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 bool isSelected = false;

        public SpriteRenderer bodyRenderer;
        public SpriteRenderer headRenderer;
        public SpriteRenderer appendageRenderer;

        private Vector3 delta = new Vector3();

        public bool actorBodyPartSelected { get { return GetComponentsInChildren<ActorBodyPart>().Any(x => x.isSelected); } }

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

        public void Update()
        {
            if (Workspace.ActorID == actorID && Workspace.selectedBodyPart == null)
            { bodyRenderer.color = Constants.ColorGreen; }

            else
            { bodyRenderer.color = Constants.ColorWhite; }

            foreach (ActorAddon addon in Workspace.GetCurrentAnimationStage().AnimationClips[actorID].Addons)
            {
                ActorBodyPart bodyPart = GetComponentsInChildren<ActorBodyPart>(true).FirstOrDefault(x => x.addonName == addon.AddonName);
                bodyPart?.gameObject?.SetActive(addon.Render);         
            }
        }

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

            Activate();
        }

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

            PawnKeyframe keyframe = Workspace.GetCurrentPawnKeyframe(true);

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

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

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

            if (Workspace.actorManipulationMode == ActorManipulationMode.Pan)
            {
                keyframe.BodyOffsetX = mousePosition.x - delta.x - Workspace.animationDef.Actors[actorID].GetFinalTransformOffset().x;
                keyframe.BodyOffsetZ = mousePosition.y - delta.y - Workspace.animationDef.Actors[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();
        }

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

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