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//! # Minigrep Library
//! 
//! `minigrep_test_package_123` is a collection of utilities to perform
//! string search.

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

/// The function that will be called, when you commit
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 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 })
    }
}

#[cfg(test)]
mod tests {
    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)
        );
    }
}

/// Search character case sensitive
/// 
/// # Examples
/// ```
/// use minigrep_test_package_123::search;
/// let query = "duct";
/// let contents = "\
/// Rust:
/// safe, fast, productive.
/// Pick three.
/// Duct tape.";
/// assert_eq!(
///     vec!["safe, fast, productive."],
///     search(query, contents)
/// );
/// ```
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()
}

/// Search character case-insensitive
/// 
/// # Examples
/// ```
/// use minigrep_test_package_123::search_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 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
}