using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

namespace Ironspore.Editor
{
    // Editor-only integration checks and real Game View captures, invoked through Unity MCP.
    public static class LocalizationSmoke
    {
        const string Folder = "Docs/QA/Localization";
        static readonly List<Action> steps = new List<Action>();
        static readonly Dictionary<string, byte[]> rangeFiles = new Dictionary<string, byte[]>();
        static Result result;
        static GameSession game;
        static string preference, mainState;
        static bool hadPreference;
        static int initialChassis, step;
        static int[] initialEquipment;
        static float nextAt;
        static VisualElement Root => game.Hud.GetComponent<UIDocument>().rootVisualElement;
        static string MainPath => Path.Combine(Application.persistentDataPath, "Ironspore", "profile.json");
        static byte[] mainBytes;

        [Serializable]
        public sealed class Check
        {
            public string name;
            public bool passed;
        }
        [Serializable]
        public sealed class Result
        {
            public bool passed;
            public int stepsCompleted;
            public string error;
            public List<Check> checks = new List<Check>();
        }
        static void CheckThat(string name, bool condition)
        {
            result.checks.Add(new Check { name = name, passed = condition });
            if (!condition)
                throw new InvalidOperationException(name);
        }
        static void Submit(string name)
        {
            var button = Root.Q<Button>(name);
            if (button == null)
                throw new InvalidOperationException("Missing UI button: " + name);
            button.Focus();
            using (var evt = NavigationSubmitEvent.GetPooled())
            {
                evt.target = button;
                button.SendEvent(evt);
            }
        }
        static void Capture(string name)
        {
            ScreenCapture.CaptureScreenshot(Path.GetFullPath(Folder + "/Screenshots/" + name + ".png"));
        }
        static void Key(string key, bool shift = false)
        {
            var input = Event.KeyboardEvent(key);
            if (shift)
                input.modifiers |= EventModifiers.Shift;
            using (var evt = KeyDownEvent.GetPooled(input))
            {
                var target = Root.focusController.focusedElement as VisualElement ?? Root;
                evt.target = target;
                target.SendEvent(evt);
            }
        }
        static void CheckBounds(int width, int height)
        {
            string name = width + "x" + height;
            CheckThat(name + " is the actual render resolution", Screen.width == width && Screen.height == height);
            var outer = Root.worldBound;
            var button = Root.Q<Button>("language-toggle").worldBound;
            CheckThat(name + " button remains bottom-right", button.width > 200 && button.xMin > outer.center.x && button.xMax <= outer.xMax && button.yMax <= outer.yMax && outer.xMax - button.xMax < 80 && outer.yMax - button.yMax < 80);
        }
        public static string Begin()
        {
            if (!EditorApplication.isPlaying || !GameSession.Active || GameSession.Active.InField)
                throw new InvalidOperationException("Run the localization smoke from the playing hangar.");
            if (result != null)
                throw new InvalidOperationException("Localization smoke is already active.");
            game = GameSession.Active;
            result = new Result();
            hadPreference = PlayerPrefs.HasKey(GameLocalization.PreferenceKey);
            preference = PlayerPrefs.GetString(GameLocalization.PreferenceKey, "");
            mainState = JsonUtility.ToJson(game.Store.Data);
            mainBytes = File.Exists(MainPath) ? File.ReadAllBytes(MainPath) : null;
            initialChassis = game.SelectedChassis;
            initialEquipment = (int[])game.InitialEquipment.Clone();
            rangeFiles.Clear();
            string range = Path.Combine(Application.persistentDataPath, "Ironspore", "range.json");
            foreach (string path in new[] { range, range + ".bak", range + ".tmp" })
                rangeFiles[path] = File.Exists(path) ? File.ReadAllBytes(path) : null;
            Directory.CreateDirectory(Folder + "/Screenshots");
            Directory.CreateDirectory(Folder + "/TestResults");
            Application.runInBackground = true;
            SetResolution(1920, 1080);
            game.SelectedChassis = 0;
            game.InitialEquipment[2] = 1;
            var world = GameObject.Find("World");
            for (int i = 0; i < 30; i++)
                GameLocalization.SelectLocale(i % 2 == 0 ? "zh-Hans" : "en", false);
