import fs from "node:fs/promises";
import { resolve } from "node:path";
import debug from "debug";
import { stringify } from "csv-stringify/sync";
import { authViaServiceAccount } from "./io/googleAuth";
import { fetchEmailsFromGmail } from "./io/downloadEmailsGoogle";
import { gmail_v1 } from "googleapis";

type Email = {
  id: string;
  recipient: string;
  emailId: string;
  subject: string;
  sender: string;
  to: string;
  timestamp: string;
};

type Options = {
  out?: string;
  a?: string;
};

export async function commandGoogle(
  keyFile: string,
  userKey: string,
  options: Options,
) {
  debug.enable("triage");
  const auth = await authViaServiceAccount(
    ["https://www.googleapis.com/auth/gmail.metadata"],
    userKey,
    keyFile,
  );
  const gmail = new gmail_v1.Gmail({ auth });

  const output: Array<Email> = [];

  for await (const email of fetchEmailsFromGmail(gmail)) {
    output.push({
      id: email.id,
      recipient: email.to.join(","),
      emailId: email.id,
      subject: email.subject,
      sender: email.from,
      to: email.to.join(","),
      timestamp: email.date,
    });
  }

  if (options.out) {
    const out = resolve(options.out);
    if (options.a) await fs.appendFile(out, stringify(output));
    else await fs.writeFile(out, stringify(output, { header: true }));
  } else console.log(output);
}