{ privateFiles }:
{ config, pkgs, lib, ... }:
let
  serverSpecificConfig = config.myEnv.serverSpecific.quatresaisons;
  yarnModules = pkgs.yarn2nix-moretea.mkYarnModules rec {
    name = "landing";
    pname = name;
    version = "v1.0.0";
    packageJSON = "${pkgs.sources.webapps-landing}/package.json";
    yarnLock = "${pkgs.sources.webapps-landing}/yarn.lock";
    yarnNix = ../websites/tools/tools/landing/yarn-packages.nix;
  };
  toLanding = landingConfig: pkgs.stdenv.mkDerivation rec {
    pname = "landing";
    version = "v1.0.0";
    src = pkgs.sources.webapps-landing;

    buildInputs = [ yarnModules pkgs.yarn2nix-moretea.yarn ];
    configurePhase = ''
      ln -s ${yarnModules}/node_modules .
    '';
    buildPhase = ''
      yarn build
    '';
    installPhase = ''
      cp -a dist $out
      cp -f ${landingConfig} $out/config.yml
      ln -s service-worker.js $out/worker.js
    '';
  };
  normalUsers = serverSpecificConfig.users;
  sponsoredUser = pkgs.writeScriptBin "sponsored_user" ''
    #!/usr/bin/env bash

    set -euo pipefail
    [ -z "''${SUDO_USER+x}" ] && echo "Must be run with sudo" && exit 1

    mygroup=$(id -ng $SUDO_USER)

    sponsored=$(getent group $mygroup | cut -d':' -f4)

    echo "Sponsored users: ''${sponsored:-<none>}"

    log () {
      touch /var/log/sponsored_users
      chmod go-rwx /var/log/sponsored_users
      echo "`date` $mygroup $1" | LANG=C cat -v | tr '\012' ' ' | sed 's:$:\x0a:' >> /var/log/sponsored_users
    }

    create_user () {
      log "creates $1: $2"
      useradd -m -G users,$mygroup -g $mygroup -p '!' "$1"
      touch /var/lib/nixos/sponsored_users
      chmod go-rwx /var/lib/nixos/sponsored_users
      echo "$mygroup $1 $2" >> /var/lib/nixos/sponsored_users
      (${pkgs.openldap}/bin/ldapadd -c -D cn=root,dc=salle-s,dc=org \
        -y /var/secrets/ldap/sync_password 2>/dev/null >/dev/null || true) <<EOF
    dn: uid=$1,uid=$mygroup,ou=users,dc=salle-s,dc=org
    objectClass: inetOrgPerson
    cn: $1
    description:: $(echo -n "$2" | base64)
    sn: $1
    uid: $1
    EOF
      while ! passwd "$1"; do
        echo "please give an initial password"
      done
    }

    delete_user () {
      IFS=",";
      for u in $sponsored; do
      if [ "$u" = "$1" ]; then
        log "deletes $1"
        userdel -r "$1"
        sed -i -e "/^$mygroup $1/d" /var/lib/nixos/sponsored_users
        ${pkgs.openldap}/bin/ldapdelete -D cn=root,dc=salle-s,dc=org \
          -y /var/secrets/ldap/sync_password \
          "uid=$1,uid=$mygroup,ou=users,dc=salle-s,dc=org"
        echo "deleted"
        exit 0
      fi
      done

      echo "User does not exist or does not belong to you";
      exit 1
    }

    reset_password () {
      IFS=",";
      for u in $sponsored; do
      if [ "$u" = "$1" ]; then
        log "resets password for $1"
        passwd "$1"
        exit 0
      fi
      done

      echo "User does not exist or does not belong to you";
      exit 1
    }

    reset_ldap_password () {
      if [ "$1" = "$mygroup" ]; then
        log "resets web password"
        ${pkgs.openldap}/bin/ldappasswd -D cn=root,dc=salle-s,dc=org \
          -y /var/secrets/ldap/sync_password \
          -S "uid=$mygroup,ou=users,dc=salle-s,dc=org"
      else
        IFS=",";
        for u in $sponsored; do
        if [ "$u" = "$1" ]; then
          log "resets web password of $1"
          ${pkgs.openldap}/bin/ldappasswd -D cn=root,dc=salle-s,dc=org \
            -y /var/secrets/ldap/sync_password \
            -S "uid=$1,uid=$mygroup,ou=users,dc=salle-s,dc=org"
          exit 0
        fi
        done

