extends Node3D

# Tekton - Roaming NPC
# Moves around the grid and spawns tiles when attacked.

signal movement_finished

@export var current_position: Vector2i = Vector2i(0, 0)
@export var health: int = 3
@export var movement_speed: float = 0.4 # Seconds per step

var enhanced_gridmap: Node
var is_moving: bool = false
var is_carried: bool = false
var carrier: Node3D = null
var tween: Tween

const SIDE_OFFSET = 0.35 # Distance from center

func initialize(start_pos: Vector2i, p_gridmap: Node):
	current_position = start_pos
	enhanced_gridmap = p_gridmap
	
	# Grounded and Side-positioned
	# We use a consistent side offset (e.g. North-West corner of the tile)
	update_visual_position()

@rpc("any_peer", "call_local", "reliable")
func sync_position(pos: Vector2i):
	current_position = pos
	update_visual_position()

func update_visual_position():
	if is_carried: return
	
	# Align with floor height (matching player's typical grounded height)
	var floor_y = 0.05
	if enhanced_gridmap and "cell_size" in enhanced_gridmap:
		floor_y = enhanced_gridmap.cell_size.y
		
	# Side offset: place it near the edge
	# Using NW corner (+0.2, +0.2) instead of center (+0.5, +0.5)
	position = Vector3(current_position.x + 0.2, floor_y, current_position.y + 0.2)

func move_to(target_pos: Vector2i):
	if is_moving or is_carried: return
	
	# Validate
	if not enhanced_gridmap.is_position_valid(target_pos):
		return
		
	is_moving = true
	
	var floor_y = 0.05
	if enhanced_gridmap and "cell_size" in enhanced_gridmap:
		floor_y = enhanced_gridmap.cell_size.y
		
	var target_world_pos = Vector3(target_pos.x + 0.2, floor_y, target_pos.y + 0.2)
	
	# Rotation
	var dir = target_world_pos - position
	if dir.length_squared() > 0.01:
		var target_rot = atan2(dir.x, dir.z)
		rotation.y = target_rot
	
	tween = create_tween()
	tween.tween_property(self , "position", target_world_pos, movement_speed).set_trans(Tween.TRANS_SINE).set_ease(Tween.EASE_IN_OUT)
	tween.tween_callback(func():
		current_position = target_pos
		is_moving = false
		emit_signal("movement_finished")
	)
	
	if is_multiplayer_authority():
		rpc("sync_movement", target_pos)

@rpc("any_peer", "call_remote", "reliable")
func sync_movement(target_pos: Vector2i):
	# Clients execute the move visually
	move_to(target_pos)

# --- COMBAT / INTERACTION ---

func on_hit(attacker: Node = null, intensity: float = 1.0):
	"""Called when hit by a player attack or knock. 
	Intensity: 0.5 for throw, 1.0+ for knock."""
	print("[Tekton] Hit by %s! Intensity: %.1f" % [attacker.name if attacker else "Unknown", intensity])
	
	# Visual Reaction (Flash red)
	_flash_damage()
	
	# Spawn Tiles
	if is_multiplayer_authority():
		var tile_count = int(8 * intensity) # Base 8 tiles for 1.0 intensity
		spawn_tiles_around(tile_count)

@rpc("any_peer", "call_local")
func set_carried(state: bool, p_carrier: Node3D = null):
	is_carried = state
	carrier = p_carrier
	is_moving = false
	if tween: tween.kill()
	
	# Disable/Enable controller
	var controller = get_node_or_null("TektonController")
	if controller:
		controller.set_physics_process(not state)
		if state:
			controller.get_node("Timer").stop()
		else:
			controller.call("_start_timer")
	
	if not state:
		update_visual_position()

func _process(delta):
	if is_carried and is_instance_valid(carrier):
		# Carry on head: offset Y by approx carrier height (e.g. 1.25)
		global_position = carrier.global_position + Vector3(0, 1.5, 0)
		rotation = carrier.rotation

func _flash_damage():
	var meshes = find_children("*", "MeshInstance3D", true)
	for mesh in meshes:
		var original_modulate = mesh.transparency
		# Quick flash hack or shader param? 
		# If standard material, maybe just modulate visibility or scale
		var t = create_tween()
		t.tween_property(mesh, "scale", Vector3(1.2, 1.2, 1.2), 0.1)
		t.tween_property(mesh, "scale", Vector3(1.0, 1.0, 1.0), 0.1)

func spawn_tiles_around(count: int = 4):
	"""Spawns a mix of normal and special tiles in a radius."""
	if not enhanced_gridmap: return
	
	var radius = 2
	var rng = RandomNumberGenerator.new()
	rng.randomize()
	
	print("[Tekton] Spawning %d tiles around %s" % [count, current_position])
	
	var spawned = 0
	var attempts = 0
	while spawned < count and attempts < 25:
		attempts += 1
		var x = rng.randi_range(-radius, radius)
		var y = rng.randi_range(-radius, radius)
		
		var pos = current_position + Vector2i(x, y)
		
		# Don't overwrite the Tekton's own cell? Or do? 
		# Maybe avoid center.
		if x == 0 and y == 0: continue
		
		if enhanced_gridmap.is_position_valid(pos):
			# 50% chance to spawn something
			if rng.randf() > 0.5: continue
			
			# Determine Type
			var item_id: int
			var roll = rng.randf()
			
			if roll < 0.6:
				# 60% Normal Tile (7-10)
				item_id = rng.randi_range(7, 10)
			elif roll < 0.9:
				# 30% PowerUp (11-14)
				item_id = rng.randi_range(11, 14)
			else:
				# 10% Obstacle/Trap (optional)
				item_id = -1 # Clear?
				
			if item_id != -1:
				var main = get_tree().get_root().get_node_or_null("Main")
				if main:
					main.rpc("sync_grid_item", pos.x, 1, pos.y, item_id)
					spawned += 1