use std::{fs::File, io::{BufRead, BufReader, Lines, Read}, path::{Path, PathBuf}, str::FromStr};

use crate::error::AdventError;

pub fn read_into_vec<T:FromStr>(file_path : &Path) -> Result<Vec<T>, AdventError> where AdventError: From<<T as FromStr>::Err> {
    let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    path.push(file_path);
    let file = File::open(path).expect("no such file");
    let buf = BufReader::new(file);
    buf.lines().map(|line| T::from_str(line?.as_str()).map_err(Into::into)).collect::<Result<Vec<T>, AdventError>>()
}

pub fn _read_into<T:FromStr>(file_path: &Path) -> Result<T, AdventError> where AdventError: From<<T as FromStr>::Err> {
    let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    path.push(file_path);
    let mut file = File::open(path).expect("no such file");
    let mut str: String = "".to_string();
    file.read_to_string(&mut str)?;
    Ok(T::from_str(str.as_str())?)
}

pub fn get_lines(file_path: &Path) -> Lines<BufReader<File>> {
    let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    path.push(file_path);
    let file = File::open(path).expect("no such file");
    let buf = BufReader::new(file);
    let lines = buf.lines();
    lines
}