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517 lines
16 KiB
Rust
517 lines
16 KiB
Rust
use bevy::utils::HashSet;
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use crate::prelude::*;
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pub(crate) struct GamePlugin;
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impl Plugin for GamePlugin {
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fn build(&self, app: &mut App) {
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app.add_event::<Move>()
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.add_systems(Startup, setup_board)
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.add_systems(
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Update,
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(
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menu::exit_to_menu.run_if(in_state(GameState::Play)),
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update_board.run_if(on_event::<Move>()).after(select_sync),
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set_side.run_if(on_event::<Move>()), // TODO: correct run_if?
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cancel_place.run_if(|buttons: Res<Input<MouseButton>>| -> bool {
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buttons.just_pressed(MouseButton::Right)
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}),
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select_sync
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.run_if(any_component_added::<Selected>)
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.after(deselect_sync),
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deselect_sync.run_if(any_component_removed::<Selected>()),
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move_piece.run_if(any_component_added::<Selected>),
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capture_piece.run_if(any_component_added::<Captured>),
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null_selections.run_if(any_component_added::<Selected>),
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pick_up_audio::<display2d::Display2d>
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.run_if(in_state(DisplayState::Display2d))
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.run_if(any_component_added::<Selected>),
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pick_up_audio::<display3d::Display3d>
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.run_if(in_state(DisplayState::Display3d))
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.run_if(any_component_added::<Selected>),
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),
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)
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.add_systems(
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PreUpdate,
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(
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asserts::<display2d::Display2d>,
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asserts::<display3d::Display3d>,
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),
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)
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.add_systems(
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PostUpdate,
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(debug_board.run_if(resource_exists::<debug::DebugEnabled>()),),
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);
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}
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}
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#[derive(Debug, Component, Clone, PartialEq, Copy)]
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pub(crate) enum Piece {
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Pawn,
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Drone,
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Queen,
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}
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#[derive(Debug, Component, Clone, PartialEq)]
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pub(crate) enum Tile {
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Dark,
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Light,
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}
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pub(crate) fn tiles() -> impl Iterator<Item = (BoardIndex, Tile)> {
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(0..32).map(|i| {
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let x = i % 8;
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let y = i / 8;
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let s = (x % 2) ^ (y % 2);
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let index = BoardIndex { x, y };
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let tile = if s == 0 { Tile::Dark } else { Tile::Light };
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(index, tile)
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})
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}
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#[derive(Debug, Component)]
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pub(crate) struct BoardComponent;
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#[derive(Debug, Component)]
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pub(crate) struct Captured;
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// manually for the type.
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impl std::fmt::Display for Piece {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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match self {
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Piece::Queen => write!(f, "@"),
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Piece::Drone => write!(f, "^"),
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Piece::Pawn => write!(f, "*"),
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}
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}
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}
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#[derive(Debug)]
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pub(crate) enum GameError {
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NullMove,
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InvalidIndex,
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}
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/// The board is setup like this:
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/// ```text
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/// 0 1 2 3 4 5 6 7
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/// +--+--+--+--+--+--+--+--+
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/// a | | | | I | d| Q| Q|
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/// +--+--+--+--+--+--+--+--+
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/// b |d |p |p | I | p| d| Q|
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/// +--+--+--+--+--+--+--+--+
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/// c |Q |d |p | I | p| p| d|
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/// +--+--+--+--+--+--+--+--+
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/// d |Q |Q |d | I | | | |
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/// +--+--+--+--+--+--+--+--+
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/// ````
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#[derive(Debug, Resource)]
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pub(crate) struct Board {
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inner: Vec<Vec<Option<Piece>>>,
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moves: Vec<Move>,
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}
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#[derive(Debug, Default, Event, Clone)]
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pub(crate) struct Move {
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pub epoch: usize,
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pub from: BoardIndex,
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pub to: Option<BoardIndex>,
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}
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#[derive(Debug, Component, PartialEq, Clone, Default, Copy, Eq, Hash)]
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pub(crate) struct BoardIndex {
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pub x: usize,
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pub y: usize,
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}
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#[derive(Debug, Component, PartialEq)]
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pub(crate) enum Side {
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A,
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B,
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}
