use std::fs;
fn main() {
    let args:Vec<String> = std::env::args().collect();
    if args.len() <= 1 {
        println!("Please, provide the input file path to be processed!");
        return;
    }
    let firstArg = &args[1];
    let contents = fs::read_to_string(firstArg)
            .expect("Expected to open the file");
    let splitted_content : std::str::Lines = contents.lines();
    //DONE: Split string lines
    //DONE: get the values from each column 
    //DONE: calculate the distance between the columns 
    //DONE: sum the distances 
    println!("With text:\n{contents}");
    //println!("\n{splittedContent:?}");
    let numbers:i32 = splitted_content
        //.lines()
        //.into_iter()
        .filter_map(|x| {
            let mut nums = x.split_whitespace().filter_map(|i| i.parse::<i32>().ok());
            Some ((nums.next()?,nums.next()?))
        })
        .filter_map(|(a,b)| {
            Some(b - a)
        })        
        //;
        .sum();
    println!("Distance sum: {numbers}");
    /*for number in numbers {
        println!("\n number -> {number:?}");  
    }*/
    /*for line in splitted_content {
        for word in line.split_whitespace() {
            let x = word.parse::<i32>().unwrap();
            let y = x.to_string();
            println!("Word: {word} -> {y}");
        }
    }*/
}