package nl.astraeus.vst.ui.css

import nl.astraeus.css.style.DescriptionProvider
import nl.astraeus.css.style.cls

private val CAPITAL_LETTER = Regex("[A-Z]")

fun String.hyphenize(): String {
  var result = replace(CAPITAL_LETTER) {
    "-${it.value.lowercase()}"
  }

  if (result.startsWith('-')) {
    result = result.substring(1)
  }

  return result
}

private var nextCssId = 1

object CssSettings {
  var preFix = "css"
  var shortId = false
  var minified = false
}

private fun nextShortId(): String {
  var id = nextCssId++
  val result = StringBuilder()

  while (id > 0) {
    val ch = ((id % 26) + 'a'.code).toChar()
    result.append(ch)

    id /= 26
  }

  return result.toString()
}

interface CssName : DescriptionProvider {
  val name: String
    get() = if (CssSettings.shortId) {
      nextShortId()
    } else {
      "${CssSettings.preFix}-${this::class.simpleName?.hyphenize() ?: this::class}"
    }

  fun cls(): DescriptionProvider = cls(this)

  fun cssName(): String = "${this::class.simpleName?.hyphenize() ?: this::class}"

  override fun description() = name
}

open class CssId(name: String) : DescriptionProvider {
  val name: String = if (CssSettings.shortId) {
    nextShortId()
  } else {
    "daw-$name-css"
  }

  override fun description() = name

  override fun equals(other: Any?): Boolean {
    if (this === other) return true
    if (other !is CssId) return false

    if (name != other.name) return false

    return true
  }

  override fun hashCode(): Int {
    return name.hashCode()
  }

}