# WebSocket Upgrade 헤더 맵 (Connection 헤더 정확한 전달)
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

# HTTP 서버 (모바일 앱 접근용)
server {
    listen 80;
    server_name _;
    
    root /usr/share/nginx/html;
    index index.html;
    
    # gzip 압축
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
    gzip_min_length 1000;
    
    # React Router를 위한 설정
    location / {
        try_files $uri $uri/ /index.html;
        
        # index.html 캐시 방지 + ETag/Last-Modified 제거
        location = /index.html {
            add_header Cache-Control "no-cache, no-store, must-revalidate, proxy-revalidate, max-age=0";
            add_header Pragma "no-cache";
            add_header Expires "0";
            etag off;
            if_modified_since off;
            add_header Last-Modified "";
        }
    }
    
    # SSE 알림 구독 (버퍼링 비활성화 필수)
    location /api/notifications/subscribe {
        proxy_pass http://backend:8082/api/notifications/subscribe;
        proxy_http_version 1.1;
        proxy_set_header Connection '';
        proxy_set_header Cache-Control 'no-cache';
        proxy_set_header X-Accel-Buffering 'no';
        proxy_buffering off;
        proxy_cache off;
        chunked_transfer_encoding on;
        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 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'Origin, X-Requested-With, Content-Type, Accept, Authorization' always;
    }

    # API 프록시 설정 (백엔드로 요청 전달)
    location /api/ {
        proxy_pass http://backend:8082/api/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        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;
        
        # 타임아웃 설정
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
        
        # CORS 헤더
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'Origin, X-Requested-With, Content-Type, Accept, Authorization' always;
        
        # OPTIONS 요청 처리
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'Origin, X-Requested-With, Content-Type, Accept, Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
    }
    
    # WebSocket 프록시 (STOMP /ws, SockJS 하위경로, Native /ws/realtime 등 — URI 전체를 백엔드로 전달)
    location /ws {
        proxy_pass http://backend:8082;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $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;
        
        # WebSocket 타임아웃 설정 (길게 유지)
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
        
        # CORS 헤더
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'Origin, X-Requested-With, Content-Type, Accept' always;
    }
    
    # Market Data WebSocket 프록시 (실시간 차트용 - Python Broadcast Server)
    location /market-data/ {
        proxy_pass http://market-data-broadcast:8000/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $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_buffering off;
        
        # WebSocket 타임아웃 설정 (길게 유지)
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
        
        # CORS 헤더
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'Origin, X-Requested-With, Content-Type, Accept' always;
    }
    
    # 정적 파일 캐싱 비활성화 (개발용)
    location ~* \.(js|css|map)$ {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
        etag off;
    }
}

# HTTPS 서버
server {
    listen 443 ssl http2;
    server_name _;
    
    # SSL 인증서 설정
    ssl_certificate /etc/nginx/ssl/server.crt;
    ssl_certificate_key /etc/nginx/ssl/server.key;
    
    # 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;
    
    root /usr/share/nginx/html;
    index index.html;
    
    # gzip 압축
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
    gzip_min_length 1000;
    
    # React Router를 위한 설정
    location / {
        try_files $uri $uri/ /index.html;
        
        # index.html 캐시 방지 + ETag/Last-Modified 제거 (항상 최신 버전 제공)
        location = /index.html {
            add_header Cache-Control "no-cache, no-store, must-revalidate, proxy-revalidate, max-age=0";
            add_header Pragma "no-cache";
            add_header Expires "0";
            etag off;
            if_modified_since off;
            add_header Last-Modified "";
        }
    }
    
    # AI Agent 프록시 (LangGraph 기반)
    location /api/agent/ {
        proxy_pass http://ai-agent:8000/;  # AI Agent 서비스
        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;
        proxy_buffering off;  # 스트리밍 응답을 위해 버퍼링 비활성화
        
        # CORS 헤더 추가
        add_header 'Access-Control-Allow-Origin' '$http_origin' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
        
        # OPTIONS 요청 처리 (Preflight)
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '$http_origin';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
    }
    
    # WebSocket 프록시 (레거시 /api/ws → 백엔드 /ws 로 전달)
    location /api/ws {
        proxy_pass http://backend:8082/ws;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $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;
        
        # WebSocket 타임아웃 설정 (길게 유지)
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
        
        # CORS 헤더
        add_header 'Access-Control-Allow-Origin' '$http_origin' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
    }
    
    # SSE 알림 구독 (버퍼링 비활성화 필수)
    location /api/notifications/subscribe {
        proxy_pass http://backend:8082/api/notifications/subscribe;
        proxy_http_version 1.1;
        proxy_set_header Connection '';
        proxy_set_header Cache-Control 'no-cache';
        proxy_set_header X-Accel-Buffering 'no';
        proxy_buffering off;
        proxy_cache off;
        chunked_transfer_encoding on;
        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 $scheme;
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
        add_header 'Access-Control-Allow-Origin' '$http_origin' always;
        add_header 'Access-Control-Allow-Methods' 'GET, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'Origin, X-Requested-With, Content-Type, Accept, Authorization' always;
    }

    # API 프록시 (Spring Boot 백엔드 - REST API)
    location /api/ {
        proxy_pass http://backend:8082/api/;  # Docker 내부 네트워크
        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;
        
        # CORS 헤더 추가
        add_header 'Access-Control-Allow-Origin' '$http_origin' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
        
        # OPTIONS 요청 처리 (Preflight)
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '$http_origin';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
    }
    
    # WebSocket 프록시 (STOMP /ws, Native /ws/realtime — URI 전체 전달)
    location /ws {
        proxy_pass http://backend:8082;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $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;
        
        # WebSocket 타임아웃 설정 (길게 유지)
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
        
        # CORS 헤더
        add_header 'Access-Control-Allow-Origin' '$http_origin' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
    }
    
    # Market Data WebSocket 프록시 (실시간 차트용 - Python Broadcast Server)
    location /market-data/ {
        proxy_pass http://market-data-broadcast:8000/;
        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;
        
        # WebSocket 타임아웃 설정 (길게 유지)
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
        
        # CORS 헤더
        add_header 'Access-Control-Allow-Origin' '$http_origin' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
    }
    
    # 정적 파일 캐싱 (개발 환경에서는 캐시 비활성화)
    location ~* \.(js|css|map)$ {
        add_header Cache-Control "no-cache, no-store, must-revalidate, proxy-revalidate, max-age=0";
        add_header Pragma "no-cache";
        add_header Expires "0";
        add_header X-Content-Type-Options "nosniff";
        # ETag 비활성화 (캐시 우회)
        etag off;
        if_modified_since off;
    }
    
    # 이미지 및 폰트는 짧은 캐시
    location ~* \.(png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
        expires 1h;
        add_header Cache-Control "public";
    }
}