{pkgs, lib, config, system, ...}:
let inherit (lib) types;
    inherit (config.services) nginx x509;
    logDir    = "/var/log/nginx";
    domainDir = dom: lib.concatStringsSep "/" (lib.reverseList (lib.splitString "." dom));
in
{
imports = [
  nginx/gitweb.nix
];
options.services.nginx.webDir = lib.mkOption {
  type    = types.str;
  default = "/var/www"; # TODO: /var/lib/nginx ?
};
config = {
  security.dhparams = {
    enable = true;
    params = {
      nginx = 1024;
    };
  };
  services.nginx = {
    enable = true;
    stateDir = "/dev/shm/nginx";
    eventsConfig = ''
      multi_accept on;
      use epoll;
      worker_connections 1024;
    '';
    clientMaxBodySize = "20m";
    recommendedProxySettings = true;
    recommendedTlsSettings = true;
    serverTokens = false;
    sslCiphers = "HIGH:!ADH:!MD5:!CAMELLIA:!SEED:!3DES:!DES:!RC4:!eNULL";
    #sslCiphers = "EECDH+aRSA+AESGCM:EDH+aRSA:EECDH+aRSA:+AES256:+AES128:+SHA1:!CAMELLIA:!SEED:!3DES:!DES:!RC4:!eNULL;";
    #sslProtocols = "TLSv1.2";
    commonHttpConfig = ''
      log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
      #charset UTF-8;
      '' +
      lib.concatStringsSep "\n" (lib.attrValues {
        default = ''
          default_type application/octet-stream;
          root ${nginx.webDir};
        '';
        security = ''
          error_page 403 = 404;
          #ssl_certificate     ${x509.cert};
          #ssl_certificate_key ${x509.key};
        '';
        log = ''
          access_log ${logDir}/access.log main buffer=32k;
          error_log  ${logDir}/error.log warn;
          open_log_file_cache max=1000 inactive=20s min_uses=2 valid=1m;
        '';
        proxy = ''
          proxy_cache_use_stale updating;
          proxy_temp_path ${nginx.stateDir}/proxy_temp 1 2;
        '';
        fastcgi = ''
          # DOC: http://wiki.nginx.org/HttpFastcgiModule
          fastcgi_buffer_size 128k;
          fastcgi_buffers 256 4k;
          fastcgi_busy_buffers_size 256k;
          fastcgi_cache_key "$request_method $scheme://$http_host$request_uri";
          fastcgi_cache_path ${nginx.stateDir}/fastcgi_cache
                             inactive=10m
                             keys_zone=microcache:2M
                             levels=1:2
                             loader_files=100000
                             loader_sleep=1
                             loader_threshold=2592000000
                             max_size=64M;
          fastcgi_connect_timeout 60;
          fastcgi_ignore_client_abort off;
          fastcgi_intercept_errors on;
          fastcgi_max_temp_file_size 2M;
          #fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
          fastcgi_param SCRIPT_FILENAME $request_filename;
          fastcgi_temp_path ${nginx.stateDir}/fastcgi_temp 1 2;
        '';
        connexion = ''
          sendfile on;
          send_timeout 60;
            # ^ If the client stops reading data,
            # free up the stale client connection after this much time.
          tcp_nopush on;
            # ^ Causes nginx to attempt to send its HTTP response head
            # in one packet, instead of using partial frames.
            # This is useful for prepending headers before calling sendfile,
            # or for throughput optimization.
          tcp_nodelay on;
            # ^ Don't buffer data-sends (disable Nagle algorithm).
            # Good for sending frequent small bursts of data in real time.
          keepalive_timeout 20;
          reset_timedout_connection on;
          server_names_hash_bucket_size 128;
          types_hash_max_size 2048;
        '';
        map = ''
          # User agents that are to be blocked.
          #map $http_user_agent $bad_bot {
          #  default 0;
          #  libwww-perl 1;
          #  ~(?i)(httrack|htmlparser|libwww) 1;
          #}
          # Referrers that are to be blocked.
          #map $http_referer $bad_referer {
          #  default 0;
          #  ~(?i)(babes|casino|click|diamond|forsale|girl|jewelry|love|nudit|organic|poker|porn|poweroversoftware|replica|sex|teen|webcam|zippo) 1;
          #}
          #geo $not_local {
          #  default 1;
          #  127.0.0.1 0;
          #}
        '';
        gzip = ''
          gzip on;
          gzip_buffers 16 8k;
          gzip_comp_level 6;
          gzip_disable "MSIE [1-6]\.";
          gzip_http_version 1.1;
          gzip_min_length 1024;
          gzip_proxied any;
          gzip_static on;
          gzip_vary on;
          gzip_types application/atom+xml
                     application/javascript
                     application/json
                     application/rss+xml
                     application/vnd.ms-fontobject
                     application/x-font-ttf
                     application/x-javascript
                     application/xml
                     application/xml+rss
                     font/opentype
                     font/truetype
                     image/svg+xml
                     text/css
                     text/javascript
                     text/plain
                     text/x-component
                     text/xml;
        '';
        cache = ''
          client_body_buffer_size 4K;
            # ^ getconf PAGESIZE
            # 4096
          client_body_temp_path ${nginx.stateDir}/client_body_temp 1 2;
          client_body_timeout 60;
          client_header_buffer_size 1k;
          client_header_timeout 60;
          large_client_header_buffers 4 8k;
          
          open_file_cache max=200000 inactive=20s;
          open_file_cache_errors on;
          open_file_cache_min_uses 2;
          open_file_cache_valid 30s;
        '';
      });
    appendConfig = ''
      worker_processes 2;
    '';
  };
};
}