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

export default (event: RawEvent): NormalizedEvent<"mixpanel"> => {
  assert(event, `Mixpanel:event null event: ${event}`);
  assert(
    event.properties.distinct_id,
    `Mixpanel:event event is missing the required field properties.distinct_id ${event}`
  );
  assert(
    event.properties.time,
    `Mixpanel:event event is missing the required field properties.time ${event}`
  );

  // generate IDs the same way stitch does, except we don't have the message hash
  // meaning this event *might* drop events that actually happen
  // within the same second and have the same name and user and we kinda can't do anything about it
  const id = `mixpanel|${event.event}:${event.properties.time}:${event.properties.distinct_id}}`;

  return {
    id,
    ts:
      typeof event.properties.time === "number"
        ? event.properties.time
        : Date.parse(event.properties.time),
    user_info: {
      source_user_id: event.properties.distinct_id,
      user_id: 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: event.properties["$city"] || null,
      country: event.properties["$region"] || null,
      postal_code: null,
      region: null,
      address_line1: null,
      continent_code: null,
      address_line2: null,
      country_code: event.properties.mp_country_code || null,
      timezone: null,
      user_agent: null,
      is_employee: null,
      custom_attributes: null
    },
    text:
      event.event === "Loaded a Page"
        ? `Viewed ${event.properties.url || event.properties.title || "a page"}`
        : event.event,
    href: event.event === "Loaded a Page" ? event.properties.url : null,
    is_bad: false,
    direction: "inbound",
    source: "mixpanel",
    stream: "raw_data"
  };
};