{ lib, pkgs, config,  ... }:
let
  env = config.myEnv.tools.etherpad-lite;
  cfg = config.myServices.websites.tools.etherpad-lite;
  # Make sure we’re not rebuilding whole libreoffice just because of a
  # dependency
  libreoffice = (import <nixpkgs> { overlays = []; }).libreoffice-fresh;
  ecfg = config.services.etherpad-lite;
in {
  options.myServices.websites.tools.etherpad-lite = {
    enable = lib.mkEnableOption "enable etherpad's website";
  };

  config = lib.mkIf cfg.enable {
    services.duplyBackup.profiles.etherpad-lite = {
      rootDir = "/var/lib/private/etherpad-lite";
    };
    secrets.keys = {
      "webapps/tools-etherpad-apikey" = {
        permissions = "0400";
        text = env.api_key;
      };
      "webapps/tools-etherpad-sessionkey" = {
        permissions = "0400";
        text = env.session_key;
      };
      "webapps/tools-etherpad" = {
        permissions = "0400";
        text = ''
          {
            "title": "Etherpad",
            "favicon": "favicon.ico",
            "skinName": "colibris",
            "skinVariants": "dark-toolbar light-background super-light-editor full-width-editor",

            "ip": "",
            "port" : "${ecfg.sockets.node}",
            "showSettingsInAdminPage" : false,
            "dbType" : "postgres",
            "dbSettings" : {
              "user"    : "${env.postgresql.user}",
              "host"    : "${env.postgresql.socket}",
              "password": "${env.postgresql.password}",
              "database": "${env.postgresql.database}",
              "charset" : "utf8mb4"
            },

            "defaultPadText" : "Welcome to Etherpad!\n\nThis pad text is synchronized as you type, so that everyone viewing this page sees the same text. This allows you to collaborate seamlessly on documents!\n\nGet involved with Etherpad at http:\/\/etherpad.org\n",
            "padOptions": {
              "noColors": false,
              "showControls": true,
              "showChat": true,
              "showLineNumbers": true,
              "useMonospaceFont": false,
              "userName": false,
              "userColor": false,
              "rtl": false,
              "alwaysShowChat": false,
              "chatAndUsers": false,
              "lang": "fr"
            },

