using UnityEngine;
using UnityEngine.UI;
#if UNITY_EDITOR
using UnityEditor;
using TMPro;
#else
using TMPro;
#endif

namespace MegaKoop.UI
{
    /// <summary>
    /// UGUI Main Menu controller (no UI Toolkit). Handles switching panels and basic settings.
    /// </summary>
    public class UGUIMainMenuController : MonoBehaviour
    {
        // Panels
        [Header("Optional Panel Refs (assign to override auto-find)")]
        [SerializeField] private GameObject panelMainRef;
        [SerializeField] private GameObject panelSettingsRef;
        [SerializeField] private GameObject panelLobbyRef;

        private GameObject panelMain;
        private GameObject panelSettings;
        private GameObject panelLobby;

        // Main buttons
        private Button btnNewGame;
        private Button btnContinue;
        private Button btnMultiplayer;
        private Button btnSettings;
        private Button btnQuit;

        // Settings controls
        private TMP_Dropdown ddQuality;
        private Toggle tgFullscreen;
        private TMP_Dropdown ddResolution;
        private Button btnApplySettings;
        private Button btnBackFromSettings;

        private void Awake()
        {
            // Panels (created by UGUIMenuBuilder) – najdi i když jsou neaktivní
            RefreshPanelReferences();

            // Buttons
            btnNewGame = FindButton("Button_NewGame");
            btnContinue = FindButton("Button_Continue");
            btnMultiplayer = FindButton("Button_Multiplayer");
            btnSettings = FindButton("Button_Settings");
            btnQuit = FindButton("Button_Quit");

            // Settings
            ddQuality = FindDropdown("Dropdown_Quality");
            tgFullscreen = FindToggle("Toggle_Fullscreen");
            ddResolution = FindDropdown("Dropdown_Resolution");
            btnApplySettings = FindButton("Button_ApplySettings");
            btnBackFromSettings = FindButton("Button_BackFromSettings");

            WireEvents();

            // Ensure initial panels
            ShowMainMenu();
        }

        // Allow UGUIMenuBuilder to inject panel refs directly
        public void SetPanels(GameObject main, GameObject settings, GameObject lobby)
        {
            panelMainRef = main;
            panelSettingsRef = settings;
            panelLobbyRef = lobby;
            RefreshPanelReferences();
        }

        private void RefreshPanelReferences()
        {
            panelMain = panelMainRef ? panelMainRef : (FindAnyInScene("Panel_MainMenu") ?? panelMain);
            panelSettings = panelSettingsRef ? panelSettingsRef : (FindAnyInScene("Panel_Settings") ?? panelSettings);
            panelLobby = panelLobbyRef ? panelLobbyRef : (FindAnyInScene("Panel_Lobby") ?? panelLobby);
        }

        private GameObject FindAnyInScene(string name)
        {
            // Najde i neaktivní objekty
            var all = Resources.FindObjectsOfTypeAll<Transform>();
            foreach (var t in all)
            {
                if (t.hideFlags != HideFlags.None) continue;
                var go = t.gameObject;
                if (!go.scene.IsValid() || !go.scene.isLoaded) continue;
                if (go.name == name) return go;
            }
            return null;
        }

        private Button FindButton(string name)
        {
            var go = GameObject.Find(name);
            return go ? go.GetComponent<Button>() : null;
        }
        private TMP_Dropdown FindDropdown(string name)
        {
            var go = GameObject.Find(name);
            return go ? go.GetComponent<TMP_Dropdown>() : null;
        }
        private Toggle FindToggle(string name)
        {
            var go = GameObject.Find(name);
            return go ? go.GetComponent<Toggle>() : null;
        }

