#!/usr/bin/env sh
# Offsync install bootstrap.
#
#   curl -fsSL https://offsync.app/install.sh | sh
#
# Idempotent. Doesn't require sudo. Works on macOS + Linux today; Windows
# lands at M4 with a parallel install.ps1.
#
# What it does:
#   1. Detects platform (darwin | linux). Bails on unsupported OSes.
#   2. Checks for Node 20+. If absent, installs via nvm (no sudo, no
#      package-manager assumption — nvm writes to $HOME/.nvm/).
#   3. Runs `npm install -g offsync`.
#   4. Tells the user to run `offsync start`.
#
# Re-running is safe: it skips already-satisfied steps and never overwrites
# a working Node install.

set -eu

log() { printf '\033[35m[offsync]\033[0m %s\n' "$1" >&2; }
err() { printf '\033[31m[offsync error]\033[0m %s\n' "$1" >&2; exit 1; }

# ── 1. Platform check ────────────────────────────────────────────────────
OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
case "$OS" in
  darwin) PLATFORM="macOS" ;;
  linux)  PLATFORM="Linux" ;;
  *)      err "Unsupported platform: $OS. Offsync ships for macOS today, Linux daemon-only, Windows at M4." ;;
esac
log "Detected $PLATFORM."

# Architecture sanity. Offsync's Mac daemon is Apple Silicon only right now.
ARCH="$(uname -m)"
if [ "$OS" = "darwin" ] && [ "$ARCH" != "arm64" ]; then
  err "Offsync's macOS daemon is Apple Silicon (arm64) only. You're on $ARCH. Intel support is not on the roadmap — see INSTALLATION_PREFERENCES.md."
fi

# ── 2. Node 20+ check ────────────────────────────────────────────────────
NEED_NODE="true"
if command -v node >/dev/null 2>&1; then
  NODE_MAJOR="$(node -v 2>/dev/null | sed -n 's/^v\([0-9][0-9]*\).*$/\1/p')"
  if [ -n "$NODE_MAJOR" ] && [ "$NODE_MAJOR" -ge 20 ] 2>/dev/null; then
    log "Node $(node -v) already installed — skipping Node install."
    NEED_NODE="false"
  else
    log "Node present but older than 20 ($(node -v)) — will install Node 20 via nvm into your user home."
  fi
fi

# ── 3. Install Node via nvm if missing ───────────────────────────────────
if [ "$NEED_NODE" = "true" ]; then
  if [ ! -d "${HOME}/.nvm" ]; then
    log "Installing nvm into ~/.nvm (no sudo required)…"
    # PROFILE=/dev/null prevents nvm from auto-editing your shell rc files —
    # we source it ourselves below for the duration of this install.
    PROFILE=/dev/null curl -fsSL \
      https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash >/dev/null
  else
    log "nvm already present at ~/.nvm — skipping nvm install."
  fi

  # Load nvm into THIS shell (it's an init function, not on PATH).
  export NVM_DIR="${HOME}/.nvm"
  # shellcheck disable=SC1091
  . "${NVM_DIR}/nvm.sh"

  log "Installing Node 20 (LTS) via nvm…"
  nvm install 20 >/dev/null
  nvm use 20    >/dev/null
  log "Node $(node -v) installed."

  cat >&2 <<EOF

  --- nvm note ─────────────────────────────────────────────────────────
  nvm was installed into ~/.nvm but your shell rc files were NOT edited.
  To make \`node\` + \`npm\` available in future shells, add this to your
  ~/.zshrc (or ~/.bashrc):

    export NVM_DIR="\$HOME/.nvm"
    [ -s "\$NVM_DIR/nvm.sh" ] && . "\$NVM_DIR/nvm.sh"

  Or run the canonical nvm installer separately, which auto-edits the rc:
    curl -fsSL https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash
  ──────────────────────────────────────────────────────────────────────
EOF
fi

# ── 4. Install the daemon ────────────────────────────────────────────────
log "Installing offsync globally…"
npm install -g offsync >/dev/null

# ── 5. Done ──────────────────────────────────────────────────────────────
cat >&2 <<'EOF'

  Offsync is installed.

    offsync start              # launch the daemon (Ctrl-C stops)
    offsync settings           # open the Settings window
    offsync help               # full CLI reference

  Pair with your phone:
    1. Run `offsync start`
    2. The tray icon's "Open settings…" reveals a QR code
    3. Open the Offsync app on Android and scan it

  Docs:    https://offsync.app
  Source:  https://github.com/oshinpojta/offsync

EOF