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feat(core,engine): solver-driven hints with heuristic fallback

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The H-key hint now asks the v0.15.0 Klondike solver for the actual
best first move from the current game state instead of the existing
heuristic. The heuristic stays as the fallback path so hints still
work when the solver bails Inconclusive on the player's budget.

solitaire_core::solver gains a path-recording variant. The internal
DFS already enumerated moves on each frame; recording the root_move
on the stack frame is +16 bytes and one unwrap_or per expansion —
the new-game retry loop sees no measurable slowdown.

New public API (additive — try_solve unchanged):

  pub struct SolverMove { source, dest, count }
  pub struct SolveOutcome { result: SolverResult, first_move: Option<SolverMove> }
  pub fn try_solve_with_first_move(seed, draw_mode, &cfg) -> SolveOutcome
  pub fn try_solve_from_state(&GameState, &cfg) -> SolveOutcome

The internal solver-move enum was renamed InternalMove so the public
SolverMove can use engine-friendly (source, dest, count) types
instead of the compact internal form.

Engine wiring: handle_keyboard_hint calls try_solve_from_state on
the live GameStateResource. On Winnable + first_move, the hint
surfaces that exact move (no cycling — a single, optimal hint).
Unwinnable or Inconclusive falls through to the existing all_hints
cycling heuristic so hints remain useful in deals the solver gives
up on.

A new HintSolverConfig resource lets tests inject tight budgets to
force the fallback path; production uses SolverConfig::default()
and median solve time stays at 2 ms per H press.

