#!/usr/bin/env bash
# gstack-dispatch-install — install the dispatch daemon as a persistent service
# Usage: gstack-dispatch-install [--uninstall]
#
# macOS: creates a launchd plist in ~/Library/LaunchAgents/
# Linux: creates a systemd user service
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
DAEMON_BIN="$SCRIPT_DIR/gstack-dispatch-daemon"
SERVICE_NAME="com.gstack.dispatch-daemon"

if [ ! -f "$DAEMON_BIN" ]; then
  echo "Error: daemon binary not found at $DAEMON_BIN" >&2
  exit 1
fi

uninstall() {
  if [[ "$OSTYPE" == darwin* ]]; then
    PLIST="$HOME/Library/LaunchAgents/${SERVICE_NAME}.plist"
    launchctl unload "$PLIST" 2>/dev/null || true
    rm -f "$PLIST"
    echo "Uninstalled launchd service: $PLIST"
  elif command -v systemctl >/dev/null 2>&1; then
    systemctl --user stop "$SERVICE_NAME" 2>/dev/null || true
    systemctl --user disable "$SERVICE_NAME" 2>/dev/null || true
    rm -f "$HOME/.config/systemd/user/${SERVICE_NAME}.service"
    systemctl --user daemon-reload
    echo "Uninstalled systemd service: $SERVICE_NAME"
  else
    echo "No supported service manager found"
    exit 1
  fi
}

install_macos() {
  PLIST_DIR="$HOME/Library/LaunchAgents"
  mkdir -p "$PLIST_DIR"
  PLIST="$PLIST_DIR/${SERVICE_NAME}.plist"

  cat > "$PLIST" << PLIST_EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>${SERVICE_NAME}</string>
  <key>ProgramArguments</key>
  <array>
    <string>${DAEMON_BIN}</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
  <key>KeepAlive</key>
  <true/>
  <key>StandardOutPath</key>
  <string>${HOME}/.gstack/dispatch/daemon-stdout.log</string>
  <key>StandardErrorPath</key>
  <string>${HOME}/.gstack/dispatch/daemon-stderr.log</string>
  <key>EnvironmentVariables</key>
  <dict>
    <key>PATH</key>
    <string>/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:${HOME}/.bun/bin</string>
  </dict>
</dict>
</plist>
PLIST_EOF

  launchctl unload "$PLIST" 2>/dev/null || true
  launchctl load "$PLIST"
  echo "Installed and started launchd service: $PLIST"
  echo "Logs: ~/.gstack/dispatch/daemon-stdout.log"
}

install_linux() {
  SERVICE_DIR="$HOME/.config/systemd/user"
  mkdir -p "$SERVICE_DIR"
  SERVICE_FILE="$SERVICE_DIR/${SERVICE_NAME}.service"

  cat > "$SERVICE_FILE" << SERVICE_EOF
[Unit]
Description=gstack dispatch daemon
After=network.target

[Service]
ExecStart=${DAEMON_BIN}
Restart=always
RestartSec=10
Environment=PATH=/usr/local/bin:/usr/bin:/bin:%h/.bun/bin
StandardOutput=append:%h/.gstack/dispatch/daemon-stdout.log
StandardError=append:%h/.gstack/dispatch/daemon-stderr.log

[Install]
WantedBy=default.target
SERVICE_EOF

  systemctl --user daemon-reload
  systemctl --user enable "$SERVICE_NAME"
  systemctl --user start "$SERVICE_NAME"
  echo "Installed and started systemd service: $SERVICE_FILE"
  echo "Status: systemctl --user status $SERVICE_NAME"
  echo "Logs: ~/.gstack/dispatch/daemon-stdout.log"
}

# Parse args
if [ "${1:-}" = "--uninstall" ]; then
  uninstall
  exit 0
fi

mkdir -p "$HOME/.gstack/dispatch"

if [[ "$OSTYPE" == darwin* ]]; then
  install_macos
elif command -v systemctl >/dev/null 2>&1; then
  install_linux
else
  echo "No supported service manager found (need launchd or systemd)"
  echo "Run manually: $DAEMON_BIN &"
  exit 1
fi