using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEditor.ShaderKeywordFilter;
using System.Linq;

public class GameController : MonoBehaviour
{
    /*
     * Slots to drag controllers into (e.g. UI)
     */
    [Header("Other Controllers")]
    public UIController UIDisplay;

    private Drill _selectedDrill;
    private List<Drill> _allDrills;

    [Header("Debugging Variables")]
    [SerializeField]
    private int _playerMoney = 0;
    [SerializeField]
    private int _rock;
    [SerializeField]
    private int _iron;
    [SerializeField]
    private int _silver;
    [SerializeField]
    private int _gold; 
    [SerializeField]
    private int _gem;

    public int GetDrillCount() {
        if(_allDrills == null) {
          // each time we ask for the drill count, we'll check the scene to see if the number of drills has changed
          _allDrills = GameObject.FindObjectsOfType<Drill>().ToList();
        } 
        return _allDrills.Count;
    }

    public int GetPlayerMoney() {
        return _playerMoney;
    }

    public int GetRock() {
        return _rock; 
    }

    public int GetIron() {
        return _iron;
    }

    //TODO: Add the missing accessor methods

    public void AddRock(int amount) {
        _rock += amount;
    }

    public void AddIron(int amount) {
        _iron += amount;
    }

    //TODO: Add the missing modifier methods



    // Method to handle button clicks
    public void OnUpgradeCoolingClicked() {
        _selectedDrill.AddCoolingUpgrade();
    }

    //TODO: Add the missing button handler method


    /**
     * THE CODE BELOW THIS SHOULDN'T NEED TO BE CHANGED
     * The code below will manage drill selection and deselection
     */

    private void Update() {
        if(Input.GetMouseButtonDown(0)) {
            HandleClick();
        }
    }

    private void HandleClick() {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        if(Physics.Raycast(ray, out RaycastHit hit)) {
            // Try to find a Drill on the hit object or its parents
            Drill drill = hit.collider.GetComponentInParent<Drill>();

            if(drill != null) {
                SetSelected(drill);
                return; // done
            }
        }

        // If we got here, we either hit nothing or hit a non-drill -> clear selection
        ClearSelected();
    }

    public void SetSelected(Drill drill) {
        if(_selectedDrill == drill)
            return; // already selected

        // Unhighlight previous drill
        if(_selectedDrill != null) {
            _selectedDrill.SetSelected(false);
        }

        // Set new selection
        _selectedDrill = drill;

        // Highlight new drill
        if(_selectedDrill != null) {
            _selectedDrill.SetSelected(true);
        }
        
        //TODO: Uncomment this line once you have the UI working
        //UIDisplay.UpdateUI();
    }

    public Drill GetSelectedDrill() {
        return _selectedDrill; 
    }

    public void ClearSelected() {
        SetSelected(null);
    }
}