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

/// Adds one to the number given.

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


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> {
        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<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![];
    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
}


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

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn one_result() {
        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!["Rust:", "Trust me."],
            search_case_insensitive(query, contents)
        );
    }
}

pub use self::kinds::PrimaryColor;
pub use self::kinds::SecondaryColor;
pub use self::utils::mix;
pub mod kinds {
    /// The primary colors according to the RYB color model.
    pub enum PrimaryColor {
        Red,
        Yellow,
        Blue,
    }

    /// The secondary colors according to the RYB color model.
    pub enum SecondaryColor {
        Orange,
        Green,
        Purple,
    }
}

pub mod utils {
    use crate::kinds::*;

    /// Combines two primary colors in equal amounts to create
    /// a secondary color.
    pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
        // --snip--
        SecondaryColor::Orange
    }
}