true);

            if (keyframe == null)
            { Debug.LogWarning("Cannot alter actor - no keyframe data available"); return; }

            Vector3 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);

            if (isHead)
            {
                if (Workspace.actorManipulationMode == ActorManipulationMode.Pan)
                {
                    Vector3 headOffset = new Vector3(0f, 0.34f, 0f);
                    headOffset = Quaternion.Euler(0, 0, keyframe.bodyAngle) * headOffset;

                    float distance = Vector2.Dot(parent.transform.up, (Vector2)(mousePosition - parent.transform.position - headOffset));

                    keyframe.headBob = distance;
                }

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

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

                    Workspace.animationDef.actors[Workspace.actorID].controlGenitalAngle = Workspace.animationDef.animationStages.Any(x => x.animationClips[Workspace.actorID].keyframes.Any(y => y.genitalAngle != 0));
                }
            }

            PawnAnimationClip clip = Workspace.Instance.GetPawnAnimationClip(parent.actorID);
            clip.BuildSimpleCurves();
        }

        public void OnEndDrag(PointerEventData eventData)
        {
            Workspace.Instance.RecordEvent("Actor position / orientation");
        }

        public void Activate()
        {
            Workspace.actorID = parent.actorID;
            Workspace.selectedBodyPart = this;
        }
    }
}