#!/usr/bin/env bash

# Author: Imbus
# License: 0BSD
# See: https://github.com/winder/Universal-G-Code-Sender/releases

# VERSION="2.1.14"
VERSION=$(curl -s https://api.github.com/repos/winder/Universal-G-Code-Sender/releases/latest | jq -r '.tag_name' | sed 's/^v//')

if [ -z "$VERSION" ]; then
  echo "Error: Failed to fetch version tag."
  exit 1
fi

UGS_URL=https://github.com/winder/Universal-G-Code-Sender/releases/download/v${VERSION}/linux-x64-ugs-platform-app-${VERSION}.tar.gz
UGS_FILE=$(basename "$UGS_URL")

CURL_CMD="curl -# --fail --location --tlsv1.2 --proto =https --max-time 300"
CACHE_PATH="$HOME/Downloads"

set -e

# Download file if missing.
# Usage: get "https://example.com/file.txt"
# @param string url The URL to download
# @param string path [Optional] The target path without trailing slash
get() {
  local url="$1"
  local filename
  local cdate

  filename=$(basename "$url")

  # If $2 is a valid path, prepend it to the filename
  # Otherwise, use the basename of the URL
  if [ -n "$2" ]; then
    filename="$2/$filename"
  fi

  # If url is empty or improperly formatted, bail out.
  # Yes, this regex is a mouthful, but it's better than nothing.
  if [[ ! "$url" =~ ^https?://[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}(/.*)?$ ]]; then
    echo "Invalid URL: $url"
    return 1 # Error
  fi

  trap 'rm -f "$filename"; exit 1' EXIT SIGINT SIGTERM # Clean up file on exit

  if [ ! -f "$filename" ]; then
    echo "Downloading $filename"
    $CURL_CMD -# -o "$filename" "$url" || exit 1
    return 0
  else
    cdate=$(date -r "$filename" +%s)
    echo "Already downloaded on $(date -I -d "@$cdate"): $filename"
    return 0
  fi
}

filepath="$CACHE_PATH/$UGS_FILE"

# If first argument is clean, remove downloaded files and exit
if [ "$1" = "clean" ]; then
  echo "Cleaning up..."
  rm -f "$filepath"
  rm -f ~/.local/share/icons/hicolor/scalable/apps/universal-g-code-sender.svg
  rm -f ~/.local/share/applications/universal-g-code-sender.desktop
  rm -rf ~/.local/share/ugsplatform*
  exit 0
fi

get "$UGS_URL" "$CACHE_PATH"

tar -C ~/.local/share/ -xf "$filepath"

mkdir -p ~/.local/share/icons/hicolor/scalable/apps/
cp ~/.local/share/ugsplatform-linux-x64/bin/icon.svg ~/.local/share/icons/hicolor/scalable/apps/universal-g-code-sender.svg

# Define the .desktop file content as a variable
desktop_file_content=$(
  cat <<EOF
[Desktop Entry]
Version=1.0
Type=Application
Name=Universal G-Code Sender
Comment=Open-source G-Code sender for CNC machines
Exec=$HOME/.local/share/ugsplatform-linux-x64/bin/ugsplatform
Icon=universal-g-code-sender
Terminal=false
Categories=Development;Graphics;
EOF
)

# Write the .desktop file to the correct location
mkdir -p ~/.local/share/applications
echo "$desktop_file_content" >~/.local/share/applications/universal-g-code-sender.desktop

# Make the .desktop file executable
chmod +x ~/.local/share/applications/universal-g-code-sender.desktop

echo "Completed!"