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 string bodyPart;

        private Vector3 dragDelta = new Vector3();

        private void Start()
        {
            if (parent == null) return;

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

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

        public void Initialize(ActorBody parent, ActorAddonDef actorAddonDef)
        {
            this.parent = parent;
            this.bodyPart = actorAddonDef.addonName;

            bodyPartRenderer.sprite = actorAddonDef.graphicData.GetSprite();
            bodyPartRenderer.transform.localScale = (Vector3)actorAddonDef.graphicData.GetDrawSize();

            Start();
        }

        public void OnActorAddonChange(ActorAddon actorAddon)
        {
            if (actorAddon.AddonName == bodyPart)
            { gameObject?.SetActive(actorAddon.Render); }
        }

        public void OnActorBodySelected(ActorBody actorBody)
        {
            if (actorBody == parent)
            { bodyPartRenderer.color = Constants.ColorLightGreen; }

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

        public void OnActorBodyPartSelected(ActorBodyPart bodyPart)
        {
            if (bodyPart == this)
            { bodyPartRenderer.color = Constants.ColorGreen; }

            else if (bodyPart.parent == parent)
            { bodyPartRenderer.color = Constants.ColorLightGreen; }

            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.GetCurrentPawnKeyframe(true);
            Vector3 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            mousePosition = new Vector3(mousePosition.x, mousePosition.y, 0f);

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

            if (bodyPart.ToLower() == "head")
            {
                if (Workspace.actorManipulationMode == ActorManipulationMode.Pan)
                {
                    // It's stupid, but it works
                    Vector3 localPosA = transform.localPosition;
                    transform.position = mousePosition - dragDelta;
                    Vector3 localPosB = transform.localPosition;
                    transform.localPosition = localPosA;

                    keyframe.HeadBob += localPosB.y - localPosA.y;
                }

                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 (bodyPart.ToLower() == "appendage")
            {
                if (Workspace.actorManipulationMode == ActorManipulationMode.Rotate)
                {
                    float angle = -Vector2.SignedAngle(Vector2.up, (Vector2)mousePosition - (Vector2)transform.position);
                    keyframe.GenitalAngle = angle;
                }
            }

            else
            {
                AddonKeyframe addonKeyframe = keyframe.GetAddonKeyframe(bodyPart);
                ActorAddon addon = Workspace.GetCurrentPawnAnimationClip().GetActorAddon(bodyPart);

                if (Workspace.actorManipulationMode == ActorManipulationMode.Pan)
                {
                    ActorBody anchoringActorBody = AnimationController.Instance.actorBodies.GetComponentsInChildren<ActorBody>()?.FirstOrDefault(x => x.actorID == addon.AnchoringActor);
                    Vector3 anchor = PawnUtility.GetBodyPartAnchor(anchoringActorBody, addon.anchorName);
                    transform.position = mousePosition - dragDelta;

                    addonKeyframe.PosX = transform.position.x - anchor.x;
                    addonKeyframe.PosZ = transform.position.y - anchor.y;
                }

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

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

            EventsManager.OnPawnKeyframeChanged(keyframe);
        }

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

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

            EventsManager.OnActorBodyPartSelected(this);
        }
    }
}