use std::env;
use std::fs;
use std::io::{self, Read};

use bsl_parser::parse_module;

fn main() {
    let args: Vec<String> = env::args().collect();
    let source_path = args.get(1).map(String::as_str).unwrap_or("-");
    let source = match args.get(1) {
        Some(path) => fs::read_to_string(path).unwrap_or_else(|error| {
            eprintln!("failed to read {path}: {error}");
            std::process::exit(2);
        }),
        None => {
            let mut buffer = String::new();
            io::stdin()
                .read_to_string(&mut buffer)
                .unwrap_or_else(|error| {
                    eprintln!("failed to read stdin: {error}");
                    std::process::exit(2);
                });
            buffer
        }
    };

    let unit = parse_module(source_path, &source);
    serde_json::to_writer_pretty(io::stdout(), &unit).unwrap_or_else(|error| {
        eprintln!("failed to serialize parse result: {error}");
        std::process::exit(2);
    });
    println!();
}