        echo "User does not exist or does not belong to you";
        exit 1
      fi
    }

    show_help () {
      echo "sponsored_users create username realname"
      echo "    create a new sub-user attached to your account"
      echo "sponsored_users (delete|reset_password) username"
      echo "    delete a sub-user attached to your account or reset his password"
      echo "sponsored_users reset_ldap_password username"
      echo "    reset the web password of a sub-user or yourself"
    }

    [ -z "''${1+x}" -o -z "''${2+x}" ] && { show_help ; exit 0; }
    action="$1"
    username="$2"
    shift
    shift

    case "$action" in
      create)
        [ -z "''${1+x}" ] && { show_help ; echo "Conformément à la charte https://4c.salle-s.org/charte veuillez préciser le nom réel du futur utilisateur du compte $username, juste pour root." ; exit 1; }
        create_user "$username" "$*";
        ;;
      delete)
        delete_user "$username";
        ;;
      reset_password)
        reset_password "$username";
        ;;
      reset_ldap_password)
        reset_ldap_password "$username";
        ;;
      *)
        show_help
        ;;
    esac
  '';
in
{
  deployment = {
    targetUser = "root";
    targetHost = config.hostEnv.ips.main.ip4;
    substituteOnDestination = true;
  };

  programs.ssh.package = pkgs.openssh.overrideAttrs(old: {
    PATH_PASSWD_PROG = "/run/wrappers/bin/passwd";
    buildFlags = [ "SSH_KEYSIGN=/run/wrappers/bin/ssh-keysign" ];
  });

  imports = builtins.attrValues (import ../..) ++
    [ ./quatresaisons/nextcloud.nix ./quatresaisons/databases.nix ];

  myEnv = import "${privateFiles}/environment.nix" // { inherit privateFiles; };

  fileSystems = {
    "/"     = { device = "/dev/disk/by-uuid/865931b4-c5cc-439f-8e42-8072c7a30634"; fsType = "ext4"; };
    "/home" = { device = "/dev/disk/by-uuid/76020bc4-5b88-464c-8952-9a59072c597f"; fsType = "ext4"; neededForBoot = true; };
    "/boot" = { device = "/dev/disk/by-uuid/0fb8421a-61e5-4ed5-a795-4dd3a9b2152a"; fsType = "ext4"; };
    "/var/lib" = { device = "/home/var_lib"; fsType = "none"; options = [ "defaults,bind" ]; };
  };
  powerManagement.cpuFreqGovernor = "powersave";
  hardware.enableRedistributableFirmware = true;

  boot.initrd.availableKernelModules = [ "ahci" "megaraid_sas" "sd_mod" ];
  boot.initrd.kernelModules = [ "dm-snapshot" ];
  boot.kernelModules = [ "kvm-intel" ];

  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  boot.loader.grub.device = "/dev/sda";

  networking.firewall.enable = false;
  networking.firewall.allowedTCPPorts = [ 80 443 ];
  networking.useDHCP = false;
  networking.interfaces.eth0.useDHCP = true;
  networking.interfaces.eth0.ipv6.addresses = [
    { address = pkgs.lib.head config.hostEnv.ips.main.ip6; prefixLength = 64; }
  ];
  networking.defaultGateway6 = { address = "fe80::1"; interface = "eth0"; };
  services.udev.extraRules = ''
    ACTION=="add", SUBSYSTEM=="net", ATTR{address}=="c8:60:00:8b:2f:f0", NAME="eth0"
  '';
  security.pam.services.chage.text = ''
    auth      sufficient pam_rootok.so
    auth      required   pam_unix.so
    account   required   pam_unix.so
    session   required   pam_unix.so
    password  required   pam_permit.so
  '';
  security.pam.services.sshd.makeHomeDir = true;
  security.pam.services.passwd_default = {};
  security.pam.services.passwd.text = ''
    password        required        pam_cracklib.so enforce_for_root difok=2 minlen=8 dcredit=2 ocredit=2 retry=3
  '' + config.security.pam.services.passwd_default.text;

  system.activationScripts.ldapSync = {
    deps = [ "secrets" "users" ];
    text =
      let
        com = "-D cn=root,dc=salle-s,dc=org -y /var/secrets/ldap/sync_password";
      in ''
      # Add users
      ${pkgs.openldap}/bin/ldapadd -c ${com} -f /var/secrets/ldap/ldaptree.ldif 2>/dev/null >/dev/null || true

