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

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

  // created isn't guarenteed
  const ts = event["$properties"]["$created"]
    ? Date.parse(event["$properties"]["$created"])
    : 0;
  return {
    id: event["$distinct_id"],
    ts,
    user_info: {
      // Mixpanel user IDs are really messy, since they default to creating their own IDs
      // unless the user provides an ID, which isn't transparent in raw_data, but is when requesting
      // people. So events store them as source_user_id, but here we store them as both so it actually
      // creates the important user AND lets you match events for the user
      source_user_id: event["$distinct_id"],
      user_id: event["$distinct_id"],
      name:
        event["$properties"]["$name"] ||
        `${event["$properties"]["$first_name"] || ""} ${event["$properties"][
          "$last_name"
        ] || ""}`.trim() ||
        null,
      email: event["$properties"]["$email"] || null,
      title: null,
      birthday: null,
      company: {
        name: null,
        id: null,
        industry: null,
        employee_count: null,
        plan: null
      },
      created_at: event["$properties"]["$created"]
        ? Date.parse(event["$properties"]["$created"])
        : null,
      age: null,
      gender: null,
      website: null,
      ip: null,
      avatar: null,
      nickname: null,
      phone: null,
      city: event["$properties"]["$city"] || null,
      country: null,
      postal_code: null,
      region: event["$properties"]["$region"] || null,
      address_line1: null,
      continent_code: null,
      address_line2: null,
      country_code: event["$properties"]["$country_code"] || null,
      timezone: null,
      user_agent: null,
      is_employee: null,
      custom_attributes: Object.keys(event["$properties"]).length
        ? JSON.stringify({
            "mixpanel|engage": {
              _ts: ts,
              ...Object.assign(
                {},
                ...Object.keys(event["$properties"])
                  .filter(s => !s.startsWith("$"))
                  .map(key => ({
                    [key]: event["$properties"][key]
                  }))
              )
            }
          })
        : null
    },
    text: "Identified User",
    href: `https://mixpanel.com/report/explore/#user?distinct_id=${event["$distinct_id"]}`,
    is_bad: false,
    direction: null,
    source: "mixpanel",
    stream: "engage"
  };
};