#!/usr/bin/env bash
set -e

if [[ $1 == "-m" ]] && [[ $2 == "pip" ]]; then
    # redirect python -m pip to execute in host environment
    shift 2
    which $(dirname $0)/pip > /dev/null || { \
        >&2 echo "Cannot find pyodide pip. Make a pyodide venv first?" && exit 1; \
    }
    exec $(dirname $0)/pip $@
fi

which node > /dev/null  || { \
    >&2 echo "No node executable found on the path" && exit 1; \
}

ARGS=$(node -e "$(cat <<"EOF"
const major_version = Number(process.version.split(".")[0].slice(1));
if(major_version < 18) {
    console.error("Need node version >= 18. Got node version", process.version);
    process.exit(1);
}

if (major_version >= 20) {
    process.stdout.write("--experimental-wasm-stack-switching");
}
EOF
)")

# Macs come with FreeBSD coreutils which doesn't have the -s option
# so feature detect and work around it.
if which grealpath > /dev/null; then
    # It has brew installed gnu core utils, use that
    REALPATH="grealpath -s"
elif which realpath > /dev/null && realpath --version > /dev/null 2> /dev/null && realpath --version | grep GNU > /dev/null; then
    # realpath points to GNU realpath so use it.
    REALPATH="realpath -s"
else
    # Shim for macs without GNU coreutils
    abs_path () {
        echo "$(cd "$(dirname "$1")" || exit; pwd)/$(basename "$1")"
    }
    REALPATH=abs_path
fi


RESOLVED_DIR=$(dirname $(realpath "$0"))

# Compute our own path, not following symlinks and pass it in so that
# node_entry.mjs can set sys.executable correctly.
# Intentionally allow word splitting on $NODEFLAGS.
exec node $NODEFLAGS $ARGS $RESOLVED_DIR/python_cli_entry.mjs --this-program="$($REALPATH "$0")" "$@"