#!/bin/sh
# curl -fsSL https://dl.omakasebiz.jp/cli/install.sh | sh
# The call is deliberately last: a truncated download cannot start installation.
set -eu

omakase_install() {
  base=${OMAKASE_CLI_DOWNLOAD_BASE:-https://dl.omakasebiz.jp/cli}
  install_dir=${OMAKASE_INSTALL_DIR:-$HOME/.local/bin}
  version=${OMAKASE_CLI_VERSION:-}

  die() { echo "omakase install: $*" >&2; exit 1; }
  valid_version() { printf '%s' "$1" | grep -Eq '^v?[0-9]+\.[0-9]+\.[0-9]+$'; }

  case "$(uname -s):$(uname -m)" in
    Linux:x86_64) target=x86_64-unknown-linux-gnu ;;
    *) die 'no published binary for this OS/CPU; build from source' ;;
  esac
  command -v curl >/dev/null 2>&1 || die 'curl is required'
  if command -v sha256sum >/dev/null 2>&1; then
    sha=sha256sum
  elif command -v shasum >/dev/null 2>&1; then
    sha='shasum -a 256'
  else
    die 'a SHA-256 tool is required'
  fi
  if [ -z "$version" ]; then
    version=$(curl -fsSL "${base}/latest.txt" | tr -d '\r\n')
  fi
  valid_version "$version" || die 'invalid version name'
  case "$version" in v*) ;; *) version="v$version" ;; esac

  tmp=$(mktemp -d) || die 'cannot create a temporary directory'
  trap 'rm -rf "$tmp"' EXIT HUP INT TERM
  name="omakase-${target}"
  url="${base}/${version}/${name}"
  curl -fsSL "$url" -o "$tmp/$name" || die 'binary download failed'
  curl -fsSL "${url}.sha256" -o "$tmp/$name.sha256" || die 'checksum download failed'
  expected=$(cut -d ' ' -f 1 < "$tmp/$name.sha256")
  [ "${#expected}" -eq 64 ] || die 'invalid checksum'
  actual=$($sha "$tmp/$name" | cut -d ' ' -f 1)
  [ "$actual" = "$expected" ] || die 'checksum mismatch; nothing installed'
  chmod 755 "$tmp/$name"
  mkdir -p "$install_dir"
  staged=$(mktemp "$install_dir/.omakase-install.XXXXXX") || die 'cannot stage binary'
  trap 'rm -rf "$tmp"; rm -f "$staged"' EXIT HUP INT TERM
  cp "$tmp/$name" "$staged" || die 'cannot stage binary'
  chmod 755 "$staged"
  mv -f "$staged" "$install_dir/omakase" || die 'cannot install binary'
  echo "Installed $version to $install_dir/omakase"
}

omakase_install