using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;

/*
--------------------------------------
    Project: Programing assessment
    Standard: 91906 (AS3.7) v.1
    School: Tauranga Boys' College
    Author: Rauputu Noah Phizacklea
    Date: August 2024
    Unity: 2021.3.18f
---------------------------------------
*/

public class PlayerHealth : MonoBehaviour
{
    [SerializeField] private HitFlash flashEffect; // Reference to the hit flash effect
    public int maxHealth = 100; // Maximum health of the player
    public int currentHealth; // Current health of the player
    public Animator myAnimator; // Animator for player animations
    public HealthBar healthBar; // Reference to the health bar UI
    public GameManagerScript gameManager; // Reference to the game manager
    [SerializeField] private int healthPotionAmount = 3; // Number of health potions the player has
    public int healAmount = 20; // Amount of health restored by a potion
    private bool isDead; // Flag to check if the player is dead
    public TextMeshProUGUI potionAmountText; // UI text to display the number of health potions

    private Vector3 checkpointPos; // Player's checkpoint position
    private int initialHealthPotionAmount; // Initial number of health potions
    public float deathCounter = 0; // Counter for the number of deaths
    public TextMeshProUGUI deathText; // UI text to display the death count
    AudioManager audioManager; // Reference to the audio manager

    void Awake() 
    {
        // Initialize audio manager
        audioManager = GameObject.FindGameObjectWithTag("Audio").GetComponent<AudioManager>();
    }

    void Start()
    {
        // Initialize health and other variables
        myAnimator = GetComponent<Animator>();
        currentHealth = maxHealth;
        initialHealthPotionAmount = healthPotionAmount;
        checkpointPos = transform.position;
        healthBar.SetMaxHealth(maxHealth); // Set the maximum value for the health bar
        myAnimator.SetBool("isDead", false); // Ensure the player is not dead at the start
        UpdatePotionAmountUI(); // Update the potion amount display

        // Load the death count from PlayerPrefs
        if (PlayerPrefs.HasKey("DeathCount"))
        {
            deathCounter = PlayerPrefs.GetFloat("DeathCount");
        }

        // Display the death count
        deathText.text = "Death Count: " + deathCounter;
        UpdateDeathText(); // Initialize death count text
    }

    void Update()
    {
        // Use health potion when 'H' key is pressed
        if (Input.GetKeyDown(KeyCode.H))
        {
            StartCoroutine(HealthPotion());
        }
    }

    // Detect collision with hazards
    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.layer == LayerMask.NameToLayer("Hazards"))
        {
            TakeDamage(currentHealth); // Instantly kill the player
        }
    }

    // Method to handle taking damage
    public void TakeDamage(int damage)
    {
        currentHealth -= damage; // Decrease health by damage amount
        healthBar.SetHealth(currentHealth); // Update health bar

        // Check if the player is dead
        if (currentHealth <= 0 && !isDead)
        {
            audioManager.PlaySFX(audioManager.playerDeathSFX); // Play death sound
            isDead = true; // Set dead flag
            deathCounter++; // Increment death counter
            PlayerPrefs.SetFloat("DeathCount", deathCounter); // Save death count
            UpdateDeathText(); // Update death count display
            myAnimator.SetBool("isDead", true); // Trigger death animation
            gameManager.GameOver(); // Call game over method
        }
        else
        {
            flashEffect.Flash(); // Show hit flash effect
        }
    }

    // Coroutine to use a health potion
    private IEnumerator HealthPotion()
    {
        // Check if player is not dead and has potions
        if (!isDead && healthPotionAmount > 0)
        {
            flashEffect.Flash(); // Show hit flash effect
            audioManager.PlaySFX(audioManager.healPotionSFX);
            healthPotionAmount -= 1; // Decrease potion amount
            yield return new WaitForSeconds(1.5f); // Wait for potion effect duration
            currentHealth += healAmount; // Increase health by heal amount
            if (currentHealth > maxHealth)
            {
                currentHealth = maxHealth; // Cap health at maximum
            }

            healthBar.SetHealth(currentHealth); // Update health bar
            UpdatePotionAmountUI(); // Update potion amount display
        }
    }

    // Set a new checkpoint position and reset health
    public void SetNewCheckpoint(Vector3 newCheckpoint)
    {
        checkpointPos = newCheckpoint; // Update checkpoint position
        ResetHealth(); // Reset health and potions
    }

    // Reset health and potions to initial values
    public void ResetHealth()
    {
        currentHealth = maxHealth; // Reset health
        healthPotionAmount = initialHealthPotionAmount; // Reset potions
        healthBar.SetHealth(currentHealth); // Update health bar
        UpdatePotionAmountUI(); // Update potion amount display
    }

    // Update the UI text for potion amount
    private void UpdatePotionAmountUI()
    {
        potionAmountText.text = healthPotionAmount.ToString();
    }

    // Update the UI text for death count
    private void UpdateDeathText()
    {
        deathText.text = "Death Count: " + deathCounter;
    }
}