            CheckThat("30 locale changes preserve chassis and loadout", game.SelectedChassis == 0 && game.InitialEquipment[2] == 1);
            CheckThat("30 locale changes do not recreate the world", GameObject.Find("World") == world);
            CheckThat("30 locale changes do not duplicate the language button", Root.Query<Button>("language-toggle").ToList().Count == 1);
            CheckThat("30 locale changes do not mutate save data", mainState == JsonUtility.ToJson(game.Store.Data));
            steps.Clear();
            steps.Add(() => { CheckBounds(1920, 1080); Capture("hangar-en-1080"); });
            steps.Add(() => Submit("language-toggle"));
            steps.Add(() => { CheckThat("Submit opens language menu", Root.Q("language-menu") != null); Capture("language-menu-en"); });
            steps.Add(() => Submit("locale-zh-Hans"));
            steps.Add(() =>
            {
                CheckThat("Menu choice immediately switches and persists", GameLocalization.CurrentCode == "zh-Hans" && PlayerPrefs.GetString(GameLocalization.PreferenceKey) == "zh-Hans");
                CheckThat("Menu closes and restores toggle focus", Root.Q("language-menu") == null && Root.focusController.focusedElement == Root.Q<Button>("language-toggle"));
                Capture("hangar-zh-1080");
            });
            steps.Add(() =>
            {
                Submit("language-toggle");
                using (var evt = KeyDownEvent.GetPooled(Event.KeyboardEvent("escape")))
                {
                    evt.target = Root.Q<Button>("locale-zh-Hans");
                    Root.SendEvent(evt);
                }
                CheckThat("Escape dismisses the menu", Root.Q("language-menu") == null);
            });
            steps.Add(() => Key("return"));
            steps.Add(() =>
            {
                CheckThat("Enter opens focused language toggle", Root.Q("language-menu") != null);
                Key("tab");
                CheckThat("Tab moves focus to English", Root.focusController.focusedElement == Root.Q<Button>("locale-en"));
            });
            steps.Add(() => Key("space"));
            steps.Add(() =>
            {
                CheckThat("Space selects focused locale", GameLocalization.CurrentCode == "en" && Root.Q("language-menu") == null);
                Key("space");
            });
            steps.Add(() =>
            {
                CheckThat("Space opens focused language toggle", Root.Q("language-menu") != null);
                Key("tab", true);
                CheckThat("Shift Tab moves focus to Chinese", Root.focusController.focusedElement == Root.Q<Button>("locale-zh-Hans"));
            });
            steps.Add(() => Key("return"));
            steps.Add(() => CheckThat("Enter selects focused locale", GameLocalization.CurrentCode == "zh-Hans" && Root.Q("language-menu") == null));
            foreach (var resolution in new[] { new Vector2Int(1280, 720), new Vector2Int(2560, 1440), new Vector2Int(2560, 1080) })
            {
                var size = resolution;
                steps.Add(() => SetResolution(size.x, size.y));
                steps.Add(() => { CheckBounds(size.x, size.y); Capture("hangar-zh-" + size.x + "x" + size.y); });
            }
            steps.Add(() =>
            {
                SetResolution(1920, 1080);
                game.StartTrial();
                game.SetMenu(true);
                game.Store.AddCargo("alloy", 4);
                game.Store.AddCargo("blueprint_coil_capacitor", 1);
            });
            AddPair("hud", game.Hud.ShowField, false);
            AddPair("cargo", game.Hud.ShowCargo, true);
            AddPair("refit", () => game.Hud.ShowPart(2, 1), true);
            AddPair("routes", game.Hud.ShowRoutes, true);
            AddPair("pause", game.Hud.ShowPause, true);
            steps.Add(() => { game.CloseMenu(); game.EndSortie(true); GameLocalization.SelectLocale("zh-Hans", false); });
            steps.Add(() => Capture("report-zh"));
            steps.Add(() => GameLocalization.SelectLocale("en", false));
            steps.Add(() =>
            {
                Capture("report-en");
                CheckThat("Existing report follows locale", game.Report.StartsWith("Driving range complete"));
                CheckThat("Formal inventory and receipts remain unchanged", mainState == JsonUtility.ToJson(game.Store.Data));
                CheckThat("Formal profile file remains byte-for-byte unchanged", mainBytes == null ? !File.Exists(MainPath) : mainBytes.SequenceEqual(File.ReadAllBytes(MainPath)));
            });
            step = 0;
            nextAt = Time.realtimeSinceStartup + .7f;
            EditorApplication.update += Tick;
