#!/bin/sh
set -e

REPO="AchuM/backupagent.ai"
INSTALL_DIR="/usr/local/bin"
CONFIG_DIR="/etc/backupagent"
DATA_DIR="/var/lib/backupagent"

echo ""
echo "  BackupAgent.ai — Installer"
echo ""

OS=$(uname -s | tr '[:upper:]' '[:lower:]')
ARCH=$(uname -m)
case "$ARCH" in
    x86_64|amd64) ARCH="amd64" ;;
    aarch64|arm64) ARCH="arm64" ;;
    *) echo "Error: Unsupported architecture: $ARCH"; exit 1 ;;
esac

echo "  Detected: ${OS}/${ARCH}"

LATEST=$(curl -fsSL "https://api.github.com/repos/${REPO}/releases/latest" 2>/dev/null | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/\1/' || echo "v1.0.0")
BINARY="backupagent-${OS}-${ARCH}"
URL="https://github.com/${REPO}/releases/download/${LATEST}/${BINARY}"

echo "  Downloading BackupAgent ${LATEST}..."
if curl -fsSL -o /tmp/backupagent "${URL}" 2>/dev/null; then
  echo "  Downloaded from GitHub releases"
else
  echo "  Note: Release binary not yet available."
  echo "  Build from source: cd agent && go build -o /usr/local/bin/backupagent"
  exit 1
fi

chmod +x /tmp/backupagent
sudo mv /tmp/backupagent "${INSTALL_DIR}/backupagent"
sudo mkdir -p "${CONFIG_DIR}" "${DATA_DIR}"
sudo chmod 700 "${CONFIG_DIR}" "${DATA_DIR}"

if [ "${OS}" = "linux" ] && command -v systemctl >/dev/null 2>&1; then
  sudo tee /etc/systemd/system/backupagent.service >/dev/null <<'UNIT'
[Unit]
Description=BackupAgent — AI-Verified Database Backups
After=network-online.target docker.service
Wants=network-online.target
[Service]
Type=simple
ExecStart=/usr/local/bin/backupagent run
Restart=always
RestartSec=10
User=root
WorkingDirectory=/etc/backupagent
ProtectSystem=strict
ReadWritePaths=/etc/backupagent /var/lib/backupagent /tmp
PrivateTmp=yes
[Install]
WantedBy=multi-user.target
UNIT
  sudo systemctl daemon-reload
  echo "  Systemd service installed"
fi

echo ""
echo "  BackupAgent installed!"
echo "  Next: backupagent register --token YOUR_TOKEN"
echo ""