#!/bin/sh
set -eu

# Only emit whitelisted locale tags to avoid config.js injection from env values.
RUNTIME_DEFAULT_LOCALE=""
case "${DEFAULT_LOCALE:-}" in
  zh-CN|en-US|ru-RU|ko-KR) RUNTIME_DEFAULT_LOCALE="${DEFAULT_LOCALE}" ;;
esac

# 生成运行时配置文件，注入环境变量到前端
FILE_MB=${MAX_FILE_SIZE_MB:-50}
# Keep the browser and nginx in lockstep with the Go application ceiling.
# Values above 20 GiB are rejected by the backend and must not produce a
# misleadingly larger client-side limit or an oversized nginx request body.
case "$FILE_MB" in
  ''|*[!0-9]*) FILE_MB=50 ;;
esac
if [ "$FILE_MB" -gt 20480 ]; then
  FILE_MB=20480
fi
if [ "$FILE_MB" -le 0 ]; then
  FILE_MB=50
fi
SKILL_MB=${MAX_SKILL_BUNDLE_SIZE_MB:-256}
case "$SKILL_MB" in
  ''|*[!0-9]*) SKILL_MB=256 ;;
esac
if [ "$SKILL_MB" -lt "$FILE_MB" ] 2>/dev/null; then
  SKILL_MB=$FILE_MB
fi
if [ "$SKILL_MB" -gt 512 ] 2>/dev/null; then
  SKILL_MB=512
fi

cat > /usr/share/nginx/html/config.js << EOF
window.__RUNTIME_CONFIG__ = {
  MAX_FILE_SIZE_MB: ${FILE_MB},
  MAX_SKILL_BUNDLE_SIZE_MB: ${SKILL_MB},
  DEFAULT_LOCALE: "${RUNTIME_DEFAULT_LOCALE}"
};
EOF

# Rebuild from immutable templates on every start, including restarts with a
# changed locale. Inlining removes a blocking request before the app can boot.
for PAGE in index.html embed.html; do
  awk '
    NR == FNR { config = config $0 "\n"; next }
    /<script src="\/config.js"><\/script>/ {
      if (++replaced != 1) exit 1
      print "<script data-runtime-config>\n" config "</script>"
      next
    }
    { print }
    END { if (replaced != 1) exit 1 }
  ' /usr/share/nginx/html/config.js \
    "/usr/share/nginx/runtime-templates/$PAGE" > "/usr/share/nginx/html/$PAGE.next"
  mv "/usr/share/nginx/html/$PAGE.next" "/usr/share/nginx/html/$PAGE"
done

# 处理 nginx 配置。
# 两个上限分开注入：全站保持知识库的 MAX_FILE_SIZE，只有技能 zip 上传的两条
# 集合路由放宽到 MAX_SKILL_BUNDLE_SIZE（不含 /install、PATCH 等子路径）。
# 合成一个全站上限会让每个上传端点都能收到技能包那么大的 body。
export MAX_FILE_SIZE=${FILE_MB}M
export MAX_SKILL_BUNDLE_SIZE=${SKILL_MB}M
export APP_HOST=${APP_HOST:-app}
export APP_PORT=${APP_PORT:-8080}
export APP_SCHEME=${APP_SCHEME:-http}
envsubst '${MAX_FILE_SIZE} ${MAX_SKILL_BUNDLE_SIZE} ${APP_HOST} ${APP_PORT} ${APP_SCHEME}' \
  < /etc/nginx/templates/default.conf.template > /etc/nginx/conf.d/default.conf

# 启动 nginx
exec nginx -g 'daemon off;'