#!/bin/sh
# stipend installer — https://stipend.sh
#
# This is a wrapper. The installer itself is install.py, and it is the same one
# on every platform: macOS, Linux, Windows. Three separate installers drift
# apart, and the one nobody tests is the one an agent runs.
#
# It fetches one Python package, unpacks it, and writes a launcher. It does not
# create a wallet, touch any key, or send anything anywhere. Read it first:
#
#     curl -sL https://stipend.sh/install.py
#
set -eu

URL="${STIPEND_INSTALLER:-https://stipend.sh/install.py}"

# python3 on most systems, python where that is the only name — some minimal
# images ship one and not the other.
PY=""
for candidate in python3 python; do
  if command -v "$candidate" >/dev/null 2>&1; then
    if "$candidate" -c 'import sys; raise SystemExit(0 if sys.version_info >= (3, 8) else 1)' 2>/dev/null; then
      PY="$candidate"
      break
    fi
  fi
done

if [ -z "$PY" ]; then
  echo "stipend: python 3.8 or newer is required." >&2
  echo "" >&2
  echo "  Debian/Ubuntu:  sudo apt install python3" >&2
  echo "  macOS:          brew install python3" >&2
  echo "  Alpine:         apk add python3" >&2
  exit 1
fi

# A pipe, not a temporary file: nothing is left on disk if this is interrupted,
# and there is no file for anything else to race us for.
if command -v curl >/dev/null 2>&1; then
  curl -fsSL "$URL" | "$PY" -
elif command -v wget >/dev/null 2>&1; then
  wget -qO- "$URL" | "$PY" -
else
  echo "stipend: curl or wget is required." >&2
  exit 1
fi