extends Node2D

@onready var world_renderer = $World
@onready var fog_entities = $World/FogEntities  # D-059/D-060: cognitive delay fog visualization
@onready var camera = $Camera2D
@onready var hud = $UILayer/HUD
@onready var monologue_display = $UILayer/MonologueDisplay
@onready var interaction_prompt = $InsertOverlay/InteractionPrompt  # v0.1 single-line fallback
@onready var interaction_list = $InsertOverlay/InteractionList  # D-057: z-layer 6
@onready var world_radial = $InsertOverlay/WorldRadial  # D-058: z-layer 6
@onready var dialogue_box = $InsertOverlay/DialogueBox  # D-061: z-layer 6
@onready var inventory_grid = $UILayer/InventoryGrid  # D-065: z-layer 7
@onready var stance_indicator = $UILayer/StanceIndicator  # D-053: z-layer 7
@onready var cursor_renderer = $UILayer/CursorRenderer  # D-056: z-layer 7

# Tracks the dialogue_id from dialogue_box to prevent consume-once race during fade-in.
# If a new snapshot arrives with null dialogue while fade-in is still running,
# we don't re-trigger show_dialogue because _last_dialogue_id still matches.
var _last_dialogue_id: int = 0
var _camera_anchored: bool = false
var _last_monologue_tick: int = -1  # Prevent re-consuming monologue when same tick polled twice
var _last_dialogue_tick: int = -1

func _ready() -> void:
	print("The Settled Reach — client initialized")

	# Disable camera smoothing during init. Camera2D's position_smoothing
	# lerps an internal smoothed_camera_pos toward global_position each frame.
	# That smoothed position initializes at (0,0) — the Camera2D's default in
	# the .tscn. Even after we set global_position to the player coords,
	# smoothing causes the viewport to still show (0,0) on the first rendered
	# frame because the lerp hasn't converged. With smoothing OFF, the viewport
	# uses global_position directly. Re-enabled in _process() after anchor.
	camera.position_smoothing_enabled = false

	# Connect to simulation (test mode sets CONNECTED immediately)
	SimBridge.connect_to_sim()

	# Camera anchor: snap to player position before the first frame renders.
	# In test mode poll_snapshot() returns synchronously — position is set
	# immediately. In live mode the snapshot isn't available yet — _process
	# handles it. No reset_smoothing() needed: smoothing is OFF.
	var first_snapshot: Variant = SimBridge.poll_snapshot()
	if first_snapshot != null:
		GameState.apply_snapshot(first_snapshot)
		camera.global_position = GameState.player_position * Constants.TILE_SIZE
		_camera_anchored = true

	# D-061: Connect dialogue box signals
	if dialogue_box:
		dialogue_box.option_selected.connect(_on_dialogue_option_selected)
		dialogue_box.dialogue_dismissed.connect(_on_dialogue_dismissed)


func _process(_delta: float) -> void:
	# Main game loop: poll snapshot, apply state, flush input
	var snapshot: Variant = SimBridge.poll_snapshot()
	if snapshot != null:
		GameState.apply_snapshot(snapshot)

		# Late anchor: live mode — first snapshot arrives during _process.
		# Smoothing is already OFF (disabled in _ready), so setting
		# global_position takes effect immediately with no lerp.
		if not _camera_anchored:
			camera.global_position = GameState.player_position * Constants.TILE_SIZE
			_camera_anchored = true

		# Update renderers with new state
		if world_renderer and world_renderer.has_method("update_from_state"):
			world_renderer.update_from_state()

		# D-057: Update interaction list from game state
		if interaction_list and interaction_list.has_method("update_from_state"):
			interaction_list.update_from_state()

		# D-065: Update inventory grid
		if inventory_grid and inventory_grid.has_method("update_from_state"):
			inventory_grid.update_from_state()

		# D-053: Update stance indicator
		if stance_indicator and stance_indicator.has_method("update_from_state"):
			stance_indicator.update_from_state()

