package moe.kageru.spektacles

import arrow.core.Option
import arrow.core.toOption
import java.time.LocalDateTime

class ParsedLine(val time: LocalDateTime,
                 val user: Option<String>,
                 val userMode: UserMode,
                 val message: String,
                 val isSystemMessage: Boolean,
                 private val originalMessage: String
) {
  override fun toString() = originalMessage

  fun getMention(): Option<String> = mentionRegex.find(message).toOption().map { it.value.toLowerCase() }

  companion object {
    // 18 04 26 19:40:47 <kageru_>     Hi
    private val lineRegex = Regex("""(?<year>\d\d)\s(?<month>\d\d)\s(?<day>\d\d)\s(?<hour>\d\d):(?<minute>\d\d):(?<second>\d\d)\s(<(?<mode>[~&@%+])?(?<author>\w+)>\t)?(?<message>.*)""")
    private val mentionRegex = Regex("(?<=@)\\w+")

    fun parse(line: String): ParsedLine? = lineRegex
        .matchEntire(line)
        ?.let {
          ParsedLine(
              LocalDateTime.of(
                  it.groups["year"]!!.value.toInt(),
                  it.groups["month"]!!.value.toInt(),
                  it.groups["day"]!!.value.toInt(),
                  it.groups["hour"]!!.value.toInt(),
                  it.groups["minute"]!!.value.toInt(),
                  it.groups["second"]!!.value.toInt()
              ),
              it.groups["author"]?.value.toOption(),
              it.groups["mode"]?.value?.let { UserMode.values().first { mode -> mode.icon == it } } ?: UserMode.NONE,
              it.groups["message"]!!.value,
              it.groups["author"] == null,
              it.value
          )
        }
  }
}

enum class UserMode(val icon: String) {
  ADMIN("~"),
  BOT("&"),
  OP("@"),
  HOP("%"),
  VOICE("+"),
  NONE("")
}

typealias ParsedLines = Sequence<ParsedLine>

fun Lines.parse(): ParsedLines {
  return map { ParsedLine.parse(it) }
      .filterNotNull()
}