# Extends ./team-list.nix with synced GitHub information from ./github-teams.json
{ lib }:
let
  githubTeams = lib.importJSON ./github-teams.json;
  teams = import ./team-list.nix { inherit lib; };

  # A fast maintainer id lookup table
  maintainersById = lib.pipe lib.maintainers [
    lib.attrValues
    (lib.groupBy (attrs: toString attrs.githubId))
    (lib.mapAttrs (_: lib.head))
  ];

  maintainerSetToList =
    githubTeam:
    lib.mapAttrsToList (
      login: id:
      maintainersById.${toString id}
      or (throw "lib.teams: No maintainer entry for GitHub user @${login} who's part of the @NixOS/${githubTeam} team")
    );

in
# TODO: Consider automatically exposing all GitHub teams under `lib.teams`,
# so that no manual PRs are necessary to add such teams anymore
lib.mapAttrs (
  name: attrs:
  if attrs ? github then
    let
      githubTeam =
        githubTeams.${attrs.github}
          or (throw "lib.teams.${name}: Corresponding GitHub team ${attrs.github} not known yet, make sure to create it and wait for the regular team sync");
    in
    # TODO: Consider specifying `githubId` in team-list.nix and inferring `github` from it (or even dropping it)
    # This would make renames easier because no additional place needs to keep track of them.
    # Though in a future where all Nixpkgs GitHub teams are automatically exposed under `lib.teams`,
    # this would also not be an issue anymore.
    assert lib.assertMsg (!attrs ? githubId)
      "lib.teams.${name}: Both `githubId` and `github` is set, but the former is synced from the latter";
    assert lib.assertMsg (!attrs ? shortName)
      "lib.teams.${name}: Both `shortName` and `github` is set, but the former is synced from the latter";
    assert lib.assertMsg (
      !attrs ? scope
    ) "lib.teams.${name}: Both `scope` and `github` is set, but the former is synced from the latter";
    assert lib.assertMsg (
      !attrs ? members
    ) "lib.teams.${name}: Both `members` and `github` is set, but the former is synced from the latter";
    attrs
    // {
      githubId = githubTeam.id;
      shortName = githubTeam.name;
      scope = githubTeam.description;
      members =
        maintainerSetToList attrs.github githubTeam.maintainers
        ++ maintainerSetToList attrs.github githubTeam.members;
      githubMaintainers = maintainerSetToList attrs.github githubTeam.maintainers;
    }
  else
    attrs
) teams