#!/usr/bin/env bash
# Start a nested niri instance for the tests of dynamonix.
#
# The tests change the outputs. Do not use the socket of the compositor that
# you work in. This script starts a different instance.
set -euo pipefail

directory="$(mktemp -d)"
config="${directory}/config.kdl"

cat > "${config}" <<'KDL'
hotkey-overlay {
    skip-at-startup
}

layout {
    gaps 16
}
KDL

if [ -z "${WAYLAND_DISPLAY:-}" ]; then
    echo "error: WAYLAND_DISPLAY is not set. Start this script in a Wayland session." >&2
    exit 1
fi

before="$(ls "${XDG_RUNTIME_DIR}"/niri.*.sock 2>/dev/null || true)"

niri -c "${config}" &
compositor=$!

for _ in $(seq 1 50); do
    sleep 0.1
    after="$(ls "${XDG_RUNTIME_DIR}"/niri.*.sock 2>/dev/null || true)"
    socket="$(comm -13 <(echo "${before}") <(echo "${after}") | head -1)"
    if [ -n "${socket}" ]; then
        break
    fi
done

if [ -z "${socket:-}" ]; then
    echo "error: the nested instance did not make a socket." >&2
    kill "${compositor}" 2>/dev/null || true
    exit 1
fi

cat <<EOF
The nested niri instance is ready.

  socket:  ${socket}
  process: ${compositor}

Run the test with a true compositor:

  DYNAMONIX_TEST_SOCKET=${socket} cargo test -p dynamonix-ipc --test live

Run the interface:

  cargo run --bin dynamonix -- --socket ${socket}

Stop the instance:

  kill ${compositor}
EOF

wait "${compositor}"