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use crate::display::{self, Viewport};
use crate::entities::Character;
use crate::entities::Entity;
use crate::messages::message;
use crate::settings::Settings;
use crate::types::command::Command;
use crate::types::entity_map::EntityID;
use crate::types::entity_map::EntityMap;
use crate::types::Ticks;
use crate::types::{
BoundingBox, Collision, Dimensions, Position, Positioned, PositionedMut,
};
use rand::rngs::SmallRng;
use rand::SeedableRng;
use std::io::{self, StdinLock, StdoutLock, Write};
use termion::input::Keys;
use termion::input::TermRead;
use termion::raw::RawTerminal;
type Stdout<'a> = RawTerminal<StdoutLock<'a>>;
type Rng = SmallRng;
type AnEntity<'a> = Box<dyn Entity>;
impl<'a> Positioned for AnEntity<'a> {
fn position(&self) -> Position {
(**self).position()
}
}
impl<'a> PositionedMut for AnEntity<'a> {
fn set_position(&mut self, pos: Position) {
(**self).set_position(pos)
}
}
/// The full state of a running Game
pub struct Game<'a> {
settings: Settings,
viewport: Viewport<Stdout<'a>>,
/// An iterator on keypresses from the user
keys: Keys<StdinLock<'a>>,
/// The map of all the entities in the game
entities: EntityMap<AnEntity<'a>>,
/// The entity ID of the player character
character_entity_id: EntityID,
/// The messages that have been said to the user, in forward time order
messages: Vec<String>,
/// The index of the currently-displayed message. Used to track the index of
/// the currently displayed message when handling PreviousMessage commands
message_idx: usize,
/// A global random number generator for the game
rng: Rng,
}
impl<'a> Game<'a> {
pub fn new(
settings: Settings,
stdout: RawTerminal<StdoutLock<'a>>,
stdin: StdinLock<'a>,
w: u16,
h: u16,
) -> Game<'a> {
let rng = match settings.seed {
Some(seed) => SmallRng::seed_from_u64(seed),
None => SmallRng::from_entropy(),
};
let mut entities: EntityMap<AnEntity<'a>> = EntityMap::new();
Game {
settings,
rng,
message_idx: 0,
viewport: Viewport::new(
BoundingBox::at_origin(Dimensions { w, h }),
BoundingBox::at_origin(Dimensions { w: w - 2, h: h - 2 }),
stdout,
),
keys: stdin.keys(),
character_entity_id: entities.insert(Box::new(Character::new())),
messages: Vec::new(),
entities,
}
}
/// Returns a collision, if any, at the given Position in the game
fn collision_at(&self, pos: Position) -> Option<Collision> {
if !pos.within(self.viewport.inner) {
Some(Collision::Stop)
} else {
None
}
}
fn character(&self) -> &Character {
debug!(
"ents: {:?} cid: {:?}",
self.entities.ids().map(|id| *id).collect::<Vec<u32>>(),
self.character_entity_id
);
(*self.entities.get(self.character_entity_id).unwrap())
.downcast_ref()
.unwrap()
}
/// Draw all the game entities to the screen
fn draw_entities(&mut self) -> io::Result<()> {
for entity in self.entities.entities() {
self.viewport.draw(entity)?;
}
Ok(())
}
/// Step the game forward the given number of ticks
fn tick(&mut self, ticks: Ticks) {}
/// Get a message from the global map based on the rng in this game
fn message(&mut self, name: &str) -> &'static str {
message(name, &mut self.rng)
}
/// Say a message to the user
fn say(&mut self, message_name: &str) -> io::Result<()> {
let message = self.message(message_name);
self.messages.push(message.to_string());
self.message_idx = self.messages.len() - 1;
self.viewport.write_message(message)
}
fn previous_message(&mut self) -> io::Result<()> {
if self.message_idx == 0 {
return Ok(());
}
self.message_idx -= 1;
let message = &self.messages[self.message_idx];
self.viewport.write_message(message)
}
/// Run the game
pub fn run(mut self) -> io::Result<()> {
info!("Running game");
self.viewport.init()?;
self.draw_entities()?;
self.say("global.welcome")?;
self.flush()?;
loop {
let mut old_position = None;
use Command::*;
match Command::from_key(self.keys.next().unwrap().unwrap()) {
Some(Quit) => {
info!("Quitting game due to user request");
break;
}
Some(Move(direction)) => {
use Collision::*;
let new_pos = self.character().position + direction;
match self.collision_at(new_pos) {
None => {
old_position = Some(self.character().position);
self.entities.update_position(
self.character_entity_id,
new_pos,
);
}
Some(Combat) => unimplemented!(),
Some(Stop) => (),
}
}
Some(PreviousMessage) => self.previous_message()?,
None => (),
}
match old_position {
Some(old_pos) => {
self.tick(self.character().speed().tiles_to_ticks(
(old_pos - self.character().position).as_tiles(),
));
self.viewport.clear(old_pos)?;
self.viewport.draw(
// TODO this clone feels unnecessary.
&self.character().clone(),
)?;
}
None => (),
}
self.flush()?;
debug!("{:?}", self.character());
}
Ok(())
}
}
impl<'a> Drop for Game<'a> {
fn drop(&mut self) {
display::clear(self).unwrap_or(());
}
}
impl<'a> Write for Game<'a> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.viewport.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
self.viewport.flush()
}
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
self.viewport.write_all(buf)
}
}
impl<'a> Positioned for Game<'a> {
fn position(&self) -> Position {
Position { x: 0, y: 0 }
}
}
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