      # Remove obsolete users
      ${pkgs.openldap}/bin/ldapsearch -LLL ${com} -s one -b "ou=users,dc=salle-s,dc=org" "uid" |\
        grep "^uid" | ${pkgs.gnused}/bin/sed -e "s/uid: //" | while read ldapuser; do

        for user in ${builtins.concatStringsSep " " (builtins.attrNames normalUsers)}; do
          if [ "$user" = "$ldapuser" ]; then
            continue 2
          fi
        done
        ${pkgs.openldap}/bin/ldapdelete -r ${com} uid=$ldapuser,ou=users,dc=salle-s,dc=org
      done

      # Subusers
      if [ -f /var/lib/nixos/sponsored_users ]; then
        cat /var/lib/nixos/sponsored_users | while read mainUser subUser name; do
          (${pkgs.openldap}/bin/ldapadd -c ${com} 2>/dev/null >/dev/null || true) <<EOF
      dn: uid=$subUser,uid=$mainUser,ou=users,dc=salle-s,dc=org
      objectClass: inetOrgPerson
      cn: $subUser
      description:: $(echo -n "$name" | base64)
      sn: $subUser
      uid: $subUser
      EOF
        done
      fi
    '';
  };

  secrets.keys = [
    {
      dest = "ldap/sync_password";
      permissions = "0400";
      text = serverSpecificConfig.ldap_sync_password;
    }
    {
      dest = "ldap/ldaptree.ldif";
      permissions = "0400";
      text = serverSpecificConfig.ldap_service_users
        + (builtins.concatStringsSep "\n" (lib.mapAttrsToList (n: v: ''
        dn: uid=${n},ou=users,dc=salle-s,dc=org
        objectClass: inetOrgPerson
        cn: ${n}
        description: ${v._meta.name or n} ${v._meta.email}
        sn: ${n}
        uid: ${n}
      '') normalUsers));
    }
  ];

  myServices.monitoring.enable = true;
  myServices.certificates.enable = true;
  users.mutableUsers = true;
  system.stateVersion = "21.03";
  programs.zsh.enable = true;

  users.motd = ''
    Bienvenue sur quatresaisons.salle-s.org !

    * Charte :
      https://4c.salle-s.org/charte
    * Gérer les utilisateurs unix additionnels :
      sudo sponsored_user -h
    * Applications web :
      * tableau de bord : https://4c.salle-s.org/
      * nextcloud : https://nextcloud.4c.salle-s.org/
  '';

  users.groups =
    lib.mapAttrs (n: v: { gid = v.uid; }) normalUsers
    // { wwwrun = { gid = config.ids.gids.wwwrun; }; };
  users.users =
    let
      defaultNormal = n: {
        group = n;
        extraGroups = [ "users" ];
        isNormalUser = true;
      };
    in
      lib.mapAttrs (n: v: defaultNormal n // (lib.filterAttrs (k: _: k != "_meta") v)) normalUsers
      // {
        sponsored-separator = {
          uid = 10000;
          group = "users";
          home = "/var/empty";
          extraGroups = [];
          isNormalUser = true;
          createHome = false;
        };
        wwwrun = {
          group = "wwwrun";
          description = "Apache httpd user";
          uid = config.ids.uids.wwwrun;
          extraGroups = [ "keys" ];
        };
      };

