#!/usr/bin/env bash
# ===========================================================================
#  Distribution Detection & Common Variables
#  Sourced by 00-envcheck.sh, then available to all subsequent stages.
#
#  After sourcing this, use these variables instead of hardcoding commands:
#    $PKG_INSTALL <packages>      — Install packages
#    $PKG_UPDATE                  — Update package cache
#    $PKG_REMOVE <packages>       — Remove packages
#    $PKG_GROUP_INSTALL <group>   — Install package group
#    $DISTRO_FAMILY               — "debian" or "fedora"
#    $DISTRO_ID                   — "pop", "ubuntu", "fedora", etc.
#    $DISTRO_VERSION              — "24.04", "41", etc.
#  See full list below.
# ===========================================================================

# ---- Detect distribution ----
DISTRO_ID=""
DISTRO_VERSION=""
DISTRO_FAMILY=""   # "debian" (apt) or "fedora" (dnf)
DISTRO_LIKE=""     # from ID_LIKE in os-release

if [ -f /etc/os-release ]; then
  . /etc/os-release
  DISTRO_ID="$ID"
  DISTRO_VERSION="$VERSION_ID"
  DISTRO_LIKE="$ID_LIKE"
fi

# ---- Determine distro family ----
case "$DISTRO_ID" in
  fedora|rhel|centos)
    DISTRO_FAMILY="fedora"
    ;;
  pop|ubuntu|debian|linuxmint|elementary|zorin)
    DISTRO_FAMILY="debian"
    ;;
  *)
    # Fall back to ID_LIKE
    case "$DISTRO_LIKE" in
      *fedora*) DISTRO_FAMILY="fedora" ;;
      *debian*) DISTRO_FAMILY="debian" ;;
      *) DISTRO_FAMILY="unknown" ;;
    esac
    ;;
esac

# ---- Fail early on unknown distro ----
if [ "$DISTRO_FAMILY" = "unknown" ]; then
  echo "[ERROR] Unknown distribution: $DISTRO_ID (ID_LIKE=$DISTRO_LIKE)"
  echo "        Edit lib/distro.sh to add support."
  exit 1
fi

# ===========================================================================
#  Package Manager Commands
# ===========================================================================
if [ "$DISTRO_FAMILY" = "debian" ]; then
  PKG_MGR="apt"
  PKG_UPDATE="sudo apt update"
  PKG_INSTALL="sudo apt install -y"
  PKG_INSTALL_NO_REC="sudo apt install -y --no-install-recommends"
  PKG_REMOVE="sudo apt remove -y"
  PKG_PURGE="sudo apt purge -y"
  PKG_AUTOREMOVE="sudo apt autoremove -y"
  PKG_SEARCH="apt search"
  PKG_LIST_INSTALLED="dpkg -l"

  # Repo management
  REPO_ADD_PPA="sudo add-apt-repository -y"
  REPO_APT_KEY="sudo apt-key add -"       # legacy, use signed-by when possible
  REPO_ADD_LIST="sudo tee /etc/apt/sources.list.d"

  # Service / boot
  SERVICE_ENABLE="sudo systemctl enable --now"
  GRUB_UPDATE="sudo update-grub"
  GRUB_FILE="/etc/default/grub"

  # Desktop environment detection
  # Pop uses COSMIC; Ubuntu uses GNOME; Kubuntu uses KDE
  case "$DISTRO_ID" in
    pop) DEFAULT_DE="COSMIC" ;;
    ubuntu|debian) DEFAULT_DE="GNOME" ;;
    *) DEFAULT_DE="" ;;  # unknown
  esac

elif [ "$DISTRO_FAMILY" = "fedora" ]; then
  PKG_MGR="dnf"
  PKG_UPDATE="sudo dnf makecache"
  PKG_INSTALL="sudo dnf install -y"
  PKG_INSTALL_NO_REC="sudo dnf install -y"   # dnf has no --no-install-recommends equivalent
  PKG_REMOVE="sudo dnf remove -y"
  PKG_PURGE="sudo dnf remove -y"
  PKG_AUTOREMOVE="sudo dnf autoremove -y"
  PKG_SEARCH="dnf search"
  PKG_LIST_INSTALLED="dnf list installed"

  # Repo management
  REPO_ADD_COPR="sudo dnf copr enable -y"
  REPO_ADD_RPM="sudo dnf config-manager --add-repo"

  # Service / boot
  SERVICE_ENABLE="sudo systemctl enable --now"
  GRUB_UPDATE="sudo grub2-mkconfig -o /boot/grub2/grub.cfg"
  GRUB_EFI_UPDATE="sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg"
  GRUB_FILE="/etc/default/grub"

  # Desktop environment detection
  DEFAULT_DE="GNOME"   # Fedora Workstation defaults to GNOME
fi

# ===========================================================================
#  Helper function: install package(s), silently skip if already installed
# ===========================================================================
pkg_install() {
  if [ "$DISTRO_FAMILY" = "debian" ]; then
    sudo apt install -y "$@" 2>/dev/null || return 1
  else
    sudo dnf install -y "$@" 2>/dev/null || return 1
  fi
}

# Wrapper for group installs (ignored on apt systems)
pkg_group_install() {
  if [ "$DISTRO_FAMILY" = "fedora" ]; then
    sudo dnf group install -y "$@" 2>/dev/null || return 1
  else
    # On Debian, groups aren't a thing — just skip
    return 0
  fi
}

# ===========================================================================
#  Package Name Mappings (Debian → Fedora and vice versa)
#  Usage: pkg_name_fedora="foo" pkg_name_debian="bar"
#         pkg_name "$pkg_name_fedora" "$pkg_name_debian"
#  Or use the shorthand below for known differences.
# ===========================================================================

# Known package name differences
resolve_pkg() {
  local debian_name="$1"
  local fedora_name="$2"
  if [ "$DISTRO_FAMILY" = "debian" ]; then
    echo "$debian_name"
  else
    echo "$fedora_name"
  fi
}

# Convenience: install a package that may have different names
pkg_install_mapped() {
  local debian_name="$1"
  local fedora_name="$2"
  if [ "$DISTRO_FAMILY" = "debian" ]; then
    pkg_install "$debian_name"
  else
    pkg_install "$fedora_name"
  fi
}

# Export all variables so sourced stages can use them
export DISTRO_FAMILY DISTRO_ID DISTRO_VERSION DISTRO_LIKE
export PKG_MGR PKG_UPDATE PKG_INSTALL PKG_INSTALL_NO_REC
export PKG_REMOVE PKG_PURGE PKG_AUTOREMOVE
export PKG_SEARCH PKG_LIST_INSTALLED
export SERVICE_ENABLE GRUB_UPDATE GRUB_EFI_UPDATE GRUB_FILE
export DEFAULT_DE

# Export helpers
export -f pkg_install pkg_group_install pkg_install_mapped resolve_pkg