using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.Events;

public class Player : MonoBehaviour
{
    public static Player me;
    [Header("Components")]
    public GameObject unitPrefab;
    public Transform unitSpawnPos;
    public readonly int unitCost = 50;
    [Header("Resources")]
    public int wood;
    public int stone;
    public int food;
    [Header("Units")]
    public List<Unit> units = new List<Unit>();
    //events
    [System.Serializable]
    public class UnitCreatedEvent : UnityEvent<Unit> { }
    public UnitCreatedEvent onUnitCreated;
    public bool isMe;
    void Awake()
    {
        if(isMe)
            me = this;
    }
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        if(isMe)
        {
            GameUI.instance.UpdateUnitCountText(units.Count);
            //GameUI.instance.UpdateFoodText(food);
            GameUI.instance.UpdateResourceText(wood, ResourceType.Wood);
            GameUI.instance.UpdateResourceText(stone, ResourceType.Stone);
            GameUI.instance.UpdateResourceText(food, ResourceType.Food);
            CameraController.instance.FocusOnPosition(unitSpawnPos.position);
        }
        food += unitCost;
        CreateNewUnit();
    }

    // Update is called once per frame
    void Update()
    {
        if(Input.GetKeyDown(KeyCode.E))
            CreateNewUnit();
    }
    //is this my unit?
    public bool IsMyUnit(Unit unit)
    {
        return units.Contains(unit);
    }
    //called when a unit gathers a certain resource
    public void GainResouces(ResourceType type, int amount)
    {
        switch(type)
        {
            case ResourceType.Wood:
            {
                wood += amount;
                break;
            }
            case ResourceType.Stone:
            {
                stone += amount;
                break;
            }
            case ResourceType.Food:
            {
                food += amount;
                break;
            }
        }
        if(isMe)
        {
            GameUI.instance.UpdateResourceText(wood, ResourceType.Wood);
            GameUI.instance.UpdateResourceText(stone, ResourceType.Stone);
            GameUI.instance.UpdateResourceText(food, ResourceType.Food);
        }
    }
    public void CreateNewUnit()
    {
        if(food - unitCost < 0)
            return;
        GameObject unitObj = Instantiate(unitPrefab, unitSpawnPos.position, Quaternion.identity, transform);
        Unit unit = unitObj.GetComponent<Unit>();
        units.Add(unit);
        food -= unitCost;
        if(onUnitCreated != null)
            onUnitCreated.Invoke(unit);
        if(isMe)
        {
            GameUI.instance.UpdateUnitCountText(units.Count);
            GameUI.instance.UpdateResourceText(food, ResourceType.Food);
        }
    }
}