#!/bin/sh
# Install the WAI command line, and what `wai dev` runs, from the forge's releases:
#
#   curl -fsSL https://wai.transaction.science/install.sh | sh
#
# It picks the archive for this system (macOS or Linux, arm64 or x86_64), checks it against the
# SHA-256 the release states, and unpacks it into $WAI_HOME (default ~/.wai): bin/ and
# share/wai/web/ side by side. Then it says which line puts ~/.wai/bin on your PATH. Nothing
# else is changed. WAI_VERSION picks a release (default: the one below).
set -eu
VERSION="${WAI_VERSION:-0.4.0}"
DEST="${WAI_HOME:-$HOME/.wai}"
BASE="https://git.transaction.science/Transaction-Science/open-standards/releases/download/wai-v$VERSION"
case "$(uname -s)" in
  Darwin) os=apple-darwin ;;
  Linux) os=unknown-linux-musl ;;
  *) echo "wai: no archive for $(uname -s); build from source: https://wai.transaction.science/docs/quickstart/" >&2; exit 1 ;;
esac
case "$(uname -m)" in
  arm64 | aarch64) cpu=aarch64 ;;
  x86_64 | amd64) cpu=x86_64 ;;
  *) echo "wai: no archive for $(uname -m)" >&2; exit 1 ;;
esac
NAME="wai-$VERSION-$cpu-$os"
TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT
echo "wai: fetching $NAME"
curl -fsSL -o "$TMP/$NAME.tar.gz" "$BASE/$NAME.tar.gz"
curl -fsSL -o "$TMP/$NAME.tar.gz.sha256" "$BASE/$NAME.tar.gz.sha256"
want="$(cut -d' ' -f1 "$TMP/$NAME.tar.gz.sha256")"
if command -v sha256sum > /dev/null 2>&1; then got="$(sha256sum "$TMP/$NAME.tar.gz" | cut -d' ' -f1)"; else got="$(shasum -a 256 "$TMP/$NAME.tar.gz" | cut -d' ' -f1)"; fi
[ "$got" = "$want" ] || { echo "wai: the archive's SHA-256 is $got, not the release's $want; nothing installed" >&2; exit 1; }
tar -xzf "$TMP/$NAME.tar.gz" -C "$TMP"
mkdir -p "$DEST"
rm -rf "$DEST/bin" "$DEST/share/wai"
mkdir -p "$DEST/share"
mv "$TMP/$NAME/bin" "$DEST/bin"
mv "$TMP/$NAME/share/wai" "$DEST/share/wai"
cp "$TMP/$NAME/README.md" "$TMP/$NAME/LICENSE" "$DEST/"
"$DEST/bin/wai" create --list > /dev/null
echo "wai: installed in $DEST. Put it on your PATH:"
echo "  export PATH=\"$DEST/bin:\$PATH\""
echo "then: wai hello"