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use crate::command::Command;
use crate::consts::*;
pub enum GameStatus {
Continue,
PlayerOneWon,
PlayerTwoWon,
Draw, // Until I add score I guess
}
pub struct GameState {
status: GameStatus,
players: [Player; 2],
obstacles: Vec<Position>,
powerup_oils: Vec<Position>,
powerup_boosts: Vec<Position>,
finish_lines: Vec<Position>,
}
pub struct Player {
position: Position,
next_position: Position,
speed: usize,
boost_remaining: usize,
oils: usize,
boosts: usize,
finished: bool,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Position {
x: usize,
y: usize,
}
impl GameState {
pub fn update(&mut self, commands: [Command; 2]) {
self.do_command(0, &commands[0]);
self.do_command(1, &commands[1]);
self.update_player_collisions();
self.update_player_travel();
self.status = if self.players[0].finished && self.players[1].finished {
if self.players[0].speed > self.players[1].speed {
GameStatus::PlayerOneWon
} else if self.players[0].speed < self.players[1].speed {
GameStatus::PlayerTwoWon
} else {
GameStatus::Draw
}
} else if self.players[0].finished {
GameStatus::PlayerOneWon
} else if self.players[1].finished {
GameStatus::PlayerTwoWon
} else {
GameStatus::Continue
};
}
fn do_command(&mut self, player_index: usize, command: &Command) {
use Command::*;
// TODO: Command validation assertions
match command {
Nothing => {}
Accelerate => self.players[player_index].accelerate(),
Decelerate => self.players[player_index].decelerate(),
TurnLeft => self.players[player_index].turn_left(),
TurnRight => self.players[player_index].turn_right(),
UseBoost => self.players[player_index].boost(),
UseOil => {
self.players[player_index].oils -= 1;
let player_position = self.players[player_index].position;
self.obstacles.push(Position {
x: player_position.x - 1,
y: player_position.y,
});
}
}
self.players[player_index].set_next_position_x();
}
fn update_player_collisions(&mut self) {
let same_lanes_before = self.players[0].position.y == self.players[1].position.y;
let same_lanes_after = self.players[0].next_position.y == self.players[1].next_position.y;
let first_passing_second = self.players[0].position.x < self.players[1].position.x
&& self.players[0].next_position.x >= self.players[1].next_position.x;
let second_passing_first = self.players[1].position.x < self.players[0].position.x
&& self.players[1].next_position.x >= self.players[0].next_position.x;
let same_x_after = self.players[0].next_position.x == self.players[1].next_position.x;
if same_lanes_before && same_lanes_after && first_passing_second {
self.players[0].next_position.x = self.players[1].next_position.x - 1;
} else if same_lanes_before && same_lanes_after && second_passing_first {
self.players[1].next_position.x = self.players[0].next_position.x - 1;
} else if same_lanes_after && same_x_after {
self.players[0].bonked_while_changing_lanes();
self.players[1].bonked_while_changing_lanes();
}
}
fn update_player_travel(&mut self) {
for player in &mut self.players {
player.move_along(
&self.obstacles,
&self.powerup_oils,
&self.powerup_boosts,
&self.finish_lines,
);
}
}
}
impl Player {
fn accelerate(&mut self) {
self.speed = match self.speed {
i if i < SPEED_1 => SPEED_1,
i if i < SPEED_2 => SPEED_2,
i if i < SPEED_3 => SPEED_3,
_ => SPEED_4,
};
}
fn decelerate(&mut self) {
self.speed = match self.speed {
i if i <= SPEED_1 => SPEED_0,
i if i <= SPEED_2 => SPEED_1,
i if i <= SPEED_3 => SPEED_2,
i if i <= SPEED_4 => SPEED_3,
_ => SPEED_4,
};
self.boost_remaining = 0;
}
fn decelerate_from_obstacle(&mut self) {
self.speed = match self.speed {
i if i <= SPEED_2 => SPEED_1,
i if i <= SPEED_3 => SPEED_2,
i if i <= SPEED_4 => SPEED_3,
_ => SPEED_4,
};
self.boost_remaining = 0;
}
fn turn_left(&mut self) {
self.next_position.y = self.position.y - 1;
}
fn turn_right(&mut self) {
self.next_position.y = self.position.y + 1;
}
fn boost(&mut self) {
self.speed = SPEED_BOOST;
self.boost_remaining = BOOST_DURATION;
self.boosts -= 1;
}
fn tick_boost(&mut self) {
self.boost_remaining = self.boost_remaining.saturating_sub(1);
if self.boost_remaining == 0 && self.speed == SPEED_BOOST {
self.speed = SPEED_4;
}
}
fn set_next_position_x(&mut self) {
if self.position.y == self.next_position.y {
self.next_position.x = self.position.x + self.speed;
} else {
self.next_position.x = self.position.x + self.speed - 1;
}
}
fn bonked_while_changing_lanes(&mut self) {
self.next_position.y = self.position.y;
self.next_position.x = self.position.x + self.speed - 1;
}
fn move_along(
&mut self,
obstacles: &[Position],
powerup_oils: &[Position],
powerup_boosts: &[Position],
finish_lines: &[Position],
) {
let start_x = if self.position.y == self.next_position.y {
self.position.x + 1
} else {
self.position.x
};
for x in start_x..=self.next_position.x {
let position = Position {
x,
y: self.next_position.y,
};
if obstacles.contains(&position) {
self.decelerate_from_obstacle();
}
if powerup_oils.contains(&position) {
self.oils += 1;
}
if powerup_boosts.contains(&position) {
self.boosts += 1;
}
if finish_lines.contains(&position) {
self.finished = true;
}
}
self.position = self.next_position;
}
}
|