            return "Localization integration checks and screenshots started; results in about 20 seconds.";
        }
        static void AddPair(string name, Action show, bool overlay)
        {
            steps.Add(() => { GameLocalization.SelectLocale("en", false); show(); });
            steps.Add(() =>
            {
                Capture(name + "-en");
            });
            steps.Add(() =>
            {
                var world = GameObject.Find("World");
                var before = JsonUtility.ToJson(game.Run);
                GameLocalization.SelectLocale("zh-Hans", false);
                CheckThat(name + " switch preserves world and cargo", world == GameObject.Find("World") && before == JsonUtility.ToJson(game.Run));
                CheckThat(name + " switch preserves UI context", overlay == (Root.Q(className: "overlay") != null));
                CheckThat(name + " refreshes existing world signs", UnityEngine.Object.FindObjectsByType<TextMesh>().Any(x => x.text == "撤离点"));
            });
            steps.Add(() => Capture(name + "-zh"));
        }
        static void Tick()
        {
            if (Time.realtimeSinceStartup < nextAt)
                return;
            try
            {
                if (!EditorApplication.isPlaying || !game)
                    throw new InvalidOperationException("Play mode ended during localization smoke.");
                if (step >= steps.Count)
                {
                    result.passed = true;
                    Finish();
                    return;
                }
                steps[step++]();
                result.stepsCompleted = step;
                nextAt = Time.realtimeSinceStartup + .55f;
            }
            catch (Exception ex)
            {
                result.error = ex.ToString();
                Finish();
            }
        }
        static void Finish()
        {
            EditorApplication.update -= Tick;
            if (game)
            {
                if (game.InField && game.Trial)
                    game.EndSortie(true);
                game.SelectedChassis = initialChassis;
                game.InitialEquipment = initialEquipment;
                if (hadPreference)
                    PlayerPrefs.SetString(GameLocalization.PreferenceKey, preference);
                else
                    PlayerPrefs.DeleteKey(GameLocalization.PreferenceKey);
                PlayerPrefs.Save();
                GameLocalization.Initialize(game.localization);
                game.Hud.ShowHangar();
            }
            // Restore only the three explicit trial files, after the trial session has closed.
            foreach (var entry in rangeFiles)
            {
                if (entry.Value != null)
                    File.WriteAllBytes(entry.Key, entry.Value);
                else if (File.Exists(entry.Key))
                    File.Delete(entry.Key);
            }
            File.WriteAllText(Folder + "/TestResults/Integration.json", JsonUtility.ToJson(result, true));
            result = null;
        }
        public static void SetResolution(int width, int height)
        {
            var assembly = typeof(UnityEditor.Editor).Assembly;
            var type = assembly.GetType("UnityEditor.GameViewSizes");
            var instance = typeof(ScriptableSingleton<>).MakeGenericType(type).GetProperty("instance").GetValue(null);
            var group = type.GetMethod("GetGroup").Invoke(instance, new[] { Enum.ToObject(assembly.GetType("UnityEditor.GameViewSizeGroupType"), 0) });
            int count = (int)group.GetType().GetMethod("GetTotalCount").Invoke(group, null);
            int index = count;
            for (int i = 0; i < count; i++)
            {
                var existing = group.GetType().GetMethod("GetGameViewSize").Invoke(group, new object[] { i });
                if ((int)existing.GetType().GetProperty("width").GetValue(existing) == width && (int)existing.GetType().GetProperty("height").GetValue(existing) == height)
                {
                    index = i;
                    break;
                }
            }
            if (index == count)
            {
                var size = Activator.CreateInstance(assembly.GetType("UnityEditor.GameViewSize"), BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, new object[] { Enum.Parse(assembly.GetType("UnityEditor.GameViewSizeType"), "FixedResolution"), width, height, "Ironspore QA " + width + "x" + height }, null);
                group.GetType().GetMethod("AddCustomSize").Invoke(group, new[] { size });
            }
            var view = EditorWindow.GetWindow(assembly.GetType("UnityEditor.GameView"));
            view.GetType().GetProperty("selectedSizeIndex", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).SetValue(view, index);
            view.Focus();
        }
    }
}