server {
    listen 80;
    server_name _;

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

    client_max_body_size 25m;

    # 텍스트 자산 gzip 압축 (이미지는 제외)
    gzip on;
    gzip_vary on;
    gzip_comp_level 6;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_types
        text/plain
        text/css
        application/javascript
        application/json
        image/svg+xml
        application/manifest+json;

    # 보안 헤더 (add_header가 없는 location에 상속됨)
    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;

    # 공유 링크 → 덱 로드 페이지
    location ~ ^/d/([A-Za-z0-9]+)$ {
        return 302 /cardList.html?d=$1;
    }

    # API → 백엔드 컨테이너
    location /api/ {
        proxy_pass http://uniare-api:3000;
        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;
        client_max_body_size 25m;
    }

    # HTML — 배포 직후 반영
    location ~* \.html$ {
        add_header Cache-Control "no-cache, must-revalidate";
        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;
        try_files $uri =404;
    }

    # 핵심 JS — 구 URL(?v= 없음)도 최신 파일 제공 (CDN immutable 회피)
    location = /script/deck-favorites.js {
        add_header Cache-Control "no-cache, must-revalidate";
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    location = /script/api.js {
        add_header Cache-Control "no-cache, must-revalidate";
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    location = /script/auth-form.js {
        add_header Cache-Control "no-cache, must-revalidate";
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # CSS — 배포 후 즉시 반영 (immutable 사용 안 함)
    location ~* \.css$ {
        expires 1h;
        add_header Cache-Control "public, must-revalidate";
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # JS — immutable 제거 (이미지보다 짧게 재검증)
    location ~* \.js$ {
        expires 1h;
        add_header Cache-Control "public, must-revalidate";
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # 이미지 등 — 내용이 고정된 정적 자산이므로 장기 캐시
    location ~* \.(png|jpg|jpeg|gif|webp|ico|svg|woff2?)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }
}