#!/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. Go is
# installed at the version the Dockerfile's Go image carries, from the
# official release archive, into ~/.local/go, and then the Go modules.
# Node is used directly if installed; otherwise it is installed at a
# pinned version via nvm (installing nvm itself first, from a
# hash-verified release archive, never curl | sh).
set -eu

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

# Must match the Go in the Dockerfile's golang image; the sha256 of each
# archive is in install_go.
GO_VERSION="1.27.3"

# This script cannot change its caller's PATH, so script/fmt,
# script/fmt-check and script/build put this directory first on their
# own PATH, as is done here.
GO_DIR="$HOME/.local/go"
PATH="$GO_DIR/bin:$PATH"

# Pinned versions, 2026-07-06
NODE_VERSION="22.17.0"
NVM_VERSION="0.40.3"
# sha256 of https://github.com/nvm-sh/nvm/archive/refs/tags/v0.40.3.tar.gz
NVM_SHA256="5f4d6aaa04a177dc93c985e31dbc411ab6b8c6e1e21d8015dbc1372625fcd1d0"
YARN_VERSION="1.22.22"

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
        # This runs once, before the first install: a fresh host or
        # runner image has no package lists yet.
        $SUDO 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
}

# verify_sha256 <file> <expected-hash>
verify_sha256() {
    if command -v sha256sum >/dev/null 2>&1; then
        actual="$(sha256sum "$1" | cut -d' ' -f1)"
    else
        actual="$(shasum -a 256 "$1" | cut -d' ' -f1)"
    fi
    if [ "$actual" != "$2" ]; then
        echo "bootstrap: sha256 mismatch for $1" >&2
        echo "  expected: $2" >&2
        echo "  actual:   $actual" >&2
        exit 1
    fi
}

# True when the go first on PATH reports exactly GO_VERSION. No go, a go
# that fails, or any other output is a mismatch.
go_version_matches() {
    out="$(go version 2>/dev/null)" || return 1
    case "$out" in
        "go version go$GO_VERSION "*) return 0 ;;
        *) return 1 ;;
    esac
}

install_go() {
    # sha256 of the go1.27.3 archives at https://go.dev/dl/, 2026-11-02
    case "$(uname -s)-$(uname -m)" in
        Linux-x86_64)
            platform="linux-amd64"
            sha256="65efbc80fdc1fa2cd2631cad5b481777a68e8725f34e89f50fc6ac714e379b40"
            ;;
        Linux-aarch64)
            platform="linux-arm64"
            sha256="a06e99309dbcbdca1a8ccd2282c3ee146e55930886e26b4f1193269587165f49"
            ;;
        Darwin-x86_64)
            platform="darwin-amd64"
            sha256="b6f8e931e4ab497fcde6da8ae4499a58f9d258e55c8a80824a516eae5950a750"
            ;;
        Darwin-arm64)
            platform="darwin-arm64"
            sha256="dd3908cf20959d798c1e06ebe5b72213f0505ce01373b40ce3110975a6cd99c2"
            ;;
        *)
            echo "bootstrap: no Go archive pinned for $(uname -s) $(uname -m)" >&2
            exit 1
            ;;
    esac
    if missing curl; then pkg_install curl curl curl curl; fi
    tmp="$(mktemp -d)"
    curl -fsSL -o "$tmp/go.tar.gz" \
        "https://go.dev/dl/go${GO_VERSION}.${platform}.tar.gz"
    verify_sha256 "$tmp/go.tar.gz" "$sha256"
    # An archive unpacked over an older Go leaves a broken tree.
    rm -rf "$GO_DIR"
    mkdir -p "$GO_DIR"
    tar -xzf "$tmp/go.tar.gz" -C "$GO_DIR" --strip-components=1
    rm -rf "$tmp"
}

# nvm is a bash script; run a command in a bash with nvm loaded
nvm_sh() {
    bash -c ". \"\$HOME/.nvm/nvm.sh\" && $*"
}

ensure_nvm() {
    [ -s "$HOME/.nvm/nvm.sh" ] && return 0
    # nvm prerequisites; nvm itself requires bash
    if missing bash; then pkg_install bash bash bash bash; fi
    if missing curl; then pkg_install curl curl curl curl; fi
    if missing git; then pkg_install git git git git; fi
    tmp="$(mktemp -d)"
    curl -fsSL -o "$tmp/nvm.tar.gz" \
        "https://github.com/nvm-sh/nvm/archive/refs/tags/v${NVM_VERSION}.tar.gz"
    verify_sha256 "$tmp/nvm.tar.gz" "$NVM_SHA256"
    mkdir -p "$HOME/.nvm"
    tar -xzf "$tmp/nvm.tar.gz" -C "$HOME/.nvm" --strip-components=1
    rm -rf "$tmp"
}

ensure_node() {
    if ! missing node; then return 0; fi
    ensure_nvm
    nvm_sh "nvm install $NODE_VERSION"
}

ensure_yarn() {
    if ! missing yarn; then return 0; fi
    if ! missing corepack; then
        corepack enable
        corepack prepare "yarn@$YARN_VERSION" --activate
    elif [ -s "$HOME/.nvm/nvm.sh" ]; then
        nvm_sh "nvm use $NODE_VERSION >/dev/null && corepack enable && \
            corepack prepare yarn@$YARN_VERSION --activate"
    else
        npm install -g "yarn@$YARN_VERSION"
    fi
}

install_js_deps() {
    if missing yarn && [ -s "$HOME/.nvm/nvm.sh" ]; then
        nvm_sh "nvm use $NODE_VERSION >/dev/null && cd \"$ROOT\" && \
            yarn install --frozen-lockfile"
    else
        yarn install --frozen-lockfile
    fi
}

main() {
    cd "$ROOT"

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

    if ! go_version_matches; then
        install_go
        hash -r
        if ! go_version_matches; then
            echo "bootstrap: $(command -v go) is not go$GO_VERSION after installing it" >&2
            exit 1
        fi
    fi
    go version

    go mod download

    ensure_node
    ensure_yarn
    install_js_deps

    echo "bootstrap complete"
}

main "$@"