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use conch_parser::ast;
use env::{FileDescEnvironment, IsInteractiveEnvironment, WorkingDirectoryEnvironment};
use eval::{Redirect, RedirectEval, WordEval, redirect_append, redirect_clobber,
           redirect_dup_read, redirect_dup_write, redirect_heredoc, redirect_read,
           redirect_readwrite, redirect_write};
use error::RedirectionError;
use io::FileDesc;

impl<W, E: ?Sized> RedirectEval<E> for ast::Redirect<W>
    where W: WordEval<E>,
          W::Error: From<RedirectionError>,
          E: FileDescEnvironment + IsInteractiveEnvironment + WorkingDirectoryEnvironment,
          E::FileHandle: Clone + From<FileDesc>,
{
    type Handle = E::FileHandle;
    type Error = W::Error;
    type EvalFuture = Redirect<W::EvalFuture>;

    fn eval(self, env: &E) -> Self::EvalFuture {
        use conch_parser::ast;

        match self {
            ast::Redirect::Read(fd, w)        => redirect_read(fd, w, env),
            ast::Redirect::ReadWrite(fd, w)   => redirect_readwrite(fd, w, env),
            ast::Redirect::Write(fd, w)       => redirect_write(fd, w, env),
            ast::Redirect::Clobber(fd, w)     => redirect_clobber(fd, w, env),
            ast::Redirect::Append(fd, w)      => redirect_append(fd, w, env),
            ast::Redirect::DupRead(dst, src)  => redirect_dup_read(dst, src, env),
            ast::Redirect::DupWrite(dst, src) => redirect_dup_write(dst, src, env),
            ast::Redirect::Heredoc(fd, body)  => redirect_heredoc(fd, body, env),
        }
    }
}

impl<'a, W, E: ?Sized> RedirectEval<E> for &'a ast::Redirect<W>
    where &'a W: WordEval<E>,
          <&'a W as WordEval<E>>::Error: From<RedirectionError>,
          E: FileDescEnvironment + IsInteractiveEnvironment + WorkingDirectoryEnvironment,
          E::FileHandle: Clone + From<FileDesc>,
{
    type Handle = E::FileHandle;
    type Error = <&'a W as WordEval<E>>::Error;
    type EvalFuture = Redirect<<&'a W as WordEval<E>>::EvalFuture>;

    fn eval(self, env: &E) -> Self::EvalFuture {
        use conch_parser::ast;

        match *self {
            ast::Redirect::Read(fd, ref w)        => redirect_read(fd, w, env),
            ast::Redirect::ReadWrite(fd, ref w)   => redirect_readwrite(fd, w, env),
            ast::Redirect::Write(fd, ref w)       => redirect_write(fd, w, env),
            ast::Redirect::Clobber(fd, ref w)     => redirect_clobber(fd, w, env),
            ast::Redirect::Append(fd, ref w)      => redirect_append(fd, w, env),
            ast::Redirect::DupRead(dst, ref src)  => redirect_dup_read(dst, src, env),
            ast::Redirect::DupWrite(dst, ref src) => redirect_dup_write(dst, src, env),
            ast::Redirect::Heredoc(fd, ref body)  => redirect_heredoc(fd, body, env),
        }
    }
}