extends "res://scripts/enemy_base.gd"

# Rat Enemy - Moves in 4 directions, chases players

enum RatState { IDLE, WANDERING }
var state: RatState = RatState.IDLE
var state_timer: float = 0.0

var idle_duration: float = 3.0  # Longer idle time
var wander_duration: float = 2.0  # Short wander time
var detection_range: float = 150.0

func _ready():
	super._ready()
	
	max_health = 15.0  # Reduced from 25.0 for better balance
	current_health = max_health
	move_speed = 40.0  # Much slower
	damage = 8.0
	exp_reward = 5.0  # Rats give low EXP
	
	state_timer = idle_duration
	
	# CRITICAL: Ensure collision mask is set correctly (walls are on layer 7 = bit 6 = 64)
	collision_mask = 1 | 2 | 64  # Collide with players (layer 1), objects (layer 2), and walls (layer 7 = bit 6 = 64)

# Override to set weak stats for rats
func _initialize_character_stats():
	super._initialize_character_stats()
	# Rats are weak enemies - very low END for low DEF
	character_stats.baseStats.end = 5  # END=5 gives DEF=1.0 (5 * 0.2)
	character_stats.baseStats.str = 7  # Low STR = low damage
	character_stats.baseStats.dex = 8  # Slightly higher DEX (rats are fast)
	character_stats.baseStats.int = 5
	character_stats.baseStats.wis = 5
	character_stats.baseStats.lck = 5
	# Re-initialize hp and mp with new stats
	character_stats.hp = character_stats.maxhp
	character_stats.mp = character_stats.maxmp
	# Sync max_health from character_stats
	max_health = character_stats.maxhp
	current_health = max_health

func _ai_behavior(delta):
	# Update state timer
	state_timer -= delta
	
	# Find nearest player
	target_player = _find_nearest_player()
	
	# State machine
	match state:
		RatState.IDLE:
			_idle_behavior(delta)
		RatState.WANDERING:
			_wandering_behavior(delta)
	
	# Update animation
	_update_animation(delta)

func _idle_behavior(_delta):
	velocity = Vector2.ZERO
	
	# Show idle frame
	anim_frame = 2
	
	# Switch to wandering after idle duration (don't chase players)
	if state_timer <= 0:
		state = RatState.WANDERING
		state_timer = wander_duration

func _wandering_behavior(_delta):
	# Pick a random direction at the start of wandering
	if state_timer >= wander_duration - 0.1:  # Only change direction at start
		var dirs = [Vector2.UP, Vector2.DOWN, Vector2.LEFT, Vector2.RIGHT]
		var random_dir = dirs[randi() % dirs.size()]
		velocity = random_dir * move_speed
		current_direction = _get_direction_from_vector(random_dir)
	
	# Keep moving in the same direction during wander
	# (velocity is already set, just maintain it)
	
	# Switch back to idle after wander duration
	if state_timer <= 0:
		state = RatState.IDLE
		state_timer = idle_duration
		velocity = Vector2.ZERO  # Stop moving

func _snap_to_4_directions(dir: Vector2) -> Vector2:
	# Snap to closest cardinal direction
	if abs(dir.x) > abs(dir.y):
		return Vector2(sign(dir.x), 0)
	else:
		return Vector2(0, sign(dir.y))

func _update_animation(delta):
	if state == RatState.IDLE or velocity.length() < 1.0:
		# Show idle frame
		anim_frame = 2
	else:
		# Animate moving (frames 0, 1, 2)
		anim_time += delta
		if anim_time >= anim_speed:
			anim_time = 0.0
			anim_frame = (anim_frame + 1) % 3
	
	# Map directions to 4 sprite directions (only use cardinal directions)
	var sprite_dir = _get_sprite_direction_4()
	
	# Set sprite frame
	if sprite:
		sprite.frame = anim_frame + (sprite_dir * 3)

func _get_sprite_direction_4() -> int:
	# Only use 4 cardinal directions
	match current_direction:
		Direction.DOWN, Direction.DOWN_LEFT, Direction.DOWN_RIGHT:
			return 0  # Down
		Direction.LEFT, Direction.UP_LEFT:
			return 1  # Left
		Direction.RIGHT, Direction.UP_RIGHT:
			return 2  # Right
		Direction.UP:
			return 3  # Up
	return 0

func _update_client_visuals():
	# Update visuals on clients based on synced state
	super._update_client_visuals()
	
	# Update sprite frame based on synced anim_frame and direction
	if sprite:
		var sprite_dir = _get_sprite_direction_4()
		sprite.frame = anim_frame + (sprite_dir * 3)  # 3 frames per direction

func _die():
	if is_dead:
		return
	
	# Remove collision layer so they don't collide with players, but still collide with walls
	set_collision_layer_value(2, false)  # Remove from enemy collision layer (layer 2)
	
	# Call parent _die() which handles death sync and _play_death_animation()
	super._die()

func _play_death_animation():
	# Simple fade out
	var fade_tween = create_tween()
	fade_tween.tween_property(sprite, "modulate:a", 0.0, 0.4)
	
	await fade_tween.finished
	queue_free()