#!/usr/bin/env sh
# Install the latest onwrite release.
#
#   curl -fsSL https://raw.githubusercontent.com/amartya-dev/onwrite/main/scripts/install.sh | sh
#
# Set ONWRITE_INSTALL_DIR to choose where the binary lands (default: the first
# writable entry among ~/.local/bin, /usr/local/bin).
set -eu

repo="amartya-dev/onwrite"

os="$(uname -s | tr '[:upper:]' '[:lower:]')"
arch="$(uname -m)"
case "$arch" in
  x86_64 | amd64) arch="amd64" ;;
  arm64 | aarch64) arch="arm64" ;;
  *) echo "onwrite: unsupported architecture: $arch" >&2; exit 1 ;;
esac
case "$os" in
  darwin | linux) ;;
  *) echo "onwrite: unsupported OS: $os — see the releases page" >&2; exit 1 ;;
esac

version="${ONWRITE_VERSION:-}"
if [ -z "$version" ]; then
  version="$(curl -fsSL "https://api.github.com/repos/$repo/releases/latest" \
    | sed -n 's/.*"tag_name": *"\([^"]*\)".*/\1/p' | head -1)"
fi
if [ -z "$version" ]; then
  echo "onwrite: could not determine the latest version" >&2
  exit 1
fi

dir="${ONWRITE_INSTALL_DIR:-}"
if [ -z "$dir" ]; then
  for candidate in "$HOME/.local/bin" /usr/local/bin; do
    if [ -d "$candidate" ] && [ -w "$candidate" ]; then dir="$candidate"; break; fi
  done
fi
if [ -z "$dir" ]; then
  dir="$HOME/.local/bin"
  mkdir -p "$dir"
fi

asset="onwrite_${version}_${os}_${arch}.tar.gz"
url="https://github.com/$repo/releases/download/$version/$asset"

tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT

echo "onwrite: downloading $version for $os/$arch"
curl -fsSL "$url" -o "$tmp/onwrite.tar.gz"
tar -xzf "$tmp/onwrite.tar.gz" -C "$tmp"

found="$(find "$tmp" -name onwrite -type f | head -1)"
if [ -z "$found" ]; then
  echo "onwrite: the archive did not contain a binary" >&2
  exit 1
fi

install -m 0755 "$found" "$dir/onwrite"
echo "onwrite: installed to $dir/onwrite"

case ":$PATH:" in
  *":$dir:"*) ;;
  *) echo "onwrite: note that $dir is not on your PATH" ;;
esac

"$dir/onwrite" --version