# Production Nginx Configuration for GNX Soft (Docker)
# This configuration is for nginx running on the host machine
# It proxies to Docker containers: backend (1086) and frontend (1087)
#
# IMPORTANT PORT CONFIGURATION:
# - Backend (Django): Only accessible on port 1086 (internal)
# - Frontend (Next.js): Only accessible on port 1087 (internal)
# - Nginx: Public access on ports 80 (HTTP) and 443 (HTTPS)
# - Ports 1086 and 1087 should be blocked from external access by firewall

# Frontend - Next.js running in Docker on port 1087
# All frontend requests (/) are proxied here
upstream frontend {
    server 127.0.0.1:1087;
    keepalive 64;
}

# Backend - Django running in Docker on port 1086
# All API requests (/api/) and admin (/admin/) are proxied here
upstream backend_internal {
    server 127.0.0.1:1086;
    keepalive 64;
}

# Redirect HTTP to HTTPS
server {
    listen 80;
    listen [::]:80;
    server_name gnxsoft.com www.gnxsoft.com;
    
    # Let's Encrypt validation
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }
    
    # Redirect all other traffic to HTTPS
    location / {
        return 301 https://$server_name$request_uri;
    }
}

# HTTPS Server
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name gnxsoft.com www.gnxsoft.com;

    # SSL Configuration
    ssl_certificate /etc/letsencrypt/live/gnxsoft.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/gnxsoft.com/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384;
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

    # Security Headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
    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;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), interest-cohort=()" always;

    # Rate Limiting Zones
    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=general_limit:10m rate=100r/s;
    limit_req_status 429;

    # Client settings
    client_max_body_size 10M;
    client_body_timeout 30s;
    client_header_timeout 30s;

    # Logging
    access_log /var/log/nginx/gnxsoft_access.log;
    error_log /var/log/nginx/gnxsoft_error.log warn;

    # Root location - Frontend (Next.js on port 1087)
    location / {
        limit_req zone=general_limit burst=50 nodelay;
        
        proxy_pass http://frontend;
        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;
        
        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # API Proxy - Frontend talks to backend through this proxy
    # Backend runs in Docker on port 1086 (internal only)
    location /api/ {
        limit_req zone=api_limit burst=20 nodelay;
        
        # Internal proxy to backend Docker container (127.0.0.1:1086)
        proxy_pass http://backend_internal/api/;
        proxy_http_version 1.1;
        
        # Backend sees request as coming from nginx
        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_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Port $server_port;
        
        # Add internal API key (will be replaced by docker-start.sh)
        set $api_key "PLACEHOLDER_INTERNAL_API_KEY";
        proxy_set_header X-Internal-API-Key $api_key;
        
        # Hide backend server info
        proxy_hide_header X-Powered-By;
        proxy_hide_header Server;
        
        # Timeouts
        proxy_connect_timeout 30s;
        proxy_send_timeout 30s;
        proxy_read_timeout 30s;
        
        # CORS headers (if needed)
        add_header Access-Control-Allow-Origin "https://gnxsoft.com" always;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
        add_header Access-Control-Allow-Headers "Authorization, Content-Type, X-Internal-API-Key" always;
        add_header Access-Control-Allow-Credentials "true" always;
        
        # Handle preflight requests
        if ($request_method = 'OPTIONS') {
            return 204;
        }
    }

    # Media files - Served from Docker volume
    location /media/ {
        alias /home/gnx/Desktop/GNX-WEB/backEnd/media/;
        expires 30d;
        add_header Cache-Control "public, immutable";
        access_log off;
        
        # Security - deny execution of scripts
        location ~ \.(php|py|pl|sh)$ {
            deny all;
        }
    }

    # Static files - Served from Docker volume
    location /static/ {
        alias /home/gnx/Desktop/GNX-WEB/backEnd/staticfiles/;
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # Next.js static files
    location /_next/static/ {
        proxy_pass http://frontend;
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # Admin panel - Proxy to backend (with IP restriction)
    location /admin/ {
        # IP restriction is handled by Django middleware
        # Add internal API key (will be replaced by docker-start.sh)
        set $api_key "PLACEHOLDER_INTERNAL_API_KEY";
        proxy_set_header X-Internal-API-Key $api_key;
        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_pass http://backend_internal;
        proxy_redirect off;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        
        # Timeouts
        proxy_connect_timeout 30s;
        proxy_send_timeout 30s;
        proxy_read_timeout 30s;
    }

    # Deny access to hidden files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Health check endpoint
    location /health {
        access_log off;
        return 200 "OK\n";
        add_header Content-Type text/plain;
    }
}

# ==============================================================================
# IMPORTANT NOTES:
# ==============================================================================
# 1. Backend runs in Docker on port 1086 (internal only)
# 2. Frontend runs in Docker on port 1087
# 3. Nginx runs on host and proxies to Docker containers
# 4. Firewall should BLOCK external access to ports 1086 and 1087
# 5. Only nginx (ports 80, 443) should be accessible from internet
# 6. Set INTERNAL_API_KEY environment variable in nginx config or systemd service
# 7. Update media/static paths to match your actual deployment location
# ==============================================================================