using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Assets.FantasyMonsters.Scripts;
using System.Runtime.CompilerServices;
using Assets.Scripts.CharacterScripts;
using UnityEngine.EventSystems;
using System;
using UnityEngine.Analytics;
using Unity.VisualScripting;
using UnityEngine.SceneManagement;

public class EnemyController : MonoBehaviour{
    private Monster Monster; // A reference to the Monster script; this enemy's animations
    public int health; // Enemy health
    public float moveSpeed = 5f, chaseMultiplier = 1.5f;  // How fast the player moves left and right and the chase multiplier to the speed
    public float jumpForce = 25f; // How fast/far the player jumps in the air
    Rigidbody2D rb; // The enemy's rigidbody
    public int damage = 10; // The enemy's damage
    public int experience = 10; // The enemy's experience (that it gives upon death)
    public bool isDead = false; // Boolean to see if the enemy died
    public float patrolOffset; // The offset for moving left and right
    public Vector3 beginningPosition; // Enemy start position
    private Vector2 leftTarget, rightTarget, currentTarget; // The waypoints to patrol
    private bool leftReached = false, rightReached = true; // See if we reached the left/right waypoint; just initializing them as opposites
    public Vector3 faceRight, faceLeft; // Vector for the sprite facing right and left; set it per enemy
    public Transform player; // Reference to the player
    Vector2 chaseDirection; // The direction the enemy will chase the player
    public float detectionRange; // Range that the enemy detects the player within
    private bool isChasing = false; // Boolean to see if the enemy is chasing the player or not
    public bool ableToJump = false; // Undecided if I want certain enemies to jump or not yet
    public float attackRange; // Attack range for the enemy, set per enemy
    public BossHealthBar bossHealthBar; // Reference to the boss health bar if this enemy is the boss
    public AudioSource enemySound; // The sound effect for this enemy


    // Start is called before the first frame update
    void Start(){
        // If the boss health bar is not null, set the health
        if (bossHealthBar != null){
            bossHealthBar.SetBossMaxHealth(health);
        }
        // Get the monster's components for animations
        Monster = GetComponent<Monster>();
        // Set the monster's state to ready
        Monster.SetState(MonsterState.Ready);

        rb = GetComponent<Rigidbody2D>();
        // This locks the Z-axis, prevents the player sprite from falling over unintentionally due to physics
        rb.constraints = RigidbodyConstraints2D.FreezeRotation;

        // Save the starting position for the enemy and initialize the reference to the player's transform
        beginningPosition = transform.position;
        player = GameObject.FindGameObjectWithTag("Player").transform;  
    }

    // Update is called once per frame
    void Update(){
        // Calculate the distance to the player, and see if the player is within the detection range
        float distToPlayer = Math.Abs(Vector2.Distance(transform.position, player.position));
        if (distToPlayer <= detectionRange){
            // Set isChasing to true
            isChasing = true;
            // If so, begin to chase
            Chase(distToPlayer);
        } else if (distToPlayer > detectionRange){
            if (isChasing){
                // This allows the enemy to move back to its patrol zone after a chase
                isChasing = false;
                rightReached = true;
                transform.position = Vector2.MoveTowards(transform.position, leftTarget, moveSpeed * Time.deltaTime);
            }
            // Patrol the corresponding zone
            Patrol();
        } 

    }

    void Patrol(){
        Monster.SetState(MonsterState.Walk);
        // Set the waypoints on the left and the right to patrol
        leftTarget = new Vector2(beginningPosition.x - patrolOffset, beginningPosition.y);
        rightTarget = new Vector2(beginningPosition.x + patrolOffset, beginningPosition.y);
        Vector2 moveDirection = new Vector2();

        // If we reached the right, move towards the left
        if (rightReached){
            moveDirection = (leftTarget - rb.position).normalized;
            currentTarget = leftTarget;
            transform.position = Vector2.MoveTowards(transform.position, leftTarget, moveSpeed * Time.deltaTime);
        } else if (leftReached){
            // If we reached the left, move towards the right
            moveDirection = (rightTarget - rb.position).normalized;
            currentTarget = rightTarget;
            transform.position = Vector2.MoveTowards(transform.position, rightTarget, moveSpeed * Time.deltaTime);
        }

        // If we move right, face right; if we move left, face left
        if (moveDirection.x > 0f){
            transform.localScale = faceRight;
        } else if (moveDirection.x < 0f){
            transform.localScale = faceLeft;
        }

        // If we're within 1f from our position to the waypoint we are seeing
        if (Vector2.Distance(transform.position, currentTarget) < 1f){
            // If we previously reached the right, now we reached the left
            if (rightReached){
                rightReached = false;
                leftReached = true;
                // Same but the opposite logic
            } else if (leftReached){
                leftReached = false;
                rightReached = true;
            }
        }
    }

    void Chase(float distToPlayer){
        Monster.SetState(MonsterState.Run);
        // Calculate the direction the enemy is chasing
        chaseDirection = (player.position - transform.position).normalized;
        
        rb.velocity = chaseDirection * moveSpeed;

        // Take into account the way the sprite is facing
        if (chaseDirection.x > 0f){
            transform.localScale = faceRight;
        } else if (chaseDirection.x < 0f){
            transform.localScale = faceLeft;
        }

        // Chase the player at a speed meant to be faster than the parol speed
        transform.position = Vector2.MoveTowards(transform.position, new Vector2(player.position.x, beginningPosition.y), moveSpeed * 1.5f * Time.deltaTime);
        leftReached = false;
        rightReached = false;

        // If we're within range of the player, play attack animation
        if (distToPlayer <= attackRange){
            Monster.Attack();
        }

    }

    // Apply damage to the enemy
    public void TakeDamage(int damage){
        health -= damage;
        // If the health drops to/below 0, destroy the enemy and mark isDead
        if (health <= 0){
            // If this is the boss that is dying, do the same process but load the you win scene
            if (bossHealthBar != null){
                isDead = true;
                player.GetComponent<PlayerController>().GainExp(experience);
                Destroy(gameObject);
                SceneManager.LoadScene("YouWin");
            }
            isDead = true;
            player.GetComponent<PlayerController>().GainExp(experience);
            Destroy(gameObject);
        }

        // If the boss is taking damage, adjust the health bar as needed
        if (bossHealthBar != null){
            bossHealthBar.SetBossHealth(health);
        }
    }

    void OnCollisionEnter2D(Collision2D other){
        // If the enemy collides with the player's weapon, then take the corresponding player's damage
        if (other.gameObject.CompareTag("PlayerWeapon")){
            WeaponController playerWeapon = other.gameObject.GetComponent<WeaponController>();
            if (playerWeapon.playerAttacks){
                // Play this enemy's sound effect if hit
                enemySound.Play();
                TakeDamage(playerWeapon.damage);
            }
        } else if (other.gameObject.CompareTag("Enemy")){
            // Ignore collisions with other enemies
            Physics2D.IgnoreCollision(GetComponent<Collider2D>(), other.collider, true);
        } else if (other.gameObject.CompareTag("EnemyWeapon")){
            // Ignore the enemy weapon if it exists
            Physics2D.IgnoreCollision(GetComponent<Collider2D>(), other.collider, true);
        }
    }
}