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impl Board {
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/// Returns the piece at the given location
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pub(crate) fn at(&self, BoardIndex { x, y }: BoardIndex) -> Option<&Piece> {
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self.inner[y][x].as_ref()
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}
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/// Returns a list of all pieces on the board with their location
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pub(crate) fn pieces(&self) -> Vec<(BoardIndex, Piece)> {
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self.inner
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.iter()
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.enumerate()
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.flat_map(|(y, nested)| {
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nested.iter().enumerate().filter_map(move |(x, p)| {
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p.as_ref().map(|val| (BoardIndex { x, y }, val.clone()))
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})
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})
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.collect()
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}
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/// Moves a piece from -> to
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pub(crate) fn move_piece(
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&mut self,
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from: BoardIndex,
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to: BoardIndex,
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) -> Result<Vec<Move>, GameError> {
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if from == to {
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Err(GameError::NullMove)
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} else {
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match self.at(from.clone()) {
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Some(from_val) => {
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// The current epoch is the last epoch + 1
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let epoch = self.current_epoch();
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// Local moves vec we can return
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let mut moves = vec![];
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// If the position we are moving to is occupied, capture the removal in the ledger
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if self.inner[to.y][to.x].is_some() {
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moves.push(Move {
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epoch,
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from: to.clone(),
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to: None,
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});
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}
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// Capture the intened move in the moves ledger
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moves.push(Move {
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epoch,
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from: from.clone(),
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to: Some(to.clone()),
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});
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self.inner[to.y][to.x] = Some(*from_val);
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self.inner[from.y][from.x] = None;
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self.moves.extend(moves.clone());
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Ok(moves)
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}
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None => Err(GameError::NullMove),
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}
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}
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}
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/// Returns the Side of a piece
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pub(crate) fn side(BoardIndex { x, .. }: BoardIndex) -> Result<Side, GameError> {
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match x {
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0..=3 => Ok(Side::A),
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4..=7 => Ok(Side::B),
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_ => Err(GameError::InvalidIndex),
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}
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}
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/// Returns the possible moves the piece at this tile can make.
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pub(crate) fn possible_moves(&self, BoardIndex { x, y }: BoardIndex) -> HashSet<BoardIndex> {
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let f = |(a, b): (Option<usize>, Option<usize>)| {
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if let (Some(x), Some(y)) = (a, b) {
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if (0..=7).contains(&x) && (0..=3).contains(&y) {
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Some(BoardIndex { x, y })
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} else {
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None
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}
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} else {
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None
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}
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};
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match self.at(BoardIndex { x, y }) {
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// One space in any diagonal
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Some(Piece::Pawn) => std::iter::empty()
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.chain(
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(-1..=1)
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.zip(-1..=1)
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.map(move |(a, b)| (x.checked_add_signed(a), y.checked_add_signed(b))),
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)
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.chain(
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(-1..=1)
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.zip((-1..=1).rev())
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.map(move |(a, b)| (x.checked_add_signed(a), y.checked_add_signed(b))),
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)
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.filter_map(f)
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.collect(),
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// One or two spaces in either horizontal
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Some(Piece::Drone) => std::iter::empty()
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.chain((-2..=2).map(|i| (x.checked_add_signed(i), Some(y))))
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.chain((-2..=2).map(|i| (Some(x), y.checked_add_signed(i))))
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.filter_map(f)
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.collect(),
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// Any distance in any straight line
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Some(Piece::Queen) => std::iter::empty()
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.chain((-7..=7).map(|i| (x.checked_add_signed(i), Some(y))))
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.chain((-3..=3).map(|i| (Some(x), y.checked_add_signed(i))))
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.chain(
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(-3..=3)
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.zip(-3..=3)
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.map(move |(a, b)| (x.checked_add_signed(a), y.checked_add_signed(b))),
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)
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.chain(
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(-3..=3)
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.zip((-3..=3).rev())
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.map(move |(a, b)| (x.checked_add_signed(a), y.checked_add_signed(b))),
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)
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.filter_map(f)
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.collect(),
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None => std::iter::empty().collect(),
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}
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}
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pub(crate) fn current_epoch(&self) -> usize {
