{ config, lib, pkgs, fetchurl, ... }:

with lib;

let

  cfg  = config.services.news2kindle;

portString = toString cfg.smtp.port;

  convertScript = pkgs.writeText "convertScript.sh" ''#!/bin/bash
NAME=$1
RECIPEPATH=$2
MOBIPATH=$3
FROMADDR=$4
TOADDR=$5
if [ ! -f mobi/$NAME.mobi ]; then
 ebook-convert $RECIPEPATH/$NAME.recipe $MOBIPATH/$NAME.mobi --output-profile kindle -v
fi

mailsend -smtp ${cfg.smtp.address} -port ${portString} -from $FROMADDR -to $TOADDR -sub "New news from $NAME" -attach $MOBIPATH/$NAME.mobi
sleep 60
'';

reps = mapAttrsToList (name: value:
    let
        mailAddress = if value.mailAddress != null
            then value.mailAddress
            else name;
        cronJobs = mapAttrsToList ( jobExpr: jobValue:
            let
            cronExpression = if jobValue.cronExpression != "0 5 * * *"
                then jobValue.cronExpression
                else jobExpr;
            in
            jobValue // {cronExpression = cronExpression;}) value.cronJobs;
    in
    value // { mailAddress = name; cronJobs = cronJobs; }
) cfg.recipients;

jobs =  concatMap(recipient: concatMap(cronjob:
    let
        scriptName =  builtins.replaceStrings ["*"] ["star"] (builtins.replaceStrings [" "] ["_"] (builtins.replaceStrings ["@"] [""] "${recipient.mailAddress}-${cronjob.cronExpression}.sh"));
        scriptlines = concatMapStrings(recipe:
            if isNull recipe.content then
                "bash ${convertScript} ${recipe.name}  ${calibreWithRecipes}/var/news2kindle/recipes ${cfg.mobiPath} ${recipient.fromMail} ${recipient.mailAddress}\n"
            else
                ''
                 mkdir  -p /tmp/news2kindle/recipes
                 echo "${recipe.content}" > /tmp/news2kindle/recipes/${recipe.name}.recipe
                 bash ${convertScript} ${recipe.name} /tmp/news2kindle/recipes/ ${cfg.mobiPath} ${recipient.fromMail} ${recipient.mailAddress}
                '' ) cronjob.recipes;
        script = pkgs.writeText "${scriptName}" ''#!/bin/bash
              rm -f ${cfg.mobiPath}/*.mobi
              mkdir -p ${cfg.mobiPath}
              ${scriptlines}
              '';
    in
    ["${cronjob.cronExpression} root bash ${script}"]) recipient.cronJobs) reps;


odfpyNoTest = pkgs.python38Packages.odfpy.overrideAttrs (oldAttrs: rec {
    doInstallCheck = false;
});

apswNoTest = pkgs.python38Packages.apsw.overrideAttrs (oldAttrs: rec {
    doInstallCheck = false;
});

calibreWithRecipes = pkgs.calibre.overrideAttrs (oldAttrs: rec {
    installPhase = ''
    mkdir -p $out/var/news2kindle/recipes
    cp -ravf recipes $out/var/news2kindle
    ''+ oldAttrs.installPhase ;

    buildInputs = (remove pkgs.python38Packages.apsw  (remove pkgs.python38Packages.odfpy oldAttrs.buildInputs)) ++ [odfpyNoTest apswNoTest pkgs.python38Packages.feedparser pkgs.python38Packages.pyqt5];

#    patches = oldAttrs.patches ++  [./calibre-disable_plugins.patch];
#    patches = [./calibre-disable_plugins.patch];

});


in

{
  ###### interface

  options = {

    services.news2kindle = {

      enable = mkOption {
        type = types.bool;
        default = false;
        description = ''
          Whether to enable news2kindle service.
        '';
      };

      recipePath = mkOption {
        example = "/var/news2kindle/recipes";
        default = "/var/news2kindle/recipes";
        type = types.str;
        description = ''
          Path where the recipes should be saved
        '';
      };

      mobiPath = mkOption {
        example = "/tmp/news2kindle/mobi";
        default = "/tmp/news2kindle/mobi";
        type = types.str;
        description = ''
          Path where the mobi files should be saved
        '';
      };

      fromMail = mkOption {
        example = "news@stubbe.rocks";
        default = "news@stubbe.rocks";
        type = types.str;
        description = ''
          Adrees of the  sender, please allow this mail in your kindle doc service
        '';
      };


      recipients = mkOption {
          type = types.attrsOf (types.submodule (import ./recipient-options.nix { inherit config lib; }));
      };

      smtp = {

          address = mkOption {
            type = types.str;
            default = "localhost";
            description = "Address of the SMTP server for news2kindle.";
          };

          port = mkOption {
            type = types.int;
            default = 25;
            description = "Port of the SMTP server for news2kindle.";
          };

          username = mkOption {
            type = types.nullOr types.str;
            default = null;
            description = "Username of the SMTP server for news2kindle.";
          };

          password = mkOption {
            type = types.nullOr types.str;
            default = null;
            description = "Password of the SMTP server for news2kindle.";
          };
      };

    };

  };


  ###### implementation

  config =  mkIf cfg.enable{
      environment.systemPackages = [
	#	pkgs.python27Packages.pyqt5
	#	pkgs.python36Packages.pyqt5
		pkgs.mailsend
		calibreWithRecipes
	];
      services.cron.enable = true;
      services.cron.systemCronJobs = jobs;
  };
}