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//!#my struct
//!
//! you know for simple
//!
//! this is for test
//!
//!
//!
//!

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

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(args) => args ,
            None => return Err("didn't get a file name")
        };

        let case_sensitive = env::var("CASE_INSENSITIVE").is_ok();

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

///那就你给我的giaogiao
///
/// #Examples
///
/// ```
/// let arg = 5;
/// let answer = giao;
///
/// assert_eq!(dadada)
///
/// ```
///
///
///
///
///
///
///

pub fn run(config: Config) -> Result<() , Box<dyn Error>>{

    let contents = fs::read_to_string(config.filename)?;


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


    for line in result {

        println!("{}" , line)

    }

    Ok(())
}

fn search<'a>(query: &'a str , contents: &'a str) -> Vec<&'a str>{

        contents.lines()
            .filter(|line|{

                    line.contains(query)
            })
            .collect()

}

fn search_case_insensitive<'a>(query: &str , contents: &'a str) -> Vec<&'a str>{

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

}


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

    #[test]
    fn one_result(){
        let query = "duct";
        let contents = "\
            Rust:
            safe , fast , productive
            pick thread
            Duct tape";

        assert_eq!(
            vec!["safe , fast , productive"] ,
            search(query , contents)
        )
    }
    #[test]
    fn case_sensitive(){

        let query = "rUsT";
        let contents = "\
            Rust:
            safe , fast , productive
            pick three
            Trust me";

        assert_eq!(
            vec!["Rust:" , "Trust me"] ,
            search_case_insensitive(query , contents)
        );

    }

    use std::thread;
    use std::time::Duration;

    #[test]
    fn simulated_expensive_calculation(){
        let s = sss{
          name: 0,
        };


    }

    struct sss{
        pub name: u32,
    }

    impl Iterator for sss{
        type Item = u32;

        fn next(&mut self) -> Option<Self::Item> {
            self.name += 1;

            if self.name<6 {
                Some(self.name)
            }else {
                None
            }
        }
    }

}