package moe.kageru.kagebot

import java.time.ZoneId
import java.time.format.DateTimeFormatter
import java.util.logging.FileHandler
import java.util.logging.Formatter
import java.util.logging.LogRecord
import java.util.logging.Logger

object Log {
  private val log: Logger by lazy {
    Logger.getGlobal().apply {
      addHandler(
        FileHandler("kagebot.log", true).apply {
          formatter = LogFormatter()
        }
      )
    }
  }

  fun info(message: String) {
    log.info(message)
  }

  fun warn(message: String) {
    log.warning(message)
  }
}

private class LogFormatter : Formatter() {
  private val timeFormatter: DateTimeFormatter =
    DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneId.systemDefault())

  override fun format(record: LogRecord): String {
    return "[${record.level}] ${timeFormatter.format(record.instant)}: ${record.message}\n"
  }
}