using System.Collections.Generic;
using UnityEngine;

public class HousingManager : MonoBehaviour
{
    [Header("Housing Settings")]
    public int villagersPerHouse = 2;
    public float warningCheckInterval = 5f;

    private List<Building> houses = new List<Building>();
    private float lastWarningCheck = 0f;
    private bool hasShownWarning = false;

    // Events
    public static System.Action<int, int> OnHousingStatusChanged; // (housed villagers, total villagers)
    public static System.Action<string> OnHousingWarning;

    void Start()
    {
        // Subscribe to building placement events
        BuildingSystem.OnBuildingPlaced += OnBuildingPlaced;

        // Initial check
        UpdateHousingStatus();
    }

    void Update()
    {
        // Check housing status periodically
        if (Time.time - lastWarningCheck > warningCheckInterval)
        {
            CheckHousingWarnings();
            lastWarningCheck = Time.time;
        }
    }

    void OnDestroy()
    {
        BuildingSystem.OnBuildingPlaced -= OnBuildingPlaced;
    }

    void OnBuildingPlaced(GameObject building)
    {
        Building buildingComponent = building.GetComponent<Building>();
        if (buildingComponent != null && buildingComponent.buildingName == "House")
        {
            houses.Add(buildingComponent);
            UpdateHousingStatus();
            Debug.Log($"New house added. Total houses: {houses.Count}");
        }
    }

    void CheckHousingWarnings()
    {
        int totalVillagers = GetTotalVillagerCount();
        int maxHousedVillagers = GetMaxHousedVillagers();

        if (totalVillagers > maxHousedVillagers)
        {
            int homelessCount = totalVillagers - maxHousedVillagers;
            string warningMessage = $"Warning: {homelessCount} villager{(homelessCount > 1 ? "s" : "")} without housing!";

            if (!hasShownWarning || homelessCount > 0)
            {
                OnHousingWarning?.Invoke(warningMessage);
                Debug.LogWarning(warningMessage);
                hasShownWarning = true;
            }
        }
        else
        {
            hasShownWarning = false;
        }

        UpdateHousingStatus();
    }

    void UpdateHousingStatus()
    {
        int totalVillagers = GetTotalVillagerCount();
        int maxHousedVillagers = GetMaxHousedVillagers();

        OnHousingStatusChanged?.Invoke(maxHousedVillagers, totalVillagers);
    }

    int GetTotalVillagerCount()
    {
        if (GameManager.Instance?.villagerManager == null)
            return 0;

        return GameManager.Instance.villagerManager.GetAllVillagers().Count;
    }

    int GetMaxHousedVillagers()
    {
        // Remove null/destroyed houses
        houses.RemoveAll(house => house == null);

        return houses.Count * villagersPerHouse;
    }

    public bool HasAvailableHousing()
    {
        int totalVillagers = GetTotalVillagerCount();
        int maxHousedVillagers = GetMaxHousedVillagers();

        return maxHousedVillagers >= totalVillagers;
    }

    public int GetAvailableHousingSlots()
    {
        int totalVillagers = GetTotalVillagerCount();
        int maxHousedVillagers = GetMaxHousedVillagers();

        return Mathf.Max(0, maxHousedVillagers - totalVillagers);
    }

    public string GetHousingStatusText()
    {
        int totalVillagers = GetTotalVillagerCount();
        int maxHousedVillagers = GetMaxHousedVillagers();

        return $"Housing: {Mathf.Min(totalVillagers, maxHousedVillagers)}/{totalVillagers} villagers housed ({houses.Count} houses)";
    }
}