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extern crate json;
extern crate rand;
use std::env;
use std::path::Path;
use std::path::PathBuf;
use std::io::prelude::*;
use std::fs::File;
use std::fmt;
use rand::distributions::{IndependentSample, Range};
const COMMAND_FILE: &'static str = "command.txt";
const PLACE_FILE: &'static str = "place.txt";
const STATE_FILE: &'static str = "state.json";
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
enum Orientation {
North,
East,
South,
West,
}
impl fmt::Display for Orientation {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str(
match self {
&Orientation::North => "North",
&Orientation::East => "East",
&Orientation::South => "South",
&Orientation::West => "West"
}
)
}
}
#[derive(Clone, PartialEq, Eq, Debug)]
enum Action {
PlaceShips(Vec<(String, u32, u32, Orientation)>),
Shoot(u32, u32)
}
impl fmt::Display for Action {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&Action::Shoot(x, y) => writeln!(f, "1,{},{}", x, y),
&Action::PlaceShips(ref ships) => ships.iter().map(|&(ref ship_type, x, y, orientation)| {
writeln!(f, "{} {} {} {}", ship_type, x, y, orientation)
}).fold(Ok(()), |acc, next| acc.and(next))
}
}
}
fn main() {
let working_dir = env::args()
.nth(2)
.map(|pwd| PathBuf::from(pwd))
.expect("Requires game state folder to be passed as the second parameter");
// The state file is read here. Chances are, you'll want to read
// more values out of it than the sample bot currently does.
let state = read_file(&working_dir).expect("Failed to read state.json");
let is_place_phase = state["Phase"] == 1;
let map_dimension = state["MapDimension"].as_u32().expect("Could not read map dimension from the state");
let action = if is_place_phase {
place_ships()
}
else {
shoot_randomly(map_dimension)
};
write_action(&working_dir, is_place_phase, action).expect("Failed to write action to file");
}
fn read_file(working_dir: &Path) -> Result<json::JsonValue, String> {
let state_path = working_dir.join(STATE_FILE);
let mut file = File::open(state_path.as_path()).map_err(|e| e.to_string())?;
let mut content = String::new();
file.read_to_string(&mut content).map_err(|e| e.to_string())?;
json::parse(content.as_ref()).map_err(|e| e.to_string())
}
fn place_ships() -> Action {
let ships = vec!(
(String::from("Battleship"), 1, 0, Orientation::North),
(String::from("Carrier"), 3, 1, Orientation::East),
(String::from("Cruiser"), 4, 2, Orientation::North),
(String::from("Destroyer"), 7, 3, Orientation::North),
(String::from("Submarine"), 1, 8, Orientation::East)
);
Action::PlaceShips(ships)
}
fn shoot_randomly(map_dimension: u32) -> Action {
let mut rng = rand::thread_rng();
let between = Range::new(0, map_dimension);
let x = between.ind_sample(&mut rng);
let y = between.ind_sample(&mut rng);
Action::Shoot(x, y)
}
fn write_action(working_dir: &Path, is_place_phase: bool, action: Action) -> Result<(), String> {
let filename = if is_place_phase {
PLACE_FILE
}
else {
COMMAND_FILE
};
let full_filename = working_dir.join(filename);
let mut file = File::create(full_filename.as_path()).map_err(|e| e.to_string())?;
writeln!(file, "{}", action).map_err(|e| e.to_string())?;
Ok(())
}
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