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use crate::error::Error;
use std::io::{self, Read, Write};
use url::Url;

pub trait Resource: Read + Write {
    fn new(location: Url) -> Result<Self, Error>
    where
        Self: Sized;

    fn close(&mut self);
}

pub struct Stdin {
    inp: ::std::io::Stdin,
}

impl Resource for Stdin {
    fn new(_: Url) -> Result<Stdin, Error> {
        Ok(Stdin { inp: io::stdin() })
    }

    fn close(&mut self) {}
}

impl Write for Stdin {
    fn write(&mut self, _buf: &[u8]) -> io::Result<usize> {
        Err(io::Error::new(io::ErrorKind::Other, "not implemented"))
    }

    fn flush(&mut self) -> io::Result<()> {
        Ok(())
    }
}

impl Read for Stdin {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        let mut handle = self.inp.lock();
        handle.read(buf)
    }
}

pub struct Stdout {
    out: io::Stdout,
}

impl Resource for Stdout {
    fn new(_: Url) -> Result<Stdout, Error> {
        Ok(Stdout { out: io::stdout() })
    }

    fn close(&mut self) {}
}

impl Read for Stdout {
    fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> {
        Err(io::Error::new(io::ErrorKind::Other, "not implemented"))
    }
}

impl Write for Stdout {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        let mut handle = self.out.lock();
        handle.write_all(buf)?;

        Ok(buf.len())
    }

    fn flush(&mut self) -> io::Result<()> {
        let mut handle = self.out.lock();
        handle.flush()?;

        Ok(())
    }
}

pub struct Stderr {
    err: io::Stderr,
}

impl Resource for Stderr {
    fn new(_: Url) -> Result<Stderr, Error> {
        Ok(Stderr { err: io::stderr() })
    }

    fn close(&mut self) {}
}

impl Read for Stderr {
    fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> {
        Err(io::Error::new(io::ErrorKind::Other, "not implemented"))
    }
}

impl Write for Stderr {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        let mut handle = self.err.lock();
        handle.write_all(buf)?;

        Ok(buf.len())
    }

    fn flush(&mut self) -> io::Result<()> {
        let mut handle = self.err.lock();
        handle.flush()?;

        Ok(())
    }
}