Add buttons, refactor, make it more mouse friendly

src/game.rs

@@ -1 +1,500 @@
+use std::fmt::{self, Display, Formatter};
+
+use button::{Button, ButtonAction};
+use macroquad::prelude::*;
+use sol_chess::{
+    board::{Board, BoardState},
+    generator,
+};
+use texture::PieceTexture;
+
+pub mod button;
 pub mod texture;
+
+pub struct Game {
+    // The generated puzzle. We keep a copy of this to reset the game.
+    original_board: Board,
+
+    // What is shown to the user
+    board: Board,
+
+    // Constants througout the game
+    texture_res: Texture2D,
+    num_squares: usize,
+    heading_font_size: f32,
+    heading_text: String,
+
+    // Update below on handle input
+    state: GameState,
+    debug: bool,
+
+    // Update below on window resize
+    // Used for drawing the state
+    square_width: f32,
+    window_height: f32,
+    window_width: f32,
+    squares: Vec<GameSquare>,
+    heading_rect: Rect,
+    btns: Vec<Button>,
+}
+
+struct GameSquare {
+    rect: Rect,
+    color: Color,
+    is_source: bool,
+    is_target: bool,
+    is_previous_target: bool,
+    i: usize,
+    j: usize,
+}
+
+#[derive(Copy, Clone)]
+enum GameState {
+    SelectSource(Option<(usize, usize)>),
+    SelectTarget((usize, usize)),
+    GameOver((usize, usize)),
+}
+
+impl Game {
+    pub fn new(board: Board, texture_res: Texture2D) -> Self {
+        let num_squares: usize = 4;
+
+        Self {
+            original_board: board.clone(),
+            board,
+            squares: Vec::new(),
+            heading_rect: Rect::new(0., 0., 0., 0.),
+            heading_text: "Solitaire Chess".to_string(),
+            heading_font_size: 0.,
+            num_squares,
+            texture_res,
+            state: GameState::SelectSource(None),
+            debug: false,
+            btns: Vec::new(),
+            window_height: 0.,
+            window_width: 0.,
+            square_width: 0.,
+        }
+    }
+
+    pub fn draw(&self) {
+        self.draw_heading();
+        self.draw_board();
+        self.draw_buttons();
+        self.draw_debug();
+    }
+
+    pub fn update_window_size(&mut self) {
+        let new_height = if screen_height() > 800.0 {
+            800.0
+        } else {
+            screen_height()
+        };
+
+        let new_width = if screen_width() > 1000.0 {
+            1000.0
+        } else {
+            screen_width()
+        };
+
+        if new_height == self.window_height && new_width == self.window_width {
+            return;
+        }
+
+        self.window_height = new_height;
+        self.window_width = new_width;
+        self.update_drawables();
+    }
+
+    pub fn handle_input(&mut self) {
+        let mut button_action = None;
+        for btn in &mut self.btns {
+            btn.handle_input();
+            if btn.is_pressed {
+                button_action = Some(btn.action);
+            }
+        }
+
+        if let Some(action) = button_action {
+            match action {
+                ButtonAction::Reset => self.reset(),
+                ButtonAction::Next => self.next_puzzle(),
+            }
+
+            return;
+        }
+
+        if is_key_released(KeyCode::D) {
+            self.debug = !self.debug;
+            return;
+        }
+
+        if is_key_released(KeyCode::Q) {
+            std::process::exit(0);
+        }
+
+        if is_mouse_button_released(MouseButton::Left) {
+            let current_state = self.state.clone();
+            let new_state = match current_state {
+                GameState::SelectSource(previous_target) => {
+                    self.handle_select_source(mouse_position(), previous_target)
+                }
+                GameState::SelectTarget(source) => {
+                    let next = self.handle_select_target(mouse_position(), source);
+                    if let GameState::SelectTarget(_) = next {
+                        self.reset_squares();
+                        GameState::SelectSource(None)
+                    } else {
+                        next
+                    }
+                }
+                GameState::GameOver(previous_target) => GameState::GameOver(previous_target),
+            };
+            self.state = new_state;
+            return;
+        }
+
+        if is_mouse_button_pressed(MouseButton::Left) {
+            let current_state = self.state.clone();
+            let new_state = match current_state {
+                GameState::SelectSource(previous_target) => {
+                    self.handle_select_source(mouse_position(), previous_target)
+                }
+                GameState::SelectTarget(source) => GameState::SelectTarget(source),
+                GameState::GameOver(previous_target) => GameState::GameOver(previous_target),
+            };
+
+            self.state = new_state;
+        }
+    }
+
+    fn draw_heading(&self) {
+        draw_text(
+            self.heading_text.as_str(),
+            self.heading_rect.x,
+            self.heading_rect.y,
+            self.heading_font_size,
+            BLACK,
+        );
+    }
+
+    fn draw_board(&self) {
+        let sprite_size = 0.8 * self.square_width;
+        let mut selected_square = None;