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self.moves.last().unwrap_or(&Move { ..default() }).epoch + 1
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}
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}
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impl std::fmt::Display for Board {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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self.inner.iter().rev().for_each(|row| {
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let _ = write!(f, "+--+--+--+--+--+--+--+--+\n");
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let _ = write!(f, "|");
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row.iter().for_each(|piece| {
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let _ = match piece {
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Some(p) => write!(f, "{} |", p),
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None => write!(f, " |"),
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};
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});
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let _ = write!(f, "\n");
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});
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let _ = write!(f, "+--+--+--+--+--+--+--+--+");
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Ok(())
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}
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}
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/// Marker component for currently selected entities
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#[derive(Debug, Default, Component)]
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pub(crate) struct Selected;
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/// Marker component for selectable entities
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#[derive(Debug, Default, Component)]
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pub(crate) struct Selectable;
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fn setup_board(mut commands: Commands) {
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use Piece::*;
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commands.insert_resource(Board {
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moves: vec![],
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inner: vec![
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vec![
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Some(Queen),
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Some(Queen),
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Some(Drone),
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None,
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None,
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None,
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None,
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None,
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],
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vec![
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Some(Queen),
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Some(Drone),
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Some(Pawn),
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None,
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None,
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Some(Pawn),
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Some(Pawn),
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Some(Drone),
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],
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vec![
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Some(Drone),
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Some(Pawn),
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Some(Pawn),
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None,
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None,
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Some(Pawn),
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Some(Drone),
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Some(Queen),
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],
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vec![
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None,
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None,
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None,
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None,
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None,
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Some(Drone),
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Some(Queen),
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Some(Queen),
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],
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],
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});
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}
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fn debug_board(board: Res<Board>, mut debug_info: ResMut<debug::DebugInfo>) {
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debug_info.set("board".into(), format!("\n{}", *board));
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}
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/// Update this method to use a diff between the board and the state of the 2d/3d worlds
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pub(crate) fn update_board(
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mut events: EventReader<Move>,
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mut pieces: Query<(Entity, &mut BoardIndex), With<Piece>>,
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selected: Query<Entity, With<Selected>>,
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mut commands: Commands,
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) {
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events.iter().for_each(|Move { from, to, .. }| {
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pieces.iter_mut().for_each(|(entity, mut index)| {
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if *index == *from {
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match to {
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Some(to_idx) => {
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info!("Moving piece {:?} to {:?}", entity, to_idx);
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*index = to_idx.clone();
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}
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None => {
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info!("Capturing piece {:?}", entity);
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commands
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.entity(entity)
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.remove::<BoardIndex>()
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.insert(Captured);
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}
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}
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}
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});
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selected.iter().for_each(|entity| {
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info!("De-selecting selected piece {:?}", entity);
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commands.entity(entity).remove::<Selected>();
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});
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})
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}
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pub(crate) fn set_side(mut events: Query<(&mut Side, &BoardIndex), Changed<BoardIndex>>) {
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events
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.iter_mut()
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.for_each(|(mut side, idx)| match Board::side(*idx) {
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Ok(s) => {
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debug!("Set side event {:?} {:?} -> {:?}", idx, side, s);
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if *side != s {
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*side = s
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}
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}
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Err(e) => warn!("{:?}", e),
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});
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}
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fn select_sync(
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events: Query<Entity, Added<Selected>>,
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pieces: Query<(Entity, &BoardIndex), (With<Selectable>, With<Piece>)>,
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mut commands: Commands,
