#!/bin/bash
# setup/lib/common.sh
#
# Shared helpers for the setup/install scripts under setup/.
# Source this file; do not execute it directly:
#
#   SETUP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
#   # shellcheck source=../lib/common.sh
#   source "$SETUP_DIR/../lib/common.sh"
#
# Conventions:
#   - The caller owns `set -euo pipefail` and PACKAGES_FILE.
#   - Package lists use @pacman (default) / @aur / @npm section markers;
#     '#' starts a comment, blank lines are ignored.
#   - Set NPM_USE_SUDO=1 before calling install_npm_pkgs when the global
#     npm root is root-owned (Arch installs npm to /usr/lib/node_modules).

# Print the repository root (setup/lib/ -> repo root).
repo_root() {
    cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd
}

log() {
    echo "==> $*"
}

# ---------------------------------------------------------------------------
# Read a packages.txt file, split into pacman / aur / npm sections.
# Usage: read_packages <file> <pacman_array> <aur_array> <npm_array>
# ---------------------------------------------------------------------------
read_packages() {
    local file="$1" pacman_ref="$2" aur_ref="$3" npm_ref="$4"
    local section="pacman"
    local line current
    local -n _pacman="$pacman_ref" _aur="$aur_ref" _npm="$npm_ref"
    while IFS= read -r line || [[ -n "$line" ]]; do
        current="${line%%#*}"
        current="${current##*( )}"
        current="${current%%*( )}"
        [[ -z "$current" ]] && continue
        case "$current" in
            @pacman) section="pacman" ;;
            @aur)    section="aur" ;;
            @npm)    section="npm" ;;
            *)
                case "$section" in
                    pacman) _pacman+=("$current") ;;
                    aur)    _aur+=("$current") ;;
                    npm)    _npm+=("$current") ;;
                esac
                ;;
        esac
    done < "$file"
}

# ---------------------------------------------------------------------------
# Install sections (arrays passed by nameref).
# ---------------------------------------------------------------------------
install_pacman_pkgs() {
    local -n _pkgs="$1"
    if ((${#_pkgs[@]})); then
        log "Installiere Pacman-Pakete: ${_pkgs[*]}"
        yay -S --needed "${_pkgs[@]}"
    fi
}

install_aur_pkgs() {
    local -n _pkgs="$1"
    if ((${#_pkgs[@]})); then
        log "Installiere AUR-Pakete: ${_pkgs[*]}"
        # --aur selects yay's AUR mode. For names that a repository package
        # can also provide, use an explicit aur/<package> target in the list.
        yay -S --aur --needed "${_pkgs[@]}"
    fi
}

install_npm_pkgs() {
    local -n _pkgs="$1"
    if ((${#_pkgs[@]})); then
        log "Installiere globale npm-Pakete: ${_pkgs[*]}"
        if [[ "${NPM_USE_SUDO:-0}" == "1" ]]; then
            sudo npm install -g "${_pkgs[@]}"
        else
            npm install -g "${_pkgs[@]}"
        fi
    fi
}

# Install all three sections at once.
install_all_pkgs() {
    install_pacman_pkgs "$1"
    install_aur_pkgs "$2"
    install_npm_pkgs "$3"
}

# ---------------------------------------------------------------------------
# Enable multilib in /etc/pacman.conf (with a safety backup).
# ---------------------------------------------------------------------------
enable_multilib() {
    sudo sed -i.bak '/^#\[multilib\]/,+1 s/^#//' /etc/pacman.conf
}

# ---------------------------------------------------------------------------
# Ensure yay (AUR helper) is installed.
# ---------------------------------------------------------------------------
ensure_yay() {
    if pacman -Q yay &>/dev/null; then
        echo "yay bereits installiert; fahre fort."
        return
    fi
    if pacman -Si yay &>/dev/null; then
        echo "Installiere yay mit pacman ..."
        sudo pacman -S --needed yay
        return
    fi
    echo "installiere yay via git ..."
    sudo pacman -S --needed base-devel git
    local tmp
    tmp="$(mktemp -d)"
    git clone https://aur.archlinux.org/yay.git "$tmp/yay"
    (
        cd "$tmp/yay"
        makepkg -si
    )
    rm -rf "$tmp"
}