# Full nginx configuration — rendered to /etc/nginx/nginx.conf
# (NOT placed in conf.d/ to avoid include nesting issues with Alpine nginx)

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format kmtn_json escape=json
        '{'
            '"time":"$time_iso8601",'
            '"remote_addr":"$remote_addr",'
            '"x_forwarded_for":"$http_x_forwarded_for"'
        '}';

    access_log /logs/access.log kmtn_json;
    sendfile on;

    upstream ssr_backend {
        server 127.0.0.1:4200;
    }

    server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Serve static assets directly from disk (hashed filenames are immutable)
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot|map)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # Dynamic sitemap.xml + robots.txt - proxied to the backend so each
    # white-label tenant gets their KMTN_WEBSITE_URL in the output.
    location = /sitemap.xml {
        proxy_pass __API_UPSTREAM__/api/sitemap/sitemap.xml;
        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 $http_x_forwarded_proto;
    }

    location = /robots.txt {
        proxy_pass __API_UPSTREAM__/api/sitemap/robots.txt;
        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 $http_x_forwarded_proto;
    }

    # Proxy API calls to the backend service
    location /api/ {
        proxy_pass __API_UPSTREAM__;
        proxy_set_header Host $host;
        proxy_set_header Origin $http_origin;
        proxy_set_header Referer $http_referer;
        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 $http_x_forwarded_proto;
        proxy_set_header X-Forwarded-Host $host;

        # Disable caching through the double-proxy chain
        proxy_cache off;
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;
        add_header Pragma "no-cache" always;
        add_header Vary "*" always;
    }

    # Proxy all page requests to the Angular SSR server.
    # The SSR server handles both spider SSR rendering and serves CSR shells
    # to regular users, with fresh station config injected at runtime.
    location / {
        proxy_pass http://ssr_backend;
        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 $http_x_forwarded_proto;
        proxy_set_header X-Forwarded-Host $host;

        # SSR responses should not be cached by intermediate proxies
        proxy_cache off;
        add_header X-Powered-By "Angular SSR" always;

        # Prevent browsers from caching HTML pages — content changes frequently
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header Pragma "no-cache" always;
    }
}
}