        private void WireEvents()
        {
            if (btnNewGame) btnNewGame.onClick.AddListener(OnNewGame);
            if (btnContinue) btnContinue.onClick.AddListener(OnContinue);
            if (btnMultiplayer) btnMultiplayer.onClick.AddListener(OnOpenMultiplayer);
            if (btnSettings) btnSettings.onClick.AddListener(OnOpenSettings);
            if (btnQuit) btnQuit.onClick.AddListener(OnQuit);

            if (btnApplySettings) btnApplySettings.onClick.AddListener(ApplySettings);
            if (btnBackFromSettings) btnBackFromSettings.onClick.AddListener(ShowMainMenu);
        }

        private void ShowMainMenu()
        {
            if (panelMain) panelMain.SetActive(true);
            if (panelSettings) panelSettings.SetActive(false);
            if (panelLobby) panelLobby.SetActive(false);
        }

        private void OnOpenMultiplayer()
        {
            RefreshPanelReferences();
            bool showed = false;
            if (panelLobby)
            {
                if (panelMain) panelMain.SetActive(false);
                if (panelSettings) panelSettings.SetActive(false);
                panelLobby.SetActive(true);
                showed = true;
            }
            UGUIMultiplayerLobbyController lobby;
#if UNITY_2023_1_OR_NEWER
            lobby = Object.FindFirstObjectByType<UGUIMultiplayerLobbyController>();
#else
            lobby = Object.FindObjectOfType<UGUIMultiplayerLobbyController>();
#endif
            if (lobby && showed) lobby.QuickHost(4, true);
            if (!showed)
            {
                Debug.LogError("[UGUIMainMenu] Panel_Lobby not found in scene. Did you run Tools > MegaKoop > Generate UGUI Main Menu?" );
                if (panelMain) panelMain.SetActive(true);
            }
        }

        private void OnOpenSettings()
        {
            if (panelMain) panelMain.SetActive(false);
            if (panelSettings) panelSettings.SetActive(true);
            if (panelLobby) panelLobby.SetActive(false);
        }

        private void OnNewGame()
        {
            // Co-op only: quick host path
            UGUIMultiplayerLobbyController lobby;
#if UNITY_2023_1_OR_NEWER
            lobby = Object.FindFirstObjectByType<UGUIMultiplayerLobbyController>();
#else
            lobby = Object.FindObjectOfType<UGUIMultiplayerLobbyController>();
#endif
            if (lobby)
            {
                if (panelMain) panelMain.SetActive(false);
                if (panelSettings) panelSettings.SetActive(false);
                if (panelLobby) panelLobby.SetActive(true);
                lobby.QuickHost(4, true);
            }
        }

        private void OnContinue()
        {
            // Co-op only: join path
            UGUIMultiplayerLobbyController lobby;
#if UNITY_2023_1_OR_NEWER
            lobby = Object.FindFirstObjectByType<UGUIMultiplayerLobbyController>();
#else
            lobby = Object.FindObjectOfType<UGUIMultiplayerLobbyController>();
#endif
            if (lobby)
            {
                if (panelMain) panelMain.SetActive(false);
                if (panelSettings) panelSettings.SetActive(false);
                if (panelLobby) panelLobby.SetActive(true);
                lobby.ShowJoinTabPublic();
            }
        }

        private void OnQuit()
        {
#if UNITY_EDITOR
            EditorApplication.isPlaying = false;
#else
            Application.Quit();
#endif
        }

        private void ApplySettings()
        {
            if (ddQuality)
            {
                QualitySettings.SetQualityLevel(ddQuality.value, true);
            }
            if (tgFullscreen)
            {
                Screen.fullScreen = tgFullscreen.isOn;
            }
            if (ddResolution)
            {
                var opt = ddResolution.options[ddResolution.value].text; // e.g., "1920x1080"
                var parts = opt.ToLower().Split('x');
                if (parts.Length == 2 && int.TryParse(parts[0], out int w) && int.TryParse(parts[1], out int h))
                {
                    Screen.SetResolution(w, h, Screen.fullScreenMode);
                }
            }
        }
    }
}