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extern crate chrono;
extern crate fatcat_api;
#[macro_use]
extern crate diesel;
extern crate diesel_migrations;
extern crate dotenv;
extern crate futures;
extern crate uuid;
#[macro_use]
extern crate hyper;
//extern crate swagger;
#[macro_use]
extern crate error_chain;
extern crate iron;
#[macro_use]
extern crate serde_json;
#[macro_use]
extern crate log;
extern crate data_encoding;

pub mod api_helpers;
pub mod api_server;
pub mod api_wrappers;
pub mod database_models;
pub mod database_schema;

mod errors {
    // Create the Error, ErrorKind, ResultExt, and Result types
    error_chain! {
        foreign_links { Fmt(::std::fmt::Error);
                        Diesel(::diesel::result::Error);
                        R2d2(::diesel::r2d2::Error);
                        Uuid(::uuid::ParseError);
                        Io(::std::io::Error) #[cfg(unix)];
                        Serde(::serde_json::Error);
                        Base32(::data_encoding::DecodeError);
        }
    }
}

#[doc(hidden)]
pub use errors::*;

pub use self::errors::*;
use diesel::pg::PgConnection;
use diesel::prelude::*;
use diesel::r2d2::ConnectionManager;
use dotenv::dotenv;
use iron::middleware::AfterMiddleware;
use iron::{Request, Response};
use std::env;
use data_encoding::BASE32_NOPAD;

#[cfg(feature = "postgres")]
embed_migrations!("../migrations/");

pub type ConnectionPool = diesel::r2d2::Pool<ConnectionManager<diesel::pg::PgConnection>>;

/// Establish a direct database connection. Not currently used, but could be helpful for
/// single-threaded tests or utilities.
pub fn establish_connection() -> PgConnection {
    dotenv().ok();

    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
    PgConnection::establish(&database_url).expect(&format!("Error connecting to {}", database_url))
}

/// Instantiate a new API server with a pooled database connection
pub fn server() -> Result<api_server::Server> {
    dotenv().ok();
    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
    let manager = ConnectionManager::<PgConnection>::new(database_url);
    let pool = diesel::r2d2::Pool::builder()
        .build(manager)
        .expect("Failed to create database pool.");
    Ok(api_server::Server { db_pool: pool })
}

pub fn test_server() -> Result<api_server::Server> {
    dotenv().ok();
    let database_url = env::var("TEST_DATABASE_URL").expect("TEST_DATABASE_URL must be set");
    env::set_var("DATABASE_URL", database_url);

    let server = server()?;
    let conn = server.db_pool.get().expect("db_pool error");

    // run migrations; revert latest (dummy data); re-run latest
    diesel_migrations::run_pending_migrations(&conn).unwrap();
    diesel_migrations::revert_latest_migration(&conn).unwrap();
    diesel_migrations::run_pending_migrations(&conn).unwrap();
    Ok(server)
}

/// HTTP header middleware
header! { (XClacksOverhead, "X-Clacks-Overhead") => [String] }

pub struct XClacksOverheadMiddleware;

impl AfterMiddleware for XClacksOverheadMiddleware {
    fn after(&self, _req: &mut Request, mut res: Response) -> iron::IronResult<Response> {
        res.headers
            .set(XClacksOverhead("GNU aaronsw, jpb".to_owned()));
        Ok(res)
    }
}

/// Convert fatcat IDs (base32 strings) to UUID
pub fn fcid2uuid(fcid: &str) -> Result<uuid::Uuid> {
    if fcid.len() != 20 {
        bail!("invalid fatcat ID (expecting 20-chars of base32");
    }
    let mut raw = vec![0; 16];
    BASE32_NOPAD.decode_mut(fcid.to_uppercase().as_bytes(), &mut raw)
        .map_err(|dp| dp.error)?;
    // unwrap() is safe here, because we know raw is always 16 bytes
    Ok(uuid::Uuid::from_bytes(&raw).unwrap())
}

/// Convert UUID to fatcat ID string (base32 encoded)
pub fn uuid2fcid(id: &uuid::Uuid) -> String {
    let raw = id.as_bytes();
    BASE32_NOPAD.encode(raw).to_lowercase()
}