extern crate hyper;
use hyper::client::Client;
use hyper::header::UserAgent;
use hyper::status::StatusCode;

#[macro_use] extern crate log;
extern crate env_logger;

extern crate rand;
use rand::{ thread_rng, Rng};

use std::fs;
use std::fs::File;
use std::sync::Arc;
use std::ops::Deref;
use std::io::prelude::*;
use std::env;
use std::thread;
use std::time::Duration;
use std::str::FromStr;

use std::path::Path;

static MAX_CHARS: u32 = 77784;
static BASE_URL: &'static str = "http://www.animecharactersdatabase.com/character.php?id=";

fn get_next(base_path: &str) -> u32 {
    let base = Path::new(base_path);
    
    let mut num: u32 = thread_rng().gen_range(1, MAX_CHARS);
    while base.join(format!("{}.html", num)).exists() {
        num = thread_rng().gen_range(1, MAX_CHARS);
    }
    return num;
}

fn download(client: &Client, base_path: &str, char: u32) {
    debug!("downloading character {}", char);
    let mut res = client.get(&format!("{}{}", BASE_URL, char))
        .header(UserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14915".into()))
        .send()
        .expect("could not send request");
        
    if res.status != StatusCode::Ok {
        panic!("invalid status code {}", res.status);
    }
    debug!("got response");
    
    let mut buf = String::new();
    res.read_to_string(&mut buf).expect("could not read response");
    
    // v I don't know whether that works anymore
    if buf.find("IP ban").is_some() {
        panic!("WE ARE BANNED");
    }
    
    let mut f = File::create(Path::new(base_path).join(format!("{}.html", char))).expect("could not create file");
    
    f.write_all(buf.as_bytes()).expect("could not write response to file");
}

fn main() {
    let timeout = u64::from_str(&(env::var("TIMEOUT").expect("TIMEOUT env var not set"))).expect("invalid TIMEOUT env var");
    let base_path = env::var("OUT").expect("OUT not set");
    env_logger::init().unwrap();
    fs::create_dir_all("html").ok();
    
    let client = Arc::new(Client::new());
    
    loop {
        info!("getting next character");
        download(client.clone().deref(), &base_path, get_next(&base_path));
        thread::sleep(Duration::from_secs(timeout));
    }
}