class_name NPC
extends Node2D


enum npcDifficulties { MINION, NORMAL, ELITE, BOSS, ELITEBOSS, BBEG }
enum npcTiers { I, II, III, IV, V, VI, VII, VIII, IX, X }

signal npc_died(npcTier: npcTiers)

@export var charName := "Character"
@export var maxHealth := 10
@export var damageTaken := 0
@export var npcDifficulty: npcDifficulties
@export var npcTier: npcTiers

func _random_mod_health() -> void:
    randomize()
    # noise factor
    var noise_factor = randf_range(7, 10)
    self.maxHealth *= noise_factor
    # difficulty factor
    match self.npcDifficulty:
        npcDifficulties.MINION:
            self.maxHealth /= 2
        npcDifficulties.ELITE:
            self.maxHealth *= 2
        npcDifficulties.BOSS:
            self.maxHealth *= 4
        npcDifficulties.ELITEBOSS:
            self.maxHealth *= 8
        npcDifficulties.BBEG:
            self.maxHealth *= 16
    # npcTier factor
    self.maxHealth *= exp(self.npcTier)
    # fun factor (just additional factor to tweak)
    self.maxHealth *= 10


func _init() -> void:
    self.npcDifficulty = npcDifficulties.NORMAL
    self.npcTier = npcTiers.I
 

func _ready() -> void:
    # modify max health value based on the various factors
    _random_mod_health()
    
    # set health bar
    %Healthbar.max_value = maxHealth
    %Healthbar.value = maxHealth
    
func _process(_delta: float) -> void:
    %Healthbar.value = maxHealth - damageTaken
    if damageTaken >= maxHealth:
        # send signal that I died to be counted, gen loot, etc.
        npc_died.emit(self.npcTier)
        # delete node
        self.free()