# No user directive needed for non-root containers
worker_processes auto;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

http {
    # Basic Settings
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 100M;
    server_tokens off;

    # MIME Types
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    # Logging - Output to stdout/stderr for container log collection
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    
    log_format timed '$remote_addr - $remote_user [$time_local] "$request" '
                     '$status $body_bytes_sent "$http_referer" '
                     '"$http_user_agent" "$http_x_forwarded_for" '
                     'rt=$request_time uct=$upstream_connect_time uht=$upstream_header_time urt=$upstream_response_time';
    
    access_log /dev/stdout timed;
    error_log /dev/stderr warn;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        application/activity+json
        application/ld+json
        image/svg+xml;

    # Rate limiting removed - handled at ingress level for better client IP detection

    # Upstream for uWSGI
    upstream piefed_app {
        server 127.0.0.1:8000;
        keepalive 2;
    }

    server {
        listen 80;
        server_name _;
        
        # Security headers
        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;
        
        # HTTPS enforcement and mixed content prevention
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header Content-Security-Policy "upgrade-insecure-requests" always;

        # Real IP forwarding (for Kubernetes ingress)
        real_ip_header X-Forwarded-For;
        set_real_ip_from 10.0.0.0/8;
        set_real_ip_from 172.16.0.0/12;
        set_real_ip_from 192.168.0.0/16;

        # Serve static files directly with nginx (following PieFed official recommendation)
        location /static/ {
            alias /app/app/static/;
            expires max;
            add_header Cache-Control "public, max-age=31536000, immutable";
            add_header Vary "Accept-Encoding";
            
            # Security headers for static assets
            add_header X-Frame-Options "SAMEORIGIN" always;
            add_header X-Content-Type-Options "nosniff" always;
            add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
            add_header Content-Security-Policy "upgrade-insecure-requests" always;
            
            # Handle trailing slashes gracefully
            try_files $uri $uri/ =404;
        }

        # Media files (user uploads) - long cache since they don't change
        location /media/ {
            alias /app/media/;
            expires 1d;
            add_header Cache-Control "public, max-age=31536000";
        }

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

        # NodeInfo endpoints - no override needed, PieFed already sets application/json correctly
        location ~ ^/nodeinfo/ {
            proxy_pass http://piefed_app;
            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 https;
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }

        # Webfinger endpoint - ensure correct Content-Type per WebFinger spec
        location ~ ^/\.well-known/webfinger {
            proxy_pass http://piefed_app;
            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 https;
            # Force application/jrd+json Content-Type for webfinger (per WebFinger spec)
            proxy_hide_header Content-Type;
            add_header Content-Type "application/jrd+json" always;
            # Ensure CORS headers are present for federation discovery
            add_header Access-Control-Allow-Origin "*" always;
            add_header Access-Control-Allow-Methods "GET, OPTIONS" always;
            add_header Access-Control-Allow-Headers "Content-Type, Authorization, Accept, User-Agent" always;
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }

        # API and federation endpoints
        location ~ ^/(api|\.well-known|inbox) {
            proxy_pass http://piefed_app;
            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 https;  # Force HTTPS scheme
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }

        # All other requests
        location / {
            proxy_pass http://piefed_app;
            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 https;  # Force HTTPS scheme
            proxy_connect_timeout 30s;
            proxy_send_timeout 30s;
            proxy_read_timeout 30s;
        }

        # Error pages
        error_page 404 /404.html;
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root /usr/share/nginx/html;
        }
    }
}