# 生产 Nginx：SPA + API/WebSocket 反代 + 对象存储公共读路径
# 上游服务名与 docker-compose.prod.yml 中 service 名一致

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

upstream kefu_api {
    server api:8080;
    keepalive 32;
}

upstream kefu_minio {
    server minio:9000;
}

server {
    listen 80;
    server_name _;

    client_max_body_size 20m;
    # 上传/长连接
    proxy_read_timeout 3600s;
    proxy_send_timeout 3600s;

    # 健康探针（不经 API）
    location = /healthz {
        access_log off;
        add_header Content-Type text/plain;
        return 200 'ok';
    }

    # 后端健康检查
    location = /health {
        proxy_pass http://kefu_api/health;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    # API + WebSocket（/api/ws、/api/widget/ws）
    location /api/ {
        proxy_pass http://kefu_api/api/;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_buffering off;
    }

    # 图片公共访问：浏览器访问 /files/* → MinIO bucket kefu/*
    # 须与 STORAGE_PUBLIC_BASE_URL=https://你的域名/files 一致
    location /files/ {
        proxy_pass http://kefu_minio/kefu/;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        # 允许跨域拉取图片（嵌入站点）
        add_header Access-Control-Allow-Origin * always;
        add_header Access-Control-Allow-Methods "GET, HEAD, OPTIONS" always;
        if ($request_method = OPTIONS) {
            return 204;
        }
        expires 7d;
        add_header Cache-Control "public" always;
    }

    # 前端静态资源
    location / {
        root /usr/share/nginx/html;
        try_files $uri $uri/ /index.html;
    }

    # 构建产物长缓存
    location /assets/ {
        root /usr/share/nginx/html;
        expires 30d;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }
}