#!/usr/bin/env bash
# Zagan-Bet desktop installer for Linux.
#
# Verifies the app against its published SHA-256, installs it for the current
# user and adds a launcher. Put the downloaded app next to this script, or run
# the script on its own and it will fetch the matching binary.
set -euo pipefail

VERSION="__VERSION__"
BINARY="__BINARY__"
SHA256="__SHA256__"
URL="__URL__"

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

command -v sha256sum >/dev/null 2>&1 || die "sha256sum is required"

here=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
source_file=""
for candidate in "$here/$BINARY" "./$BINARY" "$HOME/Downloads/$BINARY"; do
  if [ -f "$candidate" ]; then
    source_file=$candidate
    break
  fi
done

cleanup=""
if [ -z "$source_file" ]; then
  command -v curl >/dev/null 2>&1 || die "put $BINARY next to this installer, or install curl"
  cleanup=$(mktemp) || die "cannot create a temporary file"
  say "Downloading $BINARY..."
  curl -fsSL --max-time 300 "$URL" -o "$cleanup" || die "download failed"
  source_file=$cleanup
fi
trap 'if [ -n "$cleanup" ]; then rm -f "$cleanup"; fi' EXIT

actual=$(sha256sum "$source_file" | awk '{print $1}')
[ "$actual" = "$SHA256" ] || die "checksum mismatch: expected $SHA256, got $actual"

bin_dir="${XDG_BIN_HOME:-$HOME/.local/bin}"
data_dir="${XDG_DATA_HOME:-$HOME/.local/share}"
app="$bin_dir/zagan-bet-gui"
desktop_dir="$data_dir/applications"
icon_dir="$data_dir/icons/hicolor/scalable/apps"

mkdir -p "$bin_dir" "$desktop_dir" "$icon_dir"
install -m 0755 "$source_file" "$app"

cat > "$icon_dir/zagan-bet.svg" <<'ICON'
__ICON__
ICON

cat > "$desktop_dir/zagan-bet.desktop" <<DESKTOP
[Desktop Entry]
Type=Application
Name=Zagan-Bet
Comment=Slots, roulette, blackjack and crash
Exec=$app
Icon=zagan-bet
Terminal=false
Categories=Game;
DESKTOP
chmod 0644 "$desktop_dir/zagan-bet.desktop" "$icon_dir/zagan-bet.svg"

if command -v update-desktop-database >/dev/null 2>&1; then
  update-desktop-database "$desktop_dir" >/dev/null 2>&1 || true
fi
if command -v gtk-update-icon-cache >/dev/null 2>&1; then
  gtk-update-icon-cache -q "$data_dir/icons/hicolor" >/dev/null 2>&1 || true
fi

say "Installed Zagan-Bet $VERSION to $app"
say "A launcher was added to your applications menu."
case ":$PATH:" in
  *":$bin_dir:"*) ;;
  *) say "Add $bin_dir to PATH to start it as 'zagan-bet-gui'." ;;
esac