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) {
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events.iter().for_each(|entity| {
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if let Ok((this_e, this_idx)) = pieces.get(entity) {
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if let Some((entangled, _)) = pieces
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.iter()
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.find(|(e, idx)| *idx == this_idx && *e != this_e)
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{
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commands.entity(entangled).insert(Selected);
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}
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}
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})
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}
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fn deselect_sync(
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mut events: RemovedComponents<Selected>,
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pieces: Query<(Entity, &BoardIndex), (With<Selectable>, With<Piece>)>,
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mut commands: Commands,
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) {
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events.iter().for_each(|entity| {
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if let Ok((this_e, this_idx)) = pieces.get(entity) {
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if let Some((entangled, _)) = pieces
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.iter()
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.find(|(e, idx)| *idx == this_idx && *e != this_e)
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{
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info!("De-selecting entangled piece {:?}", entity);
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commands.entity(entangled).remove::<Selected>();
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}
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}
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})
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}
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/// Triggered when right-mouse-button clicked
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fn cancel_place(current: Query<Entity, With<Selected>>, mut commands: Commands) {
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current.iter().for_each(|entity| {
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info!("De-selecting {:?}", entity);
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commands.entity(entity).remove::<Selected>();
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});
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}
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/// When a tile is selected, move all selected pieces to that index
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fn move_piece(
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events: Query<&BoardIndex, (With<BoardIndex>, Added<Selected>)>,
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selected_pieces: Query<&BoardIndex, (With<Selected>, With<Piece>)>,
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mut board: ResMut<Board>,
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mut move_events: EventWriter<Move>,
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mut writer: EventWriter<audio::AudioEvent>,
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) {
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events.iter().for_each(|to| {
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selected_pieces.iter().for_each(|from| {
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if from != to {
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info!("Applying move {:?} -> {:?}", from, to);
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// Move piece
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match board.move_piece(*from, *to) {
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Ok(moves) => {
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// De-select the piece
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info!("Applying moves {:?}", moves);
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moves.iter().for_each(|m| move_events.send(m.clone()));
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writer.send(audio::AudioEvent::PutDown)
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}
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Err(GameError::NullMove) => warn!("Null move!"),
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Err(GameError::InvalidIndex) => warn!("Invalid index!"),
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}
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}
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});
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});
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}
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fn pick_up_audio<D: Component>(
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selected: Query<Entity, (With<Selected>, With<Piece>, With<D>)>,
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mut writer: EventWriter<audio::AudioEvent>,
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) {
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if selected.iter().len() == 1 {
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writer.send(audio::AudioEvent::PickUp);
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}
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}
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/// De-select anything that shouldn't be selected
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/// Namely tiles when there are not selected pieces
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fn null_selections(
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events: Query<Entity, Added<Selected>>,
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selected_pieces: Query<Entity, (With<Selected>, With<Piece>)>,
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mut commands: Commands,
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mut writer: EventWriter<audio::AudioEvent>,
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) {
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events.iter().for_each(|entity| {
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if selected_pieces.is_empty() {
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info!(
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"De-selecting piece that should not be selected {:?}",
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entity
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);
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commands.entity(entity).remove::<Selected>();
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writer.send(audio::AudioEvent::PutDown);
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}
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});
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}
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/// When a piece's _BoardIndex_ is removed, we hide that entity from the viewer
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fn capture_piece(mut events: Query<&mut Visibility, Added<Captured>>) {
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events.iter_mut().for_each(|mut vis| {
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info!("Hiding captured piece");
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*vis = Visibility::Hidden
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});
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}
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/// Panics if more than two pieces are selected at a time
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fn asserts<T: Component>(
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selected_pieces: Query<Entity, (With<Piece>, With<T>, With<Selected>)>,
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selected_tiles: Query<Entity, (With<Tile>, With<T>, With<Selected>)>,
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) {
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if selected_pieces.iter().len() > 2 {
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panic!("More than two pieces selected");
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}
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if selected_tiles.iter().len() > 2 {
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panic!(
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"More than two tiles selected {:?}",
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selected_tiles.iter().len()
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);
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}
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}
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