{ config, lib, pkgs, ... }:
let
  inherit ((import ../common.nix).colorschemes) solarized;

  setOptionForeachPattern = option: value: patterns:
    let
      formatValue = value:
        if lib.isBool value
        then (if value then "True" else "False")
        else
          (if lib.isString value
          then "r\"${value}\""
          else (toString value));
    in
    lib.concatMapStringsSep
      "\n"
      (pattern: "config.set(\"${option}\", ${formatValue value}, \"${pattern}\")")
      patterns;

  permissionVideo = [
    "https://chat.sbruder.de"
    "https://meet.jalr.de"
  ];
  permissionAudio = [
    "https://app.sipgate.com"
  ] ++ permissionVideo; # capturing video almost always also requires capturing audio
  permissionNotifications = [
    "https://app.sipgate.com"
    "https://chat.sbruder.de"
  ];

  cookieExceptions = [
  ];
in
{
  programs.qutebrowser = {
    enable = true;
    aliases = {
      q = "tab-close"; # one tab
      qa = "close"; # one window
      "qa!" = "quit"; # everything
    };
    keyBindings = {
      normal = {
        ",rm" = "spawn -u readability";

        # reasonable tab cycling
        J = "tab-prev";
        K = "tab-next";
        gJ = "tab-move -";
        gK = "tab-move +";

        # mpv
        ",mv" = "spawn mpv --profile=clear-speed {url}";
        ",ma" = "spawn mpv --player-operation-mode=pseudo-gui --ytdl-format=251/bestaudio/best {url}";
        ",mq" = "spawn umpv {url}";
        ",Mv" = "hint links spawn mpv --profile=clear-speed {hint-url}";
        ",Ma" = "hint links spawn mpv --player-operation-mode=pseudo-gui --ytdl-format=251/bestaudio/best {hint-url}";
        ",Mq" = "hint links spawn umpv {hint-url}";
      };
    };
    searchEngines = {
      DEFAULT = "https://bangs.sbruder.de/eval?engine=https://duckduckgo.com/?q=%25s&query={}";
    };
    settings = {
      colors =
        let
          fgbg = fg: bg: { inherit fg bg; };
          topbottom = colour: { top = colour; bottom = colour; };
        in
        with solarized; {
          completion = rec {
            fg = base1;
            odd.bg = base02;
            even.bg = base03;
            match.fg = green;
            scrollbar = fgbg base1 base03;
            category = {
              inherit (fgbg yellow base03) fg bg;
              border = topbottom base03;
            };
            item.selected = {
              inherit (fgbg base1 base01) fg bg;
              border = topbottom base01;
              inherit match;
            };
          };
          contextmenu = {
            disabled = fgbg base0 base02;
            menu = fgbg base1 base03;
            selected = fgbg base1 base01;
          };
          downloads = {
            bar.bg = base03;
            start = fgbg base03 blue;
            stop = fgbg base03 cyan;
            error.fg = red;
          };
          hints = {
            inherit (fgbg base03 yellow) fg bg;
            match.fg = base1;
          };
          keyhint = {
            inherit (fgbg base1 base03) fg bg;
            suffix.fg = base1;
          };
          messages = {
            error = {
              inherit (fgbg base03 red) fg bg;
              border = red;
            };
            warning = {
              inherit (fgbg base03 violet) fg bg;
              border = violet;
            };
            info = {
              inherit (fgbg base1 base03) fg bg;
              border = base03;
            };
          };
          prompts = {
            inherit (fgbg base1 base03) fg bg;
            border = base03;
            selected = fgbg base1 base01;
          };
          statusbar = {
            normal = fgbg green base03;
            insert = fgbg base03 blue;
            passthrough = fgbg base03 cyan;
            private = fgbg base03 base02;
            command = {
              inherit (fgbg base1 base03) fg bg;
              private = fgbg base1 base03;
            };
            caret = {
              inherit (fgbg base03 violet) fg bg;
              selection = fgbg base03 blue;
            };
            progress.bg = blue;
            url.fg = base1;
            url.error.fg = red;
            url.hover.fg = base1;
            url.success.http.fg = cyan;
            url.success.https.fg = green;
            url.warn.fg = violet;
          };

          tabs = rec {
            bar.bg = base03;
            even = fgbg base1 base03;
            odd = even;
            indicator = {
              start = blue;
              stop = cyan;
              error = red;
            };
            selected = rec {
              even = fgbg base02 green;
              odd = even;
            };
            pinned = {
              inherit even odd selected;
            };
          };
        };

      # UI
      scrolling.smooth = true;
      completion.web_history.max_items = 0; # no history

      # Fonts
      fonts = {
        web = {
          family = rec {
            serif = "Georgia";
            sans_serif = "PT Sans";
            standard = sans_serif;
          };
        };
      };

      # Behaviour
      auto_save.session = true;
      session.lazy_restore = true;
      content.autoplay = false;
      downloads = {
        location.directory = "/tmp";
        open_dispatcher = "${pkgs.xdg-utils}/bin/xdg-open"; # QDesktopServices.openUrl always opens Firefox
      };
      editor.command = [ "foot" "-e" "nvim" "-f" "{file}" "-c" "normal {line}G{column0}l" ];
      spellcheck.languages = [ "de-DE" "en-GB" ];
      url.default_page = "about:blank";
      url.start_pages = [ "about:blank" ];

      # Privacy
      content.cookies.accept = "no-3rdparty";
      content.headers.user_agent = "Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0";
      content.headers.accept_language = "en-US,en;q=0.5";

