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

namespace Ichni.RhythmGame
{
    public partial class Trail : GameElement, IHaveTransformSubmodule, IHaveTrail
    {
        #region [暴露属性字段] Essential Configs
        public Material renderMaterial;
        public float visibleTimeLength;
        public bool isAutoOrient;
        public float widthMultiplier;
        public AnimationCurve widthCurve;
        public Gradient gradient;
        #endregion

        #region [子模块接口] Submodules
        public TrailRenderer trailRenderer { get; set; }
        public TransformSubmodule transformSubmodule { get; set; }
        #endregion

        #region [生命周期] Lifecycle & Factory
        public static Trail GenerateElement(string name, Guid id, List<string> tags, bool isFirstGenerated,
            GameElement parentElement, float visibleTimeLength, bool isAutoOrient, float widthMultiplier,
            AnimationCurve widthCurve, Gradient gradient, Material material = null)
        {
            Trail trail = Instantiate(GameManager.Instance.basePrefabs.trail, parentElement.transform).GetComponent<Trail>();
            trail.trailRenderer = trail.GetComponent<TrailRenderer>();

            trail.Initialize(name, id, tags, isFirstGenerated, parentElement);

            trail.renderMaterial = material == null ? GameManager.Instance.basePrefabs.defaultTrailMaterial : material;
            trail.visibleTimeLength = visibleTimeLength;
            trail.isAutoOrient = isAutoOrient;
            trail.widthMultiplier = widthMultiplier;
            trail.widthCurve = widthCurve;
            trail.gradient = gradient;

            trail.trailRenderer.material = trail.renderMaterial;
            trail.trailRenderer.time = visibleTimeLength;
            trail.trailRenderer.alignment = isAutoOrient ? LineAlignment.View : LineAlignment.TransformZ;
            trail.trailRenderer.widthMultiplier = widthMultiplier;
            trail.trailRenderer.widthCurve = widthCurve;
            trail.trailRenderer.colorGradient = gradient;
            trail.trailRenderer.emitting = false;
            return trail;
        }

        public override void SetDefaultSubmodules()
        {
            transformSubmodule = new TransformSubmodule(this);
        }
        
        public override void WhenStart()
        {
            base.WhenStart();
            trailRenderer.emitting = true;
            trailRenderer.Clear();
        }
        #endregion
    }

    #region [接口定义] Interfaces
    public interface IHaveTrail
    {
        TrailRenderer trailRenderer { get; set; }
    }
    #endregion

}