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package com.gu.identity.model.circe

import org.joda.time.{DateTime, DateTimeZone}
import org.joda.time.format.{DateTimeFormat, DateTimeFormatter}

import scala.util.control.NonFatal

private[circe] object DateTimeUtils {

  // Uses same serialisation format as com.gu.identity.modelDateTimeSerializer.
  // This is the serialisation format of date times stored in users table.
  val dateTimeFormatter: DateTimeFormatter =
    DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss'Z'").withZone(DateTimeZone.UTC)

  // It has become apparent that some date times in the users table are stored in milliseconds.
  val dateTimeFormatter2: DateTimeFormatter =
    DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'").withZone(DateTimeZone.UTC)

  // Accounts for the fact that we use 2 different formats to store date times in the users table.
  def parseDateTime(dateTime: String): DateTime = {
    try {
      dateTimeFormatter.parseDateTime(dateTime)
    } catch {
      case NonFatal(_) => dateTimeFormatter2.parseDateTime(dateTime)
    }
  }
}