pub mod qif;

use clap::Parser;
use qif::*;
use std::{
    error::Error,
    fs::File,
    io::{prelude::*, *},
    path::PathBuf,
    result::Result,
};

/// Qif file preprocessor to decrease duplication when importing to gnucash
#[derive(Parser, Debug)]
#[structopt(
    name = "Qif Parser",
    version, about, long_about = None
)]
struct CliArgs {
    /// Files to preprocess
    #[arg(value_hint = clap::ValueHint::FilePath)]
    files: Vec<PathBuf>,
}

fn main() -> Result<(), Box<dyn Error>> {
    let args = CliArgs::parse();

    for filepath in &args.files {
        let file = File::open(filepath)?;
        let file_reader = BufReader::new(file);
        let mut lines = file_reader.lines();

        if let Some(header_line) = lines.next() {
            let mut qif_file = QifFile::new(header_line?);
            let mut next_entry = Vec::new();

            for line_result in lines {
                let line = line_result?;
                if line == String::from("^") {
                    let new_qif_entry = QifEntry::new(&next_entry)?;
                    qif_file.push(new_qif_entry);
                    next_entry.clear();
                } else {
                    next_entry.push(line);
                }
            }

            let mut file = File::create(filepath)?;
            writeln!(file, "{}", qif_file)?;
        } else {
            println!("{} was empty", filepath.display());
        }
    }
    println!("Processed {} files", args.files.len());
    Ok(())
}