// 2026년 포트폴리오용 재구성 코드. 실제 업무 당시 소스가 아닙니다.
// 2026 portfolio reconstruction. Not original production source.
using System;
using UnityEngine;

namespace PortfolioExamples
{
    // A visual snapshot, deliberately independent from the live training state machine.
    public struct ReplayFrame
    {
        public float Time;
        public Vector3 Position;
        public Quaternion Rotation;
        public bool Visible;
        public int AnimationState;
        public float AnimationTime;
    }

    public static class ReplayTimeline
    {
        public static ReplayFrame Sample(ReplayFrame[] frames, float time)
        {
            if (frames == null || frames.Length == 0) throw new ArgumentException("No frames.");
            if (float.IsNaN(time) || float.IsInfinity(time)) throw new ArgumentException("Invalid time.");
            // This small standalone sample validates each call. A streaming adapter can validate once on import.
            for (int i = 0; i < frames.Length; i++)
            {
                if (float.IsNaN(frames[i].Time) || float.IsInfinity(frames[i].Time)) throw new ArgumentException("Invalid recorded time.");
                if (i > 0 && frames[i].Time <= frames[i - 1].Time) throw new ArgumentException("Times must increase.");
            }
            if (time <= frames[0].Time) return frames[0];
            if (time >= frames[frames.Length - 1].Time) return frames[frames.Length - 1];
            int lo = 0, hi = frames.Length - 1;
            while (hi - lo > 1) { int mid = (lo + hi) / 2; if (frames[mid].Time <= time) lo = mid; else hi = mid; }
            ReplayFrame a = frames[lo], b = frames[hi];
            float t = Mathf.InverseLerp(a.Time, b.Time, time);
            return new ReplayFrame {
                Time = time, Position = Vector3.Lerp(a.Position, b.Position, t),
                Rotation = Quaternion.Slerp(a.Rotation, b.Rotation, t),
                // Discrete values hold until the next recorded timestamp.
                Visible = a.Visible, AnimationState = a.AnimationState,
                AnimationTime = a.AnimationState == b.AnimationState
                    ? Mathf.Lerp(a.AnimationTime, b.AnimationTime, t) : a.AnimationTime
            };
        }
    }
}