extern crate actix_web;
extern crate serde;
extern crate serde_json;
#[macro_use]
extern crate serde_derive;
extern crate rusqlite;
extern crate time;

use actix_web::{fs, fs::NamedFile, http, server, App, HttpRequest, HttpResponse, Query};
use std::env;
use std::ops::Deref;

use rusqlite::{Connection};

fn main() {
  println!("Access me at http://localhost:8080");
  server::new(|| {
    App::new()
      .route("/service/search", http::Method::GET, search)
      .resource("/", |r| r.f(index))
      .handler(
        "/static",
        fs::StaticFiles::new(front_end_dir())
          .unwrap()
          // .index_file("index.html"),
      )
      .finish()
  }).bind("localhost:8080")
    .unwrap()
    .run();
}

fn index(_req: &HttpRequest) -> Result<NamedFile, actix_web::error::Error> {
  Ok(NamedFile::open(front_end_dir() + "/index.html")?)
}

fn front_end_dir() -> String {
  env::var("TORRENTS_CSV_FRONT_END_DIR").unwrap_or("../ui/dist".to_string())
}

fn torrents_db_file() -> String {
  env::var("TORRENTS_CSV_DB_FILE").unwrap_or("../../torrents.db".to_string())
}

#[derive(Deserialize)]
struct SearchQuery {
  q: String,
  page: Option<usize>,
  size: Option<usize>,
  type_: Option<String>
}

fn search(query: Query<SearchQuery>) -> HttpResponse {
  HttpResponse::Ok()
    .header("Access-Control-Allow-Origin", "*")
    .content_type("application/json")
    .body(search_query(query))
}

fn search_query(query: Query<SearchQuery>) -> String {
  let page = query.page.unwrap_or(1);
  let size = query.size.unwrap_or(10);
  let type_ = query.type_.as_ref().map_or("torrent", String::deref);
  let offset = size * (page - 1);

  println!("query = {}, type = {}, page = {}, size = {}", query.q, type_, page, size);

  if type_ == "file" {
    let results = torrent_file_search(&query.q, size, offset);
    serde_json::to_string(&results).unwrap()
  } else {
    let results = torrent_search(&query.q, size, offset);
    serde_json::to_string(&results).unwrap()
  }
}

#[derive(Debug, Serialize, Deserialize)]
struct Torrent {
  infohash: String,
  name: String,
  size_bytes: isize,
  created_unix: u32,
  seeders: u32,
  leechers: u32,
  completed: Option<u32>,
  scraped_date: u32,
}

fn torrent_search(query: &str, size: usize, offset: usize) -> Vec<Torrent> {
  let stmt_str = "select * from torrents where name like '%' || ?1 || '%' limit ?2 offset ?3";
  let conn = Connection::open(torrents_db_file()).unwrap();
  let mut stmt = conn.prepare(&stmt_str).unwrap();
  let torrent_iter = stmt
    .query_map(&[
      query.replace(" ", "%"),
      size.to_string(),
      offset.to_string(),
    ], |row| Torrent {
      infohash: row.get(0),
      name: row.get(1),
      size_bytes: row.get(2),
      created_unix: row.get(3),
      seeders: row.get(4),
      leechers: row.get(5),
      completed: row.get(6),
      scraped_date: row.get(7),
    }).unwrap();

  let mut torrents = Vec::new();
  for torrent in torrent_iter {
    torrents.push(torrent.unwrap());
  }
  torrents
}

#[derive(Debug, Serialize, Deserialize)]
struct File {
  infohash: String,
  index_: u32,
  path: String,
  size_bytes: isize,
  created_unix: u32,
  seeders: u32,
  leechers: u32,
  completed: Option<u32>,
  scraped_date: u32,
}

fn torrent_file_search(query: &str, size: usize, offset: usize) -> Vec<File> {
  let stmt_str = "select * from files where path like '%' || ?1 || '%' limit ?2 offset ?3";
  let conn = Connection::open(torrents_db_file()).unwrap();
  let mut stmt = conn.prepare(&stmt_str).unwrap();
  let file_iter = stmt
    .query_map(&[
      query.replace(" ", "%"),
      size.to_string(),
      offset.to_string(),
    ], |row| File {
      infohash: row.get(0),
      index_: row.get(1),
      path: row.get(2),
      size_bytes: row.get(3),
      created_unix: row.get(4),
      seeders: row.get(5),
      leechers: row.get(6),
      completed: row.get(7),
      scraped_date: row.get(8),
    }).unwrap();

  let mut files = Vec::new();
  for file in file_iter {
    files.push(file.unwrap());
  }
  files
}


#[cfg(test)]
mod tests {
  use time::PreciseTime;

  #[test]
  fn test() {
    let start = PreciseTime::now();
    let results =
      super::torrent_search("sherlock", 10, 0);
    assert!(results.len() > 2);
    let end = PreciseTime::now();
    println!("Query took {} seconds.", start.to(end));
  }
}