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

#[derive(Debug)]
pub struct Config {
    pub query: String,
    pub filename: String,
    pub case_sensitive: bool,
}

impl Config {
    pub fn new(mut args: 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();

        // Listing 13-27: Changing the body of Config::new to use iterator methods
        args.next();
        let query = match args.next() {
            Some(v) => v,
            None => return Err("Didn't get the query."),
        };
        let filename = match args.next() {
            Some(v) => v,
            None => return Err("Didn't get the filename."),
        };

        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 content = fs::read_to_string(config.filename)?;

    let result = if config.case_sensitive {
        search(&config.query, &content)
    } else {
        search_case_insensitive(&config.query, &content)
    };

    for item in result {
        println!("{}", item);
    }

    Ok(())
}

pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    // let mut ret: Vec<&str> = Vec::new();
    // for line in contents.lines() {
    //     if line.contains(query) {
    //         ret.push(line);
    //     }
    // }
    // ret

    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

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

#[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_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)
        );
    }
}