# From https://github.com/frappe/frappe_docker/blob/main/resources/nginx-template.conf
{ writeText
, nginx
, frappe-erpnext-assets
}:
let
  backend = "127.0.0.1:9090";
  socketio = "127.0.0.1:3000";
  frappe_site_name_header = "localhost";
  upstream_real_ip_address = "127.0.0.1";
  upstream_real_ip_header = "X-Forwarded-For";
  upstream_real_ip_recursive = "off";
  client_max_body_size = "50m";
  proxy_read_timeout = "120";
in
writeText "erpnext.conf" ''
upstream backend-server {
    server ${backend} fail_timeout=0;
}

upstream socketio-server {
    server ${socketio} fail_timeout=0;
}

# Parse the X-Forwarded-Proto header - if set - defaulting to $scheme.
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
    default $scheme;
    https https;
}

server {
    listen 8081;
    server_name ${frappe_site_name_header};
    root ${frappe-erpnext-assets}/share/sites;

    proxy_buffer_size 128k;
    proxy_buffers 4 256k;
    proxy_busy_buffers_size 256k;

    add_header X-Frame-Options "SAMEORIGIN";
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header Referrer-Policy "same-origin, strict-origin-when-cross-origin";

    set_real_ip_from ${upstream_real_ip_address};
    real_ip_header ${upstream_real_ip_header};
    real_ip_recursive ${upstream_real_ip_recursive};

    location /assets {
        try_files $uri =404;
    }

    location ~ ^/protected/(.*) {
        internal;
        try_files /${frappe_site_name_header}/$1 =404;
    }

    location /socket.io {
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header X-Frappe-Site-Name ${frappe_site_name_header};
        proxy_set_header Origin $scheme://${frappe_site_name_header};
        proxy_set_header Host $host;

        proxy_pass http://socketio-server;
    }

    location / {
        rewrite ^(.+)/$ $proxy_x_forwarded_proto://${frappe_site_name_header}$1 permanent;
        rewrite ^(.+)/index\.html$ $proxy_x_forwarded_proto://${frappe_site_name_header}$1 permanent;
        rewrite ^(.+)\.html$ $proxy_x_forwarded_proto://${frappe_site_name_header}$1 permanent;

        location ~ ^/files/.*.(htm|html|svg|xml) {
            # TODO: Figure out how to do this.
            # add_header Content-disposition "attachment";
            try_files /${frappe_site_name_header}/public/$uri @webserver;
        }

        try_files /${frappe_site_name_header}/public/$uri @webserver;
    }

    location @webserver {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
        proxy_set_header X-Frappe-Site-Name ${frappe_site_name_header};
        proxy_set_header Host $host;
        proxy_set_header X-Use-X-Accel-Redirect True;
        proxy_read_timeout ${proxy_read_timeout};
        proxy_redirect off;

        proxy_pass  http://backend-server;
    }

    # optimizations
    sendfile on;
    keepalive_timeout 15;
    client_max_body_size ${client_max_body_size};
    client_body_buffer_size 16K;
    client_header_buffer_size 1k;

    # enable gzip compression
    # based on https://mattstauffer.co/blog/enabling-gzip-on-nginx-servers-including-laravel-forge
    gzip on;
    gzip_http_version 1.1;
    gzip_comp_level 5;
    gzip_min_length 256;
    gzip_proxied any;
    gzip_vary on;
    gzip_types
        application/atom+xml
        application/javascript
        application/json
        application/rss+xml
        application/vnd.ms-fontobject
        application/x-font-ttf
        application/font-woff
        application/x-web-app-manifest+json
        application/xhtml+xml
        application/xml
        font/opentype
        image/svg+xml
        image/x-icon
        text/css
        text/plain
        text/x-component;
        # text/html is always compressed by HttpGzipModule
}
''