		# D-059/D-060: Update fog entity visualization (#431)
		if fog_entities and fog_entities.has_method("update_from_state"):
			fog_entities.update_from_state()

		# Show monologue if server sent one this tick (#414)
		_consume_monologue()

		# D-061: Show dialogue if server sent one this tick (#434)
		_consume_dialogue()

	# Track camera to player position every frame (D-015: locked, no panning)
	if _camera_anchored:
		camera.global_position = GameState.player_position * Constants.TILE_SIZE

	# Re-enable smoothing after the first anchored frame. The frame that just
	# rendered used smoothing=OFF (correct viewport from frame one). Now we
	# turn smoothing back on and sync its internal state so subsequent frames
	# get smooth camera tracking during gameplay.
	if _camera_anchored and not camera.position_smoothing_enabled:
		camera.position_smoothing_enabled = true
		camera.reset_smoothing()

	# Send queued input to simulation
	var inputs = InputMapper.flush_queue()
	for input in inputs:
		if input.action == InputMapper.Action.INTERACT:
			# D-057: prefer interaction list (multi-verb), fall back to prompt (v0.1)
			var target_id: int = -1
			var verb: String = ""
			if interaction_list and interaction_list.has_method("get_interaction_target"):
				target_id = interaction_list.get_interaction_target()
				verb = interaction_list.get_selected_verb()
			if target_id < 0 and interaction_prompt:
				target_id = interaction_prompt.get_interaction_target()
				verb = interaction_prompt.get_selected_verb()
			# Always send struct form for Interact (#415) — server expects named fields
			if target_id >= 0:
				input["action_data"] = {
					"target_entity_id": target_id,
					"verb": verb,
				}
			else:
				input["action_data"] = {
					"target_entity_id": null,
					"verb": null,
				}
		SimBridge.send_input(input)


# Consume-once per tick: show monologue text, then clear.
# Tick guard prevents re-triggering when the same tick is polled multiple
# times (client FPS > sim tick rate).
func _consume_monologue() -> void:
	if GameState.current_monologue == null or not monologue_display:
		return
	if GameState.current_tick == _last_monologue_tick:
		return
	_last_monologue_tick = GameState.current_tick
	var mono: Dictionary = GameState.current_monologue
	monologue_display.show_monologue(mono.get("text", ""), mono.get("duration_seconds", 5.0))
	GameState.current_monologue = null


# Consume-once per tick with ID tracking: show dialogue, then clear.
# Tick guard + is_dialogue_active check prevent re-triggering.
func _consume_dialogue() -> void:
	if GameState.current_dialogue == null or not dialogue_box:
		return
	if GameState.current_tick == _last_dialogue_tick:
		return
	if dialogue_box.is_dialogue_active():
		GameState.current_dialogue = null
		return
	_last_dialogue_tick = GameState.current_tick
	var dlg: Dictionary = GameState.current_dialogue
	dialogue_box.show_dialogue(
		dlg.get("npc_name", ""),
		dlg.get("speech", ""),
		dlg.get("options", [])
	)
	_last_dialogue_id = dialogue_box.get_dialogue_id()
	GameState.current_dialogue = null


# D-061: Handle dialogue option selection → send to server
func _on_dialogue_option_selected(index: int, text: String) -> void:
	SimBridge.send_input({
		"action": InputMapper.Action.INTERACT,
		"timestamp_msec": Time.get_ticks_msec(),
		"action_data": {
			"target_entity_id": null,
			"verb": "DialogueResponse",
			"dialogue_option_index": index,
			"dialogue_option_text": text,
		},
	})


# D-064: Handle walk-away → send DialogueEnd to server
func _on_dialogue_dismissed() -> void:
	SimBridge.send_input({
		"action": InputMapper.Action.INTERACT,
		"timestamp_msec": Time.get_ticks_msec(),
		"action_data": {
			"target_entity_id": null,
			"verb": "DialogueEnd",
		},
	})