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extern crate byteorder;

use std::error::Error;
use std::io::prelude::*;

use backend::Backend;
use self::byteorder::{ReadBytesExt, WriteBytesExt, BigEndian};
use types::{self, FromSql, ToSql, IsNull};

impl<DB: Backend<RawValue=[u8]>> FromSql<types::Float, DB> for f32 {
    fn from_sql(bytes: Option<&[u8]>) -> Result<Self, Box<Error+Send+Sync>> {
        let mut bytes = not_none!(bytes);
        debug_assert!(bytes.len() <= 4, "Received more than 4 bytes while decoding \
                      an f32. Was a double accidentally marked as float?");
        bytes.read_f32::<BigEndian>().map_err(|e| Box::new(e) as Box<Error+Send+Sync>)
    }
}

impl<DB: Backend> ToSql<types::Float, DB> for f32 {
    fn to_sql<W: Write>(&self, out: &mut W) -> Result<IsNull, Box<Error+Send+Sync>> {
        out.write_f32::<BigEndian>(*self)
            .map(|_| IsNull::No)
            .map_err(|e| Box::new(e) as Box<Error+Send+Sync>)
    }
}

impl<DB: Backend<RawValue=[u8]>> FromSql<types::Double, DB> for f64 {
    fn from_sql(bytes: Option<&[u8]>) -> Result<Self, Box<Error+Send+Sync>> {
        let mut bytes = not_none!(bytes);
        debug_assert!(bytes.len() <= 8, "Received more than 8 bytes while decoding \
                      an f64. Was a numeric accidentally marked as dobule?");
        bytes.read_f64::<BigEndian>().map_err(|e| Box::new(e) as Box<Error+Send+Sync>)
    }
}

impl<DB: Backend> ToSql<types::Double, DB> for f64 {
    fn to_sql<W: Write>(&self, out: &mut W) -> Result<IsNull, Box<Error+Send+Sync>> {
        out.write_f64::<BigEndian>(*self)
            .map(|_| IsNull::No)
            .map_err(|e| Box::new(e) as Box<Error+Send+Sync>)
    }
}