{ pkgs, config, lib, ... }:
let
  cfg = config.myServices.tools.cryptpad.farm;
  toService = name:
    let
      inherit (cfg.hosts.${name}) package config;
    in {
      description = "Cryptpad ${name} Service";
      wantedBy = [ "multi-user.target" ];
      after = [ "networking.target" ];
      serviceConfig = {
        User = "cryptpad";
        Group = "cryptpad";
        Environment = [
          "CRYPTPAD_CONFIG=${config}"
          "HOME=%S/cryptpad/${name}"
        ];
        ExecStart = "${package}/bin/cryptpad";
        PrivateTmp = true;
        Restart = "always";
        StateDirectory = "cryptpad/${name}";
        WorkingDirectory = "%S/cryptpad/${name}";
      };
    };
  toVhostRoot = name: "${cfg.hosts.${name}.package}/lib/node_modules/cryptpad";
  toVhost = name:
    let
      inherit (cfg.hosts.${name}) package domain port;
      api_domain = domain;
      files_domain = domain;
    in ''
      RewriteEngine On

      Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"
      Header set X-XSS-Protection "1; mode=block"
      Header set X-Content-Type-Options "nosniff"
      Header set Access-Control-Allow-Origin "*"
      Header set Permissions-Policy "interest-cohort=()"

      Header set Cross-Origin-Resource-Policy "cross-origin"
      <If "%{REQUEST_URI} =~ m#^/(sheet|presentation|doc)/.*$#">
        Header set Cross-Origin-Opener-Policy "same-origin"
      </If>
      Header set Cross-Origin-Embedder-Policy "require-corp"

      ErrorDocument 404 /customize.dist/404.html

      <If "%{QUERY_STRING} =~ m#ver=.*?#">
        Header set Cache-Control "max-age=31536000"
      </If>
      <If "%{REQUEST_URI} =~ m#^/.*(\/|\.html)$#">
        Header set Cache-Control "no-cache"
      </If>

      SetEnv styleSrc   "'unsafe-inline' 'self' ${domain}"
      SetEnv connectSrc "'self' https://${domain} ${domain} https://${api_domain} blob: wss://${api_domain} ${api_domain} ${files_domain}"
      SetEnv fontSrc    "'self' data: ${domain}"
      SetEnv imgSrc     "'self' data: * blob: ${domain}"
      SetEnv frameSrc   "'self' blob:"
      SetEnv mediaSrc   "'self' data: * blob: ${domain}"
      SetEnv childSrc   "https://${domain}"
      SetEnv workerSrc  "https://${domain}"
      SetEnv scriptSrc  "'self' 'unsafe-eval' 'unsafe-inline' resource: ${domain}"

      Header set Content-Security-Policy "default-src 'none'; child-src %{childSrc}e; worker-src %{workerSrc}e; media-src %{mediaSrc}e; style-src %{styleSrc}e; script-src %{scriptSrc}e; connect-src %{connectSrc}e; font-src %{fontSrc}e; img-src %{imgSrc}e; frame-src %{frameSrc}e;"

      RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC]
      RewriteCond %{HTTP:CONNECTION} Upgrade$ [NC]
      RewriteRule .* ws://localhost:${toString port}%{REQUEST_URI} [P,NE,QSA,L]

      RewriteRule ^/customize/(.*)$ /customize.dist/$1 [L]

      ProxyPassMatch "^/(api/(config|broadcast).*)$" "http://localhost:${toString port}/$1"
      ProxyPassReverse /api http://localhost:${toString port}/api
      ProxyPreserveHost On
      RequestHeader set X-Real-IP %{REMOTE_ADDR}s

      Alias /blob /var/lib/cryptpad/${name}/blob
      <Directory /var/lib/cryptpad/${name}/blob>
        Require all granted
        AllowOverride None
      </Directory>
      Alias /block /var/lib/cryptpad/${name}/block
      <Directory /var/lib/cryptpad/${name}/block>
        Require all granted
        AllowOverride None
      </Directory>
      <LocationMatch /blob/>
        Header set Cache-Control "max-age=31536000"
        Header set Access-Control-Allow-Origin "*"
        Header set Access-Control-Allow-Methods "GET, POST, OPTIONS"
        Header set Access-Control-Allow-Headers "DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Content-Length"
        Header set Access-Control-Expose-Headers "DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Content-Length"

        RewriteCond %{REQUEST_METHOD} OPTIONS
        RewriteRule ^(.*)$ $1 [R=204,L]
      </LocationMatch>

      <LocationMatch /block/>
        Header set Cache-Control "max-age=0"
      </locationMatch>

      RewriteRule ^/(register|login|settings|user|pad|drive|poll|slide|code|whiteboard|file|media|profile|contacts|todo|filepicker|debug|kanban|sheet|support|admin|notifications|teams|calendar|presentation|doc)$ $1/ [R=302,L]

      RewriteCond %{DOCUMENT_ROOT}/www/%{REQUEST_URI} -f
      RewriteRule (.*) /www/$1 [L]

      RewriteCond %{DOCUMENT_ROOT}/www/%{REQUEST_URI}/index.html -f
      RewriteRule (.*) /www/$1/index.html [L]

      RewriteCond %{DOCUMENT_ROOT}/customize.dist/%{REQUEST_URI} -f
      RewriteRule (.*) /customize.dist/$1 [L]

      <Directory ${package}/lib/node_modules/cryptpad/www>
        AllowOverride None
        Require all granted
        DirectoryIndex index.html
      </Directory>
      <Directory ${package}/lib/node_modules/cryptpad/customize.dist>
        AllowOverride None
        Require all granted
        DirectoryIndex index.html
      </Directory>
      '';
in
{
  options.myServices.tools.cryptpad.farm = {
    hosts = lib.mkOption {
      default = {};
      description = "Hosts to install";
      type = lib.types.attrsOf (lib.types.submodule {
        options = {
          port = lib.mkOption {
            type = lib.types.port;
          };
          package = lib.mkOption {
            type = lib.types.package;
            description = "Cryptpad package to use";
            default = pkgs.cryptpad;
          };
          domain = lib.mkOption {
            type = lib.types.str;
            description = "Domain for main host";
          };
          config = lib.mkOption {
            type = lib.types.path;
            description = "Path to configuration";
          };
        };
      });
    };
    vhosts = lib.mkOption {
      description = "Instance vhosts configs";
      readOnly = true;
      type = lib.types.attrsOf lib.types.str;
      default = lib.genAttrs (builtins.attrNames cfg.hosts) toVhost;
    };
    vhostRoots = lib.mkOption {
      description = "Instance vhosts document roots";
      readOnly = true;
      type = lib.types.attrsOf lib.types.path;
      default = lib.genAttrs (builtins.attrNames cfg.hosts) toVhostRoot;
    };
  };
  config = {
    users.users = lib.optionalAttrs (cfg.hosts != {}) {
      cryptpad = {
        uid = config.ids.uids.cryptpad;
        group = "cryptpad";
        description = "Cryptpad user";
      };
    };
    users.groups = lib.optionalAttrs (cfg.hosts != {}) {
      cryptpad = {
        gid = config.ids.gids.cryptpad;
      };
    };
    systemd.services = lib.listToAttrs (map (n: lib.nameValuePair "cryptpad-${n}" (toService n)) (builtins.attrNames cfg.hosts));
  };
}