+        self.squares.iter().for_each(|square| {
+            let color = if square.is_source {
+                Color::from_rgba(152, 152, 152, 255)
+            } else if square.is_target {
+                Color::from_rgba(152, 129, 123, 255)
+            } else {
+                square.color
+            };
+
+            draw_rectangle(
+                square.rect.x,
+                square.rect.y,
+                square.rect.w,
+                square.rect.h,
+                color,
+            );
+
+            if let Some(p) = &self.board.cells[square.i][square.j] {
+                let offset = (square.rect.w - sprite_size) / 2.0;
+                let dtp = PieceTexture::for_piece(*p, sprite_size);
+                if !square.is_source {
+                    draw_texture_ex(
+                        &self.texture_res,
+                        square.rect.x + offset,
+                        square.rect.y + offset,
+                        WHITE,
+                        dtp,
+                    );
+                } else {
+                    selected_square = Some(square);
+                }
+            }
+        });
+
+        if let Some(selected_square) = selected_square {
+            if let Some(p) = self.board.cells[selected_square.i][selected_square.j] {
+                let dtp = PieceTexture::for_piece(p, sprite_size);
+                draw_texture_ex(
+                    &self.texture_res,
+                    mouse_position().0 - sprite_size / 2.0,
+                    mouse_position().1 - sprite_size / 2.0,
+                    WHITE,
+                    dtp,
+                );
+            }
+        }
+    }
+
+    fn draw_buttons(&self) {
+        for btn in &self.btns {
+            btn.draw();
+        }
+    }
+
+    fn draw_debug(&self) {
+        if self.debug {
+            let mut debug_lines = vec![];
+            let (mx, my) = mouse_position();
+            let hover_square = self.squares.iter().find(|s| {
+                let c = Circle::new(mx, my, 0.0);
+                if c.overlaps_rect(&s.rect) {
+                    return true;
+                }
+                return false;
+            });
+            debug_lines.push(format!("Game State: {}", self.state));
+            debug_lines.push(format!("Board State: {}", self.board.game_state));
+            if let Some(hover_square) = hover_square {
+                debug_lines.push(format!("Hover: [ {}, {} ]", hover_square.i, hover_square.j));
+            }
+            self.add_debug_info(debug_lines);
+
+            self.show_fps();
+        }
+    }
+
+    fn get(&mut self, i: usize, j: usize) -> &mut GameSquare {
+        &mut self.squares[i * self.num_squares + j]
+    }
+
+    fn update_drawables(&mut self) {
+        self.square_width = 0.15 * self.window_width;
+
+        let board_x = (self.window_width - (self.square_width * self.num_squares as f32)) / 2.0;
+        let board_y = (self.window_height - (self.square_width * self.num_squares as f32)) / 2.0;
+        let board_width = self.square_width * self.num_squares as f32;
+
+        self.heading_font_size = 0.07 * self.window_width;
+        let f = self.heading_font_size.floor() as u16;
+        let dims = measure_text(self.heading_text.as_str(), None, f, 1.0);
+        self.heading_rect = Rect::new(
+            board_x + (board_width - dims.width) / 2.0,
+            board_y / 2.0,
+            dims.width,
+            dims.height,
+        );
+
+        let dark = Color::from_rgba(83, 104, 120, 255);
+        let light = Color::from_rgba(190, 190, 190, 255);
+        let mut rects = Vec::new();
+        for i in 0..self.num_squares {
+            for j in 0..self.num_squares {
+                let x_eff = board_x + (i as f32 * self.square_width);
+                let y_eff = board_y + (j as f32 * self.square_width);
+                let rect = Rect::new(x_eff, y_eff, self.square_width, self.square_width);
+                let color = match (i + j) % 2 {
+                    1 => dark,
+                    _ => light,
+                };
+
+                rects.push(GameSquare {
+                    rect,
+                    color,
+                    i,
+                    j,
+                    is_source: false,
+                    is_target: false,
+                    is_previous_target: false,
+                });
+            }
+        }
+
+        self.squares = rects;
+
+        let btn_height = 0.1 * self.window_height;
+        let btn_displ = (self.window_height
+            - (self.num_squares as f32 * self.square_width + board_y)
+            - btn_height)
+            * 0.5;
+        let btn_y = self.num_squares as f32 * self.square_width + board_y + btn_displ;
+        let btn_w = self.num_squares as f32 * self.square_width * 0.5;
+        let reset_btn = Button::new(
+            "Reset",
+            board_x,
+            btn_y,
+            btn_w,
+            btn_height,
+            ButtonAction::Reset,
+        );
+        let mut next_btn = Button::new(
+            "Next",
+            board_x + btn_w,
+            btn_y,
+            btn_w,
+            btn_height,
+            ButtonAction::Next,
+        );
+
