using System.Collections;
using System.Collections.Generic;
using Platformer.Core;
using Platformer.Model;
using UnityEngine;

namespace Platformer.Mechanics
{
    /// <summary>
    /// AnimationController integrates physics and animation. It is generally used for simple enemy animation.
    /// </summary>
    // BT12-Dev 2026-05-12 — Visual 자식 분리: RequireComponent SpriteRenderer·Animator 폐기.
    // GetComponentInChildren fallback로 Visual 자식 영역 영역 영역.
    public class AnimationController : KinematicObject
    {
        /// <summary>
        /// Max horizontal speed.
        /// </summary>
        public float maxSpeed = 7;
        /// <summary>
        /// Max jump velocity
        /// </summary>
        public float jumpTakeOffSpeed = 7;

        /// <summary>
        /// Used to indicated desired direction of travel.
        /// </summary>
        public Vector2 move;

        /// <summary>
        /// Set to true to initiate a jump.
        /// </summary>
        public bool jump;

        /// <summary>
        /// Set to true to set the current jump velocity to zero.
        /// </summary>
        public bool stopJump;

        SpriteRenderer spriteRenderer;
        Animator animator;
        PlatformerModel model;

        protected virtual void Awake()
        {
            // BT12-Dev 2026-05-12 — Visual 자식 분리 (PD 지시): SpriteRenderer·Animator가 자식 Visual GameObject에 위치할 수 있음.
            spriteRenderer = GetComponent<SpriteRenderer>();
            if (spriteRenderer == null) spriteRenderer = GetComponentInChildren<SpriteRenderer>();
            animator = GetComponent<Animator>();
            if (animator == null) animator = GetComponentInChildren<Animator>();
            // BT12-Dev 2026-05-12 — field initializer Awake 영역 이동 (Editor·Play mode 전환 시 model 미초기화 NRE 회피).
            try { model = Simulation.GetModel<PlatformerModel>(); } catch { model = null; }

            // BT12-Dev 2026-05-12 — KinematicObject base 영역 protected virtual OnEnable/Start/Update/FixedUpdate Unity 호출 X 정정
            // (override X·derived class만 magic method 영역). Awake 영역 base 초기화 위임.
            body = GetComponent<Rigidbody2D>();
            if (body != null) body.bodyType = RigidbodyType2D.Kinematic;
            contactFilter.useTriggers = false;
            contactFilter.SetLayerMask(Physics2D.GetLayerCollisionMask(gameObject.layer));
            contactFilter.useLayerMask = true;
        }

        // BT12-Dev 2026-05-12 — Update·FixedUpdate Unity 호출 정합 (override 영역 derived 영역 호출 영역)
        protected override void Update()
        {
            base.Update();
        }

        protected override void FixedUpdate()
        {
            base.FixedUpdate();
        }

        protected override void ComputeVelocity()
        {
            float jumpMod = model != null ? model.jumpModifier : 1f;
            float jumpDec = model != null ? model.jumpDeceleration : 0.5f;
            if (jump && IsGrounded)
            {
                velocity.y = jumpTakeOffSpeed * jumpMod;
                jump = false;
            }
            else if (stopJump)
            {
                stopJump = false;
                if (velocity.y > 0)
                {
                    velocity.y = velocity.y * jumpDec;
                }
            }

            // PD 명시 2026-05-08 — PlayerController와 동일 영역 정합: 좌측 향한 sprite 기준 우측 이동 시 flipX=true
            if (spriteRenderer != null)
            {
                if (move.x > 0.01f) spriteRenderer.flipX = true;
                else if (move.x < -0.01f) spriteRenderer.flipX = false;
            }

            if (animator != null)
            {
                animator.SetBool("grounded", IsGrounded);
                animator.SetFloat("velocityX", Mathf.Abs(velocity.x) / maxSpeed);
            }

            targetVelocity = move * maxSpeed;
        }
    }
}