#!/usr/bin/env sh
# lib/fetch.sh — helpers for installing userland binaries into ~/.local/bin.
#
# Everything lands under $HOME, so installed tools survive Kasm redeploys
# (which wipe the root filesystem but keep $HOME) with no reinstall needed.
# No sudo, no system packages. Prefer statically linked release binaries so
# they keep working even after the root fs — and its shared libraries — is
# reset.
#
# Source this (callers already run `set -eu`), then use fetch_arch /
# fetch_arch_deb, have_version + mark_version, install_tarball_bin, and
# install_raw_bin.

BIN_DIR="${BIN_DIR:-$HOME/.local/bin}"
VERSION_DIR="$BIN_DIR/.versions"

fsay() { printf '%s\n' "$*" >&2; }

# Normalize `uname -m` to the tokens rust-style release names use.
fetch_arch() {
  case "$(uname -m)" in
    x86_64|amd64) printf 'x86_64\n' ;;
    aarch64|arm64) printf 'aarch64\n' ;;
    *) fsay "fetch: unsupported arch $(uname -m)"; return 1 ;;
  esac
}

# Same, but in the Go/Debian token style most devops tools use.
fetch_arch_deb() {
  case "$(uname -m)" in
    x86_64|amd64) printf 'amd64\n' ;;
    aarch64|arm64) printf 'arm64\n' ;;
    *) fsay "fetch: unsupported arch $(uname -m)"; return 1 ;;
  esac
}

# Download <url> to <dest-file> using whatever downloader is available.
_fetch_dl() {
  if command -v curl >/dev/null 2>&1; then
    curl -fsSL "$1" -o "$2"
  elif command -v wget >/dev/null 2>&1; then
    wget -qO "$2" "$1"
  else
    fsay "fetch: need curl or wget"; return 1
  fi
}

# have_version <name> <version> — true if <name> is installed and was
# stamped at <version>, so bootstrap can skip a re-download. Versions are
# recorded in ~/.local/bin/.versions rather than parsed from each tool's
# `--version` output, which varies wildly (kubectl/helm/k9s have no uniform
# flag).
have_version() {
  [ -x "$BIN_DIR/$1" ] && [ -f "$VERSION_DIR/$1" ] &&
    [ "$(cat "$VERSION_DIR/$1")" = "$2" ]
}

# mark_version <name> <version> — record the installed version.
mark_version() {
  mkdir -p "$VERSION_DIR"
  printf '%s\n' "$2" >"$VERSION_DIR/$1"
}

# install_tarball_bin <url> <path-within-archive> <dest-name> — download a
# .tar.gz, extract, and install one binary from it into ~/.local/bin.
install_tarball_bin() {
  mkdir -p "$BIN_DIR"
  _tmp="$(mktemp -d)"
  _fetch_dl "$1" "$_tmp/archive.tar.gz"
  tar -xzf "$_tmp/archive.tar.gz" -C "$_tmp"
  install -m 0755 "$_tmp/$2" "$BIN_DIR/$3"
  rm -rf "$_tmp"
  fsay "installed $BIN_DIR/$3"
}

# install_raw_bin <url> <dest-name> — download a single raw binary.
install_raw_bin() {
  mkdir -p "$BIN_DIR"
  _tmp="$(mktemp)"
  _fetch_dl "$1" "$_tmp"
  install -m 0755 "$_tmp" "$BIN_DIR/$2"
  rm -f "$_tmp"
  fsay "installed $BIN_DIR/$2"
}