amazeing 0.9.0

Amazeing is a maze generator/solver application with simulation/visualization.
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use crate::maze::{Maze, MazeData, NodeFactory, UnitShape};
use std::fs;
use std::fs::OpenOptions;
use std::io::Write;
use std::path::Path;
use std::str::FromStr;

pub(crate) fn dump_maze_to_file(path: &Path, maze: &Maze) {
    if fs::exists(path).unwrap_or(false) {
        fs::remove_file(path).unwrap();
    }

    let mut file = OpenOptions::new()
        .write(true)
        .create(true)
        .truncate(true)
        .open(path)
        .expect("Could not open file");

    writeln!(file, "{}", maze.unit_shape).expect("Could not write to file");

    let node_factory = NodeFactory::new(maze.rows(), maze.cols());

    for r in 0..maze.rows() {
        for c in 0..maze.cols() {
            if let Some(node) = node_factory.at(r, c) {
                write!(file, "{: >2}", maze[node]).expect("Could not write to file");
                if c < maze.cols() - 1 {
                    write!(file, " ").expect("Could not write to file");
                }
            }
        }
        if r < maze.rows() - 1 {
            writeln!(file).expect("Could not write to file");
        }
    }
}

pub(crate) fn load_maze_from_file(path: &Path) -> Maze {
    if !fs::exists(path).unwrap_or(false) {
        panic!("Maze file {} does not exist", path.display());
    }

    let file_data = fs::read_to_string(path)
        .unwrap_or_else(|e| panic!("Could not read maze file {}: {}", path.display(), e));

    let mut lines: Vec<&str> = file_data.lines().collect();

    let unit_shape = UnitShape::from_str(lines.remove(0))
        .unwrap_or_else(|e| panic!("{}", e));

    let data: MazeData = lines
        .iter()
        .filter(|line| !line.trim().is_empty())
        .map(|line| {
            line.split_whitespace()
                .map(|token| token.parse::<i8>().unwrap_or_else(|e| panic!("Invalid cell value '{}': {}", token, e)))
                .collect()
        })
        .collect();

    Maze::from(unit_shape, data)
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::maze::{Maze, NodeFactory, OPEN, UnitShape, VOID};

    fn temp_path(name: &str) -> std::path::PathBuf {
        let ts = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .unwrap()
            .as_nanos();
        std::env::temp_dir().join(format!("{}_{}.maze", name, ts))
    }

    #[test]
    fn dump_and_load_roundtrip_preserves_maze() {
        let mut maze = Maze::new(UnitShape::Square, 2, 3, VOID);
        let f = NodeFactory::new(2, 3);
        maze[f.at(0, 0).unwrap()] = OPEN;
        maze[f.at(1, 2).unwrap()] = OPEN;

        let path = temp_path("amazeing_roundtrip");
        dump_maze_to_file(&path, &maze);
        let loaded = load_maze_from_file(&path);

        assert_eq!(loaded.unit_shape, maze.unit_shape);
        assert_eq!(loaded.data, maze.data);

        let _ = fs::remove_file(path);
    }

    #[test]
    #[should_panic]
    fn load_panics_for_missing_file() {
        let path = temp_path("amazeing_missing");
        load_maze_from_file(&path);
    }
}