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//! # My Crate
//!
//! `my_crate` is a collection of utilities to make performing certain
//! calculations more convenient.

use std::error::Error;
use std::fs;

/// struct Config
/// Add by lryong
pub struct Config {
    pub query: String,
    pub filename: String,
    // pub case_sensitive: bool,
}

/// Implement new function for Config
/// Add by lryong
impl Config {
    // fn new(args: &[String]) -> Config {
    pub fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
        args.next();

        /*
        if args.len() < 3 {
            // panic!("not enough arguments");
            return Err("not enough arguments");
        }
        */

        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 = env::var("CASE_INSENSITIVE").is_err();

        Ok(Config { query, filename })
    }
}

/// run function for Search
/// This is the app entrance.
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
    /*
    let contents =
        fs::read_to_string(config.filename).expect("Something went wrong reading the file");
    */

    let contents = fs::read_to_string(config.filename)?;

    for line in search(&config.query, &contents) {
        println!("{}", line);
    }

    // println!("With text:\n{}", contents);
    Ok(())
}

/// Search feature
/// exmaple TODO
pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    /*
    let query = query.to_lowercase();
    let mut results = Vec::new();

    for line in contents.lines() {
        if line.contains(&query) {
            // do something with line
            results.push(line);
        }
    }

    results
    */

    /*
    let mut results = Vec::new();

    for line in contents.lines() {
        if line.contains(query) {
            results.push(line);
        }
    }

    results
    */

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

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn case_sensitive() {
        let query = "duct";
        let contents = "\
Rust:
safe,fast, productive.
Pick three.";

        assert_eq!(vec!["safe,fast, productive."], search(query, contents));
    }

    #[test]
    fn case_insensitive() {
        let query = "rUsT";
        let contents = "\
Rust:
safe,fast, productive.
Pick three.
Trust me.";

        assert_eq!(vec!["Trust me."], search(query, contents));
    }
}