#!/bin/sh
# script/bootstrap: install all dependencies needed to build and develop
# this Hugo site, idempotently. Base tooling comes from nix, apt, brew,
# or apk (detected in that order); assumes NOTHING is present (not git,
# make, hugo, or node). Installs hugo (the site build) and node/npm
# (prettier, used to format the repo's own markdown docs). Every install
# is guarded by a check so already-installed tools are skipped.
set -eu

ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"

PKGMGR=""
SUDO=""

detect_pkgmgr() {
    [ -n "$PKGMGR" ] && return 0
    if command -v nix-env >/dev/null 2>&1; then
        PKGMGR="nix"
    elif command -v apt-get >/dev/null 2>&1; then
        PKGMGR="apt"
    elif command -v brew >/dev/null 2>&1; then
        PKGMGR="brew"
    elif command -v apk >/dev/null 2>&1; then
        PKGMGR="apk"
    else
        echo "bootstrap: no supported package manager (nix, apt, brew, apk)" >&2
        exit 1
    fi
    if [ "$PKGMGR" = "apt" ]; then
        export DEBIAN_FRONTEND=noninteractive
        if [ "$(id -u)" != "0" ]; then
            SUDO="sudo"
        fi
        $SUDO env DEBIAN_FRONTEND=noninteractive apt-get update
    fi
}

# pkg_install <nix-attr> <apt-pkg> <brew-formula> <apk-pkg>
pkg_install() {
    detect_pkgmgr
    case "$PKGMGR" in
        nix) nix-env -iA "nixpkgs.$1" ;;
        apt) $SUDO env DEBIAN_FRONTEND=noninteractive apt-get install -y "$2" ;;
        brew) brew install "$3" ;;
        apk) apk add --no-cache "$4" ;;
    esac
}

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

main() {
    cd "$ROOT"

    # Base tooling.
    if missing git; then pkg_install git git git git; fi
    if missing make; then pkg_install gnumake make make make; fi

    # The theme is vendored in-repo, but initialise submodules if any
    # are ever added so a fresh clone is buildable.
    if [ -f .gitmodules ]; then
        git submodule update --init --recursive
    fi

    # Site build.
    if missing hugo; then pkg_install hugo hugo hugo hugo; fi

    # node/npm provide prettier (via npx) for formatting the docs.
    if missing node; then pkg_install nodejs nodejs node nodejs; fi
    if missing npx; then pkg_install nodejs npm npm npm; fi

    echo "bootstrap complete"
}

main "$@"