extends Node

## Global keybinding manager (autoload `Controls`).
## Loads saved keyboard bindings on startup and applies them to InputMap so
## rebinds made in the intro menu persist into the game scene. Only the
## keyboard event of each action is overridden; joypad/mouse events are kept.

const SAVE_PATH := "user://controls.cfg"
const SECTION := "keybinds"

## Actions the options menu lets the player rebind (keyboard only).
const REBINDABLE_ACTIONS: PackedStringArray = [
	&"move_forward",
	&"move_back",
	&"move_left",
	&"move_right",
	&"ability_kick",
	&"ability_dash",
	&"ability_slam",
	&"ability_roll",
]


func _ready() -> void:
	load_saved()


## Whether to drive the game with the on-screen touch UI (joystick + buttons)
## instead of keyboard hints. Platform detection is cached (it can't change mid-run)
## so the per-frame/per-input callers don't repay the cost — but the DP force flag is
## re-read every call so the console can toggle the layout live on a desktop build.
var _touch_ui_cached: int = -1   # -1 = not yet detected, 0 = false, 1 = true


func use_touch_ui() -> bool:
	if DP.b("force_touch_controls"):
		return true
	if _touch_ui_cached == -1:
		_touch_ui_cached = 1 if _detect_touch_ui() else 0
	return _touch_ui_cached == 1


## True only on touch-primary devices (phones, tablets). Detection is deliberately
## conservative so a desktop never gets the on-screen thumb UI.
##
## DisplayServer.is_touchscreen_available() is unusable here on two fronts: on native
## desktop `emulate_touch_from_mouse` (on for testing) forces it true, and on the web build
## it maps to `'ontouchstart' in window`, which desktop Chromium reports true even with no
## touchscreen. So on web we ask the browser two questions instead: does it report touch
## points, AND is the *primary* pointer coarse? A desktop-with-mouse (even a touch laptop)
## answers no to the second and keeps the desktop HUD; a phone/tablet answers yes to both.
## maxTouchPoints also catches iPadOS, which masquerades as desktop Safari.
func _detect_touch_ui() -> bool:
	if (
		OS.has_feature("mobile")
		or OS.has_feature("web_android")
		or OS.has_feature("web_ios")
	):
		return true
	if not OS.has_feature("web"):
		return false
	var js := "(navigator.maxTouchPoints > 0) && window.matchMedia('(pointer: coarse)').matches"
	var touch_primary: Variant = JavaScriptBridge.eval(js, true)
	if touch_primary is bool:
		return touch_primary
	if touch_primary is int or touch_primary is float:
		return int(touch_primary) != 0
	return false


## Whether on-screen debug overlays (touch state + render diagnostics) should show. True on
## the DP "touch_debug" flag, or — so it can be switched on from a phone where no console is
## reachable — when the page URL carries a `debug` query param (append `?debug=1`).
var _url_debug: int = -1


func debug_overlay() -> bool:
	if DP.b("touch_debug"):
		return true
	if _url_debug == -1:
		_url_debug = 0
		if OS.has_feature("web"):
			var has: Variant = JavaScriptBridge.eval(
				"String(window.location.search).indexOf('debug') >= 0", true)
			if (has is bool and has) or ((has is int or has is float) and int(has) != 0):
				_url_debug = 1
	return _url_debug == 1


## Returns the first keyboard event bound to an action, or null.
func get_key_event(action: StringName) -> InputEventKey:
	for event: InputEvent in InputMap.action_get_events(action):
		if event is InputEventKey:
			return event
	return null


## Human-readable label for the action's current key (e.g. "W", "Space").
func get_key_label(action: StringName) -> String:
	var event := get_key_event(action)
	if event == null:
		return "—"
	return event.as_text_physical_keycode()


## Replaces the primary keyboard event of `action` with `event`, keeping
## every other event (e.g. arrow-key alternates, joypad) in its place.
func rebind(action: StringName, event: InputEventKey) -> void:
	rebind_no_save(action, event)
	save()


func save() -> void:
	var cfg := ConfigFile.new()
	for action: StringName in REBINDABLE_ACTIONS:
		var event := get_key_event(action)
		if event != null:
			cfg.set_value(SECTION, String(action), event.physical_keycode)
	cfg.save(SAVE_PATH)


func load_saved() -> void:
	var cfg := ConfigFile.new()
	if cfg.load(SAVE_PATH) != OK:
		return
	for action: StringName in REBINDABLE_ACTIONS:
		var key := String(action)
		if not cfg.has_section_key(SECTION, key):
			continue
		var keycode: int = cfg.get_value(SECTION, key)
		var event := InputEventKey.new()
		event.physical_keycode = keycode as Key
		rebind_no_save(action, event)


## Rebuilds the action's event list, swapping the first keyboard event for
## `event` in place so ordering (and thus the "primary" key) is preserved.
func rebind_no_save(action: StringName, event: InputEventKey) -> void:
	var events := InputMap.action_get_events(action)
	InputMap.action_erase_events(action)
	var replaced := false
	for existing: InputEvent in events:
		if not replaced and existing is InputEventKey:
			InputMap.action_add_event(action, event)
			replaced = true
		else:
			InputMap.action_add_event(action, existing)
	if not replaced:
		InputMap.action_add_event(action, event)


func reset_defaults() -> void:
	InputMap.load_from_project_settings()
	if FileAccess.file_exists(SAVE_PATH):
		DirAccess.remove_absolute(SAVE_PATH)