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{ pkgs, lib }:

with lib;
let
  importProfiles = dir:
    mapAttrs'
      (name: type:
        let
          name' = builtins.replaceStrings [".nix"] [""] name;
        in if type == "regular" then
          nameValuePair name' (import (dir + ("/" + name)))
        else if type == "directory" then
          nameValuePair name' (pkgs.callPackage (dir + ("/" + name)) {})
        else
          builtins.throw "Unexpected file type: ${type}")
      (builtins.readDir dir);

  self = rec {
    mozlz4 = pkgs.callPackage ./mozlz4.nix {};
    directory = pkgs.callPackage ./directory.nix {};

    profileList = attrValues (directory.pathDirectory ../profiles);

    flattenAttrs = set:
      let recurse = k: v:
        if isAttrs v
        then mapAttrsToList (k': recurse "${k}.${k'}") v
        else nameValuePair k v;
      in listToAttrs (flatten (mapAttrsToList recurse set));

    mkValueString = v:
      if isInt v then toString v
      else if isString v then "\"${v}\""
      else if true == v then "true"
      else if false == v then "false"
      else abort "unsupported value type: ${builtins.typeOf v}";

    mkPrefs = settings: pkgs.writeText "prefs.js"
      ("// dummy line\n" +
      (lib.concatStringsSep "\n"
        (lib.mapAttrsToList (k: v: "pref(\"${k}\", ${mkValueString v}, locked);")
          (flattenAttrs settings))));

    toSearchConfig = settings: pkgs.runCommand "search.json.mozlz4" {} ''
      ${mozlz4.compress} < ${pkgs.writeText "search.json" (builtins.toJSON settings)} > $out
    '';

    profile = { preferences, search }: pkgs.runCommand "profile" {} ''
      mkdir $out
      ln -s ${toUserPrefs preferences} $out/user.js
      # ln -s ${toSearchConfig search} $out/search.json.mozlz4
      cp ${../search-with-qj.json.mozlz4} $out/search.json.mozlz4
    '';

    mkPolicies = policies: pkgs.writeText "policies.json" (builtins.toJSON {
      inherit policies;
    });

    optionsModule = import ./options.nix;
    eval = root: evalModules {
      modules = profileList ++ [
        optionsModule
        root
      ];

      specialArgs = {
        ff = self;
      };
    };

    docs = options:
      let
        optionsDoc = pkgs.nixosOptionsDoc { inherit options; };
      in pkgs.runCommand "manual.html" { nativeBuildInputs = [ pkgs.asciidoctor ]; } ''
        asciidoctor \
          -o $out \
          ${builtins.toFile "manual.asciidoc" optionsDoc.optionsAsciiDoc}
      '';

    patchOmniJa = src: script: pkgs.runCommand "omni.ja" { } ''
      ${pkgs.unzip}/bin/unzip -q ${src}

      ${script}

      ${pkgs.zip}/bin/zip -qr9XD $out .
    '';

    bundle = { policies ? {}, preferences ? {}, patchOmniJaCommand ? "" }:
      let
        firefox = pkgs.firefox-unwrapped;
        policies' = mkPolicies policies;
        preferences' = mkPrefs preferences;
        patchedOmniJa = patchOmniJa "${firefox}/lib/firefox/browser/omni.ja" patchOmniJaCommand;
        patched = pkgs.runCommand "firefox-bundle" {
            nativeBuildInputs = [ pkgs.nix ];
            disallowedReferences = [ firefox ];
          } ''
          cp -r ${firefox} $out
          chmod -R +w $out
          # correct argv[0], which is used to locate distribution and defaults
          substituteInPlace $out/bin/firefox \
            --replace ${firefox} $out

          mkdir $out/lib/firefox/distribution
          cp ${policies'} $out/lib/firefox/distribution/policies.json
          cp ${preferences'} $out/lib/firefox/defaults/pref/99-custom.js
          cp ${patchedOmniJa} $out/lib/firefox/browser/omni.ja
        '';
        wrapped = (pkgs.wrapFirefox patched {
          browserName = "firefox";
          version = "custom";
        }) // { inherit policies preferences; };
      in wrapped;

    # This attempts to provide a start for deploying Nix-configured profiles to
    # systems which do not have Nix installed, and where /nix/store is undesired.
    # It does this by bundling all referenced store items into $out, and rewriting
    # references to those store items.
    export = { selfPath, policies ? {}, preferences ? {} }: pkgs.stdenv.mkDerivation rec {
      name = "firefox-profile-export";
      nativeBuildInputs = [ pkgs.jq ];

      allowedRequisites = [];

      buildCommand =
        let
          policyFile = mkPolicies policies;
          prefsFile = mkPrefs preferences;

          closure = pkgs.closureInfo {
            rootPaths = [
              policyFile prefsFile
            ];
          };
        in ''
        mkdir $out $out/store

        storePaths=$(cat ${closure}/store-paths)
        for p in $storePaths; do
          cp -a "$p" $out/store/"$(basename "$p" | sed -e 's|\([a-z0-9]\{32\}\)-||')"
        done

        mv $out/store/prefs.js $out/
        jq < $out/store/policies.json > $out/policies.json

        find $out -type f -print0 |
          xargs -0I{} -- sed -i -e "s|$NIX_STORE/\\([a-z0-9]\{32\}\\)-|${selfPath}/store/|g" "{}"
      '';
    };

    launcher = firefox: pkgs.writeShellScriptBin "firefox" ''
      # FF doesn't accept ro profiles, tries to create lockfile
      TMP_PROFILE="$(mktemp -d)"
      echo "$TMP_PROFILE"

      function finish() {
        echo deleting profile
        # rm -rv "$TMP_PROFILE"
      }
      trap finish EXIT
      # cp -r ''${profile} "$TMP_PROFILE"
      chmod u+rwx -R "$TMP_PROFILE"

      export MOZ_LOG=nsHttp:1
      export MOZ_LOG_FILE=ff
      # Make FF pay attention to services.settings.server
      # https://bugzilla.mozilla.org/show_bug.cgi?id=1598562
      export XPCSHELL_TEST_PROFILE_DIR=1

      ${firefox}/bin/firefox \
        --no-remote \
        --profile "$TMP_PROFILE" \
        "$@"
    '';
  };
in self