using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// 用来返回某一时刻的碰撞盒几何数据
public struct ColliderInfo
{
    public bool active;
    public float frame;
    public Vector3 position;
    public Vector3 size;
    public ColliderBox.EColliderType type { get { return collider.type; } }
    public ColliderBox.Pivot pivot { get { return collider.pivot; } }
    public ColliderBox collider;
    public int colliderHash { get { return collider.GetHashCode(); } }

    public bool isValid { get { return collider != null; } } // 没有对应的数据时为false
}

// 某个碰撞盒的属性和帧数据，从属于animation data
[Serializable]
public class ColliderData
{
    [Serializable]
    public class ColliderFrame
    {
        public int frame;
        public bool active;
        public Vector3 position;
        public Vector3 size;
    }

    public ColliderBox.EColliderType type { get { return collider.type; } }
    public ColliderBox.Pivot pivot { get { return collider.pivot; } }

    public ColliderBox collider;

    public List<ColliderFrame> frames;

    public ColliderData(ColliderBox.EColliderType type, ColliderBox.Pivot pivot)
    {
        this.frames = new List<ColliderFrame>();
        if (collider == null)
            collider = new ColliderBox();
        collider.type = type;
        collider.pivot = pivot;
    }

    public ColliderInfo GetColliderInfo(float frame)
    {
        ColliderInfo info = new ColliderInfo();
        info.active = false; // default
        info.collider = collider;
        info.frame = frame;
        int previous = 0;
        int end = -1;
        for (int i = 0; i < frames.Count; ++i)
        {
            if(frame >= frames[i].frame)
            {
                previous = frames[i].frame;
            }
            if(frames[i].frame > frame)
            {
                end = frames[i].frame;
                break;
            }
        }
        if(end == -1)
        {
            if(type == ColliderBox.EColliderType.HurtBox)
            {
                ColliderFrame pre = frames.Find(s => s.frame == previous);
                if (pre == null)
                    return info;
                info.active = pre.active;
                info.position = pre.position;
                info.size = pre.size;
            }
        }
        else
        {
            ColliderFrame pre = frames.Find(s => s.frame == previous);
            ColliderFrame next = frames.Find(s => s.frame == end);
            if (pre == null || next == null)
                return info;
            info.active = pre.active;
            float t = (frame - previous) / (end - previous);
            info.position = Vector3.Lerp(pre.position, next.position, t);
            info.size = Vector3.Lerp(pre.size, next.size, t);
        }
        return info;
    }

    public ColliderFrame AddFrame(int frameIndex)
    {
        if (frames == null)
            frames = new List<ColliderFrame>();
        ColliderFrame frame = new ColliderFrame();
        frame.frame = frameIndex;
        frame.active = true;
        frame.position = Vector3.zero;
        frame.size = new Vector3(1,1,0.5f);
        frames.Add(frame);
        frames.Sort((a, b) => {
            if (a == null)
                return 1;
            if (b == null)
                return -1;
            if (a.frame < b.frame)
                return -1;
            if (a.frame > b.frame)
                return 1;
            return 0;
        });
		return frame;
    }

    public void DeleteFrame(int frameIndex)
    {
        if (frames == null)
            return;
        ColliderFrame frame = null;
        foreach(var f in frames)
        {
            if (f.frame == frameIndex)
                frame = f;
        }
        if(frame != null)
        {
            frames.Remove(frame);
        }
    }

}