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// -*- coding: utf-8 -*-
//
// Copyright 2021 Michael Buesch <m@bues.ch>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
use anyhow as ah;
use crate::board::{BOARD_WIDTH, BOARD_HEIGHT, coord_is_on_board};
use crate::coord::{Coord, CoordAxis};
use crate::coord;
use super::{MoveState, WinState};
const X_NAMES: [char; BOARD_WIDTH as usize] = ['a', 'b', 'c', 'd', 'e'];
const Y_NAMES: [char; BOARD_HEIGHT as usize] = ['7', '6', '5', '4', '3', '2', '1'];
fn coord_to_recorder_pos(pos: &Coord) -> String {
format!("{}{}", X_NAMES[pos.x as usize], Y_NAMES[pos.y as usize])
}
fn recorder_pos_to_coord(chars: &[char]) -> ah::Result<Coord> {
if chars.len() != 2 {
return Err(ah::format_err!("Recorder position: Invalid size ({} != 2).",
chars.len()));
}
let x_char: char = chars[0].to_lowercase().next().unwrap();
let x = match X_NAMES.iter().position(|&x| x == x_char) {
Some(x) => x,
None => return Err(ah::format_err!("Recorder position: Invalid X coordinate: {}",
chars[0])),
};
let y_char: char = chars[1].to_lowercase().next().unwrap();
let y = match Y_NAMES.iter().position(|&y| y == y_char) {
Some(y) => y,
None => return Err(ah::format_err!("Recorder position: Invalid Y coordinate: {}",
chars[1])),
};
let pos = coord!(x as CoordAxis, y as CoordAxis);
if !coord_is_on_board(pos) {
return Err(ah::format_err!("Recorder position: Position {}{} is not on the board.",
chars[0], chars[1]));
}
Ok(pos)
}
/// One recorded game move.
pub struct RecordedMove {
/// The token that has been moved from the given position.
pub move_state: MoveState,
/// The target position of the move.
pub to_pos: Coord,
/// True, if a token has been captured during this move.
pub captured: bool,
/// The game-win state after this move.
pub win_state: WinState,
}
impl RecordedMove {
/// Parse a move record line string.
fn parse_log_line(line: &str) -> ah::Result<RecordedMove> {
let chars: Vec<char> = line.chars().collect();
let mut offset = 0;
// Moving token ID.
if chars[offset..].len() < 1 {
return Err(ah::format_err!("Recorder log: No token ID."));
}
let move_state_type = match chars[offset] {
'W' | 'w' => MoveState::Wolf,
'S' | 's' => MoveState::Sheep,
other => {
return Err(ah::format_err!("Recorder log: Invalid token ID: {}", other));
},
};
offset += 1;
// From-position.
if chars[offset..].len() < 2 {
return Err(ah::format_err!("Recorder log: No from-position."));
}
let from_pos = recorder_pos_to_coord(&chars[offset..offset+2])?;
let move_state = move_state_type(from_pos);
offset += 2;
// Move type.
if chars[offset..].len() < 1 {
return Err(ah::format_err!("Recorder log: No move type."));
}
let (win_state, captured) = match chars[offset] {
'-' => (WinState::Undecided, false),
'X' | 'x' => (WinState::Undecided, true),
'#' => {
match move_state {
MoveState::Wolf(_) => (WinState::Wolf, true),
MoveState::Sheep(_) => (WinState::Sheep, false),
_ => return Err(ah::format_err!("Recorder log: Internal error")),
}
},
other => {
return Err(ah::format_err!("Recorder log: Invalid move type: {}", other));
},
};
offset += 1;
// To-position.
if chars[offset..].len() < 2 {
return Err(ah::format_err!("Recorder log: No to-position."));
}
let to_pos = recorder_pos_to_coord(&chars[offset..offset+2])?;
Ok(RecordedMove {
move_state,
to_pos,
captured,
win_state,
})
}
}
impl std::fmt::Display for RecordedMove {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let (from_type, from_pos) = match self.move_state {
MoveState::NoMove => return write!(f, ""),
MoveState::Wolf(from_pos) => ("W", from_pos),
MoveState::Sheep(from_pos) => ("S", from_pos),
};
let move_type = match self.win_state {
WinState::Undecided => if self.captured { "x" } else { "-" },
WinState::Wolf | WinState::Sheep => "#",
};
write!(f, "{}{}{}{}",
from_type,
&coord_to_recorder_pos(&from_pos),
move_type,
&coord_to_recorder_pos(&self.to_pos))
}
}
pub struct Recorder {
move_log: Vec<String>,
}
impl Recorder {
pub fn new() -> Recorder {
Recorder {
move_log: vec![],
}
}
pub fn reset(&mut self) {
self.move_log.clear();
}
/// Add a move to the move record.
pub fn record_move(&mut self, recorded_move: &RecordedMove) {
self.move_log.push(recorded_move.to_string());
}
pub fn get_moves(&self) -> &Vec<String> {
&self.move_log
}
pub fn get_moves_as_text(&self) -> String {
self.get_moves().join("\n")
}
pub fn parse_text(&mut self, text: &str) -> ah::Result<()> {
self.reset();
for line in text.split("\n").map(|l| l.trim()) {
if !line.is_empty() {
let mov = RecordedMove::parse_log_line(line)?;
self.move_log.push(mov.to_string());
}
}
Ok(())
}
}
// vim: ts=4 sw=4 expandtab
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