  system.activationScripts.usersPost = {
    deps = [ "users" "groups" ];
    text = builtins.concatStringsSep "\n" (lib.mapAttrsToList (n: v: ''
      if getent shadow "${n}" | grep -q '^${n}:${v.initialHashedPassword or "!"}:1'; then
        chage -d 0 "${n}"
        [ '${v.initialHashedPassword or "!"}' = '!' ] && passwd -d "${n}"
      fi
    '') normalUsers);
  };
  security.sudo.extraRules = [
    {
      commands = [
        { command = "${sponsoredUser}/bin/sponsored_user"; options = [ "NOPASSWD" ]; }
      ];
      users = builtins.attrNames normalUsers;
      runAs = "root";
    }
  ];

  environment.systemPackages = [
    sponsoredUser
    pkgs.git pkgs.vim pkgs.rsync pkgs.strace pkgs.home-manager
    pkgs.telnet pkgs.htop pkgs.iftop pkgs.bind.dnsutils pkgs.httpie
    pkgs.iotop pkgs.whois pkgs.ngrep pkgs.tcpdump pkgs.tshark
    pkgs.tcpflow pkgs.nmap pkgs.p0f pkgs.socat pkgs.lsof pkgs.psmisc
    pkgs.openssl pkgs.wget pkgs.pv pkgs.smartmontools pkgs.youtube-dl
    pkgs.unzip pkgs.octave pkgs.feh pkgs.xv pkgs.sshfs pkgs.gdb
    pkgs.file pkgs.lynx pkgs.tmux pkgs.awesome pkgs.libreoffice
    pkgs.evince pkgs.firefox pkgs.xcalib pkgs.python3 pkgs.python2
    pkgs.xorg.xkbcomp pkgs.subversion pkgs.xclip pkgs.imagemagick
    pkgs.bc pkgs.sox pkgs.zip pkgs.gnome3.gnome-screenshot
    pkgs.datadog-process-agent
  ];

  services.websites.env.production = {
    enable = true;
    adminAddr = "httpd@immae.eu";
    httpdName = "Prod";
    modules = [ "http2" "deflate" "filter" ];
    extraConfig = [
      ''
        LogFormat "%{Host}i:%p %h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combinedVhost
        Protocols h2 http/1.1
        AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/javascript
      '' ];
    ips =
      let ips = config.hostEnv.ips.main;
      in [ips.ip4] ++ (ips.ip6 or []);

    fallbackVhost = {
      certName    = "quatresaisons";
      hosts       = [ "quatresaisons.immae.eu" ];
      root        = pkgs.runCommand "empty" {} "mkdir $out && touch $out/index.html";
      extraConfig = [ "DirectoryIndex index.html" ];
    };
    vhostConfs.salle-s = {
      certName = "quatresaisons";
      addToCerts = true;
      hosts = [ "salle-s.org" ];
      root = toLanding ./quatresaisons/landing.yml;
      extraConfig = [
        ''
          <Directory ${toLanding ./quatresaisons/landing.yml}>
            AllowOverride None
            Require all granted
            DirectoryIndex index.html
          </Directory>
      ''
      ];
    };
    vhostConfs.tools = {
      certName = "quatresaisons";
      addToCerts = true;
      hosts = [ "4c.salle-s.org" "quatresaisons.salle-s.org" "quatre-saisons.salle-s.org" ];
      root = toLanding ./quatresaisons/landing_4c.yml;
      extraConfig = [
        ''
          Alias /charte ${serverSpecificConfig.charte_path}
          <Directory ${serverSpecificConfig.charte_path}>
            AllowOverride None
            Require all granted
            DirectoryIndex index.html index.txt
          </Directory>

          <Directory ${toLanding ./quatresaisons/landing_4c.yml}>
            AllowOverride None
            Require all granted
            DirectoryIndex index.html
          </Directory>
      ''
      ];
    };
  };
  system.activationScripts.httpd = '' 
    install -d -m 0750 -o wwwrun -g wwwrun /var/lib/php
    install -d -m 0750 -o wwwrun -g wwwrun /var/lib/php/sessions
  '';

  services.phpfpm = {
    phpOptions = ''
      session.save_path = "/var/lib/php/sessions"
      post_max_size = 20M
      ; 15 days (seconds)
      session.gc_maxlifetime = 1296000
      ; 30 days (minutes)
      session.cache_expire = 43200
      '';
    settings = {
      log_level = "notice";
    };
  };

}