//!
//! Here is the connector of mongo
//!
//!
use bson::Bson;
use bson::oid::ObjectId;
use mongodb::{Client, ThreadedClient};
use mongodb::db::ThreadedDatabase;


///
/// This function will return abstract of your input
///
///
pub fn greeting(host: &str, port: u16, dbname: &str) { //, username: &str, pass: &str
    let client = Client::connect(host, port)
    .ok().expect("Failed to initialize standalone client.");

    println!("connected.. {}:{}", host, port);
    let db = client.db(dbname);
    println!("use db: {}", dbname);

    //    if (username.len() > 0) {
    //        db.auth(username, pass).ok().expect("Failed to authorize user.");
    //    }

    let coll = db.collection("test");

    println!("connect to test");

    let myOid = ObjectId::with_string("5740269030a3783b30c9fc3f").unwrap();
    let doc = doc!{ "_id" => myOid };

    //    let doc = doc!{ "title" => "Jaws",
    //                      "array" => [ 1, 2, 3 ] };

    /*
    // Insert document into 'test.movies' collection
    coll.insert_one(doc.clone(), None)
    .ok().expect("Failed to insert document.");

    println!("insert doc");
    */

    // Find the document and receive a cursor
    let mut cursor = coll.find(Some(doc.clone()), None)
    .ok().expect("Failed to execute find.");

    println!("find docs");

    let item = cursor.next();

    println!("cursor->next");

    // cursor.next() returns an Option<Result<Document>>
    match item {
        Some(Ok(doc)) => match doc.get("title") {
            Some(&Bson::String(ref title)) => println!("{}", title),
            _ => panic!("Expected title to be a string!"),
        },
        Some(Err(_)) => panic!("Failed to get next from server!"),
        None => panic!("Server returned no results!"),
    }
    println!("all done")
}