#!/bin/sh
# Applies $BASE_URL to the built bundle and the nginx config at container start.
#
# The bundle is built with Vite's base set to the literal token below, so every asset
# URL in the emitted HTML/JS/CSS carries it. Rewriting that token here is what lets one
# image serve from any path without a rebuild.
set -eu

TOKEN='/__R2B_BASE__/'
SRC='/opt/ready2blob/html'
DEST='/usr/share/nginx/html'

# Normalize to a leading and trailing slash: "app" and "/app" both mean "/app/".
base="${BASE_URL:-/}"
case "$base" in /*) ;; *) base="/$base" ;; esac
case "$base" in */) ;; *) base="$base/" ;; esac

echo "ready2blob: serving from base $base"

# Rebuild the web root from the pristine copy on every start, so both restarts and
# BASE_URL changes are idempotent.
rm -rf "${DEST:?}"/*
mkdir -p "$DEST$base"
cp -R "$SRC/." "$DEST$base"

# '|' as the sed delimiter, since both needle and replacement contain '/'.
find "$DEST" -type f \( -name '*.html' -o -name '*.js' -o -name '*.css' \) \
    -exec sed -i "s|$TOKEN|$base|g" {} +

# Restrict envsubst to BASE_URL so nginx's own $uri / $1 survive untouched.
export BASE_URL="$base"
envsubst '${BASE_URL}' \
    < /etc/nginx/ready2blob.conf.template \
    > /etc/nginx/conf.d/default.conf