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extern crate std;
use board::{GoBoard, Team};
use board::Tile;
use ia;
pub type HeuristicFn = fn(board: &GoBoard, team: Team) -> i32;
const WIN: i32 = ia::INFINITE - 100;
fn check_index(board: &GoBoard, x: i32, y: i32) -> bool {
if x < 0 || y < 0 {
return false;
}
if x >= board.get_size() as i32 || y >= board.get_size() as i32 {
return false;
}
true
}
fn nb_in_line(board: &GoBoard,
x: i32, y: i32,
dx: i32, dy: i32,
team: Tile)
-> i32 {
let mut ttl = 1;
let mut free_extrems = 0;
let mut blank = 0;
let mut nx = x + dx;
let mut ny = y + dy;
while check_index(board, nx, ny) &&
board.get((nx as usize, ny as usize)) == team {
nx += dx;
ny += dy;
ttl += 1;
}
if check_index(board, nx, ny) &&
board.get((nx as usize, ny as usize)) != team.ennemy() {
free_extrems += 1;
while check_index(board, nx, ny) &&
board.get((nx as usize, ny as usize)) == Tile::FREE &&
blank + ttl < 6 {
nx += dx;
ny += dy;
blank += 1;
}
}
nx = x - dx;
ny = y - dy;
while check_index(board, nx, ny) &&
board.get((nx as usize, ny as usize)) == team {
nx -= dx;
ny -= dy;
ttl += 1;
}
if check_index(board, nx, ny) &&
board.get((nx as usize, ny as usize)) != team.ennemy() {
free_extrems += 1;
while check_index(board, nx, ny) &&
board.get((nx as usize, ny as usize)) == Tile::FREE &&
blank + ttl < 6 {
nx -= dx;
ny -= dy;
blank += 1;
}
}
if blank + ttl < 5 {
0
} else if ttl >= 5 {
WIN + (ttl - 5) * free_extrems
} else if free_extrems == 2 && ttl >= 4 {
WIN - 1
} else if ttl > 0 {
ttl * free_extrems
} else {
0
}
}
fn tile_value(board: &GoBoard,
x: i32,
y: i32,
team: Tile)
-> i32 {
let mut ttl_tile = 0;
let score_tile = nb_in_line(board, x, y, 1, 1, team);
if score_tile >= WIN - 10 {
return WIN;
}
ttl_tile += score_tile;
let score_tile = nb_in_line(board, x, y, 0, 1, team);
if score_tile >= WIN - 10 {
return WIN;
}
ttl_tile += score_tile;
let score_tile = nb_in_line(board, x, y, 1, 0, team);
if score_tile >= WIN - 10 {
return WIN;
}
ttl_tile += score_tile;
let score_tile = nb_in_line(board, x, y, 1, -1, team);
if score_tile >= WIN - 10 {
return WIN;
}
ttl_tile += score_tile;
ttl_tile
}
pub fn heuristic(board: &GoBoard, team: Team) -> i32 {
let mut player_score = team.captured() as i32 * team.captured() as i32;
let mut enemy_score = 0;
for x in 0..board.get_size() {
for y in 0..board.get_size() {
match board.get((x, y)) {
Tile::FREE => {},
t if team.get_tile() == t => {
let tile_score = tile_value(board, x as i32, y as i32, team.get_tile());
if tile_score >= WIN - 10 {
return tile_score;
} else {
player_score += tile_score;
}
},
t if team.get_ennemy_tile() == t => {
let tile_score = tile_value(board, x as i32, y as i32, team.get_ennemy_tile());
if tile_score >= WIN - 10 {
return tile_score;
}
let tile_score = tile_value(board, x as i32, y as i32, team.get_ennemy_tile());
if tile_score == WIN {
return ia::NINFINITE;
} else {
enemy_score += tile_score;
}
},
_ => {}
}
}
}
player_score - enemy_score
}
#[cfg(test)]
fn test_one(s: &str) {
let board = GoBoard::parse_with_size(&s.to_string());
let (team_b, team_w) = Team::new_teams();
println!("Test\n{}", board);
let white = heuristic(&board, team_w);
let black = heuristic(&board, team_b);
println!("Is white {} > black {}", white, black);
assert!(white >black);
}