using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

namespace VS.EditorTools
{
    // GUI 에디터를 열면 Game 뷰를 세로 720×1280 으로 맞춘다(내부 API 리플렉션 · 실패 시 경고만). LDClone 도구와 같은 방식.
    [InitializeOnLoad]
    static class GameViewPortrait
    {
        const string Label = "VS Portrait 720x1280";
        const int Wd = 720, Ht = 1280;

        static GameViewPortrait()
        {
            if (Application.isBatchMode) return;
            EditorApplication.delayCall += () => Apply(false);
        }

        [MenuItem("VS/Game 뷰 세로 720x1280")]
        static void ApplyMenu() => Apply(true);

        static void Apply(bool verbose)
        {
            try
            {
                var asm = typeof(Editor).Assembly;
                var sizesType = asm.GetType("UnityEditor.GameViewSizes");
                var single = typeof(ScriptableSingleton<>).MakeGenericType(sizesType);
                var instance = single.GetProperty("instance").GetValue(null);
                var groupType = sizesType.GetProperty("currentGroupType").GetValue(instance);
                var group = sizesType.GetMethod("GetGroup").Invoke(instance, new[] { groupType });
                var gt = group.GetType();
                int total = (int)gt.GetMethod("GetTotalCount").Invoke(group, null);
                int idx = -1;
                for (int i = 0; i < total; i++)
                {
                    var sz = gt.GetMethod("GetGameViewSize").Invoke(group, new object[] { i });
                    if ((string)sz.GetType().GetProperty("baseText").GetValue(sz) == Label) { idx = i; break; }
                }
                if (idx < 0)
                {
                    var sizeT = asm.GetType("UnityEditor.GameViewSize");
                    var kindT = asm.GetType("UnityEditor.GameViewSizeType");
                    var ctor = sizeT.GetConstructor(new[] { kindT, typeof(int), typeof(int), typeof(string) });
                    var size = ctor.Invoke(new object[] { Enum.Parse(kindT, "FixedResolution"), Wd, Ht, Label });
                    gt.GetMethod("AddCustomSize").Invoke(group, new[] { size });
                    idx = (int)gt.GetMethod("GetTotalCount").Invoke(group, null) - 1;
                }
                var gvType = asm.GetType("UnityEditor.GameView");
                foreach (var w in Resources.FindObjectsOfTypeAll(gvType))
                {
                    var prop = gvType.GetProperty("selectedSizeIndex", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
                    if (prop != null && prop.CanWrite) prop.SetValue(w, idx);
                    else gvType.GetMethod("SizeSelectionCallback", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)?.Invoke(w, new object[] { idx, null });
                    ((EditorWindow)w).Repaint();
                }
                if (verbose) Debug.Log("[VS] Game 뷰 = " + Label);
            }
            catch (Exception e) { Debug.LogWarning("[VS] Game 뷰 세로 설정 실패(수동으로 720x1280 선택): " + e.Message); }
        }
    }
}