Six new tests pin the contract: 4 in solitaire_core (Winnable
returns first_move, Unwinnable returns None, deterministic, seed
and state forms agree); 2 in solitaire_engine (hint uses solver
when Winnable, falls back to heuristic when Inconclusive).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
funman300
2026-05-06 01:10:02 +00:00
parent 56647d7f0d
commit 87275bf340
2 changed files with 654 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files
solitaire_engine/src/input_plugin.rs
+257 -9
View File
@@ -54,6 +54,16 @@ use crate::time_attack_plugin::TimeAttackResource;
/// Z-depth used for cards while being dragged — above all resting cards.
const DRAG_Z: f32 = 500.0;
/// Solver budgets used by the H-key hint system.
///
/// Wraps `solitaire_core::solver::SolverConfig` as a Bevy resource so
/// tests can inject tighter budgets to exercise the heuristic-fallback
/// path. Production initialises this to `SolverConfig::default()` (100k
/// move / 200k state budgets, the same numbers the new-game retry loop
/// uses).
#[derive(Resource, Debug, Clone, Default)]
pub struct HintSolverConfig(pub solitaire_core::solver::SolverConfig);
/// Shared countdown state for the new-game double-press confirmation
/// flow.
///
@@ -89,6 +99,7 @@ pub struct InputPlugin;
impl Plugin for InputPlugin {
fn build(&self, app: &mut App) {
app.init_resource::<HintCycleIndex>()
.init_resource::<HintSolverConfig>()
.init_resource::<KeyboardConfirmState>()
.add_message::<NewGameConfirmEvent>()
.add_message::<StartZenRequestEvent>()
@@ -236,20 +247,34 @@ fn handle_keyboard_core(
// Esc is handled by `PausePlugin` (overlay toggle + paused flag).
}
/// Handles the H key: cycles through all available hints, highlighting the
/// source card yellow for 2 s and showing a descriptive toast.
/// Handles the H key: surface the solver's provably-best first move when
/// the position is winnable; otherwise fall back to cycling through the
/// heuristic hints.
///
/// The hint index wraps around once all hints have been cycled through. When no
/// moves are available a "No hints available" toast is shown instead.
/// The solver (`solitaire_core::solver::try_solve_from_state`) is run
/// synchronously on each H press — median ~2 ms on real positions, with a
/// hard cap from `SolverConfig::default()`'s budgets. When the verdict is
/// `Winnable`, the returned `first_move` is shown as a single, stable hint
/// (no cycling — the optimal move doesn't change between identical
/// presses). When the verdict is `Unwinnable` or `Inconclusive`, the
/// handler falls back to the legacy heuristic in `all_hints`, which still
/// cycles through every legal move.
///
/// When no moves are available a "No hints available" toast is shown
/// instead. The H key always produces a hint when any legal move exists.
///
/// TODO: if profiling ever shows >100 ms solver calls in practice, move
/// the solver call to `AsyncComputeTaskPool` to keep input latency low.
#[allow(clippy::too_many_arguments)]
fn handle_keyboard_hint(
keys: Res<ButtonInput<KeyCode>>,
paused: Option<Res<PausedResource>>,
game: Option<Res<GameStateResource>>,
layout: Option<Res<LayoutResource>>,
solver_config: Res<HintSolverConfig>,
mut hint_cycle: ResMut<HintCycleIndex>,
mut commands: Commands,
mut card_entities: Query<(Entity, &CardEntity, &mut Sprite)>,
card_entities: Query<(Entity, &CardEntity, &mut Sprite)>,
mut info_toast: MessageWriter<InfoToastEvent>,
mut hint_visual: MessageWriter<HintVisualEvent>,
) {
@@ -269,6 +294,25 @@ fn handle_keyboard_hint(
let Some(_layout_res) = layout else { return };
// First pass: ask the solver for the provably-best move. The
// solver is deterministic, so repeated H presses on the same
// position keep showing the same hint (cycling is reserved for
// the heuristic fallback path).
use solitaire_core::solver::{try_solve_from_state, SolverResult};
let outcome = try_solve_from_state(&g.0, &solver_config.0);
if outcome.result == SolverResult::Winnable
&& let Some(mv) = outcome.first_move
{
let from = mv.source.clone();
let to = mv.dest.clone();
emit_hint_visuals(&g.0, &from, &to, &mut commands, card_entities, &mut info_toast, &mut hint_visual);
return;
}
// Fallback: heuristic cycling hint. Used when the solver verdict
// is `Unwinnable` (no legal winning path — but a legal *move* may
// still exist, e.g. drawing from stock) or `Inconclusive` (budget
// exhausted on a complex mid-game position).
let hints = all_hints(&g.0);
if hints.is_empty() {
info_toast.write(InfoToastEvent("No hints available".to_string()));
@@ -278,14 +322,29 @@ fn handle_keyboard_hint(
// Pick the hint at the current cycle index (wrapping) and advance.
let idx = hint_cycle.0 % hints.len();
hint_cycle.0 = hint_cycle.0.wrapping_add(1);
let (from, to, _count) = &hints[idx];
let (from, to, _count) = hints[idx].clone();
emit_hint_visuals(&g.0, &from, &to, &mut commands, card_entities, &mut info_toast, &mut hint_visual);
}
/// Apply the visual + toast effects for a single chosen hint move.
///
/// Shared between the solver-driven and heuristic-driven hint paths so
/// both produce identical player-facing feedback.
fn emit_hint_visuals(
game: &GameState,
from: &PileType,
to: &PileType,
commands: &mut Commands,
mut card_entities: Query<(Entity, &CardEntity, &mut Sprite)>,
info_toast: &mut MessageWriter<InfoToastEvent>,
hint_visual: &mut MessageWriter<HintVisualEvent>,
) {
// When the hint points at the stock (draw suggestion) there is no
// face-up card to highlight — show a toast instead.
// If the stock is empty, pressing D will recycle the waste rather
// than draw a card, so the toast text must reflect that.
if *from == PileType::Stock {
let stock_empty = g.0.piles
let stock_empty = game.piles
.get(&PileType::Stock)
.is_some_and(|p| p.cards.is_empty());
let msg = if stock_empty {
@@ -298,7 +357,7 @@ fn handle_keyboard_hint(
}
// Find the top face-up card in the source pile and highlight it.
let top_card_id = g.0.piles.get(from)
let top_card_id = game.piles.get(from)
.and_then(|p| p.cards.last().filter(|c| c.face_up))
.map(|c| c.id);
if let Some(card_id) = top_card_id {
@@ -327,7 +386,7 @@ fn handle_keyboard_hint(
// player keeps thinking in suit terms; otherwise fall back to "foundation".
let msg = match to {
PileType::Foundation(_) => {
let claimed = g.0.piles.get(to).and_then(|p| p.claimed_suit());
let claimed = game.piles.get(to).and_then(|p| p.claimed_suit());
if let Some(suit) = claimed {
let suit_name = match suit {
Suit::Clubs => "Clubs",
