server {
    listen 80;
    server_name _;
    charset utf-8;
    resolver 127.0.0.11 valid=10s ipv6=off;

    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    root /usr/share/nginx/html;
    index index.html;

    # gzip 압축
    gzip on;
    gzip_types text/plain text/css application/javascript application/json;
    gzip_min_length 1024;

    # HTML 캐시 비활성화
    location ~* \.html$ {
        expires -1;
        add_header Cache-Control "no-store, no-cache, must-revalidate";
    }

    # JS/CSS 캐시 활성화 (버전 쿼리 스트링으로 무효화)
    location ~* \.(js|css)$ {
        expires 1h;
        add_header Cache-Control "public, no-transform";
    }

    # 정적 파일 (이미지 등)
    location ~* \.(png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf)$ {
        expires 1h;
        add_header Cache-Control "public, no-transform";
    }

    # 정적 파일
    location / {
        try_files $uri $uri/ /index.html;
    }

    # 업로드 파일 프록시 (^~ 로 regex location보다 우선 매칭)
    location ^~ /uploads/ {
        set $upstream http://tkuser-api:3000;
        proxy_pass $upstream$request_uri;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # work-issues API 프록시 → system2-api
    location /api/work-issues/ {
        set $upstream http://system2-api:3005;
        proxy_pass $upstream$request_uri;
        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 프록시 → tkuser-api
    location /api/ {
        set $upstream http://tkuser-api:3000;
        proxy_pass $upstream$request_uri;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        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_cache_bypass $http_upgrade;
    }

    # Health check
    location /health {
        access_log off;
        return 200 'ok';
        add_header Content-Type text/plain;
    }
}