#!/usr/bin/env bash
# Clutch Agent — macOS / Linux bootstrap (the "lil thing" you run to connect a box).
# Served by Clutch at:  https://clutch.crutchtech.com/api/collab/cc/connect.sh
# One-paste connect (Clutch fills in your token on the Devices page):
#   BRIDGE_TOKEN=cc_xxx CLUTCH_URL=https://clutch.crutchtech.com/api/collab/cc \
#     bash -c "$(curl -fsSL https://clutch.crutchtech.com/api/collab/cc/connect.sh)"
# Add CLUTCH_SERVICE=1 to install as a persistent service (systemd/launchd).
set -euo pipefail

TOKEN="${BRIDGE_TOKEN:-${CLUTCH_TOKEN:-}}"
URL="${CLUTCH_URL:-https://clutch.crutchtech.com/api/collab/cc}"
SERVICE="${CLUTCH_SERVICE:-0}"

[ -n "$TOKEN" ] || { echo "[clutch] Set BRIDGE_TOKEN first (copy the one-liner from Clutch > Devices > Add a device)." >&2; exit 1; }
case "$TOKEN" in cc_*) : ;; *) echo "[clutch] That token should start with cc_." >&2; exit 1;; esac

command -v node >/dev/null 2>&1 || { echo "[clutch] Node.js 18+ required and not found. Install node, then re-run." >&2; exit 1; }
command -v curl >/dev/null 2>&1 || { echo "[clutch] curl required." >&2; exit 1; }
echo "[clutch] node $(node -v) OK"

DIR="$HOME/.clutch-agent"
mkdir -p "$DIR"
AGENT="$DIR/clutch-device-agent.mjs"
echo "[clutch] downloading agent -> $AGENT"
curl -fsSL "$URL/agent.mjs" -o "$AGENT"

run_foreground() {
  echo "[clutch] connecting this machine to Clutch ($URL) ... (Ctrl+C to stop)"
  exec node "$AGENT" --token "$TOKEN" --url "$URL"
}

install_systemd() {
  local unit="$HOME/.config/systemd/user/clutch-agent.service"
  mkdir -p "$(dirname "$unit")"
  cat > "$unit" <<EOF
[Unit]
Description=Clutch device agent
After=network-online.target

[Service]
Environment=BRIDGE_TOKEN=$TOKEN
Environment=CLUTCH_URL=$URL
ExecStart=$(command -v node) $AGENT --token $TOKEN --url $URL
Restart=always
RestartSec=5

[Install]
WantedBy=default.target
EOF
  systemctl --user daemon-reload
  systemctl --user enable --now clutch-agent.service
  loginctl enable-linger "$(whoami)" >/dev/null 2>&1 || true
  echo "[clutch] installed systemd user service 'clutch-agent' and started. Reconnects on boot."
}

install_launchd() {
  local plist="$HOME/Library/LaunchAgents/com.clutch.agent.plist"
  mkdir -p "$(dirname "$plist")"
  cat > "$plist" <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0"><dict>
  <key>Label</key><string>com.clutch.agent</string>
  <key>ProgramArguments</key><array>
    <string>$(command -v node)</string><string>$AGENT</string>
    <string>--token</string><string>$TOKEN</string>
    <string>--url</string><string>$URL</string>
  </array>
  <key>EnvironmentVariables</key><dict>
    <key>BRIDGE_TOKEN</key><string>$TOKEN</string>
    <key>CLUTCH_URL</key><string>$URL</string>
  </dict>
  <key>RunAtLoad</key><true/>
  <key>KeepAlive</key><true/>
</dict></plist>
EOF
  launchctl unload "$plist" >/dev/null 2>&1 || true
  launchctl load "$plist"
  echo "[clutch] installed launchd agent 'com.clutch.agent' and started. Reconnects on login."
}

if [ "$SERVICE" = "1" ]; then
  if command -v systemctl >/dev/null 2>&1; then install_systemd
  elif [ "$(uname -s)" = "Darwin" ]; then install_launchd
  else echo "[clutch] no systemd/launchd; falling back to nohup background"; nohup node "$AGENT" --token "$TOKEN" --url "$URL" >"$DIR/agent.log" 2>&1 &  echo "[clutch] started in background (pid $!). Log: $DIR/agent.log"; fi
else
  run_foreground
fi