use std::io;
use std::io::prelude::*;
use std::fs::File;

use std::ascii::AsciiExt;

extern crate telegram_bot;
use telegram_bot::{Api, Message, MessageType};
extern crate time;

use feature::FeatureResult;
use feature::Feature;

pub struct Tasterank {
    ranks: Vec<String>,
}

impl Feature for Tasterank {
    fn name(&self) -> &'static str {
        "Tasterank"
    }
    fn init(&mut self) {}
    fn handle(&mut self, a: Api, m: Message) -> Result<FeatureResult, String> {
        if let MessageType::Text(s) = m.msg {
            if !(&s).to_ascii_lowercase().contains("luggas tasterank") {
                return Ok(FeatureResult::Skip);
            }
            let start = time::precise_time_ns();
            if let Err(e) = self.update_ranks() {
                println!("{}", e);
                return Ok(FeatureResult::Skip);
            }
            println!("(benchm) updating ranks: {}ms",
                     (time::precise_time_ns() - start) / 1000000);

            let mut msg = String::new();
            let mut i = 1;
            for rank in &self.ranks {
                msg.push_str(&format!("{}. {}\n", i, rank));
                i += 1;
            }
            println!("(benchm) tasterank before send: {}ms",
                     (time::precise_time_ns() - start) / 1000000);
            if let Err(e) = a.send_message(m.chat.id(), msg, None, None, Some(m.message_id), None) {
                println!("{}", e);
            }
            println!("(benchm) tasterank: {}ms",
                     (time::precise_time_ns() - start) / 1000000);
            return Ok(FeatureResult::Handled);
        }
        Ok(FeatureResult::Skip)
    }
}

impl Tasterank {
    pub fn new() -> Tasterank {
        let mut t = Tasterank { ranks: vec![] };
        t.init();
        t
    }
    fn update_ranks(&mut self) -> Result<(), io::Error> {
        let mut f = try!(File::open("data/tasterank.list"));
        let mut buf = String::new();
        try!(f.read_to_string(&mut buf));
        let temp: Vec<&str> = (&buf).split("\n").collect();
        self.ranks.clear();
        for r in &temp {
            self.ranks.push(r.to_string());
        }
        self.ranks.pop().unwrap();
        Ok(())
    }
}