{ lib, config, pkgs, serviceBase, ... }:
let
  localhost = config.my.servers.settings.localhost;
  port = 8096;
in {
  options.my.servers.jellyfin.enable = lib.mkEnableOption "enable";
  config = lib.mkIf config.my.servers.jellyfin.enable {
    environment.systemPackages = [ pkgs.jellyfin-ffmpeg ];
    services = {
      jellyfin = serviceBase // { };
      nginx = {
        enable = true;
        appendHttpConfig = ''
          # JELLYFIN
          proxy_cache_path /var/cache/nginx/jellyfin-videos levels=1:2 keys_zone=jellyfin-videos:100m inactive=90d max_size=35000m;
          proxy_cache_path /var/cache/nginx/jellyfin levels=1:2 keys_zone=jellyfin:100m max_size=15g inactive=30d use_temp_path=off;
          map $request_uri $h264Level { ~(h264-level=)(.+?)& $2; }
          map $request_uri $h264Profile { ~(h264-profile=)(.+?)& $2; }
        '';
        virtualHosts = {
          "flix.${config.my.servers.settings.domain}" = {
            forceSSL = true;
            enableACME = true;
            http2 = true;
            extraConfig = ''
              # use a variable to store the upstream proxy
              # in this example we are using a hostname which is resolved via DNS
              # (if you aren't using DNS remove the resolver line and change the variable to point to an IP address
              resolver ${localhost} valid=30;

              location = / {
                return 302 http://$host/web/;
                #return 302 https://$host/web/;
              }

              location = /web/ {
                # Proxy main Jellyfin traffic
                proxy_pass http://${localhost}:${toString port}/web/index.html;
                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;
                proxy_set_header X-Forwarded-Protocol $scheme;
                proxy_set_header X-Forwarded-Host $http_host;
              }
            '';
            locations = {
              "/" = {
                proxyPass = "http://${localhost}:${toString port}";
                proxyWebsockets = true;
              };
              "/socket" = {
                proxyPass = "http://${localhost}:${toString port}";
                extraConfig = ''
                  proxy_http_version 1.1;
                  proxy_set_header Upgrade $http_upgrade;
                  proxy_set_header Connection "upgrade";
                '';
              };
              "~ /Items/(.*)/Images" = {
                proxyPass = "http://${localhost}:${toString port}";
                extraConfig = ''
                  proxy_cache jellyfin;
                  proxy_cache_revalidate on;
                  proxy_cache_lock on;
                '';
              };
              "~* ^/Videos/(.*)/(?!live)" = {
                proxyPass = "http://${localhost}:${toString port}";
                extraConfig = ''
                  # Set size of a slice (this amount will be always requested from the backend by nginx)
                  # Higher value means more latency, lower more overhead
                  # This size is independent of the size clients/browsers can request
                  # slice 2m;

                  proxy_cache jellyfin-videos;
                  proxy_cache_valid 200 206 301 302 30d;
                  proxy_ignore_headers Expires Cache-Control Set-Cookie X-Accel-Expires;
                  proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;
                  proxy_connect_timeout 15s;
                  proxy_http_version 1.1;
                  proxy_set_header Connection "";
                  # Transmit slice range to the backend
                  proxy_set_header Range 2m;

                  # This saves bandwidth between the proxy and jellyfin, as a file is only downloaded one time instead of multiple times when multiple clients want to at the same time
                  # The first client will trigger the download, the other clients will have to wait until the slice is cached
                  # Esp. practical during SyncPlay
                  proxy_cache_lock on;
                  proxy_cache_lock_age 60s;

                  proxy_cache_key "jellyvideo$uri?MediaSourceId=$arg_MediaSourceId&VideoCodec=$arg_VideoCodec&AudioCodec=$arg_AudioCodec&AudioStreamIndex=$arg_AudioStreamIndex&VideoBitrate=$arg_VideoBitrate&AudioBitrate=$arg_AudioBitrate&SubtitleMethod=$arg_SubtitleMethod&TranscodingMaxAudioChannels=$arg_TranscodingMaxAudioChannels&RequireAvc=$arg_RequireAvc&SegmentContainer=$arg_SegmentContainer&MinSegments=$arg_MinSegments&BreakOnNonKeyFrames=$arg_BreakOnNonKeyFrames&h264-profile=$h264Profile&h264-level=$h264Level&slicerange=2m";

                  # add_header X-Cache-Status $upstream_cache_status; # This is only for debugging cache
                '';
              };
            };
          };
        };
      };
    };
  };
}