#!/bin/sh
set -eu

BASE="https://stet.fyi"

sanitize() { printf '%s' "$1" | tr '[:upper:]' '[:lower:]' | tr -cd '[:lower:][:digit:]'; }

os="$(uname -s)"
case "$os" in
  Linux)                     os=linux ;;
  Darwin)                    os=darwin ;;
  MINGW*|MSYS*|CYGWIN*)      os=windows ;;
  *)                         os="$(sanitize "$os")" ;;
esac

arch="$(uname -m)"
case "$arch" in
  x86_64|amd64)               arch=amd64 ;;
  aarch64|arm64)              arch=arm64 ;;
  armv6l|armv7l|armv8l)       arch=arm ;;
  i386|i686)                  arch=386 ;;
  *)                          arch="$(sanitize "$arch")" ;;
esac

if [ "$os" = "darwin" ] && [ "$arch" = "amd64" ]; then
  if [ "$(sysctl -n hw.optional.arm64 2>/dev/null || echo 0)" = "1" ]; then arch=arm64; fi
fi

if [ "$os" = "windows" ]; then
  machine_arch="$(MSYS2_ARG_CONV_EXCL='*' reg query 'HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment' /v PROCESSOR_ARCHITECTURE 2>/dev/null | tr -d '\r' | awk '/PROCESSOR_ARCHITECTURE/ { print $NF }' || true)"
  case "$machine_arch" in
    ARM64) arch=arm64 ;;
    AMD64) arch=amd64 ;;
  esac
fi

ext=""
[ "$os" = "windows" ] && ext=".exe"

dest_dir="$HOME/.local/bin"
dest="$dest_dir/stet$ext"
tmp="$dest.tmp"
url="$BASE/cli/stet/$os-$arch$ext"

mkdir -p "$dest_dir"
rm -f "$tmp"
echo "installing $url -> $dest"
code="$(curl -sSL --compressed -w '%{http_code}' -o "$tmp" "$url")" || code=000
if [ "$code" != "200" ]; then
  echo "install.sh: download failed (HTTP $code) for $os-$arch" >&2
  case "$code" in
    4??|5??) if [ -s "$tmp" ]; then { head -c 2000 "$tmp" | tr -cd '[:print:]\t\n'; echo; } >&2; fi ;;
  esac
  rm -f "$tmp"
  exit 1
fi
rm -f "$dest"
mv "$tmp" "$dest"
chmod +x "$dest"

case ":$PATH:" in
  *":$dest_dir:"*) : ;;
  *) echo "note: $dest_dir is not on PATH — add:  export PATH=\"\$HOME/.local/bin:\$PATH\"" ;;
esac

found="$(command -v stet 2>/dev/null || true)"
if [ -n "$found" ] && [ "$found" != "$dest" ] && [ "$found" != "$dest_dir/stet" ]; then
  echo "warning: $found comes first on PATH and shadows $dest — remove it or put $dest_dir first on PATH" >&2
fi

printf 'installed stet '
"$dest" version