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

const getText = (event: RawEvent) =>
  ({
    processed: `Email Processed and Will be Sent`,
    deferred: `Email Deferred`,
    delivered: `Email Delivered`,
    open: `Email Opened`,
    click: `Email Clicked`,
    bounce: `Email Bounced`,
    dropped: `Email Dropped`,
    spamreport: `Email was reported as Spam`,
    unsubscribe: `User Unsubscribed from Emails`,
    group_unsubscribe: `User Unsubscribed from Emails in Group`,
    group_resubscribe: `User Resubscribed to Emails in Group`
  }[event.event] ||
  event.event ||
  null);

const getDirection = (event: RawEvent) =>
  ({
    processed: "outbound",
    delivered: "outbound",
    click: "inbound",
    spamreport: "inbound",
    unsubscribe: "inbound",
    group_unsubscribe: "inbound",
    group_resubscribe: "inbound"
  }[event.event] || null);

export default (event: RawEvent): NormalizedEvent<"sendgrid"> => {
  assert(event, `Sendgrid:Events null event: ${event}`);
  assert(
    event.sg_event_id,
    `Sendgrid:Events event is missing the required field sg_event_id ${event}`
  );
  assert(
    event.timestamp,
    `Sendgrid:Events event is missing the required field timestamp ${event}`
  );

  // https://sendgrid.com/docs/for-developers/tracking-events/event/#json-objects
  return {
    id: `sendgrid|${event.sg_event_id}`,
    ts: event.timestamp * 1000,
    user_info: {
      source_user_id: null,
      user_id: null,
      name: null,
      email: event.email || null,
      ip: event.ip || null,
      avatar: null,
      nickname: null,
      phone: null,
      city: null,
      continent_code: null,
      country: null,
      postal_code: null,
      region: null,
      timezone: null,
      country_code: null,
      address_line1: null,
      address_line2: null,
      user_agent: event.useragent || null,
      is_employee: null,
      title: null,
      birthday: null,
      company: {
        name: null,
        id: null,
        industry: null,
        employee_count: null,
        plan: null
      },
      created_at: null,
      age: null,
      gender: null,
      website: null,
      custom_attributes: null
    },
    text: getText(event),
    href: `https://app.sendgrid.com/email_activity/${event.sg_message_id}`,
    is_bad: [
      "dropped",
      "deferred",
      "bounce",
      "spam report",
      "unsubscribe",
      "group unsubscribe"
    ].includes(event.event),
    direction: getDirection(event),
    source: "sendgrid",
    stream: "events"
  };
};