using System;
using UnityEngine;
using Random = UnityEngine.Random;

namespace MedievalShopkeeper
{
    public enum GameEvent
    {
        None,
        GoblinRobber,
        ShopRaid,
        Plague,
        MarketBoom,
        DeliveryArrived
    }

    public class GameManager : MonoBehaviour
    {
        public static GameManager Instance { get; private set; }

        [Header("Time Settings")]
        [Tooltip("How many in-game minutes pass per real-life second? (Default: 1 real second = 1 game minute)")]
        [SerializeField] private float inGameMinutesPerRealSecond = 1f;
        [SerializeField] private int startHour = 7;
        [SerializeField] private int startMinute = 0;
        
        [Header("Shop Hours")]
        [SerializeField] private bool autoManageShopHours = true;
        [SerializeField] private int shopOpenHour = 8;
        [SerializeField] private int shopCloseHour = 18;

        [Header("Economy")]
        [SerializeField] private int startingMoney = 100;

        [Header("Random Events")]
        [Tooltip("Percentage chance to trigger a random event every in-game hour.")]
        [Range(0f, 100f)]
        [SerializeField] private float hourlyEventChance = 5f;

        // State properties
        public int CurrentHour { get; private set; }
        public int CurrentMinute { get; private set; }
        public int CurrentMoney { get; private set; }
        public int CurrentCustomersInShop { get; private set; }
        public bool IsShopOpen { get; private set; }

        // Events
        public event Action<int, int> OnTimeChanged; // Hour, Minute
        public event Action<int> OnMoneyChanged;     // New Balance
        public event Action<bool> OnShopStateChanged; // IsOpen
        public event Action<int> OnCustomerCountChanged; // Current Customers
        public event Action<GameEvent> OnRandomEventTriggered; // The Event

        private float timeAccumulator = 0f;
        private int lastEvaluatedHour = -1;

        private void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }
            Instance = this;
            
            // Initialize state
            CurrentHour = startHour;
            CurrentMinute = startMinute;
            CurrentMoney = startingMoney;
            CurrentCustomersInShop = 0;
            IsShopOpen = false;
        }

        private void Start()
        {
            // Initial broadcasts
            OnTimeChanged?.Invoke(CurrentHour, CurrentMinute);
            OnMoneyChanged?.Invoke(CurrentMoney);
            OnShopStateChanged?.Invoke(IsShopOpen);
            OnCustomerCountChanged?.Invoke(CurrentCustomersInShop);
        }

        private void Update()
        {
            UpdateTime();
        }

        #region Time Management

        public bool IsNightTime => CurrentHour >= shopCloseHour || CurrentHour < shopOpenHour;

        private void UpdateTime()
        {
            // Night time is 10x faster so the player doesn't have to wait a full hour real-time with no customers
            float timeMultiplier = (IsNightTime && !IsShopOpen) ? 10f : 1f;

            // Calculate time progression
            timeAccumulator += Time.deltaTime * (inGameMinutesPerRealSecond * timeMultiplier);

            if (timeAccumulator >= 1f)
            {
                int minutesPassed = Mathf.FloorToInt(timeAccumulator);
                timeAccumulator -= minutesPassed;

                AdvanceTime(minutesPassed);
            }
        }

        private void AdvanceTime(int minutes)
        {
            CurrentMinute += minutes;

            while (CurrentMinute >= 60)
            {
                CurrentMinute -= 60;
                CurrentHour++;

                if (CurrentHour >= 24)
                {
                    CurrentHour = 0;
                    OnDayPassed();
                }

                OnHourPassed();
            }

            OnTimeChanged?.Invoke(CurrentHour, CurrentMinute);
        }

        private void OnHourPassed()
        {
            // Handle automatic opening and closing
            if (autoManageShopHours)
            {
                if (!IsShopOpen && CurrentHour == shopOpenHour)
                {
                    OpenShop();
                }
                else if (IsShopOpen && CurrentHour == shopCloseHour)
                {
                    CloseShop();
                }
            }

            // Roll for a random event each hour
            if (CurrentHour != lastEvaluatedHour)
            {
                lastEvaluatedHour = CurrentHour;
                RollForRandomEvent();
            }
        }

        private void OnDayPassed()
        {
            Debug.Log("[GameManager] A new day has started!");
            // Future logic: Reset daily stats, pay taxes, etc.
        }

        #endregion

        #region Shop Management

        public void OpenShop()
        {
            if (IsShopOpen) return;
            IsShopOpen = true;

            if (IsNightTime)
            {
                Debug.LogWarning("[GameManager] Shop opened outside of regular hours! High risk of robberies.");
            }
            else
            {
                Debug.Log("[GameManager] The shop is now OPEN.");
            }
            
