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use std::collections::HashMap;
use std::time::Instant;

pub struct CacheMap<T: Clone> {
    map: HashMap<String, (Instant, T)>,
    timeout: u64,
}

impl<T: Clone> CacheMap<T> {
    pub fn new() -> CacheMap<T> {
        CacheMap {
            map: HashMap::new(),
            timeout: 10,
        }
    }

    pub fn timeout(mut self, timeout: u64) -> CacheMap<T> {
        self.timeout = timeout;
        self
    }

    pub fn get(&self, k: &String) -> Option<&T> {
        match self.map.get(k) {
            Some(t) => {
                if t.0.elapsed().as_secs() >= self.timeout {
                    return None;
                }
                Some(&t.1)
            }
            None => None,
        }
    }

    pub fn insert(&mut self, k: String, v: T) {
        let now = Instant::now();
        self.map.insert(k, (now, v));
    }
}

impl<T: Clone> Clone for CacheMap<T> {
    fn clone(&self) -> CacheMap<T> {
        let mut map: CacheMap<T> = CacheMap {
            map: HashMap::new(),
            timeout: self.timeout,
        };

        for (k, v) in self.map.iter() {
            map.map.insert(k.clone(), (v.0.clone(), v.1.clone()));
        }

        map
    }
}