#!/bin/bash
set -e

# ⚠️ 关键：不给默认值，强制在 SAE 控制台配置
# 如果未配置，报错退出（避免使用错误的后端地址）
if [ -z "$BACKEND_SERVICE_HOST" ]; then
  echo "❌ ERROR: BACKEND_SERVICE_HOST environment variable is required!"
  echo "Please configure it in SAE console with backend internal IP (e.g., 172.17.x.x)"
  exit 1
fi

if [ -z "$BACKEND_SERVICE_PORT" ]; then
  echo "⚠️  WARNING: BACKEND_SERVICE_PORT not set, using default: 3001"
  export BACKEND_SERVICE_PORT=3001
fi

echo "============================================"
echo "Starting Frontend Nginx Service"
echo "Backend Service: ${BACKEND_SERVICE_HOST}:${BACKEND_SERVICE_PORT}"
echo "Container Timezone: $(cat /etc/timezone)"
echo "Current Time: $(date)"
echo "============================================"

# 使用 envsubst 替换 Nginx 配置中的环境变量
envsubst '${BACKEND_SERVICE_HOST} ${BACKEND_SERVICE_PORT}' \
  < /etc/nginx/templates/nginx.conf.template \
  > /etc/nginx/nginx.conf

# 验证 Nginx 配置
nginx -t

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