using UnityEngine;
using AppleHills.Core.Settings;
using System;
using System.Collections.Generic;
using AppleHills.Core.Interfaces;
using Core;
using UI;

/// <summary>
/// Singleton manager for global game state and settings. Provides accessors for various gameplay parameters.
/// </summary>
public class GameManager : MonoBehaviour
{
    private static GameManager _instance;
    private static bool _isQuitting = false;

    /// <summary>
    /// Singleton instance of the GameManager.
    /// </summary>
    public static GameManager Instance
    {
        get
        {
            if (_instance == null && Application.isPlaying && !_isQuitting)
            {
                _instance = FindAnyObjectByType<GameManager>();
                if (_instance == null)
                {
                    var go = new GameObject("GameManager");
                    _instance = go.AddComponent<GameManager>();
                    // DontDestroyOnLoad(go);
                }
            }
            return _instance;
        }
    }

    [Header("Settings Status")]
    [SerializeField] private bool _settingsLoaded = false;
    [SerializeField] private bool _developerSettingsLoaded = false;
    public bool SettingsLoaded => _settingsLoaded;
    public bool DeveloperSettingsLoaded => _developerSettingsLoaded;
    
    [Header("Game State")]
    [SerializeField] private bool _isPaused = false;
    
    /// <summary>
    /// Current pause state of the game
    /// </summary>
    public bool IsPaused => _isPaused;
    
    // List of pausable components that have registered with the GameManager
    private List<IPausable> _pausableComponents = new List<IPausable>();
    
    // Events for pause state changes
    public event Action OnGamePaused;
    public event Action OnGameResumed;

    void Awake()
    {
        _instance = this;
        
        // Create settings provider if it doesn't exist
        SettingsProvider.Instance.gameObject.name = "Settings Provider";
        
        // Create developer settings provider if it doesn't exist
        DeveloperSettingsProvider.Instance.gameObject.name = "Developer Settings Provider";
        
        // Load all settings synchronously during Awake
        InitializeSettings();
        InitializeDeveloperSettings();
        
        // DontDestroyOnLoad(gameObject);
    }
    
    private void Start()
    {
        // Find and subscribe to PauseMenu events
        PauseMenu pauseMenu = PauseMenu.Instance;
        if (pauseMenu != null)
        {
            pauseMenu.OnGamePaused += OnPauseMenuPaused;
            pauseMenu.OnGameResumed += OnPauseMenuResumed;
            
            Logging.Debug("[GameManager] Subscribed to PauseMenu events");
        }
        else
        {
            Logging.Warning("[GameManager] PauseMenu not found. Pause functionality won't work properly.");
        }
    }
    
    private void OnDestroy()
    {
        // Unsubscribe from PauseMenu events
        PauseMenu pauseMenu = FindFirstObjectByType<PauseMenu>();
        if (pauseMenu != null)
        {
            pauseMenu.OnGamePaused -= OnPauseMenuPaused;
            pauseMenu.OnGameResumed -= OnPauseMenuResumed;
        }
    }

    /// <summary>
    /// Register a component as pausable, so it receives pause/resume notifications
    /// </summary>
    /// <param name="component">The pausable component to register</param>
    public void RegisterPausableComponent(IPausable component)
    {
        if (component != null && !_pausableComponents.Contains(component))
        {
            _pausableComponents.Add(component);
            
            // If the game is already paused, pause the component immediately
            if (_isPaused)
            {
                component.Pause();
            }
            
            Logging.Debug($"[GameManager] Registered pausable component: {(component as MonoBehaviour)?.name ?? "Unknown"}");
        }
    }
    
    /// <summary>
    /// Unregister a pausable component
    /// </summary>
    /// <param name="component">The pausable component to unregister</param>
    public void UnregisterPausableComponent(IPausable component)
    {
        if (component != null && _pausableComponents.Contains(component))
        {
            _pausableComponents.Remove(component);
            Logging.Debug($"[GameManager] Unregistered pausable component: {(component as MonoBehaviour)?.name ?? "Unknown"}");
        }
    }
    
    /// <summary>
    /// Called when the PauseMenu broadcasts a pause event
    /// </summary>
    private void OnPauseMenuPaused()
    {
        PauseGame();
    }
    
    /// <summary>
    /// Called when the PauseMenu broadcasts a resume event
    /// </summary>
    private void OnPauseMenuResumed()
    {
        ResumeGame();
    }
    
    /// <summary>
    /// Pause the game and notify all registered pausable components
    /// </summary>
    public void PauseGame()
    {
        if (_isPaused) return; // Already paused
        
        _isPaused = true;
        
        // Pause all registered components
        foreach (var component in _pausableComponents)
        {
            component.Pause();
        }
        
