extends SceneTree

# Drives the flashcards study screen's reveal/grading render logic and keyboard mapping
# directly (no network): the screen is added to the tree so _ready() builds its controls and
# wires the FlashcardService signal connections, but no method that would send an HTTP
# request (submit_review/request_next_card) is invoked.

var failures := 0


func _initialize() -> void:
	var Study := load("res://scripts/ui/flashcards_study.gd")
	var screen = Study.new()
	screen._build()

	# Keyboard grading shortcuts: 1-4 map to Again/Hard/Good/Easy; everything else is inert.
	_assert(Study.rating_for_keycode(KEY_1) == "again", "1 should grade Again")
	_assert(Study.rating_for_keycode(KEY_2) == "hard", "2 should grade Hard")
	_assert(Study.rating_for_keycode(KEY_3) == "good", "3 should grade Good")
	_assert(Study.rating_for_keycode(KEY_4) == "easy", "4 should grade Easy")
	_assert(Study.rating_for_keycode(KEY_5) == "", "keys outside 1-4 should not grade a card")

	# Basic card: front-first, then reveal shows answer + extra and the four graded options.
	screen.current_note = {"type": "basic", "prompt": "2 + 2 = ?", "answer": "4", "extra": "Basic arithmetic"}
	screen.current_card = {"id": "card-1", "variant": 0, "revision": 1}
	screen.rating_options = [
		{"rating": "again", "intervalLabel": "<1m"}, {"rating": "hard", "intervalLabel": "6m"},
		{"rating": "good", "intervalLabel": "1d"}, {"rating": "easy", "intervalLabel": "4d"}
	]
	screen._render_card()
	_assert(screen.front_label.text == "2 + 2 = ?", "the front should show only the prompt before reveal")
	_assert(screen.tap_hint_label.visible, "the tap-to-reveal hint should be visible before the answer is shown")
	_assert(not screen.grade_row.visible, "grading buttons should be hidden before reveal")
	_assert(not screen.back_label.visible, "the back should stay hidden before reveal")

	screen._reveal()
	_assert(screen.back_label.text == "4", "reveal should show the answer on its own, separate from the extra pearl")
	_assert(screen.extra_label.text == "Basic arithmetic" and screen.extra_label.visible, "the extra takeaway should render in its own labeled section")
	_assert(screen.answer_caption.visible and screen.extra_caption.visible, "revealing a card with an extra should show both the answer and takeaway captions")
	_assert(screen.grade_row.visible, "grading buttons should appear after reveal")
	_assert(not screen.tap_hint_label.visible, "the tap-to-reveal hint should hide once the card is revealed")
	_assert(screen.grade_buttons["good"].text.contains("1d"), "each grade button should show its computed next interval")

	# Cloze card: only the card's own variant is hidden on the front; back reveals everything.
	screen.current_note = {"type": "cloze", "prompt": "{{c1::Paris}} is the capital of France", "answer": "", "extra": "European capitals are a classic Step 3 target"}
	screen.current_card = {"id": "card-2", "variant": 1, "revision": 1}
	screen.revealed = false
	screen._render_card()
	_assert(screen.front_label.text == "[...] is the capital of France", "cloze front should hide only its own variant")
	screen._reveal()
	_assert(screen.back_label.text == "Paris is the capital of France", "cloze back should reveal every deletion")
	_assert(screen.extra_label.text == "European capitals are a classic Step 3 target" and screen.extra_label.visible,
		"a cloze note's extra takeaway should also render (previously silently dropped since only basic notes combined answer+extra into one label)")

	# A card with no extra should hide the takeaway section entirely rather than show an empty caption.
	screen.current_note = {"type": "basic", "prompt": "What is 1 + 1?", "answer": "2", "extra": ""}
	screen.current_card = {"id": "card-3", "variant": 0, "revision": 1}
	screen.revealed = false
	screen._render_card()
	screen._reveal()
	_assert(not screen.extra_label.visible and not screen.extra_caption.visible, "a card with no extra takeaway should hide that section instead of showing an empty caption")

	# Tapping the card panel reveals the answer, same as pressing Space.
	screen.current_note = {"type": "basic", "prompt": "Tap test", "answer": "Tapped", "extra": ""}
	screen.current_card = {"id": "card-4", "variant": 0, "revision": 1}
	screen.revealed = false
	screen._render_card()
	var click := InputEventMouseButton.new()
	click.button_index = MOUSE_BUTTON_LEFT
	click.pressed = true
	screen._on_card_panel_input(click)
	_assert(screen.revealed and screen.back_label.text == "Tapped", "clicking the card panel should reveal the answer")

	# A second tap after reveal (or while browsing history) is a no-op - it must not re-trigger
	# any reveal side effects (grading is guarded elsewhere; this only checks idempotence).
	screen.back_label.text = "Tapped"
	screen._on_card_panel_input(click)
	_assert(screen.back_label.text == "Tapped", "tapping an already-revealed card should be a no-op")

	screen.free()
	quit(1 if failures > 0 else 0)


func _assert(condition: bool, message: String) -> void:
	if condition:
		return
	failures += 1
	push_error(message)