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use data::Datum;
use marker::Marker;
use reader::Read;

use std::io;
use std::rc::Rc;



#[derive (Clone, Debug)]
pub struct IoreadeofDatum {
    content: Rc<Vec<u8>>
}



impl Datum for IoreadeofDatum {
    fn len (&self) -> usize { Vec::len (&*self.content) }

    fn as_slice (&self) -> &[u8] { Vec::as_slice (&*self.content) }
}



pub struct IoreadeofReader {
    pointer: usize,
    content: IoreadeofDatum
}



impl IoreadeofReader {
    pub fn new<R> (mut data: R) -> IoreadeofReader where R: io::Read {
        let mut buf = String::with_capacity (32 * 1024);

        match data.read_to_string (&mut buf) {
            Ok (_) => (),
            Err ( _ ) => { buf = String::with_capacity (0); }
        };

        IoreadeofReader {
            pointer: 0,
            content: IoreadeofDatum { content: Rc::new (buf.into_bytes ()) }
        }
    }
}



impl Read for IoreadeofReader {
    type Datum = IoreadeofDatum;


    fn consume (&mut self, len: u8) -> Marker {
        let len = self.skip (len);
        Marker::new ((0, self.pointer - len as usize), (0, self.pointer))
    }

    fn consume_long (&mut self, len: usize) -> Marker {
        let len = self.skip_long (len);
        Marker::new ((0, self.pointer - len), (0, self.pointer))
    }

    #[inline (always)]
    fn get_datum (&mut self, index: usize) -> Option<IoreadeofDatum> {
        if index == 0 { Some ( self.content.clone () ) } else { None }
    }


    fn skip (&mut self, len: u8) -> u8 {
        if self.pointer < self.content.len () {
            if self.pointer + (len as usize) < self.content.len () {
                self.pointer += len as usize;
                len

            } else {
                let len = self.content.len () - self.pointer;
                self.pointer += len;

                len as u8
            }
        } else { 0 }
    }


    fn skip_long (&mut self, len: usize) -> usize {
        if self.pointer < self.content.len () {
            if self.pointer + len < self.content.len () {
                self.pointer += len;
                len

            } else {
                let len = self.content.len () - self.pointer;
                self.pointer += len;

                len
            }
        } else { 0 }
    }


    #[inline (always)]
    fn has (&mut self, len: u8) -> bool { self.pointer + len as usize <= self.content.len () }

    #[inline (always)]
    fn has_long (&mut self, len: usize) -> bool { self.pointer + len <= self.content.len () }

    #[inline (always)]
    fn byte_at_start (&mut self, byte: u8) -> bool { self.content.content.get (self.pointer) == Some (&byte) }

    #[inline (always)]
    fn byte_at (&mut self, byte: u8, at: usize) -> bool { self.content.content.get (self.pointer + at) == Some (&byte) }

    #[inline (always)]
    fn bytes_2_at_start (&mut self, bytes: [u8; 2]) -> bool { self.content.content.get (self.pointer .. self.pointer + 2) == Some (&bytes) }

    #[inline (always)]
    fn bytes_2_at (&mut self, bytes: [u8; 2], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + 2) == Some (&bytes) }

    #[inline (always)]
    fn bytes_3_at_start (&mut self, bytes: [u8; 3]) -> bool { self.content.content.get (self.pointer .. self.pointer + 3) == Some (&bytes) }

    #[inline (always)]
    fn bytes_3_at (&mut self, bytes: [u8; 3], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + 3) == Some (&bytes) }

    #[inline (always)]
    fn bytes_4_at_start (&mut self, bytes: [u8; 4]) -> bool { self.content.content.get (self.pointer .. self.pointer + 4) == Some (&bytes) }

    #[inline (always)]
    fn bytes_4_at (&mut self, bytes: [u8; 4], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + 4) == Some (&bytes) }

    #[inline (always)]
    fn bytes_at_start (&mut self, bytes: &[u8]) -> bool { self.content.content.get (self.pointer .. self.pointer + bytes.len ()) == Some (bytes) }

    #[inline (always)]
    fn bytes_at (&mut self, bytes: &[u8], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + bytes.len ()) == Some (bytes) }

    #[inline (always)]
    fn slice_at (&mut self, at: usize, len: usize) -> Option<&[u8]> { self.content.content.get (self.pointer + at .. self.pointer + at + len) }

    #[inline (always)]
    fn get_byte_at (&mut self, at: usize) -> Option<u8> { self.content.content.get (self.pointer + at).map (|b| *b) }

    #[inline (always)]
    fn get_byte_at_start (&mut self) -> Option<u8> { self.content.content.get (self.pointer).map (|b| *b) }

    #[inline (always)]
    fn get_bytes_2_at (&mut self, at: usize) -> Option<(u8, u8)> { self.content.content.get (self.pointer + at .. self.pointer + at + 2).map (|ref bs| (bs[0], bs[1])) }

    #[inline (always)]
    fn get_bytes_2_at_start (&mut self) -> Option<(u8, u8)> { self.content.content.get (self.pointer .. self.pointer + 2).map (|ref bs| (bs[0], bs[1])) }

    #[inline (always)]
    fn get_bytes_3_at (&mut self, at: usize) -> Option<(u8, u8, u8)> { self.content.content.get (self.pointer + at .. self.pointer + at + 3).map (|ref bs| (bs[0], bs[1], bs[2])) }

    #[inline (always)]
    fn get_bytes_3_at_start (&mut self) -> Option<(u8, u8, u8)> { self.content.content.get (self.pointer .. self.pointer + 3).map (|ref bs| (bs[0], bs[1], bs[2])) }

    #[inline (always)]
    fn get_bytes_4_at (&mut self, at: usize) -> Option<(u8, u8, u8, u8)> { self.content.content.get (self.pointer + at .. self.pointer + at + 4).map (|ref bs| (bs[0], bs[1], bs[2], bs[3])) }

    #[inline (always)]
    fn get_bytes_4_at_start (&mut self) -> Option<(u8, u8, u8, u8)> { self.content.content.get (self.pointer .. self.pointer + 4).map (|ref bs| (bs[0], bs[1], bs[2], bs[3])) }
}