#!/usr/bin/env bash
# Idempotent install of a persistent Herdr daemon for the current user.
# Autodetects Linux (systemd --user) vs macOS (launchd LaunchAgent).
#
# Usage (locally):
#   ./install.sh
# Usage (remote):
#   scp -r deploy/fleet/herdr-persistence <host>:/tmp/
#   ssh <host> 'bash -lc "/tmp/herdr-persistence/install.sh"'
#
# Preconditions: `herdr` is installed at $HOME/.local/bin/herdr
# (via `curl -fsSL https://herdr.dev/install.sh | sh`).

set -euo pipefail

here="$(cd "$(dirname "$0")" && pwd)"
herdr="$HOME/.local/bin/herdr"

if [ ! -x "$herdr" ]; then
  echo "herdr binary not found at $herdr — run the herdr install script first." >&2
  exit 1
fi

os="$(uname -s)"
case "$os" in
  Linux)
    unit_dir="$HOME/.config/systemd/user"
    unit="$unit_dir/herdr.service"
    mkdir -p "$unit_dir"
    cp "$here/herdr.service" "$unit"
    # Enable lingering so the user's systemd manager runs without a
    # login session — otherwise the daemon dies at logout.
    if command -v loginctl >/dev/null 2>&1; then
      sudo loginctl enable-linger "$USER" 2>/dev/null || true
    fi
    systemctl --user daemon-reload
    systemctl --user enable --now herdr.service
    systemctl --user status --no-pager herdr.service | head -8
    ;;
  Darwin)
    plist_dir="$HOME/Library/LaunchAgents"
    plist="$plist_dir/dev.herdr.server.plist"
    mkdir -p "$plist_dir"
    sed \
      -e "s|__HERDR_BIN__|$herdr|g" \
      -e "s|__HOME__|$HOME|g" \
      "$here/dev.herdr.plist" > "$plist"
    # Unload first so a re-install replaces cleanly.
    launchctl unload "$plist" 2>/dev/null || true
    launchctl load -w "$plist"
    sleep 1
    launchctl list | grep dev.herdr.server || echo "(agent not in list yet)"
    ;;
  *)
    echo "unsupported OS: $os" >&2
    exit 2
    ;;
esac

echo
echo "herdr daemon persistence installed. Verify with: herdr status server"