// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import * as pino from 'pino';
import { redactAll } from '../util/privacy';
import { missingCaseError } from '../util/missingCaseError';
import { reallyJsonStringify } from '../util/reallyJsonStringify';

// These match [Pino's recommendations][0].
// [0]: https://getpino.io/#/docs/api?id=loggerlevels-object
export enum LogLevel {
  Fatal = 60,
  Error = 50,
  Warn = 40,
  Info = 30,
  Debug = 20,
  Trace = 10,
}

// These match [Pino's core fields][1].
// [1]: https://getpino.io/#/?id=usage
export type LogEntryType = Readonly<{
  level: LogLevel;
  msg: string;
  time: string;
}>;

// The code below is performance sensitive since it runs for > 100k log entries
// whenever we want to send the debug log. We can't use `zod` because it clones
// the data on successful parse and ruins the performance.
export const isLogEntry = (data: unknown): data is LogEntryType => {
  if (data === null || typeof data !== 'object') {
    return false;
  }

  const { level, msg, time } = data as Partial<LogEntryType>;

  if (typeof level !== 'number') {
    return false;
  }

  if (!LogLevel[level]) {
    return false;
  }

  if (typeof msg !== 'string') {
    return false;
  }

  if (typeof time !== 'string') {
    return false;
  }

  return !Number.isNaN(new Date(time).getTime());
};

export function getLogLevelString(value: LogLevel): pino.Level {
  switch (value) {
    case LogLevel.Fatal:
      return 'fatal';
    case LogLevel.Error:
      return 'error';
    case LogLevel.Warn:
      return 'warn';
    case LogLevel.Info:
      return 'info';
    case LogLevel.Debug:
      return 'debug';
    case LogLevel.Trace:
      return 'trace';
    default:
      throw missingCaseError(value);
  }
}

export function cleanArgs(args: ReadonlyArray<unknown>): string {
  return redactAll(
    args
      .map(item =>
        typeof item === 'string' ? item : reallyJsonStringify(item)
      )
      .join(' ')
  );
}