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

/// Adds one to the number given.
///
/// # Examples
///
/// ```
/// let five = 5;
///
/// assert_eq!(6, minigrep::add_one(5));
/// ```
pub fn add_one(x: i32) -> i32 {
    x + 1
}

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

impl Config {
    pub fn new(mut args:std::env::Args) -> Result<Config,&'static str> {
        //if args.len() < 3 {
        //    return Err("not enough arguments");
        //}

        //let query = args[1].clone();
        //let filename = args[2].clone();

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

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

pub fn run(config:Config) -> Result<(), Box<Error>> {
    let mut f = File::open(config.filename)?;//.expect("file not found");

    let mut contents = String::new();
    f.read_to_string(&mut contents)?;
    //    .expect("something went wrong reading the file");

    //println!("With text \n {}",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> {
    //let mut results = Vec::new();

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

    //results

    contents.lines().filter(|x| x.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


    //contents.lines().filter(|x| {
    //    let y = x.to_lowercase();
    //   
    //    y.contains(query)
    //}).collect()
}

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

    #[test]
    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)
        )
    }
}