using System;
using System.Collections;
using System.Collections.Generic;
using Ichni.RhythmGame.Beatmap;
using UnityEngine;

namespace Ichni.RhythmGame
{
    public partial class CameraFieldOfView : AnimationBase
    {
        #region [暴露属性字段与关联] Exposed Fields & References
        public FlexibleFloat fieldOfView;
        public GameCamera targetGameCamera;
        #endregion
        
        #region [生命周期与工厂] Lifecycle & Factory
        public static CameraFieldOfView GenerateElement(string elementName, Guid id,
            List<string> tags, bool isFirstGenerated, GameCamera gameCamera, FlexibleFloat fieldOfView)
        {
            CameraFieldOfView camFOV = Instantiate(GameManager.Instance.basePrefabs.emptyObject)
                .AddComponent<CameraFieldOfView>();
            camFOV.Initialize(elementName, id, tags, isFirstGenerated, gameCamera);

            camFOV.animatedObject = gameCamera;
            camFOV.targetGameCamera = gameCamera;
            
            camFOV.fieldOfView = fieldOfView;
            camFOV.animationReturnType = FlexibleReturnType.Before;

            return camFOV;
        }
        
        public override void SetDefaultSubmodules()
        {
            timeDurationSubmodule = new TimeDurationSubmodule(this);
        }
        #endregion

        #region [核心动画逻辑] Core Animation Logic
        protected override void UpdateAnimation(float songTime, bool forceUpdate)
        {
            fieldOfView.UpdateFlexibleFloat(songTime);

            if (forceUpdate || fieldOfView.returnType == FlexibleReturnType.MiddleExecuting)
            {
                targetGameCamera.perspectiveAngle = fieldOfView.value;
                targetGameCamera.cam.fieldOfView = fieldOfView.value;
            }
        }
        
        public override void ApplyTimeOffset(float offset)
        {
            base.ApplyTimeOffset(offset);
            fieldOfView.animations.ForEach(anim => anim.ApplyTimeOffset(offset));
        }
        #endregion
    }

}