use anyhow::Result;
use std::path::{Path, PathBuf};
use structopt::StructOpt;

use subplot::Document;

#[derive(Debug, StructOpt)]
#[structopt(name = "sp-meta", about = "Show Subplot document metadata.")]
struct Opt {
    // Input filename.
    #[structopt(parse(from_os_str))]
    filename: PathBuf,
}

fn main() -> Result<()> {
    let opt = Opt::from_args();
    let basedir = subplot::get_basedir_from(&opt.filename)?;
    let mut doc = Document::from_file(&basedir, &opt.filename)?;

    for filename in doc.sources() {
        println!("source: {}", filename.display());
    }

    println!("title: {}", doc.meta().title());
    println!("bindings: {}", filename(doc.meta().bindings_filename()));
    println!("functions: {}", filename(doc.meta().functions_filename()));
    for bib in doc.meta().bibliographies().iter() {
        println!("bibliography: {}", filename(Some(bib)));
    }

    for scen in doc.scenarios()? {
        println!("scenario {}", scen.title());
    }
    Ok(())
}

fn filename(name: Option<&Path>) -> String {
    let path = match name {
        None => return "".to_string(),
        Some(x) => x,
    };
    match path.to_str() {
        None => "non-UTF8 filename".to_string(),
        Some(x) => x.to_string(),
    }
}