extern crate time;

use Result;
use types::{FromSql, FromSqlError, FromSqlResult, ToSql, ToSqlOutput, ValueRef};

const SQLITE_DATETIME_FMT: &'static str = "%Y-%m-%d %H:%M:%S:%f %Z";

impl ToSql for time::Timespec {
    fn to_sql(&self) -> Result<ToSqlOutput> {
        let time_string = time::at_utc(*self)
            .strftime(SQLITE_DATETIME_FMT)
            .unwrap()
            .to_string();
        Ok(ToSqlOutput::from(time_string))
    }
}

impl FromSql for time::Timespec {
    fn column_result(value: ValueRef) -> FromSqlResult<Self> {
        value
            .as_str()
            .and_then(|s| match time::strptime(s, SQLITE_DATETIME_FMT) {
                          Ok(tm) => Ok(tm.to_timespec()),
                          Err(err) => Err(FromSqlError::Other(Box::new(err))),
                      })
    }
}

#[cfg(test)]
mod test {
    use Connection;
    use super::time;

    fn checked_memory_handle() -> Connection {
        let db = Connection::open_in_memory().unwrap();
        db.execute_batch("CREATE TABLE foo (t TEXT, i INTEGER, f FLOAT)")
            .unwrap();
        db
    }

    #[test]
    fn test_timespec() {
        let db = checked_memory_handle();

        let mut ts_vec = vec![];

        ts_vec.push(time::Timespec::new(10_000, 0));//January 1, 1970 2:46:40 AM
        ts_vec.push(time::Timespec::new(10_000, 1000));//January 1, 1970 2:46:40 AM (and one microsecond)
        ts_vec.push(time::Timespec::new(1500391124, 1_000_000));//July 18, 2017
        ts_vec.push(time::Timespec::new(2000000000, 2_000_000));//May 18, 2033
        ts_vec.push(time::Timespec::new(3000000000, 999_999_999));//January 24, 2065
        ts_vec.push(time::Timespec::new(10000000000, 0));//November 20, 2286

        for ts in ts_vec {

            db.execute("INSERT INTO foo(t) VALUES (?)", &[&ts])
                .unwrap();

            let from: time::Timespec = db.query_row("SELECT t FROM foo", &[], |r| r.get(0))
                .unwrap();

            db.execute("DELETE FROM foo", &[]).unwrap();

            assert_eq!(from, ts);
        }

    }
}