#!/bin/sh
# m64 installer: curl -fsSL https://motif64.sh | sh
# Every line lives inside main(), called last, so a truncated download runs nothing.
set -eu

main() {
  site="https://motif64.sh"

  s=$(uname -s)
  m=$(uname -m)
  case "$s/$m" in
    Linux/x86_64) ;;
    Linux/aarch64 | Linux/arm64) ;;
    Darwin/*) ;;
    *)
      echo "m64 install: unsupported platform $s/$m" >&2
      exit 1
      ;;
  esac

  if ! command -v uv >/dev/null 2>&1; then
    echo "m64 install: installing uv" >&2
    curl -LsSf https://astral.sh/uv/install.sh | sh || true
    PATH="$HOME/.local/bin:$PATH"
    export PATH
    if ! command -v uv >/dev/null 2>&1; then
      echo "m64 install: could not install uv" >&2
      exit 1
    fi
  fi

  tmp=$(mktemp -d)
  trap 'rm -rf "$tmp"' EXIT
  trap 'exit 1' INT TERM HUP

  latest=$(curl -fsSL "$site/dist/latest.json" | tr -d '\n')
  version=$(printf '%s' "$latest" | sed -n 's/.*"version"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p')
  url=$(printf '%s' "$latest" | sed -n 's/.*"url"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p')
  want=$(printf '%s' "$latest" | sed -n 's/.*"sha256"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p')
  if [ -z "$version" ] || [ -z "$url" ] || [ -z "$want" ]; then
    echo "m64 install: cannot read $site/dist/latest.json" >&2
    exit 1
  fi
  bad=""
  case "$version" in
    [0-9]*) ;;
    *) bad=1 ;;
  esac
  case "$version" in
    *[!0-9A-Za-z.+-]*) bad=1 ;;
  esac
  name="m64-$version-py3-none-any.whl"
  [ "$url" = "$site/dist/$name" ] || bad=1
  case "$want" in
    *[!0-9a-f]*) bad=1 ;;
  esac
  [ "${#want}" -eq 64 ] || bad=1
  if [ -n "$bad" ]; then
    echo "m64 install: unexpected latest.json from $site" >&2
    exit 1
  fi

  wheel="$tmp/$name"
  curl -fsSL -o "$wheel" "$url"

  if [ "$s" = Darwin ]; then
    got=$(shasum -a 256 "$wheel" | cut -d ' ' -f 1)
  else
    got=$(sha256sum "$wheel" | cut -d ' ' -f 1)
  fi
  if [ "$got" != "$want" ]; then
    echo "m64 install: checksum mismatch for $url" >&2
    exit 1
  fi

  uv tool install --force "$wheel"

  bindir=$(uv tool dir --bin)
  m64bin="$bindir/m64"

  if [ "$site" != "https://motif64.sh" ]; then
    "$m64bin" config set site "$site"
  fi

  "$m64bin" doctor || echo "m64 install: m64 doctor reported problems (see above)" >&2

  case ":$PATH:" in
    *":$bindir:"*) ;;
    *) echo "m64 install: add $bindir to your PATH (or run: uv tool update-shell)" ;;
  esac

  echo "Next: m64 find"
  echo "Home: $site"
}

main "$@"