      # Filtering (many don’t get used yet due to lack of cosmetic filtering)
      # https://github.com/gorhill/uBlock/blob/master/assets/assets.json
      # EasyList is using a mirror because upstream’s servers are slow
      content.blocking.adblock.lists = [
        "https://secure.fanboy.co.nz/easylist.txt"
        "https://secure.fanboy.co.nz/easyprivacy.txt"
        "https://secure.fanboy.co.nz/fanboy-social.txt"
        "https://easylist-downloads.adblockplus.org/easylistgermany.txt"
        "https://filters.adtidy.org/extension/ublock/filters/17.txt"
        "https://filters.adtidy.org/extension/ublock/filters/3.txt"
        "https://filters.adtidy.org/extension/ublock/filters/4.txt"
        "https://raw.githubusercontent.com/uBlockOrigin/uAssets/master/filters/annoyances.txt"
        "https://raw.githubusercontent.com/uBlockOrigin/uAssets/master/filters/badlists.txt"
        "https://raw.githubusercontent.com/uBlockOrigin/uAssets/master/filters/badware.txt"
        "https://raw.githubusercontent.com/uBlockOrigin/uAssets/master/filters/filters.txt"
        "https://raw.githubusercontent.com/uBlockOrigin/uAssets/master/filters/privacy.txt"
        "https://raw.githubusercontent.com/uBlockOrigin/uAssets/master/filters/resource-abuse.txt"
        "https://raw.githubusercontent.com/uBlockOrigin/uAssets/master/filters/unbreak.txt"
        "https://secure.fanboy.co.nz/fanboy-annoyance.txt"
        "https://secure.fanboy.co.nz/fanboy-antifacebook.txt"
        "https://secure.fanboy.co.nz/fanboy-cookiemonster.txt"
      ];
    };
    extraConfig = /* python */ ''
      import glob

      c.content.user_stylesheets = glob.glob("${config.xdg.configHome}/qutebrowser/userstyles/*.css")

      c.qt.environ = {
          # otherwise results in severe banding (https://github.com/qutebrowser/qutebrowser/issues/5528)
          "QT_WAYLAND_DISABLE_WINDOWDECORATION": "0",
      }

      c.content.headers.custom = {
          "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
      }

      c.tabs.padding["top"] = 3
      c.tabs.padding["bottom"] = 3

      # Permissions
      ${setOptionForeachPattern "content.media.audio_capture" true permissionAudio}
      ${setOptionForeachPattern "content.media.audio_video_capture" true permissionVideo}
      ${setOptionForeachPattern "content.media.video_capture" true permissionVideo}
      ${setOptionForeachPattern "content.notifications.enabled" true permissionNotifications}

      # Cookie exceptions
      ${setOptionForeachPattern "content.cookies.accept" "all" cookieExceptions}
    '';
  };

  xdg.configFile =
    let
      replaceExtension = newExtension: filename: "${lib.concatStringsSep "." (lib.init (lib.splitString "." filename))}.${newExtension}";

      regularFilesIn = dir: lib.filterAttrs
        (_: v: v == "regular")
        (builtins.readDir (./. + "/${dir}"));

      compileScss = name: file: pkgs.runCommand (replaceExtension "css" name) { } ''
        ${pkgs.sassc}/bin/sassc ${file} $out
      '';
    in
    {
      "qutebrowser/bookmarks/urls".source = config.lib.file.mkOutOfStoreSymlink "${config.xdg.dataHome}/qutebrowser/synced-bookmarks/bookmarks";
      "qutebrowser/quickmarks".source = config.lib.file.mkOutOfStoreSymlink "${config.xdg.dataHome}/qutebrowser/synced-bookmarks/quickmarks";
    } // (lib.mapAttrs'
      (k: _: lib.nameValuePair "qutebrowser/greasemonkey/${k}" { source = ./userscripts + "/${k}"; })
      (regularFilesIn "userscripts")) // (lib.mapAttrs'
      (k: _: lib.nameValuePair "qutebrowser/userstyles/${replaceExtension "css" k}" { source = compileScss k (./userstyles + "/${k}"); })
      (regularFilesIn "userstyles"));

  xdg.dataFile = lib.mapAttrs'
    (dict: sha256: lib.nameValuePair
      "qutebrowser/qtwebengine_dictionaries/${dict}.bdic"
      {
        source = (pkgs.fetchurl {
          url = "https://chromium.googlesource.com/chromium/deps/hunspell_dictionaries/+/18e09b9197a3b1d771c077c530d1a4ebad04c167/${dict}.bdic?format=TEXT";
          inherit sha256;
          postFetch = ''
            base64 -d "$out" > "$TMPDIR/decoded"
            mv "$TMPDIR/decoded" "$out"
          '';
        });
      })
    {
      "de-DE-3-0" = "sha256-B2pHBwDb0Kpiu4s9JMNOE0C9/oPLvPwDXOly8jwUBAA=";
      "en-GB-9-0" = "sha256-c8eaQQ+AkgwpsFX3upB9k0A7BajBfQDo5wVO22L3Maw=";
    };

  home.packages = [
    (pkgs.writeShellScriptBin "qbmarks" /* bash */ ''
      set -euo pipefail

      git() {
          echo "[$] git $@"
          command git -C "${config.xdg.dataHome}/qutebrowser/synced-bookmarks" "$@"
      }

      git commit --no-gpg-sign -a -m "Sync on $(hostname)" || true
      git pull --rebase --no-gpg-sign
      git push
    '')
  ];
}