/*
Program: Bibliofile
Language: Rustc 1.71.0
ide: CLion
Operating system: Fedora 38/WSL
Purpose: TUI-based ereader and library manager for Linux terminal environments.
Last edited: 7/27/23
*/


mod html_module;

use epub::doc::EpubDoc; //library for navigating epubs
use std::*;
use std::path::Path;
use std::process::exit;
use tuikit::term::{Term, TermHeight};
use tuikit::prelude::*;

//this function will determine if Bibliofile has been opened before. If it has not, it will create a library folder under /opt/bibliofile.
fn library_exists(){


    //if /var/lib/bibliofile/library does not exist, create it.
    let mut library_exist_var = Path::exists("/var/lib/bibliofile/library".as_ref());
    println!("{}", library_exist_var);
    if library_exist_var == false{
        fs::create_dir_all("/var/lib/bibliofile/library").expect("Error...could not create library. If this is your first time running Bibliofile, try running with sudo.");
    }

}

//initial function. Reads the ebook passed by argument.
//TODO: add visual library to pull up ebooks.
fn main() {
    library_exists();
    if env::args().len() == 1 {
        println!("you need to enter a book. Closing program.");
    }
    else {
        let args: Vec<String> = env::args().collect();
        let filename = &args[1];

        epub_func(filename);
    }
}


//parses epub files
fn epub_func(epub_file: &str){

    let doc = EpubDoc::new(&epub_file);
    assert!(doc.is_ok());
    let mut doc = doc.unwrap();



    let term: Term<()> = Term::with_height(TermHeight::Percent(90)).unwrap();
    let _ = term.clear();








    let mut page_num = 1;

    //If letter q pressed, closes program.
    while let Ok(ev) = term.poll_event() {
        let _ = term.clear();
        match ev {
            Event::Key(Key::ESC) | Event::Key(Key::Char('q')) => break,
            _ => {}
        }



        doc.set_current_page(page_num);

        let content = doc.get_current_str();
        let str_content = content.unwrap();
        let text = html_module::main(str_content.0);
        let _ = term.print(0, 0, &*text);
        let _ = term.present();
    }
}