# CaStAD Nginx Configuration
# Target: castad1.ktenterprise.net
# 
# 설치 방법:
#   sudo cp nginx.castad.conf /etc/nginx/sites-available/castad
#   sudo ln -s /etc/nginx/sites-available/castad /etc/nginx/sites-enabled/
#   sudo nginx -t && sudo systemctl reload nginx
#

upstream castad_backend {
    server 127.0.0.1:3001;
    keepalive 64;
}

upstream castad_instagram {
    server 127.0.0.1:5001;
    keepalive 32;
}

# HTTP → HTTPS 리다이렉트
server {
    listen 80;
    server_name castad1.ktenterprise.net;
    return 301 https://$server_name$request_uri;
}

# HTTPS 메인 서버
server {
    listen 443 ssl http2;
    server_name castad1.ktenterprise.net;

    # SSL 인증서 (Let's Encrypt 사용 시)
    ssl_certificate /etc/letsencrypt/live/castad1.ktenterprise.net/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/castad1.ktenterprise.net/privkey.pem;
    
    # SSL 보안 설정
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;

    # 보안 헤더
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # 클라이언트 요청 크기 (이미지 업로드용)
    client_max_body_size 100M;
    client_body_timeout 300s;

    # Gzip 압축
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/xml+rss application/atom+xml image/svg+xml;

    # 로그
    access_log /var/log/nginx/castad_access.log;
    error_log /var/log/nginx/castad_error.log;

    # 정적 파일 (빌드된 프론트엔드)
    root /home/castad/castad/dist;
    index index.html;

    # API 프록시 (백엔드)
    location /api/ {
        proxy_pass http://castad_backend;
        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;
        proxy_read_timeout 300s;
        proxy_connect_timeout 75s;
    }

    # 렌더링 엔드포인트 (긴 타임아웃)
    location /render/ {
        proxy_pass http://castad_backend;
        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_read_timeout 600s;  # 10분 (영상 렌더링용)
        proxy_connect_timeout 75s;
        proxy_buffering off;
    }

    # 다운로드 파일
    location /downloads/ {
        proxy_pass http://castad_backend;
        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;
    }

    # 임시 파일 (렌더링 미리보기)
    location /temp/ {
        proxy_pass http://castad_backend;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # Instagram API (Python 서비스)
    location /instagram/ {
        proxy_pass http://castad_instagram/;
        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_read_timeout 120s;
    }

    # SPA 라우팅 (React Router)
    location / {
        try_files $uri $uri/ /index.html;
        
        # 정적 에셋 캐싱
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
        }
    }

    # 헬스체크
    location /health {
        proxy_pass http://castad_backend/api/health;
        proxy_http_version 1.1;
        access_log off;
    }
}