extends Control

## #503: Auto-checklist HUD overlay — shows condition progress in Gauntlet mode.
## Renders below the GauntletHUD timer. Each condition shows a check/dash + description.
## Only visible in gauntlet_mode. Latched conditions stay checked.
##
## Spec ref: D-030 (testability), #503, Sprint 10 Completion Proof.

const ChecklistEvaluator = preload("res://scripts/checklist/checklist_evaluator.gd")

const BG_COLOR := Color(0.05, 0.05, 0.08, 0.45)
const MET_COLOR := Color("#6bc9a6")        # Friendly green — condition met
const UNMET_COLOR := Color("#8890a0")      # Dim grey — condition pending
const HEADER_COLOR := Color("#c8d0e0")     # Insert text color — header/summary
const COMPLETE_COLOR := Color("#e8c547")   # Amber — all conditions met
const FONT_SIZE := 11
const LINE_HEIGHT := 16
const PADDING := Vector2(8, 6)
const MAX_DESC_CHARS := 52  # Truncate long descriptions

var _evaluator = null  # ChecklistEvaluator instance
var _last_room_id: Variant = null
var _cached_font: Font = null  # Cached to avoid per-frame theme lookup


func _ready() -> void:
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	visible = false
	_evaluator = ChecklistEvaluator.new()
	_cached_font = get_theme_default_font()


func update_from_state() -> void:
	if not GameState.gauntlet_mode:
		if visible:
			visible = false
		return

	if not visible:
		visible = true

	var room_id: Variant = GameState.room_id
	if room_id == null:
		if _evaluator.is_loaded():
			_evaluator.reset()
			_last_room_id = null
			queue_redraw()
		return

	# Load checklist on room change
	if room_id != _last_room_id:
		_evaluator.load_room(str(room_id))
		_last_room_id = room_id

	# Evaluate conditions against current snapshot
	_evaluator.evaluate()
	queue_redraw()


func _draw() -> void:
	if _evaluator == null or not _evaluator.is_loaded():
		return

	var font: Font = _cached_font if _cached_font else get_theme_default_font()
	var results: Array = _evaluator.get_results()
	if results.is_empty():
		return

	var met_count: int = _evaluator.get_met_count()
	var total_count: int = _evaluator.get_total_count()
	var all_complete: bool = _evaluator.is_complete()

	# Header line: "CHECK: 5/8"
	var header_text := "CHECK: %d/%d" % [met_count, total_count]
	var header_color: Color = COMPLETE_COLOR if all_complete else HEADER_COLOR

	# Calculate box height: header + one line per condition + padding
	var line_count: int = 1 + results.size()
	var box_height: float = PADDING.y * 2 + line_count * LINE_HEIGHT

	# Calculate box width from longest line
	var max_width: float = font.get_string_size(header_text, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE).x
	for r in results:
		var desc: String = r.get("description", r.get("id", ""))
		if desc.length() > MAX_DESC_CHARS:
			desc = desc.substr(0, MAX_DESC_CHARS - 1) + "..."
		var prefix: String = "[x] " if r.get("met", false) else "[ ] "
		var line_width: float = font.get_string_size(prefix + desc, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE).x
		if line_width > max_width:
			max_width = line_width

	var box_width: float = max_width + PADDING.x * 2

	# Background
	draw_rect(Rect2(Vector2.ZERO, Vector2(box_width, box_height)), BG_COLOR)

	# Header
	var y: float = PADDING.y + FONT_SIZE
	draw_string(font, Vector2(PADDING.x, y), header_text, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE, header_color)

	# Condition lines
	for r in results:
		y += LINE_HEIGHT
		var is_met: bool = r.get("met", false)
		var prefix: String = "[x] " if is_met else "[ ] "
		var desc: String = r.get("description", r.get("id", ""))
		if desc.length() > MAX_DESC_CHARS:
			desc = desc.substr(0, MAX_DESC_CHARS - 1) + "..."
		var color: Color = MET_COLOR if is_met else UNMET_COLOR
		draw_string(font, Vector2(PADDING.x, y), prefix + desc, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE, color)


# -- Public API ---------------------------------------------------------------

func get_evaluator():
	return _evaluator


func get_met_count() -> int:
	if _evaluator == null:
		return 0
	return _evaluator.get_met_count()


func get_total_count() -> int:
	if _evaluator == null:
		return 0
	return _evaluator.get_total_count()


func is_complete() -> bool:
	if _evaluator == null:
		return false
	return _evaluator.is_complete()