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//! [r2d2](https://github.com/sfackler/r2d2) connection pool protocol for InfluxDB.

pub extern crate influxdb;
pub extern crate r2d2;

pub mod ext;

use ext::SyncClient;
use influxdb::{Client, Error as InfluxDBError};

use std::convert::From;
use std::error;
use std::error::Error as _StdError;
use std::fmt;

/// An extension for influxdb::Error for the Error trait
#[derive(Debug)]
pub enum Error {
    Other(InfluxDBError),
}

impl fmt::Display for Error {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        write!(fmt, "{}", self.description())
    }
}

impl error::Error for Error {
    fn description(&self) -> &str {
        match *self {
            Error::Other(ref err) => match err {
                InfluxDBError::InvalidQueryError { .. } => "query is invalid",
                InfluxDBError::UrlConstructionError { .. } => "failed to build URL",
                InfluxDBError::ProtocolError { .. } => "http protocol error",
                InfluxDBError::DeserializationError { .. } => "http protocol error",
                InfluxDBError::DatabaseError { .. } => "database error",
                InfluxDBError::AuthenticationError => "authentication error",
                InfluxDBError::AuthorizationError => "authorization error",
                InfluxDBError::ConnectionError { .. } => "connection error",
            },
        }
    }
}

#[derive(Clone, Debug)]
pub struct InfluxDBConnectionInfo {
    url: String,
    database: String,
    username: Option<String>,
    password: Option<String>,
    is_auth: bool,
}

#[derive(Debug)]
pub struct InfluxDBConnectionManager {
    info: InfluxDBConnectionInfo,
}

impl InfluxDBConnectionManager {
    pub fn new<T: Into<InfluxDBConnectionInfo>>(params: T) -> InfluxDBConnectionManager {
        InfluxDBConnectionManager {
            info: params.into(),
        }
    }
}

/// InfluxDB connection info
pub struct SimpleInfo {
    pub url: String,
    pub database: String,
}

/// InfluxDB connection info with Authenticator
pub struct AuthInfo {
    pub url: String,
    pub database: String,
    pub username: String,
    pub password: String,
}

impl From<SimpleInfo> for InfluxDBConnectionInfo {
    fn from(item: SimpleInfo) -> Self {
        InfluxDBConnectionInfo {
            url: item.url,
            database: item.database,
            username: None,
            password: None,
            is_auth: false,
        }
    }
}

impl From<AuthInfo> for InfluxDBConnectionInfo {
    fn from(item: AuthInfo) -> Self {
        InfluxDBConnectionInfo {
            url: item.url,
            database: item.database,
            username: Some(item.username),
            password: Some(item.password),
            is_auth: true,
        }
    }
}

/// An `r2d2::ConnectionManager` for `InfluxDB::Client`s.
///
/// ## Example
///

/// ```rust
/// extern crate r2d2_influxdb;
///
/// use r2d2_influxdb::{r2d2, InfluxDBConnectionManager, SimpleInfo};
/// use std::thread;
///
/// fn main() {
///     let info = SimpleInfo {
///         url: "http://localhost:8086".into(),
///         database: "test".into(),
///     };
///     let manager = InfluxDBConnectionManager::new(info);
///     let pool = r2d2::Pool::builder().build(manager).unwrap();
///
///     let mut handles = vec![];
///
///     for _i in 0..10i32 {
///         let pool = pool.clone();
///         handles.push(thread::spawn(move || {
///             let conn = pool.get().unwrap();
///             let reply = conn.ping();
///             println!("{:?}", reply);
///             assert!(reply.is_ok())
///         }));
///     }
///
///     for h in handles {
///         h.join().unwrap();
///     }
/// }
/// ```
impl r2d2::ManageConnection for InfluxDBConnectionManager {
    type Connection = SyncClient;
    type Error = Error;

    fn connect(&self) -> Result<SyncClient, Error> {
        let client = if self.info.is_auth {
            Client::new(self.info.url.to_owned(), self.info.database.to_owned()).with_auth(
                self.info.username.to_owned().unwrap(),
                self.info.password.to_owned().unwrap(),
            )
        } else {
            Client::new(self.info.url.to_owned(), self.info.database.to_owned())
        };
        Ok(SyncClient::new(client))
    }

    fn is_valid(&self, conn: &mut SyncClient) -> Result<(), Error> {
        conn.ping().map_err(Error::Other).map(|_| ())
    }

    fn has_broken(&self, conn: &mut SyncClient) -> bool {
        self.is_valid(conn).is_err()
    }
}