#!/usr/bin/env bash
set -euo pipefail

PROJECT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SYSTEMD_DIR="$PROJECT_DIR/systemd"
RENDER_DIR="$SYSTEMD_DIR/rendered"

USER_NAME="${BILIUP_NEXT_USER:-$(id -un)}"
GROUP_NAME="${BILIUP_NEXT_GROUP:-$(id -gn)}"
DEFAULT_PYTHON="$PROJECT_DIR/../.venv/bin/python"
if [[ -x "$DEFAULT_PYTHON" ]]; then
  PYTHON_BIN="${BILIUP_NEXT_PYTHON:-$(readlink -f "$DEFAULT_PYTHON")}"
else
  PYTHON_BIN="${BILIUP_NEXT_PYTHON:-$(command -v python3)}"
fi

render_unit() {
  local template="$1"
  local output="$2"
  sed \
    -e "s|__PROJECT_DIR__|$PROJECT_DIR|g" \
    -e "s|__USER__|$USER_NAME|g" \
    -e "s|__GROUP__|$GROUP_NAME|g" \
    -e "s|__PYTHON_BIN__|$PYTHON_BIN|g" \
    "$template" > "$output"
}

mkdir -p "$RENDER_DIR"

render_unit \
  "$SYSTEMD_DIR/biliup-next-worker.service.template" \
  "$RENDER_DIR/biliup-next-worker.service"
render_unit \
  "$SYSTEMD_DIR/biliup-next-api.service.template" \
  "$RENDER_DIR/biliup-next-api.service"

sudo install -m 0644 "$RENDER_DIR/biliup-next-worker.service" /etc/systemd/system/biliup-next-worker.service
sudo install -m 0644 "$RENDER_DIR/biliup-next-api.service" /etc/systemd/system/biliup-next-api.service

sudo systemctl daemon-reload
sudo systemctl enable --now biliup-next-worker.service
sudo systemctl enable --now biliup-next-api.service

echo "Installed:"
echo "  /etc/systemd/system/biliup-next-worker.service"
echo "  /etc/systemd/system/biliup-next-api.service"
echo "User: $USER_NAME"
echo "Group: $GROUP_NAME"
echo "Python: $PYTHON_BIN"