            "suppressErrorsInPadText" : false,
            "requireSession" : false,
            "editOnly" : false,
            "sessionNoPassword" : false,
            "minify" : true,
            "maxAge" : 21600,
            "abiword" : null,
            "soffice" : "${libreoffice}/bin/soffice",
            "tidyHtml" : "",
            "allowUnknownFileEnds" : true,
            "requireAuthentication" : false,
            "requireAuthorization" : false,
            "trustProxy" : false,
            "disableIPlogging" : false,
            "automaticReconnectionTimeout" : 0,
            "scrollWhenFocusLineIsOutOfViewport": {
              "percentage": {
                "editionAboveViewport": 0,
                "editionBelowViewport": 0
              },
              "duration": 0,
              "scrollWhenCaretIsInTheLastLineOfViewport": false,
              "percentageToScrollWhenUserPressesArrowUp": 0
            },
            "users": {
              "admin": {
                "password": "${env.adminPassword}",
                "is_admin": true
              },
              "ldapauth": {
                "hash": "invalid",
                "url": "ldaps://${env.ldap.host}",
                "accountBase": "${env.ldap.base}",
                "accountPattern": "${env.ldap.filter}",
                "displayNameAttribute": "cn",
                "searchDN": "${env.ldap.dn}",
                "searchPWD": "${env.ldap.password}",
                "groupSearchBase": "${env.ldap.base}",
                "groupAttribute": "member",
                "groupAttributeIsDN": true,
                "searchScope": "sub",
                "groupSearch": "${env.ldap.group_filter}",
                "anonymousReadonly": false
              }
            },
            "ep_mypads": {
              "warning": "This hash is stored in database, changing anything here will not have any consequence",
              "ldap": {
                "url": "ldaps://${env.ldap.host}",
                "bindDN": "${env.ldap.dn}",
                "bindCredentials": "${env.ldap.password}",
                "searchBase": "${env.ldap.base}",
                "searchFilter": "${env.ldap.filter}",
                "properties": {
                  "login": "uid",
                  "email": "mail",
                  "firstname": "givenName",
                  "lastname": "sn"
                },
                "defaultLang": "fr"
              }
            },
            "ep_comments_page": {
              "displayCommentAsIcon": true,
              "highlightSelectedText": true
            },
            "socketTransportProtocols" : ["xhr-polling", "jsonp-polling", "htmlfile"],
            "loadTest": false,
            "indentationOnNewLine": false,
            "toolbar": {
              "left": [
                ["bold", "italic", "underline", "strikethrough"],
                ["orderedlist", "unorderedlist", "indent", "outdent"],
                ["undo", "redo"],
                ["clearauthorship"]
              ],
              "right": [
                ["importexport", "timeslider", "savedrevision"],
                ["settings", "embed"],
                ["showusers"]
              ],
              "timeslider": [
                ["timeslider_export", "timeslider_returnToPad"]
              ]
            },
            "loglevel": "INFO",
            "logconfig" : { "appenders": [ { "type": "console" } ] }
          }
        '';
      };
    };
    services.etherpad-lite = {
      enable = true;
      package = pkgs.webapps.etherpad-lite.withModules (p: [
        p.ep_align p.ep_bookmark p.ep_colors p.ep_comments_page
        p.ep_cursortrace p.ep_delete_empty_pads p.ep_embedmedia
        p.ep_font_size p.ep_headings2 p.ep_immae_buttons p.ep_ldapauth
        p.ep_line_height p.ep_markdown p.ep_mypads p.ep_page_view
        p.ep_previewimages p.ep_ruler p.ep_scrollto
        p.ep_set_title_on_pad p.ep_subscript_and_superscript
        p.ep_timesliderdiff
      ]);
      modules = [];
      sessionKeyFile = config.secrets.fullPaths."webapps/tools-etherpad-sessionkey";
      apiKeyFile = config.secrets.fullPaths."webapps/tools-etherpad-apikey";
      configFile = config.secrets.fullPaths."webapps/tools-etherpad";
    };

    systemd.services.etherpad-lite.serviceConfig.SupplementaryGroups = "keys";
    # Needed so that they get in the closure
    systemd.services.etherpad-lite.path = [ libreoffice pkgs.html-tidy ];

    services.filesWatcher.etherpad-lite = {
      restart = true;
      paths = [ ecfg.sessionKeyFile ecfg.apiKeyFile ecfg.configFile ];
    };

    services.websites.env.tools.modules = [
      "headers" "proxy" "proxy_http" "proxy_wstunnel"
    ];
    services.websites.env.tools.vhostConfs.etherpad-lite = {
      certName    = "eldiron";
      addToCerts  = true;
      hosts       = [ "ether.immae.eu" ];
      root        = null;
      extraConfig = [ ''
        Header always set Strict-Transport-Security "max-age=31536000; includeSubdomains;"
        RequestHeader set X-Forwarded-Proto "https"

        RewriteEngine On

        RewriteMap  redirects "txt:${pkgs.writeText "redirects.txt" config.myEnv.tools.etherpad-lite.redirects}"
        RewriteCond %{QUERY_STRING}         "!noredirect"
        RewriteCond %{REQUEST_URI}          "^(.*)$"
        RewriteCond ''${redirects:$1|Unknown} "!Unknown"
        RewriteRule "^(.*)$"                ''${redirects:$1}  [L,NE,R=301,QSD]

        RewriteCond %{REQUEST_URI}  ^/socket.io            [NC]
        RewriteCond %{QUERY_STRING} transport=websocket    [NC]
        RewriteRule /(.*)           unix://${ecfg.sockets.node}|ws://ether.immae.eu/$1 [P,NE,QSA,L]

        <IfModule mod_proxy.c>
          ProxyVia On
          ProxyRequests Off
          ProxyPreserveHost On
          ProxyPass         / unix://${ecfg.sockets.node}|http://ether.immae.eu/
          ProxyPassReverse  / unix://${ecfg.sockets.node}|http://ether.immae.eu/
          <Proxy *>
            Options FollowSymLinks MultiViews
            AllowOverride None
            Require all granted
          </Proxy>
        </IfModule>
      '' ];
    };
  };
}