using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;

public class UIController : MonoBehaviour
{
    [Header("UI Panels")]
    [SerializeField] private GameObject buildingPanel;
    [SerializeField] private GameObject gameInfoPanel;
    [SerializeField] private GameObject roomSelectionPanel;

    [Header("Game Info Display")]
    [SerializeField] private Text speedText;
    [SerializeField] private Text gameStateText;
    [SerializeField] private Text instructionsText;

    [Header("Building Controls")]
    [SerializeField] private Button buildRoomButton;
    [SerializeField] private Button cancelBuildingButton;
    [SerializeField] private Dropdown roomTypeDropdown;

    [Header("Hotel Management")]
    [SerializeField] private Button openHotelButton;
    [SerializeField] private Text hotelRequirementsText;

    [Header("Error/Warning Display")]
    [SerializeField] private GameObject errorPanel;
    [SerializeField] private Text errorText;
    [SerializeField] private Button errorCloseButton;

    private RoomBuilder roomBuilder;
    private bool isUISetup = false;

    private void Start()
    {
        SetupUI();
        SubscribeToEvents();
    }

    private void OnDestroy()
    {
        UnsubscribeFromEvents();
    }

    private void SetupUI()
    {
        // Find RoomBuilder in scene
        roomBuilder = FindObjectOfType<RoomBuilder>();

        // Setup button events
        if (buildRoomButton != null)
            buildRoomButton.onClick.AddListener(StartBuildingRoom);

        if (cancelBuildingButton != null)
        {
            cancelBuildingButton.onClick.AddListener(CancelBuilding);
            cancelBuildingButton.gameObject.SetActive(false);
        }

        if (openHotelButton != null)
        {
            openHotelButton.onClick.AddListener(TryOpenHotel);
            openHotelButton.interactable = false;
        }

        if (errorCloseButton != null)
            errorCloseButton.onClick.AddListener(CloseErrorPanel);

        if (errorPanel != null)
            errorPanel.SetActive(false);

        // Setup room type dropdown
        SetupRoomTypeDropdown();

        isUISetup = true;
        UpdateUI();
    }

    private void SetupRoomTypeDropdown()
    {
        if (roomTypeDropdown != null)
        {
            roomTypeDropdown.ClearOptions();
            List<string> roomTypes = new List<string>();

            foreach (RoomType roomType in System.Enum.GetValues(typeof(RoomType)))
            {
                roomTypes.Add(roomType.ToString());
            }

            roomTypeDropdown.AddOptions(roomTypes);
        }
    }

    private void SubscribeToEvents()
    {
        if (GameManager.Instance != null)
        {
            GameManager.OnSpeedChanged += UpdateSpeedDisplay;
            GameManager.OnGameStateChanged += UpdateGameStateDisplay;
        }

        if (roomBuilder != null)
        {
            roomBuilder.OnRoomCompleted += OnRoomCompleted;
            roomBuilder.OnBuildingError += ShowError;
        }
    }

    private void UnsubscribeFromEvents()
    {
        if (GameManager.Instance != null)
        {
            GameManager.OnSpeedChanged -= UpdateSpeedDisplay;
            GameManager.OnGameStateChanged -= UpdateGameStateDisplay;
        }

        if (roomBuilder != null)
        {
            roomBuilder.OnRoomCompleted -= OnRoomCompleted;
            roomBuilder.OnBuildingError -= ShowError;
        }
    }

    private void Update()
    {
        if (isUISetup)
        {
            UpdateUI();
        }
    }

    #region UI Updates
    private void UpdateUI()
    {
        UpdateInstructionsText();
        UpdateHotelRequirements();
        UpdateBuildingControls();
    }

    private void UpdateInstructionsText()
    {
        if (instructionsText == null) return;

