#!/usr/bin/env bash

source ../common.sh

TODO_NixOS

clearStore
rm -rf $TEST_HOME/.cache $TEST_HOME/.config $TEST_HOME/.local
cp ../shell-hello.nix ../config.nix $TEST_HOME
cd $TEST_HOME

cat <<EOF > flake.nix
{
    outputs = {self}: {
      packages.$system.pkgAsPkg = (import ./shell-hello.nix).hello;
      packages.$system.appAsApp = self.packages.$system.appAsApp;

      apps.$system.pkgAsApp = self.packages.$system.pkgAsPkg;
      apps.$system.appAsApp = {
        type = "app";
        program = "\${(import ./shell-hello.nix).hello}/bin/hello";
      };
    };
}
EOF
nix run --no-write-lock-file .#appAsApp
nix run --no-write-lock-file .#pkgAsPkg

! nix run --no-write-lock-file .#pkgAsApp || fail "'nix run' shouldn’t accept an 'app' defined under 'packages'"
! nix run --no-write-lock-file .#appAsPkg || fail "elements of 'apps' should be of type 'app'"

# Test that we're not setting any more environment variables than necessary.
# For instance, we might set an environment variable temporarily to affect some
# initialization or whatnot, but this must not leak into the environment of the
# command being run.
env > $TEST_ROOT/expected-env
nix run -f shell-hello.nix env > $TEST_ROOT/actual-env
# Remove/reset variables we expect to be different.
# - PATH is modified by nix shell
# - _ is set by bash and is expected to differ because it contains the original command
# - __CF_USER_TEXT_ENCODING is set by macOS and is beyond our control
sed -i \
  -e 's/PATH=.*/PATH=.../' \
  -e 's/_=.*/_=.../' \
  -e '/^__CF_USER_TEXT_ENCODING=.*$/d' \
  $TEST_ROOT/expected-env $TEST_ROOT/actual-env
sort $TEST_ROOT/expected-env | uniq > $TEST_ROOT/expected-env.sorted
# nix run appears to clear _. I don't understand why. Is this ok?
echo "_=..." >> $TEST_ROOT/actual-env
sort $TEST_ROOT/actual-env | uniq > $TEST_ROOT/actual-env.sorted
diff $TEST_ROOT/expected-env.sorted $TEST_ROOT/actual-env.sorted

clearStore