#!/bin/sh
# Panegrip relay installer: curl -fsSL https://get.panegrip.dev | sh
#
# Downloads panegrip-relay for this machine, checks its SHA-256, installs it
# to ~/.local/bin (PANEGRIP_BIN_DIR to change), starts it as a background
# service and shows a QR code to scan with Panegrip on your iPhone.
#   PANEGRIP_NO_SERVICE=1  install the binary only
#   PANEGRIP_NO_PAIR=1     skip the QR code (for scripted installs)
set -eu

BASE="${PANEGRIP_BASE_URL:-https://get.panegrip.dev}"
say() { printf '%s\n' "$*"; }
fail() { printf 'panegrip: %s\n' "$*" >&2; exit 1; }

case "$(uname -s)" in
  Darwin) os=macos ;;
  Linux) os=linux ;;
  *) fail "only macOS and Linux are supported" ;;
esac
case "$(uname -m)" in
  arm64|aarch64) arch=arm64 ;;
  x86_64|amd64) arch=x86_64 ;;
  *) fail "unsupported CPU: $(uname -m)" ;;
esac

command -v curl >/dev/null 2>&1 || fail "curl is required"
version="$(curl -fsSL "$BASE/latest")" || fail "cannot reach $BASE"
name="panegrip-relay-$os-$arch"
tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT

say "Downloading panegrip-relay ${version} for ${os}/${arch}..."
curl -fsSL "$BASE/releases/$version/$name.tar.gz" -o "$tmp/$name.tar.gz" || fail "download failed"
curl -fsSL "$BASE/releases/$version/SHA256SUMS" -o "$tmp/SHA256SUMS" || fail "checksum download failed"

expected="$(grep " $name.tar.gz\$" "$tmp/SHA256SUMS" | cut -d' ' -f1)"
if command -v sha256sum >/dev/null 2>&1; then
  actual="$(sha256sum "$tmp/$name.tar.gz" | cut -d' ' -f1)"
else
  actual="$(shasum -a 256 "$tmp/$name.tar.gz" | cut -d' ' -f1)"
fi
[ -n "$expected" ] && [ "$expected" = "$actual" ] || fail "checksum mismatch — not installing"

tar -xzf "$tmp/$name.tar.gz" -C "$tmp"
dest="${PANEGRIP_BIN_DIR:-$HOME/.local/bin}"
mkdir -p "$dest"
install -m 0755 "$tmp/panegrip-relay" "$dest/panegrip-relay"
say "Installed $dest/panegrip-relay"

case ":$PATH:" in
  *":$dest:"*) ;;
  *) say "Add $dest to your PATH to run panegrip-relay directly." ;;
esac
command -v herdr >/dev/null 2>&1 || say "Note: Herdr was not found on PATH — install it from https://herdr.dev"

[ "${PANEGRIP_NO_SERVICE:-}" = 1 ] && exit 0
"$dest/panegrip-relay" install-service

[ "${PANEGRIP_NO_PAIR:-}" = 1 ] && exit 0
i=0
until "$dest/panegrip-relay" status 2>/dev/null | grep -q "running ("; do
  i=$((i + 1)); [ "$i" -gt 30 ] && fail "the relay did not start; see ~/Library/Logs/panegrip-relay.log or journalctl --user -u panegrip-relay"
  sleep 1
done
sleep 2
"$dest/panegrip-relay" pair --wait </dev/null || true