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use std::{fs, env};
use std::error::Error;

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

impl Config{
    pub fn new(args:&[String])-> Result<Config, &'static str> {
        if args.len()<3{
            return   Err("Not enough arguments");
        }
        let query = args[1].clone();
        let filename = args[2].clone();
        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
        Ok(Config{query,filename, case_sensitive})
    }
}


/// Adds one to the number given.
///
/// # Examples
///
/// ```
/// let arg = 5;
/// let answer = my_crate::add_one(arg);
///
/// assert_eq!(6, answer);
/// ```
pub fn run(config: Config) -> Result<(), Box<dyn Error>>{
   let contents = fs::read_to_string(config.filename)? ;

    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> {
//    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)
    }).collect()
}

pub fn search_case_insensitive<'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.to_lowercase().contains(&query) {
            results.push(line);
        }
    }

    results
}

#[cfg(test)]
mod tests{
use super::*;
    #[test]
   fn one_result(){
       let query = "duct";
       let content = "\
       Rust:
safe, fast, productive.
Pick three.";
       assert_eq!(vec!["safe, fast, productive."],
                  search(query, content))

   }

    fn case_sensitive(){
        let query = "duct";
        let contents = "\
       Rust:
safe, fast, productive.
Pick three.
Duct tape.";

        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!["Rust:", "Trust me."],
            search_case_insensitive(query, contents)
        );
    }
}