+        next_btn.is_active = false;
+        self.btns = vec![reset_btn, next_btn];
+    }
+
+    fn handle_select_source(
+        &mut self,
+        mouse_position: (f32, f32),
+        previous_target: Option<(usize, usize)>,
+    ) -> GameState {
+        self.reset_squares();
+        let (x, y) = mouse_position;
+        let mouse = Circle::new(x, y, 0.0);
+        let mut selected = None;
+        for square in &mut self.squares {
+            if mouse.overlaps_rect(&square.rect) {
+                if let Some(_) = self.board.cells[square.i][square.j] {
+                    selected = Some((square.i, square.j));
+                }
+            }
+        }
+
+        if let Some((i, j)) = selected {
+            self.get(i, j).is_source = true;
+            let mut target_squares = vec![];
+            for m in self.board.legal_moves.iter() {
+                if m.from.file == i && m.from.rank == j {
+                    target_squares.push((m.to.file, m.to.rank));
+                }
+            }
+
+            for (i, j) in target_squares {
+                self.get(i, j).is_target = true;
+            }
+
+            return GameState::SelectTarget(selected.unwrap());
+        }
+
+        if let Some((i, j)) = previous_target {
+            self.get(i, j).is_previous_target = true;
+        }
+
+        return GameState::SelectSource(None);
+    }
+
+    fn handle_select_target(
+        &mut self,
+        mouse_position: (f32, f32),
+        source: (usize, usize),
+    ) -> GameState {
+        let (x, y) = mouse_position;
+        let mouse = Circle::new(x, y, 0.0);
+
+        let mut selected = None;
+        for square in &mut self.squares {
+            if mouse.overlaps_rect(&square.rect) {
+                if let Some(_) = self.board.cells[square.i][square.j] {
+                    selected = Some((square.i, square.j));
+                }
+            }
+        }
+
+        let (s_x, s_y) = source;
+        let Some((x, y)) = selected else {
+            self.get(s_x, s_y).is_source = true;
+            return GameState::SelectTarget(source);
+        };
+
+        if x == s_x && y == s_y {
+            self.get(s_x, s_y).is_source = true;
+            return GameState::SelectTarget(source);
+        }
+
+        let mut is_legal = false;
+        if self.get(x, y).is_target {
+            is_legal = true;
+        }
+
+        if is_legal {
+            let m = self.board.legal_moves.iter().find(|m| {
+                m.from.file == s_x && m.from.rank == s_y && m.to.file == x && m.to.rank == y
+            });
+
+            let m = m.expect("legal move should be found");
+
+            self.board.make_move(m.clone());
+
+            if self.board.game_state == BoardState::Won || self.board.game_state == BoardState::Lost
+            {
+                self.reset_squares();
+                if self.board.game_state == BoardState::Won {
+                    for btn in &mut self.btns {
+                        if let ButtonAction::Next = btn.action {
+                            btn.is_active = true;
+                        }
+                    }
+                }
+
+                return GameState::GameOver((x, y));
+            }
+
+            self.reset_squares();
+            self.get(x, y).is_target = true;
+            return GameState::SelectSource(Some((x, y)));
+        }
+
+        self.reset_squares();
+        return GameState::SelectSource(None);
+    }
+
+    fn reset(&mut self) {
+        self.board = self.original_board.clone();
+        self.reset_squares();
+        for btn in &mut self.btns {
+            btn.reset();
+            if let ButtonAction::Next = btn.action {
+                btn.is_active = false;
+            }
+        }
+
+        self.state = GameState::SelectSource(None);
+    }
+
+    fn next_puzzle(&mut self) {
+        self.reset();
+        let generate = generator::generate(6, 100);
+        let board = generate.board().expect("No puzzle was generated");
+        self.original_board = board.clone();
+        self.board = board;
+    }
+
+    fn reset_squares(&mut self) {
+        for i in 0..self.num_squares {
+            for j in 0..self.num_squares {
+                self.get(i, j).is_source = false;
+                self.get(i, j).is_target = false;
+            }
+        }
+    }
+
+    fn add_debug_info(&self, lines: Vec<String>) {
+        let mut y = 20.0;
+        for line in lines {
+            draw_text(&line, 10.0, y, 20.0, BLACK);
+            y += 25.0;
+        }
+    }
+
+    fn show_fps(&self) {
+        let fps = get_fps();
+        draw_text(
+            &format!("FPS: {}", fps),
+            10.0,
+            screen_height() - 20.0,
+            20.0,
+            BLACK,
+        );
+    }
+}
+
+impl Display for GameState {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            GameState::SelectSource(Some(x)) => write!(f, "Select Source [ {}, {} ]", x.0, x.1),
+            GameState::SelectSource(None) => write!(f, "Select Source [ ]"),
+            GameState::SelectTarget(x) => write!(f, "Select Target [ {}, {} ]", x.0, x.1),
+            GameState::GameOver(x) => write!(f, "Game Over [ {}, {} ]", x.0, x.1),
+        }
+    }
+}