pub mod chapter;
pub mod project;
pub mod section;

use std::{
    env,
    ffi::OsString,
    fs::read_dir,
    io::{self, ErrorKind},
    path::PathBuf,
};

const SECTION: &'static str = r#"%! TEX root = ../../../main.tex
% LTeX: language=de-DE

\lesson{REPLACMENT_SECTION_TITLE}{DATE}{}
Dies ist etwas Text
"#;

const CHAPTER: &'static str = r#"%! TEX root = ../main.tex
% LTeX: language=de-DE

\chapter{REPLACEMENT_CHAPTER}
"#;

const TITLE_FILE: &'static str = r#"% LTeX: language=de-DE

\maketitle
\tableofcontents
\vspace*{\fill}
\makeatletter
Copyright \textcopyright{} \@authors{} \@years{}\\
\ \\
Dieses Werk ist lizenziert unter den Bedingungen der CC BY-SA 4.0.
Der Lizenztext ist online unter \url{http://creativecommons.org/licenses/by-sa/4.0/legalcode} abrufbar.
\makeatother
\clearpage
"#;

const MAIN_FILE: &'static str = r#"%\documentclass[a4paper, 12pt, nosolutions]{report}
\documentclass[a4paper, 12pt]{report}
% LTeX: language=de-DE
\input{headers/preamble.tex}
\input{headers/preamble_local.tex}


\title{\textbf{Titel}}
\author{Name\thanks{Beispiel}}
\authors{Name}
\years{2022 - 2023}
\date{\DTMDate{2002-12-4}}

\includeonly{content/REPLACEMENT_CHAPTER/chapter_01}

\begin{document}
    \input{content/static/title}

    \include{content/REPLACEMENT_CHAPTER/chapter_01}
    % NEXT_CHAPTER

    \printbibliography\relax
\end{document}
"#;



pub fn get_project_root() -> io::Result<PathBuf> {
    let path = env::current_dir()?;
    let mut path_ancestors = path.as_path().ancestors();

    while let Some(path_segment) = path_ancestors.next() {
        if read_dir(path_segment)?.into_iter().any(|path_segment| {
            path_segment
                .expect("The read_dir shouldn't error out here")
                .file_name()
                == OsString::from("lpm.toml")
        }) {
            return Ok(PathBuf::from(path_segment));
        }
    }
    Err(io::Error::new(
        ErrorKind::NotFound,
        "Ran out of places to find lpm.toml",
    ))
}

pub fn get_all_chapters() -> io::Result<Vec<String>> {
    let path = get_project_root()?;
    let output = read_dir(path.join("content"))?
        .map(|path| {
            path.expect("The values sholud be fine")
                .file_name()
                .to_str()
                .expect("all names should be valid utf-8")
                .to_owned()
        })
        .collect();
    Ok(output)
}