import assert from "assert";
import { RawEvent, NormalizedEvent } from "../../types";

export default (event: RawEvent): NormalizedEvent<"segment"> => {
  assert(event, `Segment:group null event: ${event}`);
  assert(
    event.messageId,
    `Segment:group event is missing the required field messageId ${event}`
  );
  assert(
    event.timestamp,
    `Segment:group event is missing the required field timestamp ${event}`
  );

  const traits = event.traits || {};
  // https://segment.com/docs/spec/group/
  return {
    id: `segment|${event.messageId}`,
    ts: Date.parse(event.timestamp),
    user_info: {
      source_user_id: null,
      user_id: event.userId || null,
      name: null,
      email: null,
      title: null,
      birthday: null,
      company: {
        name: null,
        id: null,
        industry: null,
        employee_count: null,
        plan: null
      },
      created_at: null,
      age: null,
      gender: null,
      website: null,
      ip: null,
      avatar: null,
      nickname: null,
      phone: null,
      city: null,
      country: null,
      postal_code: null,
      region: null,
      address_line1: null,
      continent_code: null,
      address_line2: null,
      country_code: null,
      timezone: null,
      user_agent: null,
      is_employee: null,
      custom_attributes: Object.keys(traits).length
        ? JSON.stringify({
            "segment|group": {
              _ts: Date.parse(event.timestamp),
              ...traits,
              _group_id: event.groupId
            }
          })
        : null
    },
    text: `Added to group ${traits.name || event.groupId}`,
    href: null,
    is_bad: false,
    direction: null,
    source: "segment",
    stream: "group"
  };
};