using UnityEngine;

/// <summary>
/// Core player stats: health and stamina.
/// Stamina drains while sprinting, regens when not.
/// If stamina hits zero the player is exhausted and can't sprint again until it fully refills.
/// </summary>
public class Player : MonoBehaviour
{
    [Header("Health")]
    public float maxHealth   = 100f;
    public float health      = 100f;

    [Header("Stamina")]
    public float maxStamina       = 100f;
    public float stamina          = 100f;
    public float staminaDrain     = 22f;   // per second while sprinting
    public float staminaRegen     = 12f;   // per second while not sprinting
    public float regenDelay       = 1.2f;  // seconds after stopping sprint before regen kicks in

    // ─── State ───────────────────────────────────────────────────────
    [HideInInspector] public bool isSprinting   = false;
    [HideInInspector] public bool isExhausted   = false;  // true until stamina fully refills

    private float _regenTimer = 0f;

    // ─────────────────────────────────────────────────────────────────
    void Update()
    {
        if (isSprinting && !isExhausted)
        {
            stamina -= staminaDrain * Time.deltaTime;
            _regenTimer = 0f;

            if (stamina <= 0f)
            {
                stamina    = 0f;
                isExhausted = true;
            }
        }
        else
        {
            // Count down regen delay
            _regenTimer += Time.deltaTime;

            if (_regenTimer >= regenDelay)
            {
                stamina = Mathf.MoveTowards(stamina, maxStamina, staminaRegen * Time.deltaTime);

                // Clear exhaustion only once fully refilled
                if (isExhausted && stamina >= maxStamina)
                    isExhausted = false;
            }
        }

        health  = Mathf.Clamp(health,  0f, maxHealth);
        stamina = Mathf.Clamp(stamina, 0f, maxStamina);
    }

    // ─── Helpers other scripts can call ──────────────────────────────
    public bool CanSprint() => !isExhausted && stamina > 0f;

    public float HealthFraction   => health  / maxHealth;
    public float StaminaFraction  => stamina / maxStamina;
}