/*
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};
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());

    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::new().unwrap();

    let _ = term.print(1, 0, "Use the left and right button to turn the page.\nUp and down scrolls. Press escape or q to quit.");

    let mut page_num = 1;





    //If letter q pressed, closes program.
    while let Ok(ev) = term.poll_event() {
        let (width, height) = term.term_size().unwrap();

        match ev {
            Event::Key(Key::ESC) | Event::Key(Key::Char('q')) => break,
            Event::Key(Key::Right) => page_num = page_num + 1,
            Event::Key(Key::Left) => page_num = page_num - 1,
            _ => {}
        }
        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(2, 0, &text);
        let _ = term.present();

    }
}