#!/bin/sh
# Runs the archive after this script with a node that is new enough for it:
# the node on PATH, when it is; otherwise the newest one a version manager has
# installed (nvm, fnm, volta, asdf, mise, n), or bundle has downloaded
# ('bundle node install'); otherwise an error saying so.
# Nothing is installed or changed. `bundle create --launcher` sets `need` to
# the app's engines.node minimum, never below what --vfs-load needs.
need=26.11.1

# A version as four numbers, "27 1 0 1": a leading v and any +build left out,
# a missing part 0, and last 0 for a pre-release (27.1.0-rc.1), which comes
# before its release, else 1. Fails for anything that is not a version.
triple() {
    v=${1#v}; v=${v%%+*}; r=1
    case $v in *-*) r=0; v=${v%%-*} ;; esac
    case $v in ''|.*|*.|*..*|*[!0-9.]*) return 1 ;; esac
    o=$IFS; IFS=.; set -- $v; IFS=$o
    echo "${1:-0} ${2:-0} ${3:-0} $r"
}

# Whether version $1 is at least version $2.
atleast() {
    x=$(triple "$1") && y=$(triple "$2") || return 1
    set -- $x $y
    [ "$1" -ne "$5" ] && { [ "$1" -gt "$5" ]; return; }
    [ "$2" -ne "$6" ] && { [ "$2" -gt "$6" ]; return; }
    [ "$3" -ne "$7" ] && { [ "$3" -gt "$7" ]; return; }
    [ "$4" -ge "$8" ]
}

# Every node a version manager keeps under $1, in $1/<version>$2: the newest
# that is new enough is kept in `best`. Only directory names are read here.
look() {
    for d in "$1"/*/; do
        v=${d%/}; v=${v##*/}
        [ -x "$d$2" ] && atleast "$v" "$need" || continue
        [ -n "$best" ] && atleast "$bestv" "$v" && continue
        best=$d$2 bestv=$v
    done
}

node=$(command -v node) && have=$("$node" --version 2>/dev/null) && atleast "$have" "$need" || {
    best= bestv=
    data=${XDG_DATA_HOME:-$HOME/.local/share}
    look "${NVM_DIR:-$HOME/.nvm}/versions/node" bin/node
    for d in "${FNM_DIR:-$data/fnm}" "$HOME/Library/Application Support/fnm" "$HOME/.fnm"; do
        look "$d/node-versions" installation/bin/node
    done
    look "${VOLTA_HOME:-$HOME/.volta}/tools/image/node" bin/node
    look "${ASDF_DATA_DIR:-$HOME/.asdf}/installs/nodejs" bin/node
    look "${MISE_DATA_DIR:-$data/mise}/installs/node" bin/node
    look "${N_PREFIX:-/usr/local}/n/versions/node" bin/node
    look "${BUNDLE_NODE_DIR:-$data/bundle/node}" bin/node
    look "$HOME/Library/Application Support/bundle/node" bin/node
    # The directory's name is the manager's word for it; the node itself confirms.
    if [ -n "$best" ] && atleast "$("$best" --version 2>/dev/null)" "$need"; then
        node=$best
    else
        echo "${0##*/}: needs node $need or newer, and none was found" >&2
        if [ -n "$node" ]; then echo "  on PATH: node ${have:-of unknown version} at $node" >&2
        else echo "  on PATH: no node" >&2; fi
        echo "  version managers (nvm, fnm, volta, asdf, mise, n), and bundle's own: none has one installed" >&2
        echo "  install node ${need%%.*} or newer — 'bundle node install', or e.g. 'nvm install ${need%%.*}' or 'fnm install ${need%%.*}', or from https://nodejs.org — and run this again" >&2
        exit 69
    fi
}
exec "$node" --no-warnings --experimental-vfs --vfs-load="$0" -- "$@"