#!/bin/sh
# Substitute Hugging Face Spaces runtime env vars into the built index.html
# before nginx starts.
#
# On `sdk: docker` Spaces, HF only exposes its OAuth + Space helper variables
# server-side (as env vars), never client-side like it does for static/Gradio
# Spaces. We bridge the gap by patching the placeholders we emit in index.html
# with the real values here.
set -eu

INDEX_FILE="${INDEX_FILE:-/usr/share/nginx/html/index.html}"

if [ ! -f "$INDEX_FILE" ]; then
    echo "[inject-hf-vars] $INDEX_FILE not found, skipping" >&2
    exit 0
fi

replace() {
    placeholder="$1"
    value="$2"
    escaped=$(printf '%s' "$value" | sed -e 's/[\\/&]/\\&/g')
    sed -i "s/${placeholder}/${escaped}/g" "$INDEX_FILE"
}

replace "__OAUTH_CLIENT_ID__" "${OAUTH_CLIENT_ID:-}"
replace "__OAUTH_SCOPES__"    "${OAUTH_SCOPES:-openid profile}"
replace "__SPACE_HOST__"      "${SPACE_HOST:-}"
replace "__SPACE_ID__"        "${SPACE_ID:-}"

if [ -n "${OAUTH_CLIENT_ID:-}" ]; then
    echo "[inject-hf-vars] OAUTH_CLIENT_ID injected (${OAUTH_CLIENT_ID%${OAUTH_CLIENT_ID#????????}}…)"
else
    echo "[inject-hf-vars] OAUTH_CLIENT_ID is empty (hf_oauth: true missing?)" >&2
fi