#!/bin/bash
set -u

# Step 0: WebKitGTK 6 runtime ...................................................
# The release binary dynamically links libwebkitgtk-6.0 and libgtk-4, which are
# not preinstalled on most distros and are not shipped in the tarball. Install
# them first so the app can start; abort before copying anything otherwise.
#
# OS_RELEASE_FILE override exists for testing the distro mapping only.

print_manual_instructions() {
  cat >&2 <<'EOF'
Install the WebKitGTK 6 runtime for your distribution, then re-run this script:
  Arch / Manjaro / EndeavourOS:  sudo pacman -S webkitgtk-6.0
  Debian / Ubuntu / Mint / Pop:  sudo apt install libwebkitgtk-6.0-4
  Fedora / Nobara:               sudo dnf install webkitgtk6.0
  OpenMandriva:                  sudo dnf install lib64webkit2gtk6.0
  Void (glibc):                  sudo xbps-install -S libwebkitgtk60
Without it the app fails at launch: error while loading shared libraries: libwebkitgtk-6.0.so.4
EOF
}

install_webkit_runtime() {
  # 0a. musl guard: the prebuilt binary is glibc-linked and cannot run on
  # musl systems (Alpine, Void-musl). No package fixes that — refuse loudly.
  if ldd --version 2>&1 | grep -qi musl; then
    echo "ERROR: AniTrack ships a glibc-linked binary, but this system uses musl libc." >&2
    echo "The prebuilt release cannot run here. Build from source instead (see README)." >&2
    return 1
  fi

  # 0b. Every package manager below needs privilege.
  local sudo_cmd=""
  if [ "$(id -u)" -ne 0 ]; then
    if ! command -v sudo >/dev/null 2>&1; then
      echo "ERROR: root privileges are required to install system packages," >&2
      echo "but sudo is not available. Install the WebKitGTK 6 runtime manually:" >&2
      print_manual_instructions
      return 1
    fi
    sudo_cmd="sudo"
  fi

  # 0c. Distro mapping. ID_LIKE catches derivatives (Mint/Pop -> ubuntu,
  # Manjaro/EndeavourOS -> arch, Nobara -> fedora) without enumerating them.
  local os_release="${OS_RELEASE_FILE:-/etc/os-release}"
  local dist_id="" dist_like=""
  if [ -r "$os_release" ]; then
    # shellcheck disable=SC1090
    . "$os_release"
    dist_id="${ID:-}"
    dist_like="${ID_LIKE:-}"
  fi

  need_cmd() {
    command -v "$1" >/dev/null 2>&1
  }

  local ids=" ${dist_id} ${dist_like} "
  case "$ids" in
    *" arch "*|*" manjaro "*|*" endeavouros "*|*" garuda "*|*" cachyos "*)
      need_cmd pacman || { echo "ERROR: pacman not found on Arch-family system." >&2; return 1; }
      $sudo_cmd pacman -S --needed --noconfirm webkitgtk-6.0 || return 1
      ;;
    *" debian "*|*" ubuntu "*|*" pop "*|*" linuxmint "*)
      need_cmd apt-get || { echo "ERROR: apt-get not found on Debian-family system." >&2; return 1; }
      $sudo_cmd apt-get update && $sudo_cmd apt-get install -y libwebkitgtk-6.0-4 || return 1
      ;;
    *" fedora "*|*" nobara "*)
      need_cmd dnf || { echo "ERROR: dnf not found on Fedora-family system." >&2; return 1; }
      $sudo_cmd dnf install -y webkitgtk6.0 || return 1
      ;;
    *" openmandriva "*)
      need_cmd dnf || { echo "ERROR: dnf not found on OpenMandriva system." >&2; return 1; }
      $sudo_cmd dnf install -y lib64webkit2gtk6.0 || return 1
      ;;
    *" void "*)
      need_cmd xbps-install || { echo "ERROR: xbps-install not found on Void system." >&2; return 1; }
      $sudo_cmd xbps-install -Sy libwebkitgtk60 || return 1
      ;;
    *" alpine "*)
      echo "ERROR: Alpine Linux uses musl libc, which the prebuilt glibc-linked binary cannot run on." >&2
      echo "Build from source instead (see README)." >&2
      return 1
      ;;
    *)
      echo "ERROR: unsupported or unrecognised distribution (ID='${dist_id}' ID_LIKE='${dist_like}')." >&2
      print_manual_instructions
      return 1
      ;;
  esac
  unset -f need_cmd
}

install_webkit_runtime || exit 1

# copy desktop file
if [ ! -f "$HOME/.local/share/applications/AniTrack.desktop" ]; then
  if [ -d "~/.local/share/applications/" ]; then
    echo "Copying desktop file..."
    cp ./AniTrack.desktop ~/.local/share/applications/
  else
    mkdir -p ~/.local/share/applications/
    echo "Copying desktop file..."
    cp ./AniTrack.desktop ~/.local/share/applications/
  fi
else
  echo "Desktop file already installed..."
fi

# copy icons to xdg folders
for size in 32 48 64 128; do
  if [ ! -f $HOME/.local/share/icons/hicolor/${size}x${size}/apps/AniTrack.png ]; then
    echo "Installing ${size} icon size..."
    xdg-icon-resource install --novendor --context apps --size $size ./icon/$size/AniTrack.png AniTrack
  else
    echo "${size} icon size already exists..."
  fi
done

# copy AniTrack Binary to $HOME/Applications/
if ! [ -d "$HOME/Applications" ]; then
  mkdir -p ~/Applications
  echo "Installing app to ~/Applications..."
  cp ./bin/AniTrack ~/Applications/
elif ! [[ -e $HOME/Applications/AniTrack ]]; then
  echo "Installing app to ~/Applications"
  cp ./bin/AniTrack ~/Applications/
else
  echo "AniTrack already in Applications..."
fi

echo "AniTrack has been successfully installed."