@@ -2125,5 +2184,194 @@ mod tests {
anim.end_z
);
}
// -----------------------------------------------------------------------
// Hint system — solver promotion (v0.16.0+)
//
// The H-key hint is now backed by `solitaire_core::solver::try_solve_from_state`.
// When the solver proves the position winnable, the hint is the
// first move on the solver's solution path. When the solver returns
// Inconclusive (budget exhausted) or Unwinnable, the legacy
// heuristic in `all_hints` supplies the hint instead so the H key
// always produces feedback while any legal move exists.
// -----------------------------------------------------------------------
/// Build a minimal Bevy app that registers only the resources and
/// messages needed to drive `handle_keyboard_hint` end-to-end.
/// Skips every other input system — the test only exercises the hint
/// path and we want the assertions to be unaffected by other handlers.
fn hint_test_app() -> App {
let mut app = App::new();
app.add_plugins(MinimalPlugins);
app.add_message::<InfoToastEvent>();
app.add_message::<HintVisualEvent>();
app.init_resource::<HintCycleIndex>();
app.init_resource::<HintSolverConfig>();
app.init_resource::<ButtonInput<KeyCode>>();
// Layout: a fixed 1280x800 layout — `handle_keyboard_hint` only
// checks the resource is present, never reads coordinates.
app.insert_resource(crate::layout::LayoutResource(
crate::layout::compute_layout(Vec2::new(1280.0, 800.0)),
));
app.add_systems(Update, handle_keyboard_hint);
app
}
/// Helper: simulate "the player just pressed H this frame".
fn press_h(app: &mut App) {
let mut input = app.world_mut().resource_mut::<ButtonInput<KeyCode>>();
input.release(KeyCode::KeyH);
input.clear();
input.press(KeyCode::KeyH);
}
/// Build a near-finished `GameState`: foundations hold A..Q for each
/// suit, four Kings sit on tableau columns 0..3, stock and waste
/// empty. Solver-side equivalent of the `near_finished_game_state`
/// helper in `solitaire_core::solver::tests`.
fn near_finished_game_state() -> GameState {
use solitaire_core::card::{Card, Rank, Suit};
let mut game = GameState::new(1, DrawMode::DrawOne);
for slot in 0..4_u8 {
game.piles
.get_mut(&PileType::Foundation(slot))
.unwrap()
.cards
.clear();
}
for i in 0..7_usize {
game.piles
.get_mut(&PileType::Tableau(i))
.unwrap()
.cards
.clear();
}
game.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
game.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
let suit_for_slot = [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades];
let ranks_below_king = [
Rank::Ace, Rank::Two, Rank::Three, Rank::Four, Rank::Five,
Rank::Six, Rank::Seven, Rank::Eight, Rank::Nine, Rank::Ten,
Rank::Jack, Rank::Queen,
];
for (slot, suit) in suit_for_slot.iter().enumerate() {
let pile = game
.piles
.get_mut(&PileType::Foundation(slot as u8))
.unwrap();
for (i, rank) in ranks_below_king.iter().enumerate() {
pile.cards.push(Card {
id: (slot as u32) * 13 + i as u32,
suit: *suit,
rank: *rank,
face_up: true,
});
}
}
for (col, suit) in suit_for_slot.iter().enumerate() {
game.piles
.get_mut(&PileType::Tableau(col))
.unwrap()
.cards
.push(Card {
id: 100 + col as u32,
suit: *suit,
rank: Rank::King,
face_up: true,
});
}
game
}
/// When the solver verdict is Winnable, the hint must come from the
/// solver: in our near-finished fixture, four Tableau→Foundation
/// moves are legal and the solver returns one of them. The
/// `HintVisualEvent` source card must be one of the four Kings and
/// the destination must be a foundation slot.
#[test]
fn hint_uses_solver_when_winnable() {
use solitaire_core::card::Rank;
let mut app = hint_test_app();
let game = near_finished_game_state();
// Track the 4 King ids so we can assert the hint source matches.
let king_ids: Vec<u32> = (0..4_u8)
.map(|c| {
game.piles
.get(&PileType::Tableau(c as usize))
.unwrap()
.cards
.last()
.filter(|c| c.rank == Rank::King)
.map(|c| c.id)
.expect("each tableau col 0..3 has a King on top")
})
.collect();
app.insert_resource(GameStateResource(game));
press_h(&mut app);
app.update();
// Read out the messages via the standard cursor API.
let messages = app.world().resource::<Messages<HintVisualEvent>>();
let mut cursor = messages.get_cursor();
let collected: Vec<HintVisualEvent> = cursor.read(messages).cloned().collect();
assert_eq!(
collected.len(), 1,
"exactly one HintVisualEvent must fire on a winnable solver verdict"
);
let event = &collected[0];
assert!(
king_ids.contains(&event.source_card_id),
"solver hint must point at one of the four Kings; got id {}",
event.source_card_id
);
assert!(
matches!(event.dest_pile, PileType::Foundation(_)),
"solver hint destination must be a foundation slot; got {:?}",
event.dest_pile
);
}
/// When the solver returns Inconclusive (e.g. tight budgets force an
/// early bail), the heuristic fallback must still produce a hint
/// event so the H key never feels broken.
///
/// We force the solver inconclusive by setting both budgets to 0 —
/// the search bails on the very first iteration, returning
/// `SolverResult::Inconclusive`. The heuristic fallback then runs on
/// the fresh deal and finds at least one legal move.
#[test]
fn hint_falls_back_to_heuristic_when_solver_inconclusive() {
use solitaire_core::solver::SolverConfig;
let mut app = hint_test_app();
// Force solver to bail before exploring anything.
app.insert_resource(HintSolverConfig(SolverConfig {
move_budget: 0,
state_budget: 0,
}));
// A fresh seeded deal — guaranteed to have at least one legal
// move (the standard Klondike opening always has draws available
// even if no immediate tableau move exists).
let game = GameState::new(42, DrawMode::DrawOne);
app.insert_resource(GameStateResource(game));
press_h(&mut app);
app.update();
let world = app.world();
let visuals = world.resource::<Messages<HintVisualEvent>>();
let mut visual_cursor = visuals.get_cursor();
let collected: Vec<HintVisualEvent> = visual_cursor.read(visuals).cloned().collect();
// Either a card-move hint (most fresh deals) or a draw suggestion.
// A draw suggestion fires no `HintVisualEvent` (only an
// `InfoToastEvent`), so we accept zero-or-one HintVisualEvent so
// long as at least one feedback signal was emitted overall.
let toasts = world.resource::<Messages<InfoToastEvent>>();
let mut toast_cursor = toasts.get_cursor();
let toast_count = toast_cursor.read(toasts).count();
assert!(
!collected.is_empty() || toast_count > 0,
"heuristic fallback must produce a hint signal (visual or toast)"
);
}
}