# WebSocket settings
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

# Cache configuration
proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=STATIC:10m inactive=24h max_size=1g;

# API cache for frequently requested endpoints
proxy_cache_path /var/cache/nginx/api levels=1:2 keys_zone=API_CACHE:10m inactive=60m max_size=100m;

server {
    listen 80 default_server;

    # Large cookie support
    large_client_header_buffers 4 32k;
    proxy_buffer_size 32k;
    proxy_busy_buffers_size 48k;
    proxy_buffers 4 32k;

    # Logging
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    location ^~ /assets/ {
        proxy_pass http://127.0.0.1:3000;
        proxy_cache STATIC;
        proxy_cache_valid 200 302 24h;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;
        add_header Cache-Control "public, max-age=31536000, immutable";

        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;
    }

    location ^~ /_assets/ {
        proxy_pass http://127.0.0.1:3000;
        proxy_cache STATIC;
        proxy_cache_valid 200 302 24h;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;
        add_header Cache-Control "public, max-age=31536000, immutable";

        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;
    }

    location ~* ^/w(\d+)(/(?:assets|_assets)/.*)$ {
        set $worker $1;
        proxy_pass http://127.0.0.1:$worker_port$2$is_args$args;
        proxy_cache STATIC;
        proxy_cache_valid 200 302 24h;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;
        add_header Cache-Control "public, max-age=31536000, immutable";

        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;
    }

    # Worker locations - Processing this first so worker-specific requests are handled by workers
    # This prevents static file regexes from capturing worker requests
    location ~* ^/w(\d+)(/.*)?$ {
        set $worker $1;
        # Preserve query string by appending $is_args$args
        proxy_pass http://127.0.0.1:$worker_port$2$is_args$args;
        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;
    }

    # Randomly distribute new-game creation across the live workers; the worker
    # mints a self-owned id and returns it. The openfront_workers upstream is
    # generated at container start from NUM_WORKERS (generate-nginx-upstream.sh)
    # and can be reused by any future endpoint that wants the same balancing.
    location = /api/create_game {
        proxy_pass http://openfront_workers;
        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;
    }

    # Admin bot create-game: same random-worker balancing as /api/create_game.
    # The worker checks the admin bot key, mints a self-owned id, and returns it.
    location = /api/adminbot/create_game {
        proxy_pass http://openfront_workers;
        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;
    }

    # Static file handling with proper MIME types and consistent caching
    location ~* \.(jpg|jpeg|png|gif|ico|svg|webp|woff|woff2|ttf|eot)$ {
        proxy_pass http://127.0.0.1:3000;

        # Include MIME types
        include /etc/nginx/mime.types;

        # Cache configuration for static files
        proxy_cache STATIC;
        proxy_cache_valid 200 302 24h;  # Cache successful responses for 24 hours
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;

        # Show cache status in response headers
        add_header X-Cache-Status $upstream_cache_status;

        # Standard proxy headers
        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;

        # Default cache policy for static files
        add_header Cache-Control "public, max-age=86400";  # 24 hours
    }

    # /api/health endpoint - No caching, always hit the backend
    location = /api/health {
        proxy_pass http://127.0.0.1:3000;
        proxy_http_version 1.1;

        # Cache configuration - No caching for health checks
        proxy_cache off;
        add_header X-Cache-Status "BYPASS";
        add_header Cache-Control "no-store, no-cache, must-revalidate, proxy-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";

        # Standard proxy headers
        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;
    }

    # /commit.txt endpoint - Cache for 5 seconds
    location = /commit.txt {
        proxy_pass http://127.0.0.1:3000;
        proxy_http_version 1.1;

        # Cache configuration
        proxy_cache API_CACHE;
        proxy_cache_valid 200 5s;  # Cache successful responses for 5 seconds
        proxy_cache_use_stale error timeout http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;

        # Standard proxy headers
        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;
    }

    # Binary files caching
    location ~* \.(bin|dat|exe|dll|so|dylib)$ {
        proxy_pass http://127.0.0.1:3000;
        add_header Cache-Control "public, max-age=31536000, immutable";  # 1 year for binary files

        proxy_cache STATIC;
        proxy_cache_valid 200 302 24h;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;

        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;
    }

    # Specific file type caching rules (outside the /static/ location)
    location ~* \.js$ {
        proxy_pass http://127.0.0.1:3000;
        add_header Content-Type application/javascript;
        add_header Cache-Control "public, max-age=31536000, immutable";  # 1 year for JS files

        proxy_cache STATIC;
        proxy_cache_valid 200 302 24h;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;

        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;
    }

    location ~* \.css$ {
        proxy_pass http://127.0.0.1:3000;
        add_header Content-Type text/css;
        add_header Cache-Control "public, max-age=31536000, immutable";  # 1 year for CSS files

        proxy_cache STATIC;
        proxy_cache_valid 200 302 24h;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;

        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;
    }

    # Updated HTML file caching - 1 second cache
    location ~* \.html$ {
        proxy_pass http://127.0.0.1:3000;
        add_header Content-Type text/html;
        add_header Cache-Control "public, max-age=1";  # 1 second for HTML files

        proxy_cache STATIC;
        proxy_cache_valid 200 302 1s;  # Cache successful responses for 1 second
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;

        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;
    }


    # Root location with short shared cache for the app shell
    location = / {
        proxy_pass http://127.0.0.1:3000;

        # Cache the shared app shell briefly at the proxy; browser/CDN policy
        # comes from the upstream Cache-Control header.
        proxy_cache STATIC;
        proxy_cache_valid 200 302 300s;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;

        # Show cache status in response headers
        add_header X-Cache-Status $upstream_cache_status;

        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;
    }

    # Default location for all other requests
    location / {
        proxy_pass http://127.0.0.1:3000;
        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;
    }

}