        if (roomBuilder != null && roomBuilder.IsBuilding())
        {
            instructionsText.text = "Building Mode:\n" +
                                  "• Left click to place wall points\n" +
                                  "• Right click to complete room (if possible)\n" +
                                  "• Get close to start point to auto-complete\n" +
                                  "• After walls, click on a wall to place door\n" +
                                  "• ESC to cancel";
        }
        else if (GameManager.Instance != null)
        {
            switch (GameManager.Instance.currentGameState)
            {
                case GameManager.GameState.Building:
                    instructionsText.text = "Building Phase:\n" +
                                          "• Build rooms for your hotel\n" +
                                          "• Add entrance and reception to open\n" +
                                          "• Keys 1-4 control game speed\n" +
                                          "• Start building with the button below";
                    break;
                case GameManager.GameState.PreOpening:
                    instructionsText.text = "Ready to Open:\n" +
                                          "• All requirements met!\n" +
                                          "• Click 'Open Hotel' to start operations\n" +
                                          "• Keys 1-4 control game speed";
                    break;
                case GameManager.GameState.Operating:
                    instructionsText.text = "Hotel Operating:\n" +
                                          "• Guests are now arriving\n" +
                                          "• Manage your hotel operations\n" +
                                          "• Keys 1-4 control game speed";
                    break;
            }
        }
    }

    private void UpdateHotelRequirements()
    {
        if (hotelRequirementsText == null || GameManager.Instance == null) return;

        string requirements = "Hotel Requirements:\n";
        requirements += $"• Entrance: {(GameManager.Instance.hasEntrance ? "✓" : "✗")}\n";
        requirements += $"• Reception: {(GameManager.Instance.hasReception ? "✓" : "✗")}\n";

        if (GameManager.Instance.canOpenHotel)
        {
            requirements += "\n<color=green>Ready to open!</color>";
        }

        hotelRequirementsText.text = requirements;

        // Update open hotel button
        if (openHotelButton != null)
        {
            openHotelButton.interactable = GameManager.Instance.canOpenHotel &&
                                         GameManager.Instance.currentGameState == GameManager.GameState.PreOpening;
        }
    }

    private void UpdateBuildingControls()
    {
        if (buildRoomButton == null || cancelBuildingButton == null) return;

        bool isBuilding = roomBuilder != null && roomBuilder.IsBuilding();

        buildRoomButton.gameObject.SetActive(!isBuilding);
        cancelBuildingButton.gameObject.SetActive(isBuilding);

        // Disable building if hotel is operating
        if (GameManager.Instance != null && GameManager.Instance.IsHotelOperating())
        {
            buildRoomButton.interactable = false;
        }
    }

    private void UpdateSpeedDisplay(GameManager.GameSpeed speed)
    {
        if (speedText != null)
        {
            speedText.text = $"Speed: {speed} ({Time.timeScale}x)";
        }
    }

    private void UpdateGameStateDisplay(GameManager.GameState state)
    {
        if (gameStateText != null)
        {
            gameStateText.text = $"State: {state}";
        }
    }
    #endregion

    #region Button Events
    private void StartBuildingRoom()
    {
        Debug.Log("Starting room building mode");
        // RoomBuilder will handle the building logic through mouse input
    }

    private void CancelBuilding()
    {
        if (roomBuilder != null)
        {
            // RoomBuilder handles cancellation through ESC key, 
            // but we can trigger it programmatically too
            Debug.Log("Cancelling building mode via UI");
        }
    }

    private void TryOpenHotel()
    {
        if (GameManager.Instance != null)
        {
            GameManager.Instance.OpenHotel();
        }
    }

    private void OnRoomCompleted(Room room)
    {
        Debug.Log($"Room completed: {room.roomType}");

        // Check if this room satisfies hotel requirements
        RoomType selectedType = (RoomType)roomTypeDropdown.value;
        room.roomType = selectedType;

        switch (selectedType)
        {
            case RoomType.Reception:
                if (GameManager.Instance != null)
                    GameManager.Instance.SetReception(true);
                break;
            case RoomType.Lobby:
                if (GameManager.Instance != null)
                    GameManager.Instance.SetEntrance(true);
                break;
        }

        ShowMessage($"Room completed: {selectedType}");
    }

    private void ShowError(string errorMessage)
    {
        if (errorPanel != null && errorText != null)
        {
            errorText.text = errorMessage;
            errorPanel.SetActive(true);
            Debug.LogWarning($"Building Error: {errorMessage}");
        }
    }

    private void ShowMessage(string message)
    {
        Debug.Log(message);
        // You can create a message panel similar to error panel for positive feedback
    }

    private void CloseErrorPanel()
    {
        if (errorPanel != null)
        {
            errorPanel.SetActive(false);
        }
    }
    #endregion
}