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

namespace Core
{
    /// <summary>
    /// Singleton manager for global game state and settings. Provides accessors for various gameplay parameters.
    /// </summary>
    public class GameManager : MonoBehaviour
    {
        // Singleton implementation
        private static GameManager _instance;
        public static GameManager Instance => _instance;
        private static bool _isQuitting = false;
        
        private bool _settingsLoaded = false;
        private bool _developerSettingsLoaded = false;
        
        // Pausable implementation
        private bool _isPaused = false;
        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 providers if it doesn't exist
            SettingsProvider.Instance.gameObject.name = "Settings Provider";
            DeveloperSettingsProvider.Instance.gameObject.name = "Developer Settings Provider";
        
            // Load all settings synchronously during Awake
            InitializeSettings();
            InitializeDeveloperSettings();
        
            // Register for post-boot initialization
            BootCompletionService.RegisterInitAction(InitializePostBoot);
        
            // DontDestroyOnLoad(gameObject);
        }
    
        private void InitializePostBoot()
        {
            // For post-boot correct initialization order
        }

        /// <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"}");
            }
        }
    
        // TODO: Revisit this with proper pause menu request implementation
        public void RequestGamePause()
        {
            PauseGame();
        }

        public void RequestGameResume()
        {
            ResumeGame();
        }
    
        /// <summary>
        /// Pause the game and notify all registered pausable components
        /// </summary>
        private 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>
        private 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.");
        }

        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;
    }
}