server {
    listen 80;
    server_name _;
    resolver 127.0.0.11 valid=10s ipv6=off;

    client_max_body_size 10M;

    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 issues-dashboard.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";
    }

    # API 프록시 (System 3 API)
    location /api/ {
        set $upstream http://system3-api:8000;
        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;

        # 엑셀 생성 등 시간이 걸리는 API 대응
        proxy_read_timeout 120s;
        proxy_send_timeout 120s;
        proxy_buffering off;
    }

    # AI API 프록시 (맥미니 home-service-proxy 경유)
    location /ai-api/ {
        set $ai_upstream https://ai.hyungi.net;
        rewrite ^/ai-api/(.*) /api/ai/$1 break;
        proxy_pass $ai_upstream;
        proxy_http_version 1.1;
        proxy_set_header Host ai.hyungi.net;
        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_ssl_server_name on;
        proxy_read_timeout 180s;
        proxy_send_timeout 180s;
    }

    # 모바일 전용 페이지
    location /m/ {
        alias /usr/share/nginx/html/m/;
        try_files $uri $uri/ /m/dashboard.html;
        location ~* \.html$ {
            expires -1;
            add_header Cache-Control "no-store, no-cache, must-revalidate";
        }
    }

    # 업로드 파일
    location /uploads/ {
        alias /usr/share/nginx/html/uploads/;
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    location / {
        try_files $uri $uri/ /issues-dashboard.html;
    }
}