#!/bin/sh
# script/bootstrap: install all dependencies needed to build and develop
# this repo. Idempotent: every install is guarded by a check so already
# installed tools are skipped. Base tooling comes from nix, apt, brew,
# or apk (detected in that order); assumes nothing is present.
# goimports is not installed here: script/fmt and script/fmt-check-go
# run it with `go run` at a pinned commit.
# The linter is NOT installed here: golangci-lint runs via docker only
# (script/lint), pinned by image digest, so its only prerequisite is a
# working docker. Nor is prettier: script/fmt and
# script/fmt-check-markdown run it in a container from Dockerfile.fmt.
set -eu

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

PKGMGR=""
SUDO=""
APT_UPDATED=""

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
    fi
}

# pkg_install <nix-attr> <apt-pkg> <brew-formula> <apk-pkg>
pkg_install() {
    detect_pkgmgr
    case "$PKGMGR" in
        nix) nix-env -iA "nixpkgs.$1" ;;
        apt)
            if [ -z "$APT_UPDATED" ]; then
                $SUDO env DEBIAN_FRONTEND=noninteractive apt-get update
                APT_UPDATED=1
            fi
            $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"

    if missing git; then pkg_install git git git git; fi
    if missing make; then pkg_install gnumake make make make; fi
    if missing go; then pkg_install go golang go go; fi

    # Linting and the markdown formatter run via docker only. Warn,
    # don't fail: building and testing work without it.
    if missing docker; then
        echo "bootstrap: WARNING: docker not found; install it to" \
            "run make lint, make fmt, make fmt-check, make check" \
            "and make docker." >&2
    fi

    go mod download

    echo "bootstrap complete"
}

main "$@"