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

namespace MedievalShopkeeper
{
    public class NPCManager : MonoBehaviour
    {
        [Header("Prefabs")]
        [Tooltip("List of visually different NPC prefabs to spawn.")]
        public List<GameObject> npcPrefabs;
        
        [Tooltip("Where the NPCs spawn when they arrive.")]
        public Transform spawnPoint;

        [Header("Spawning Settings")]
        [Tooltip("Base minimum time between spawns when shop is open.")]
        public float minSpawnDelay = 10f;
        [Tooltip("Base maximum time between spawns when shop is open.")]
        public float maxSpawnDelay = 25f;

        [Header("Demand & Items")]
        [Tooltip("List of all items currently available in the game that NPCs might want to buy.")]
        public List<ItemData> allAvailableItems;

        private float spawnTimer;

        private void Start()
        {
            ResetSpawnTimer();
        }

        private void Update()
        {
            if (GameManager.Instance == null || !GameManager.Instance.IsShopOpen) return;

            spawnTimer -= Time.deltaTime;

            if (spawnTimer <= 0)
            {
                SpawnNPC();
                ResetSpawnTimer();
            }
        }

        private void ResetSpawnTimer()
        {
            float delay = Random.Range(minSpawnDelay, maxSpawnDelay);
            
            if (GameManager.Instance != null && GameManager.Instance.IsNightTime)
            {
                // Night time has fewer customers, so multiply the wait time
                delay *= 2.5f;
            }

            spawnTimer = delay;
        }

        private void SpawnNPC()
        {
            if (npcPrefabs == null || npcPrefabs.Count == 0)
            {
                Debug.LogWarning("[NPCManager] No NPC Prefabs assigned!");
                return;
            }

            Vector3 spawnPos = spawnPoint != null ? spawnPoint.position : (ShopDoor.Instance != null ? ShopDoor.Instance.transform.position : Vector3.zero);

            GameObject prefabToSpawn = npcPrefabs[Random.Range(0, npcPrefabs.Count)];
            GameObject spawnedObj = Instantiate(prefabToSpawn, spawnPos, Quaternion.identity);
            
            CustomerNPC npc = spawnedObj.GetComponent<CustomerNPC>();
            if (npc != null)
            {
                NPCIntention intent = RollForIntention();
                List<ItemData> shoppingList = GenerateShoppingList(intent);
                
                npc.Initialize(intent, shoppingList);
                Debug.Log($"[NPCManager] Spawned {npc.npcName} with intention: {intent}.");
            }
        }

        private NPCIntention RollForIntention()
        {
            float shoplifterChance = 5f;
            float raiderChance = 2f;

            if (GameManager.Instance != null && GameManager.Instance.IsNightTime)
            {
                // Massive risk increase at night
                shoplifterChance = 20f;
                raiderChance = 10f;
            }

            float roll = Random.Range(0f, 100f);

            if (roll < raiderChance) return NPCIntention.Raider;
            if (roll < raiderChance + shoplifterChance) return NPCIntention.Shoplifter;

            return NPCIntention.Shopper;
        }

        private List<ItemData> GenerateShoppingList(NPCIntention intent)
        {
            List<ItemData> list = new List<ItemData>();
            
            // Raiders don't care about shopping lists
            if (intent == NPCIntention.Raider) return list;

            if (allAvailableItems == null || allAvailableItems.Count == 0) return list;

            int itemsWanted = Random.Range(1, 4);
            for (int i = 0; i < itemsWanted; i++)
            {
                ItemData randomItem = allAvailableItems[Random.Range(0, allAvailableItems.Count)];
                list.Add(randomItem);
            }

            return list;
        }
    }
}