worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for" '
                    'request_id=$upstream_http_x_request_id';

    access_log /var/log/nginx/access.log main;

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;

    # Gzip
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;

    # Rate limiting zone
    limit_req_zone $binary_remote_addr zone=api:10m rate=30r/s;
    limit_req_zone $binary_remote_addr zone=auth:10m rate=5r/s;
    limit_req_zone $binary_remote_addr zone=upload:10m rate=10r/s;

    # Docker Compose 内置 DNS resolver —— 让 proxy_pass 中的主机名延迟解析（请求时才查），
    # 避免 nginx 启动时 backend/admin-web 容器的 DNS 还没注册好就 [emerg] 退出。
    resolver 127.0.0.11 valid=30s ipv6=off;

    server {
        listen 80;
        server_name localhost;

        # upstream 变量（必须在 server 块内，不能在 http 顶层）
        # 使用固定容器名，避免后端因跨 compose 网络重连后丢失 service alias。
        set $backend_upstream "http://danyang-match-backend:8080";
        set $admin_upstream "http://admin-web:80";

        # Health check for nginx itself
        location /nginx-health {
            return 200 'ok';
            add_header Content-Type text/plain;
        }

        # API proxy
        location /api/ {
            limit_req zone=api burst=50 nodelay;
            proxy_pass $backend_upstream;
            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_connect_timeout 30s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
            add_header Cache-Control "no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0";
            add_header Pragma "no-cache";
        }

        # 用户间即时聊天已下线，避免网关继续暴露 WebSocket 入口。
        location /ws/ {
            default_type application/json;
            return 410 '{"success":false,"code":"CHAT_DISABLED","message":"平台未提供用户之间的即时聊天功能","data":null}';
        }

        # Auth endpoints - stricter rate limit
        location /api/v1/auth/ {
            limit_req zone=auth burst=10 nodelay;
            proxy_pass $backend_upstream;
            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;
        }

        # Admin web —— 管理端产物挂在 /admin/ 子路径下（构建 base=/admin/，
        # 见 admin-web/vite.config.ts）。与生产 nginx 保持同一形态：**不剥离**前缀地
        # 转发给 admin-web 容器，由容器内的 nginx（admin-web/nginx-admin.conf）
        # 统一处理 /admin/ 前缀。三处入口（生产 / 本地整套栈 / staging 直连）因此一致。
        location = /admin {
            return 301 /admin/;
        }
        location /admin/ {
            proxy_pass $admin_upstream;
            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;
        }

        # 其余未匹配路径（不含 /admin、/api、/ws）统一跳转到管理端入口。
        # 根路径没有内容，显式跳转以避免"打根路径拿到一个空白/错页"的假成功。
        location / {
            return 301 /admin/;
        }
    }
}