// Copyright (C) 2020 "Maxime “pep” Buquet <pep@bouah.net>"
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published by the
// Free Software Foundation, either version 3 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 Affero General Public License
// for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

use std::convert::TryFrom;
use std::fs;
use std::path::PathBuf;

use pkstrings::PKString;
use structopt::StructOpt;

#[derive(Debug, StructOpt)]
#[structopt(name = "strings", about = "Display printable strings in [file(s)]")]
struct Opt {
    #[structopt(parse(from_os_str), long, short)]
    files: Vec<PathBuf>,
}

fn print_buffer(offset: usize, buffer: &Vec<String>) {
    let mut res: String = String::new();
    for buf in buffer {
        res.push_str(buf.as_str());
    }
    println!("{}: {}", format!("{:#7x}", offset), res);
}

fn read_data(data: Vec<u8>) {
    let mut buffer: Vec<String> = Vec::new();

    for (offset, ord) in data.iter().enumerate() {
        // Read current chr
        if let Ok(pkstr) = PKString::try_from(&[*ord][..]) {
            buffer.push(String::from(pkstr));
        } else {
            if buffer.len() >= 4 {
                print_buffer(offset, &buffer);
            }
            buffer.clear();
        }
    }
}

fn main() {
    let opt = Opt::from_args();

    for file in opt.files {
        let data: Vec<u8> = fs::read(file).unwrap();
        read_data(data)
    }
}