#!/bin/sh
set -eu
retry_max=5
base=${RTME_INSTALL_BASE_URL:-https://rtme.sh/send}
os=$(uname -s | tr '[:upper:]' '[:lower:]')
arch=$(uname -m)
case "$arch" in x86_64|amd64) arch=x64 ;; aarch64|arm64) arch=arm64 ;; *) echo "error: unsupported arch: $arch" >&2; exit 1 ;; esac
case "$os" in darwin|linux) ;; *) echo "error: unsupported OS: $os" >&2; exit 1 ;; esac
bin=rtme.sh
url="${base}/install.bin?os=${os}&arch=${arch}"
retry() {
  attempt=$1 phase=$2 detail=$3
  [ "$attempt" -lt "$retry_max" ] || return 1
  echo "→ retrying $phase ($((attempt + 1))/$retry_max): $detail" >&2
  sleep "$attempt"
}
probe_status() { curl -sSLI -o /dev/null -w '%{http_code}' "$1" 2>/dev/null || printf 000; }
attempt=1
while :; do
  meta=$(curl -sSLI -w '
http_code: %{http_code}
url_effective: %{url_effective}
' "$url" | tr -d '
') || {
    code=$?
    retry "$attempt" "metadata lookup" "curl exit $code" || { echo "error: failed to check installer release metadata" >&2; exit 1; }
    attempt=$((attempt + 1))
    continue
  }
  status=$(printf '%s
' "$meta" | sed -n 's/^http_code: //p' | tail -n 1)
  case "$status" in
    2??|3??) break ;;
    404) echo "error: no binary for ${os}/${arch}" >&2; exit 1 ;;
    5??) retry "$attempt" "metadata lookup" "HTTP ${status}" || { echo "error: failed to check installer release metadata (HTTP ${status})" >&2; exit 1; }; attempt=$((attempt + 1)); continue ;;
    4??) echo "error: failed to check installer release metadata (HTTP ${status})" >&2; exit 1 ;;
    *) retry "$attempt" "metadata lookup" "HTTP ${status:-000}" || { echo "error: failed to check installer release metadata" >&2; exit 1; }; attempt=$((attempt + 1)); continue ;;
  esac
done
version=$(printf '%s
' "$meta" | sed -n 's/^[Xx]-[Rr][Tt][Mm][Ee]-[Vv][Ee][Rr][Ss][Ii][Oo][Nn]: //p' | head -n 1)
[ "$version" ] || { echo "error: failed to check installer release metadata" >&2; exit 1; }
final_url=$(printf '%s
' "$meta" | sed -n 's/^url_effective: //p' | tail -n 1)
total=$(printf '%s
' "$meta" | sed -n 's/^[Cc][Oo][Nn][Tt][Ee][Nn][Tt]-[Ll][Ee][Nn][Gg][Tt][Hh]: //p' | tail -n 1)
echo "→ downloading ${bin} ${version} for ${os}/${arch}…"
if [ "$final_url" ]; then
  show() {
    size=$(wc -c "$bin" 2>/dev/null | sed 's/ .*//'); size=${size:-0}
    if [ "${total:-0}" -gt 0 ] 2>/dev/null; then
      pct=$((size * 100 / total)); fill=$((pct / 5)); empty=$((20 - fill))
      bar=$(printf '%*s' "$fill" '' | tr ' ' '#')$(printf '%*s' "$empty" '' | tr ' ' '-')
      printf '
[%s] %3d%% %3d/%3d MiB' "$bar" "$pct" $((size / 1048576)) $(((total + 1048575) / 1048576)) >&2
    else
      printf '
%3d MiB' $((size / 1048576)) >&2
    fi
  }
else
  :
fi
download_url=${final_url:-$url}
attempt=1
while :; do
  rm -f "$bin"
  if [ "$final_url" ]; then
    curl -fsSL "$final_url" -o "$bin" &
    pid=$!
    if [ -t 2 ]; then while kill -0 "$pid" 2>/dev/null; do show; sleep 0.2; done; fi
    if wait "$pid"; then
      if [ -t 2 ]; then show; printf '
' >&2; fi
      break
    else
      code=$?
      if [ -t 2 ]; then printf '
' >&2; fi
    fi
  else
    if curl -fL --progress-bar "$url" -o "$bin"; then
      break
    else
      code=$?
    fi
  fi
  rm -f "$bin"
  status=$(probe_status "$download_url")
  case "$status" in
    404) echo "error: failed to download ${bin} ${version} (HTTP ${status})" >&2; exit 1 ;;
    5??) detail="HTTP ${status}" ;;
    *) detail="curl exit ${code}" ;;
  esac
  retry "$attempt" "download" "$detail" || {
    case "$status" in
      5??|4??) echo "error: failed to download ${bin} ${version} (HTTP ${status})" >&2 ;;
      *) echo "error: failed to download ${bin} ${version}" >&2 ;;
    esac
    exit 1
  }
  attempt=$((attempt + 1))
done
chmod +x "$bin"
echo "→ installed ./${bin}"