        // Broadcast pause event
        OnGamePaused?.Invoke();
        
        Logging.Debug($"[GameManager] Game paused. Paused {_pausableComponents.Count} components.");
    }
    
    /// <summary>
    /// Resume the game and notify all registered pausable components
    /// </summary>
    public void ResumeGame()
    {
        if (!_isPaused) return; // Already running
        
        _isPaused = false;
        
        // Resume all registered components
        foreach (var component in _pausableComponents)
        {
            component.DoResume();
        }
        
        // Broadcast resume event
        OnGameResumed?.Invoke();
        
        Logging.Debug($"[GameManager] Game resumed. Resumed {_pausableComponents.Count} components.");
    }
    
    /// <summary>
    /// Toggle the pause state of the game
    /// </summary>
    public void TogglePause()
    {
        if (_isPaused)
            ResumeGame();
        else
            PauseGame();
    }

    private void InitializeSettings()
    {
        Logging.Debug("Starting settings initialization...");
        
        // Load settings synchronously
        var playerSettings = SettingsProvider.Instance.LoadSettingsSynchronous<PlayerFollowerSettings>();
        var interactionSettings = SettingsProvider.Instance.LoadSettingsSynchronous<InteractionSettings>();
        var minigameSettings = SettingsProvider.Instance.LoadSettingsSynchronous<DivingMinigameSettings>();
        
        // Register settings with service locator
        if (playerSettings != null)
        {
            ServiceLocator.Register<IPlayerFollowerSettings>(playerSettings);
            Logging.Debug("PlayerFollowerSettings registered successfully");
        }
        else
        {
            Debug.LogError("Failed to load PlayerFollowerSettings");
        }
            
        if (interactionSettings != null)
        {
            ServiceLocator.Register<IInteractionSettings>(interactionSettings);
            Logging.Debug("InteractionSettings registered successfully");
        }
        else
        {
            Debug.LogError("Failed to load InteractionSettings");
        }
            
        if (minigameSettings != null)
        {
            ServiceLocator.Register<IDivingMinigameSettings>(minigameSettings);
            Logging.Debug("MinigameSettings registered successfully");
        }
        else
        {
            Debug.LogError("Failed to load MinigameSettings");
        }

        // Log success
        _settingsLoaded = playerSettings != null && interactionSettings != null && minigameSettings != null;
        if (_settingsLoaded)
        {
            Logging.Debug("All settings loaded and registered with ServiceLocator");
        }
        else
        {
            Logging.Warning("Some settings failed to load - check that all settings assets exist and are marked as Addressables");
        }
    }

    /// <summary>
    /// Check for and initialize developer settings.
    /// </summary>
    private void InitializeDeveloperSettings()
    {
        Logging.Debug("Starting developer settings initialization...");
        
        // Load developer settings
        var divingDevSettings = DeveloperSettingsProvider.Instance.GetSettings<DivingDeveloperSettings>();
        
        _developerSettingsLoaded = divingDevSettings != null;
        
        if (_developerSettingsLoaded)
        {
            Logging.Debug("All developer settings loaded successfully");
        }
        else
        {
            Logging.Warning("Some developer settings failed to load");
        }
    }

    void OnApplicationQuit()
    {
        _isQuitting = true;
        ServiceLocator.Clear();
    }

    // Helper method to get settings
    private T GetSettings<T>() where T : class
    {
        return ServiceLocator.Get<T>();
    }

    /// <summary>
    /// Returns the entire settings object of specified type.
    /// </summary>
    /// <typeparam name="T">Type of settings to retrieve</typeparam>
    /// <returns>The settings object or null if not found</returns>
    public static T GetSettingsObject<T>() where T : class
    {
        return Instance?.GetSettings<T>();
    }
    
    /// <summary>
    /// Returns the developer settings object of specified type.
    /// </summary>
    /// <typeparam name="T">Type of developer settings to retrieve</typeparam>
    /// <returns>The developer settings object or null if not found</returns>
    public static T GetDeveloperSettings<T>() where T : BaseDeveloperSettings
    {
        return DeveloperSettingsProvider.Instance?.GetSettings<T>();
    }
    
    // LEFTOVER LEGACY SETTINGS
    public float PlayerStopDistance => GetSettings<IInteractionSettings>()?.PlayerStopDistance ?? 6.0f;
    public float PlayerStopDistanceDirectInteraction => GetSettings<IInteractionSettings>()?.PlayerStopDistanceDirectInteraction ?? 2.0f;
    public float DefaultPuzzlePromptRange => GetSettings<IInteractionSettings>()?.DefaultPuzzlePromptRange ?? 3.0f;
}