            OnShopStateChanged?.Invoke(IsShopOpen);
        }

        [Header("Testing & Debug")]
        [Tooltip("Prefab of the CustomerNPC to spawn for testing.")]
        [SerializeField] private GameObject testNPCPrefab;
        [Tooltip("Where to spawn the test NPC. If left empty, will try to spawn at the ShopDoor.")]
        [SerializeField] private Transform testNPCSpawnPoint;

        public void SpawnTestNPC()
        {
            if (testNPCPrefab == null)
            {
                Debug.LogWarning("[GameManager] Test NPC Prefab is not assigned!");
                return;
            }

            Vector3 spawnPos = Vector3.zero;
            
            if (testNPCSpawnPoint != null)
            {
                spawnPos = testNPCSpawnPoint.position;
            }
            else if (ShopDoor.Instance != null)
            {
                spawnPos = ShopDoor.Instance.transform.position;
            }
            else
            {
                Debug.LogWarning("[GameManager] No spawn point or ShopDoor found. Spawning at 0,0,0.");
            }

            GameObject newNPC = Instantiate(testNPCPrefab, spawnPos, Quaternion.identity);
            Debug.Log($"[GameManager] Spawned test NPC: {newNPC.name}");
        }

        public void CloseShop()
        {
            if (!IsShopOpen) return;
            IsShopOpen = false;
            Debug.Log("[GameManager] The shop is now CLOSED.");

            // Force all NPCs to leave and put items back
            CustomerNPC[] allNPCs = FindObjectsByType<CustomerNPC>(FindObjectsInactive.Exclude, FindObjectsSortMode.None);
            foreach (var npc in allNPCs)
            {
                npc.KickOut();
            }

            OnShopStateChanged?.Invoke(IsShopOpen);
        }

        public void CustomerEntered()
        {
            CurrentCustomersInShop++;
            OnCustomerCountChanged?.Invoke(CurrentCustomersInShop);
        }

        public void CustomerLeft()
        {
            CurrentCustomersInShop = Mathf.Max(0, CurrentCustomersInShop - 1);
            OnCustomerCountChanged?.Invoke(CurrentCustomersInShop);
        }

        #endregion

        #region Economy Management

        public void AddMoney(int amount)
        {
            if (amount <= 0) return;
            CurrentMoney += amount;
            Debug.Log($"[GameManager] Earned {amount} coin(s). Balance: {CurrentMoney}");
            OnMoneyChanged?.Invoke(CurrentMoney);
        }

        public bool TrySpendMoney(int amount)
        {
            if (amount <= 0) return true;
            
            if (CurrentMoney >= amount)
            {
                CurrentMoney -= amount;
                Debug.Log($"[GameManager] Spent {amount} coin(s). Balance: {CurrentMoney}");
                OnMoneyChanged?.Invoke(CurrentMoney);
                return true;
            }

            Debug.LogWarning($"[GameManager] Not enough money! Needed: {amount}, Balance: {CurrentMoney}");
            return false;
        }

        #endregion

        #region Random Events

        private void RollForRandomEvent()
        {
            float currentEventChance = hourlyEventChance;

            // If shop is open at night, triple the chance of random events (robberies)
            if (IsShopOpen && IsNightTime)
            {
                currentEventChance *= 3f;
            }
            
            if (Random.Range(0f, 100f) <= currentEventChance)
            {
                TriggerRandomEvent();
            }
        }

        [ContextMenu("Force Trigger Random Event")]
        public void TriggerRandomEvent()
        {
            // Pick a random event that isn't 'None'
            int minEvent = 1; // skip None
            int maxEvent = Enum.GetValues(typeof(GameEvent)).Length;
            
            GameEvent triggeredEvent = (GameEvent)Random.Range(minEvent, maxEvent);
            
            Debug.Log($"<color=#FF5555><b>[GameManager] RANDOM EVENT TRIGGERED: {triggeredEvent}</b></color>");
            OnRandomEventTriggered?.Invoke(triggeredEvent);

            // Basic immediate effects
            switch (triggeredEvent)
            {
                case GameEvent.Plague:
                    Debug.Log(">> Plague strikes! Customers might avoid the shop today.");
                    break;
                case GameEvent.GoblinRobber:
                    Debug.Log(">> A Goblin Robber is trying to steal stock!");
                    break;
                case GameEvent.ShopRaid:
                    Debug.Log(">> A Shop Raid! Lock the doors!");
                    break;
                case GameEvent.MarketBoom:
                    Debug.Log(">> Market Boom! Selling prices are temporarily higher.");
                    break;
                case GameEvent.DeliveryArrived:
                    Debug.Log(">> An unexpected extra delivery arrived.");
                    break;
            }
        }

        #endregion
    }
}