using UnityEngine;

namespace TKS
{
    /// <summary>씬에 하나만 두면 카메라·전장·전투 관리자·HUD·입력을 코드로 구성하고 첫 스테이지를 시작한다.</summary>
    public class GameBootstrap : MonoBehaviour
    {
        public BalanceConfig Config;
        public bool AutoStart = true;
        public int StartStageIndex = 0;

        public BattleManager Battle { get; private set; }

        void Awake()
        {
            if (Config == null) Config = Resources.Load<BalanceConfig>("BalanceConfig");
            if (Config == null)
            {
                Debug.LogError("[TKS] BalanceConfig 자산이 없습니다. 메뉴 TKS/Setup Project 를 실행하세요.");
                return;
            }

            var cam = Camera.main;
            if (cam == null)
            {
                var cgo = new GameObject("Main Camera");
                cgo.tag = "MainCamera";
                cam = cgo.AddComponent<Camera>();
            }
            cam.orthographic = true;
            cam.clearFlags = CameraClearFlags.SolidColor;
            cam.backgroundColor = new Color(0.07f, 0.09f, 0.11f);
            cam.transform.position = new Vector3(0f, 0f, -10f);
            cam.nearClipPlane = 0.1f;
            cam.farClipPlane = 100f;
            var fit = cam.GetComponent<CameraFitter>();
            if (fit == null) fit = cam.gameObject.AddComponent<CameraFitter>();

            var board = new GameObject("Board").AddComponent<Board>();
            board.Build(Config.boardSize);
            fit.Board = board;
            fit.Fit();

            Battle = new GameObject("BattleManager").AddComponent<BattleManager>();
            Battle.Configure(Config, board);

            var hud = new GameObject("HUD").AddComponent<BattleHUD>();
            hud.Build(Battle, cam);
            Battle.Hud = hud;

            var input = new GameObject("SlingshotInput").AddComponent<SlingshotInput>();
            input.Init(Battle, cam, hud);
            Battle.Sling = input;

            if (AutoStart) Battle.StartStage(StartStageIndex);
        }
    }

    /// <summary>화면 비율이 달라도 전장 전체가 보이도록 직교 카메라 크기를 맞춘다.</summary>
    public class CameraFitter : MonoBehaviour
    {
        public Board Board;
        public float Margin = 0.5f;
        Camera cam;

        void Awake()
        {
            cam = GetComponent<Camera>();
        }

        void LateUpdate()
        {
            Fit();
        }

        public void Fit()
        {
            if (cam == null) cam = GetComponent<Camera>();
            if (Board == null || cam == null) return;
            float halfW = Board.Size.x * 0.5f + Margin;
            float halfH = Board.Size.y * 0.5f + Margin + 1.2f; // 위아래 HUD 여유
            float aspect = Mathf.Max(0.1f, cam.aspect);
            cam.orthographicSize = Mathf.Max(halfH, halfW / aspect);
        }
    }
}