endixk_minigrep 0.1.0

use std::fs::File;
use std::io::prelude::*;
use std::error::Error;
use std::env;

pub struct Config {
    pub query: String,
    pub filename: String,
    pub case_sensitive: bool,
}

impl Config {
    pub fn new(mut args: env::Args) -> Result<Config, &'static str> {
        args.next();

        let query = match args.next() {
            Some(arg) => arg,
            None => return Err("Didn't get a query string"),
        };
        let filename = match args.next() {
            Some(arg) => arg,
            None => return Err("Didn't get a file name"),
        };
        let case_sensitive = match env::var("CASE_INSENSITIVE") {
            Ok(val) => val == "0",
            Err(_) => true,
        };

        Ok(Config { query, filename, case_sensitive })
    }
}

pub fn run(config: Config) -> Result<(), Box<dyn Error>>{
    let mut f = File::open(config.filename)?;

    let mut contents = String::new();
    f.read_to_string(&mut contents)?;

    let results = if config.case_sensitive {
        search(&config.query, &contents)
    } else {
        search_case_insensitive(&config.query, &contents)
    };

    for line in results {
        println!("{}", line);
    }

    Ok(())
}

pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    contents.lines()
        .filter(|line| line.contains(query))
        .collect()
}

pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let query = query.to_lowercase();

    contents.lines()
        .filter(|line| line.to_lowercase().contains(&query))
        .collect()
}


#[cfg(test)]
mod test {
    use super::*;
    const CONTENTS: &'static str = "Rust:\nsafe, fast, productive.\nPick three.\nDuct tape.\nTrust me.";

    #[test]
    fn case_sensitive() {
        let query = "duct";
        assert_eq!(
            vec!["safe, fast, productive."],
            search(query, CONTENTS)
        );
    }

    #[test]
    fn case_insensitive() {
        let query = "rUsT";
        assert_eq!(
            vec!["Rust:", "Trust me."],
            search_case_insensitive(query, CONTENTS)
        );
    }
}