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

namespace TKS
{
    /// <summary>
    /// 자동 플레이 실측: 아군도 AI 로 조작해 몇 턴을 돌리며 스크린샷·로그를 남긴다.
    /// 에디터에서 ProjectSetup.AutoPlayCapture 가 SessionState 로 출력 폴더를 넘기면 생성된다.
    /// </summary>
    public class AutoPlayDriver : MonoBehaviour
    {
        public string OutputDir;
        public int MaxTurns = 3;
        public int Width = 720;
        public int Height = 1280;

        readonly List<string> log = new List<string>();
        int shotIndex = 1;

#if UNITY_EDITOR
        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
        static void AutoSpawn()
        {
            string dir = UnityEditor.SessionState.GetString("TKS_AUTOPLAY_DIR", "");
            if (string.IsNullOrEmpty(dir)) return;
            UnityEditor.SessionState.EraseString("TKS_AUTOPLAY_DIR");
            var go = new GameObject("AutoPlayDriver");
            var d = go.AddComponent<AutoPlayDriver>();
            d.OutputDir = dir;
            d.MaxTurns = UnityEditor.SessionState.GetInt("TKS_AUTOPLAY_TURNS", 3);
        }
#endif

        IEnumerator Start()
        {
            Directory.CreateDirectory(OutputDir);
            float t0 = Time.realtimeSinceStartup;
            while ((BattleManager.Instance == null || BattleManager.Instance.Phase != BattlePhase.PlayerTurn)
                   && Time.realtimeSinceStartup - t0 < 20f)
            {
                yield return null;
            }
            var bm = BattleManager.Instance;
            var cam = Camera.main;
            if (bm == null || cam == null)
            {
                Log("FAIL: BattleManager 또는 카메라 없음");
                Finish(1);
                yield break;
            }

            Log("stage=" + bm.Stage.title + " players=" + bm.AliveCount(Faction.Player) + " enemies=" + bm.AliveCount(Faction.Enemy));
            yield return Fx.Wait(0.6f);
            yield return Shot(cam, "start");

            var first = FirstActable(bm);
            if (first != null)
            {
                var tgt = EnemyAI.Decide(first, bm.AliveUnits(Faction.Enemy), 1f, bm.Rng, bm.Board);
                Vector2 pointer = first.Position - (tgt - first.Position) * 0.5f;
                bm.Sling.ShowPreview(first, tgt, pointer);
                first.View.SetSelected(true);
                yield return null;
                yield return Shot(cam, "aim_" + first.DisplayName);
                first.View.SetSelected(false);
                bm.Sling.HidePreview();
            }

            bool firstActionShot = false;
            for (int turn = 1; turn <= MaxTurns; turn++)
            {
                int guard = 0;
                while (bm.Phase == BattlePhase.PlayerTurn && guard++ < 24)
                {
                    var u = FirstActable(bm);
                    if (u == null)
                    {
                        bm.OnEmptyTap();
                        break;
                    }
                    var target = EnemyAI.Decide(u, bm.AliveUnits(Faction.Enemy), 1f, bm.Rng, bm.Board);
                    if (!bm.RequestPlayerAction(u, target)) break;
                    while (bm.Phase == BattlePhase.Resolving) yield return null;
                    Log("turn " + turn + " | " + bm.LastMessage);
                    if (!firstActionShot)
                    {
                        firstActionShot = true;
                        yield return Shot(cam, "after_first_action");
                    }
                    if (bm.Phase == BattlePhase.StageClear || bm.Phase == BattlePhase.Defeat) break;
                }
                while (bm.Phase == BattlePhase.EnemyTurn || bm.Phase == BattlePhase.Resolving) yield return null;
                Log("turn " + turn + " end | phase=" + bm.Phase + " players=" + bm.AliveCount(Faction.Player) + " enemies=" + bm.AliveCount(Faction.Enemy) + " | " + bm.LastMessage);
                yield return Shot(cam, "turn" + turn + "_end");
                if (bm.Phase == BattlePhase.StageClear || bm.Phase == BattlePhase.Defeat) break;
            }

            File.WriteAllLines(Path.Combine(OutputDir, "autoplay_log.txt"), log.ToArray());
            Finish(0);
        }

        static Unit FirstActable(BattleManager bm)
        {
            foreach (var u in bm.AliveUnits(Faction.Player))
            {
                if (!u.ActedThisTurn) return u;
            }
            return null;
        }

        IEnumerator Shot(Camera cam, string name)
        {
            string file = Path.Combine(OutputDir, shotIndex.ToString("00") + "_" + name + ".png");
            shotIndex++;
            yield return CaptureUtil.Capture(cam, Width, Height, file);
            Log("shot " + file);
        }

        void Log(string s)
        {
            log.Add(s);
            Debug.Log("[AutoPlay] " + s);
        }

        void Finish(int code)
        {
            try
            {
                File.WriteAllLines(Path.Combine(OutputDir, "autoplay_log.txt"), log.ToArray());
            }
            catch
            {
            }
#if UNITY_EDITOR
            UnityEditor.EditorApplication.Exit(code);
#else
            Application.Quit(code);
#endif
        }
    }
}