#!/usr/bin/env bash
# Checks that the copy of the platform-neutral part of the VM library in this tree is in step with
# the root e2e/lib of this repository (the plan in docs/linux/dev/vm-tests.md, "Writing a
# scenario"): the package komorebi_vm.core, and the unit tests that belong to it. The SOURCE OF TRUTH
# IS THE ROOT e2e/lib, where the core is on its way to the Windows tree, and this tree's copy follows
# it. The script goes away once the root flake builds the KDE VM tests from e2e/lib; until then the
# KDE flake could not reach ../ of its own tree, so the copy stays.
#
#   scripts/linux/sync-e2e-core --check e2e/lib     say what differs, and exit 1 if anything does
#   scripts/linux/sync-e2e-core DEST                copy THIS tree's core into DEST/komorebi_vm/core,
#                                             DEST/tests and DEST/tests/fixtures. That is the direction
#                                             from before the move: the root is the source now, so
#                                             do not point it at e2e/lib; copy the other way by hand.
#
# Nothing else of DEST is touched, and a file of DEST that is not here is reported and left alone.
set -euo pipefail

check=0
if [ "${1:-}" = --check ]; then
  check=1
  shift
fi
dest=${1:?usage: sync-e2e-core [--check] DEST}
repo=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
lib=$repo/nix/linux/tests/vm/lib

tests=(fake_platform.py fake_strip.py fake_wallpaper.py test_checks.py test_suite.py test_pixels.py test_snapshot.py test_recorded.py test_tiling.py
  test_focus_moving.py)

status=0
sync() {
  local from=$1 to=$2
  if [ "$check" = 1 ]; then
    diff -r -x __pycache__ "$from" "$to" >/dev/null 2>&1 || { echo "differs: $to"; status=1; }
  else
    mkdir -p "$to"
    rsync -a --delete --exclude __pycache__ "$from"/ "$to"/
  fi
}

sync "$lib/komorebi_vm/core" "$dest/komorebi_vm/core"
sync "$lib/tests/fixtures" "$dest/tests/fixtures"

for t in "${tests[@]}"; do
  if [ "$check" = 1 ]; then
    cmp -s "$lib/tests/$t" "$dest/tests/$t" || { echo "differs: $dest/tests/$t"; status=1; }
  else
    mkdir -p "$dest/tests"
    cp "$lib/tests/$t" "$dest/tests/$t"
  fi
done

if [ "$check" = 0 ]; then
  echo "synced komorebi_vm/core and ${#tests[@]} tests into $dest"
else
  [ "$status" = 0 ] && echo "in step"
fi
exit "$status"