#!/bin/sh
# GO-KP radio tool installer.
#   curl gokp.click | sh
# The tool itself is always fetched over HTTPS and checked against its SHA-256.
# Installs one file, go-kp-flash, into ~/.local/bin and starts it. No root needed. Remove it by deleting that file.
set -eu

BASE_URL="${GO_KP_BASE_URL:-https://gokp.click}"
VERSION="v0.2.0, build 2026.11.10-18ebf09"
DEST_DIR="${GO_KP_INSTALL_DIR:-$HOME/.local/bin}"
DEST="$DEST_DIR/go-kp-flash"

say() { printf '%s\n' "$*"; }
fail() { printf 'Install stopped: %s\n' "$*" >&2; exit 1; }

case "$(uname -s)" in
  Linux) ;;
  *) fail "this tool runs on Linux only." ;;
esac

command -v python3 >/dev/null 2>&1 || fail "Python 3 is not installed. Install python3 and run this again."
python3 -c 'import sys; sys.exit(0 if sys.version_info >= (3, 10) else 1)' \
  || fail "Python 3.10 or newer is needed; this computer has $(python3 -c 'import sys; print(sys.version.split()[0])')."

if command -v curl >/dev/null 2>&1; then
  fetch() { curl -fsSL "$1" -o "$2"; }
elif command -v wget >/dev/null 2>&1; then
  fetch() { wget -q "$1" -O "$2"; }
else
  fail "neither curl nor wget is installed."
fi
command -v sha256sum >/dev/null 2>&1 || fail "sha256sum is not installed."

WORK=$(mktemp -d)
trap 'rm -rf "$WORK"' EXIT INT TERM

say "Downloading the GO-KP radio tool ($VERSION)..."
fetch "$BASE_URL/go-kp-flash.pyz" "$WORK/go-kp-flash.pyz" || fail "could not download the tool from $BASE_URL."
fetch "$BASE_URL/go-kp-flash.pyz.sha256" "$WORK/expected" || fail "could not download the checksum from $BASE_URL."

EXPECTED=$(cut -d' ' -f1 "$WORK/expected")
ACTUAL=$(sha256sum "$WORK/go-kp-flash.pyz" | cut -d' ' -f1)
[ -n "$EXPECTED" ] && [ "$EXPECTED" = "$ACTUAL" ] || fail "the download does not match its checksum. Nothing was installed."

python3 "$WORK/go-kp-flash.pyz" --version >/dev/null 2>&1 || fail "the downloaded tool does not run on this computer."

mkdir -p "$DEST_DIR"
cp "$WORK/go-kp-flash.pyz" "$DEST.new"
chmod 755 "$DEST.new"
mv "$DEST.new" "$DEST"

say "Installed: $DEST"
if ! python3 -c 'import ctypes.util, sys; sys.exit(0 if ctypes.util.find_library("usb-1.0") else 1)' 2>/dev/null; then
  say "Note: libusb-1.0 was not found. The tool needs it to talk to a radio."
  say "  Debian/Ubuntu: sudo apt install libusb-1.0-0     Fedora: sudo dnf install libusb1"
fi
case ":$PATH:" in
  *":$DEST_DIR:"*) AGAIN="go-kp-flash" ;;
  *) AGAIN="$DEST" ;;
esac
say "To start it again later, type:  $AGAIN"
say "If it cannot reach the radio, start it with sudo in front."

# Start it now. The script arrived through a pipe, so the tool reads the keyboard from the terminal itself.
# Set GO_KP_NO_RUN=1 to install without starting it.
if [ -z "${GO_KP_NO_RUN:-}" ] && [ -t 1 ] && ( : </dev/tty ) 2>/dev/null; then
  rm -rf "$WORK"
  trap - EXIT INT TERM
  say ""
  exec "$DEST" </dev/tty
fi