#!/usr/bin/env bash

# This setup script should do the minimum work required to download the release package, unzip it, and kick off the
# setup script contained within.

# exit when any command fails
set -e

if [ "$(id -u)" == "0" ]; then
   echo "This script must not be run as root" 1>&2
   exit 1
fi

check_command() {
    if ! command -v "$1" &>/dev/null; then
        echo "Please install \"$1\" and make sure it's available in your \$PATH, then rerun the setup."
        exit 1
    fi
}

check_command "curl"
check_command "gnome-shell"
check_command "jq"

ARCH=$(uname -m)
FILE_NAME="breezyGNOME-$ARCH.tar.gz"
LIBS_FILE_NAME="breezyGNOME-libs-$ARCH.tar.gz"
GNOME_VERSION=$(gnome-shell --version | cut -d' ' -f3 | cut -d'.' -f1)
VERSION_SPECIFIC_FILENAME="breezyGNOME-$GNOME_VERSION-$ARCH.tar.gz"
LATEST_RELEASE=$(curl -s "https://api.github.com/repos/wheaney/breezy-desktop/releases/latest")
if echo "$LATEST_RELEASE" | jq -e --arg filename "$VERSION_SPECIFIC_FILENAME" '.assets[] | select(.name == $filename)' > /dev/null; then
  echo "Performing setup for GNOME $GNOME_VERSION ($ARCH)"
  FILE_NAME=$VERSION_SPECIFIC_FILENAME
elif [ "$GNOME_VERSION" -lt 45 ]; then
  echo "Performing setup for GNOME 44 and below ($ARCH)"
  FILE_NAME="breezyGNOME-44-max-$ARCH.tar.gz"
else 
  echo "Performing setup for GNOME 45 and up ($ARCH)"
fi

start_dir=$(pwd)

# create temp directory
tmp_dir=$(mktemp -d -t breezy-gnome-XXXXXXXXXX)
pushd $tmp_dir > /dev/null
echo "Created temp directory: ${tmp_dir}"

binary_download_url="https://github.com/wheaney/breezy-desktop/releases/latest/download/$FILE_NAME"
libs_download_url="https://github.com/wheaney/breezy-desktop/releases/latest/download/$LIBS_FILE_NAME"
if [ "$1" = "-v" ]
then
  metrics_version="$2"
  local_dir_arg="$3"
elif [ "$1" = "--tag" ] && [ -n "$2" ]
then
  binary_download_url="https://github.com/wheaney/breezy-desktop/releases/download/$2/$FILE_NAME"
  libs_download_url="https://github.com/wheaney/breezy-desktop/releases/download/$2/$LIBS_FILE_NAME"
else
  local_dir_arg="$1"
fi

if [ -n "$local_dir_arg" ]
then
  if [[ "$local_dir_arg" = /* ]]; then
    local_dir="$local_dir_arg"
  else
    local_dir=$(realpath "$start_dir/$local_dir_arg")
  fi

  binary_path_arg="$local_dir/$FILE_NAME"
  if [ ! -f "$binary_path_arg" ]; then
    echo "Error: Breezy GNOME archive not found at $binary_path_arg" 1>&2
    exit 1
  fi

  lib_path_arg="$local_dir/$LIBS_FILE_NAME"
  if [ ! -f "$lib_path_arg" ]; then
    echo "Error: Breezy GNOME libs archive not found at $lib_path_arg" 1>&2
    exit 1
  fi
fi

if [ -z "$binary_path_arg" ]
then
  # download and unzip the binary
  binary_path_arg="$FILE_NAME"
  echo "Downloading to: ${tmp_dir}/$binary_path_arg"
  
  curl -L "$binary_download_url" > "$binary_path_arg"
else
  cp "$binary_path_arg" "$tmp_dir"
fi

echo "Extracting to: ${tmp_dir}/breezy_gnome"
tar -xf $(basename $binary_path_arg)

if [ -z "$lib_path_arg" ]
then
  lib_path_arg="$LIBS_FILE_NAME"
  echo "Downloading to: ${tmp_dir}/$lib_path_arg"

  curl -L "$libs_download_url" > "$lib_path_arg"
else
  cp "$lib_path_arg" "$tmp_dir"
fi

echo "Extracting lib to: ${tmp_dir}/breezy_gnome"
# Extract libs into the extracted directory
tar -xf $(basename $lib_path_arg)
mv breezy_desktop_lib/* breezy_gnome/

pushd breezy_gnome > /dev/null

# run the setup script that comes with this release
bin/setup $metrics_version

echo "Deleting temp directory: ${tmp_dir}"
rm -rf $tmp_dir
cd "$(dirs -l -0)" && dirs -c