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

let
  cfg = config.tasks.multimedia-archive;
  mountName = "/mnt/archives";

  deviantArt = name: "https://deviantart.com/${name}";
  artStation = name: "https://www.artstation.com/${name}";
  newgrounds = name: "https://${name}.newgrounds.com";

  pathPrefix = "multimedia-archive";
in
{
  options.tasks.multimedia-archive.enable =
    lib.mkEnableOption "multimedia archiving setup";

  config = lib.mkIf cfg.enable (
    let
      ytdlpArgs = [
        # No overwriting of videos and related files.
        "--no-force-overwrites"

        # Embed metadata in the file.
        "--write-info-json"

        # Embed chapter markers, if possible.
        "--embed-chapters"

        # Write the subtitle file with the preferred languages.
        "--write-subs"
        "--sub-langs"
        "en.*,ja,ko,zh.*,fr,pt.*"

        # Write the description in a separate file.
        "--write-description"

        # The global output for all of the jobs.
        "--output"
        "%(uploader,artist,creator|Unknown)s/%(release_date>%F,upload_date>%F|Unknown)s-%(title)s.%(ext)s"

        # Select only the most optimal format for my usecases.
        "--format"
        "(webm,mkv,mp4)[height<=?1280]"

        # Prefer MKV whenever possible for video formats.
        "--merge-output-format"
        "mkv"

        # Don't download any videos that are originally live streams.
        "--match-filters"
        "!was_live"

        "--audio-quality"
        "1"

        # Not much error since it will always fail.
        "--no-abort-on-error"
        "--ignore-errors"
        "--ignore-no-formats-error"
      ];

      ytdlpArchiveVariant = pkgs.writeScriptBin "yt-dlp-archive-variant" ''
        ${pkgs.yt-dlp}/bin/yt-dlp ${lib.escapeShellArgs ytdlpArgs} $@
      '';

      # Given an attribute set of jobs that contains a list of objects with
      # their names and URL, create an attrset suitable for declaring the
      # archiving jobs of several services for `services.yt-dlp`,
      # `services.gallery-dl`, and `services.archivebox`.
      mkJobs = { extraArgs ? [ ], db }:
        let
          days = [ "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday" "Sunday" ];
          categories = lib.zipListsWith
            (index: category: { inherit index; data = category; })
            (lib.lists.range 1 (lib.length (lib.attrValues db)))
            (lib.mapAttrsToList (name: value: { inherit name; inherit (value) subscriptions extraArgs; }) db);
          jobsList = builtins.map
            (category:
              let
                jobExtraArgs = lib.attrByPath [ "data" "extraArgs" ] [ ] category;
              in
              {
                name = category.data.name;
                value = {
                  extraArgs = extraArgs ++ jobExtraArgs;
                  urls = builtins.map (subscription: subscription.url) category.data.subscriptions;
                  startAt = lib.elemAt days (lib.mod category.index (lib.length days));
                };
              })
            categories;
        in
        lib.listToAttrs jobsList;
    in
    {
      environment.systemPackages = [ ytdlpArchiveVariant ];

      sops.secrets = lib.getSecrets (lib.getSecret "multimedia-archive.yaml")
        (lib.attachSopsPathPrefix pathPrefix {
          "secrets-config" = { };
        });

      profiles.filesystem.setups.archive.enable = true;

      services.yt-dlp = {
        enable = true;
        archivePath = "${mountName}/yt-dlp-service";

        # This is applied on all jobs. It is best to be minimal as much as
        # possible for this.
        extraArgs = ytdlpArgs ++ [
          # Make a global list of successfully downloaded videos as a cache for yt-dlp.
          "--download-archive"
          "${config.services.yt-dlp.archivePath}/videos"
        ];

        jobs = mkJobs {
          extraArgs = [ "--playlist-end" "20" ];
          db = lib.importJSON ./data/jobs.yt-dlp.json;
        };
      };

      services.archivebox = {
        enable = true;
        webserver.enable = true;

        jobs = mkJobs
          {
            db = lib.importJSON ./data/jobs.archivebox.json;
          } // {
          computer = {
            urls = [
              "https://blog.mozilla.org/en/feed/"
              "https://distill.pub/rss.xml"
              "https://drewdevault.com/blog/index.xml"
              "https://fasterthanli.me/index.xml"
              "https://jvns.ca/atom.xml"
              "https://www.bytelab.codes/rss/"
              "https://www.collabora.com/feed"
              "https://www.jntrnr.com/atom.xml"
              "https://yosoygames.com.ar/wp/?feed=rss"
              "https://simblob.blogspot.com/feeds/posts/default"
            ];
            startAt = "weekly";
          };
        };
      };

      services.gallery-dl = {
        enable = true;
        archivePath = "${mountName}/gallery-dl-service";

        extraArgs = [
          # Record all downloaded files in an archive file.
          "--download-archive"
          "${config.services.gallery-dl.archivePath}/photos"

          # Write metadata to separate JSON files.
          "--write-metadata"

          # The config file that contains the secrets for various services.
          # We're putting as a separate config file instead of configuring it
          # in the service properly since secrets decrypted by sops-nix cannot
          # be read in Nix.
          "--config"
          "${config.sops.secrets."${pathPrefix}/secrets-config".path}"
        ];

        settings.extractor = {
          filename = "{date:%F}-{title}.{extension}";
        };

        jobs = {
          arts = {
            urls = [
              (deviantArt "xezeno") # Xezeno
              (deviantArt "jenzee") # JenZee
              #"https://www.pixiv.net/en/users/60562229" # Ravioli
              (artStation "kuvshinov_ilya") # Ilya Kuvshinov
              (artStation "meiipng") # Meiiart
              (artStation "bassem_wageeh") # Bassem wageeh
              (artStation "ocellusart") # Ocellus
              (artStation "jordanparrin") # Jordan Parrin
              (artStation "blazporenta") # Blaz Porenta
              (artStation "an_na") # Anya Mozharovska
              (artStation "dllxtt") # Mykhail Klymenko
              (artStation "nicwilliams") # Nic Williams
              (artStation "aaconcept") # Andrew An
              (artStation "aliena85") # Mandy Jurgens
              (artStation "666kart") # Kan Liu
              (artStation "angryangryasian") # David Liu
              (artStation "mikedilonardo") # Michael Di Lonardo
              (artStation "karlschecht") # Karl Schecht
              (artStation "12oyraj") # Royraj Vichaidit
              (artStation "jcru3d") # Jan Cruz
              (artStation "wookun") # Sangtaek Woo
              (newgrounds "hyperjerk") # HyperJerk
            ];
            startAt = "weekly";
          };
        };
      };
    }
  );
}