use std::fmt;

use rustc_middle::ty;

use crate::traits;
use crate::traits::project::Normalized;

// Structural impls for the structs in `traits`.

impl<'tcx, T: fmt::Debug> fmt::Debug for Normalized<'tcx, T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Normalized({:?}, {:?})", self.value, self.obligations)
    }
}

impl<'tcx, O: fmt::Debug> fmt::Debug for traits::Obligation<'tcx, O> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if ty::tls::with(|tcx| tcx.sess.verbose_internals()) {
            write!(
                f,
                "Obligation(predicate={:?}, cause={:?}, param_env={:?}, depth={})",
                self.predicate, self.cause, self.param_env, self.recursion_depth
            )
        } else {
            write!(f, "Obligation(predicate={:?}, depth={})", self.predicate, self.recursion_depth)
        }
    }
}

impl<'tcx> fmt::Debug for traits::MismatchedProjectionTypes<'tcx> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "MismatchedProjectionTypes({:?})", self.err)
    }
}