import { createLogger, format, transports as winstonTransports } from 'winston'
import Transport from 'winston-transport'

import { DataDogTransportOptions, Logger } from './types'
import { RollbarTransport } from './rollbar'
import { DataDogTransport } from './datadog'
import { isNextJSLog } from './utils/nextjs-log-helpers'

const defaultFormat = format.combine(format.timestamp(), format.prettyPrint(), format.simple())

const transports: Transport[] = [
  // Ignores all NextJS logs and outputs logs generated by us in a JSON format
  new winstonTransports.Console({
    format: format((info) => (isNextJSLog(info) ? false : info))(),
  }),
]

if (process.env.POST_SERVER_ITEM_ACCESS_TOKEN) {
  transports.push(
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    new RollbarTransport({
      level: 'error',
      format: format((info) => (isNextJSLog(info) ? false : info))(),
    }),
  )
}

if (process.env.EXTERNAL_LOGGER === 'datadog') {
  const apiKey = process.env.DATADOG_API_KEY
  const intakeUrl = process.env.DATADOG_INTAKE_URL

  if (!apiKey || !apiKey.length) {
    console.error('DATADOG_API_KEY must be set if EXTERNAL_LOGGER=datadog')
  } else if (!intakeUrl || !intakeUrl.length) {
    console.error('DATADOG_INTAKE_URL must be set if EXTERNAL_LOGGER=datadog')
  } else {
    const options: DataDogTransportOptions = {
      apiKey,
      intakeUrl,
      hostname: process.env.DATADOG_HOSTNAME,
      service: process.env.DATADOG_SERVICE,
      level: process.env.DATADOG_LOG_LEVEL || undefined,
      ddtags: process.env.DATADOG_TAGS || undefined,
      format: defaultFormat,
      siteState: process.env.SITE_STATE || undefined,
      storefrontVersion: process.env.STOREFRONT_VERSION || undefined,
    }
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    transports.push(new DataDogTransport(options))
  }
}

const defaultLogger = createLogger({
  level: process.env.LOG_LEVEL || 'info',
  defaultMeta: {
    circleJob: process.env.CIRCLE_JOB,
    siteId: process.env.SITE_ID,
    releaseVersion: process.env.RELEASE_VERSION,
  },
  format: defaultFormat,
  transports,
})

const loggers: Record<string, () => Logger> = {
  production: () => defaultLogger,
  development: () => defaultLogger,
  test: () =>
    createLogger({
      silent: true,
    }),
}

const logger = loggers[process.env.NODE_ENV || 'development']()

export { logger }