class_name OperationsCameraControls
extends HBoxContainer

## Presentation-only camera and navigation controls providing click alternatives
## for pointer drag, wheel scroll, and modifier-based navigation.
## Does not alter the underlying simulation model or game state.

const LayerSkin := preload("res://scripts/ui/layer_interface_skin.gd")

signal zoom_in_requested
signal zoom_out_requested
signal reset_view_requested
signal pan_requested(direction: Vector2)
signal grid_toggle_requested
signal layer_toggle_requested

var zoom_in_button: Button
var zoom_out_button: Button
var reset_button: Button
var pan_up_button: Button
var pan_down_button: Button
var pan_left_button: Button
var pan_right_button: Button
var grid_button: Button
var layer_button: Button

var _world_preview: Variant
var _main_scene: Variant
var _buttons: Array[Button] = []


func _init() -> void:
	name = "OperationsCameraControls"
	add_theme_constant_override("separation", 4)


func _ready() -> void:
	_build_ui()


func configure(preview: Variant, main_scene: Variant = null) -> void:
	_world_preview = preview
	_main_scene = main_scene


func _build_ui() -> void:
	# Navigation Pan Buttons
	pan_left_button = _create_button("◀", "左へ移動", func() -> void: _on_pan_step(Vector2(1, 0)))
	pan_up_button = _create_button("▲", "上へ移動", func() -> void: _on_pan_step(Vector2(0, 1)))
	pan_down_button = _create_button("▼", "下へ移動", func() -> void: _on_pan_step(Vector2(0, -1)))
	pan_right_button = _create_button("▶", "右へ移動", func() -> void: _on_pan_step(Vector2(-1, 0)))

	# Zoom Buttons
	zoom_in_button = _create_button("＋", "拡大表示", _on_zoom_in)
	zoom_out_button = _create_button("－", "縮小表示", _on_zoom_out)

	# Reset / Focus
	reset_button = _create_button("全体", "表示範囲全体を収める", _on_reset_view)

	# Grid & Layer Toggle
	grid_button = _create_button("マス目", "グリッド線の表示／非表示を切り替え", _on_grid_toggle)
	layer_button = _create_button("表／裏", "フロアの表層／裏層を切り替え", _on_layer_toggle)


func _create_button(text_label: String, tooltip: String, callback: Callable) -> Button:
	var btn := Button.new()
	btn.text = text_label
	btn.tooltip_text = tooltip
	btn.custom_minimum_size = Vector2(30, 26)
	btn.focus_mode = Control.FOCUS_NONE
	btn.add_theme_font_size_override("font_size", 11)
	btn.pressed.connect(callback)
	add_child(btn)
	_buttons.append(btn)
	return btn


func _on_zoom_in() -> void:
	if _world_preview != null and _world_preview.has_method(&"set_zoom"):
		var current: float = float(_world_preview.get("zoom_level"))
		_world_preview.set_zoom(current + 0.5)
	zoom_in_requested.emit()


func _on_zoom_out() -> void:
	if _world_preview != null and _world_preview.has_method(&"set_zoom"):
		var current: float = float(_world_preview.get("zoom_level"))
		_world_preview.set_zoom(current - 0.5)
	zoom_out_requested.emit()


func _on_pan_step(direction: Vector2) -> void:
	var delta := Vector2(32, 48) * direction
	if _world_preview != null:
		if _world_preview.has_method(&"_cell_dimensions"):
			var dims: Vector2 = _world_preview.call(&"_cell_dimensions")
			delta = direction * dims
		var offset: Vector2 = _world_preview.get("pan_offset")
		_world_preview.set("pan_offset", offset + delta)
		if _world_preview.has_method(&"_clamp_pan"):
			_world_preview.call(&"_clamp_pan")
		_world_preview.queue_redraw()
	pan_requested.emit(delta)


func _on_pan(delta: Vector2) -> void:
	if _world_preview != null:
		var offset: Vector2 = _world_preview.get("pan_offset")
		_world_preview.set("pan_offset", offset + delta)
		if _world_preview.has_method(&"_clamp_pan"):
			_world_preview.call(&"_clamp_pan")
		_world_preview.queue_redraw()
	pan_requested.emit(delta)


func _on_reset_view() -> void:
	if _world_preview != null:
		if _world_preview.has_method(&"focus_operating_area"):
			_world_preview.call(&"focus_operating_area")
		elif _world_preview.has_method(&"reset_view"):
			_world_preview.call(&"reset_view")
	reset_view_requested.emit()


func _on_grid_toggle() -> void:
	if _world_preview != null:
		var current_grid: bool = bool(_world_preview.get("show_grid"))
		_world_preview.set("show_grid", not current_grid)
		_world_preview.queue_redraw()
	grid_toggle_requested.emit()


func _on_layer_toggle() -> void:
	if _main_scene != null and _main_scene.has_method(&"_toggle_layer"):
		_main_scene.call(&"_toggle_layer")
	elif _world_preview != null:
		var current_mode: int = int(_world_preview.get("layer_mode"))
		_world_preview.set("layer_mode", 1 if current_mode == 0 else 0)
	layer_toggle_requested.emit()


func apply_layer_skin(layer: int) -> void:
	for btn: Button in _buttons:
		LayerSkin.register_toggle_text(btn, layer)
	LayerSkin.apply_tree(self, layer)