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path: root/src/main/scala/reading/component/index/Menu.scala
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package reading.component.index

import rx._

import scalatags.JsDom.all._
import scalacss.Defaults._
import scalacss.ScalatagsCss._

import reading.component.index.style.{ Menu => MenuStyle }
import reading.models._
import reading.utils.RxUtils._

object Menu {
  def apply(
    books: Rx[Seq[Book]],
    filters: Var[Seq[Filter]],
    search: Var[String],
    showFiltersMenu: Var[Boolean]
  )(
    implicit
    ctx: Ctx.Owner
  ): Frag =
    div(
      MenuStyle.render,
      Rx(if (showFiltersMenu()) MenuStyle.show else MenuStyle.empty),
      MenuStyle.menu,

      div(MenuStyle.background),

      div(
        MenuStyle.content,

        Rx(header(showFiltersMenu, filters().length)),

        div(
          MenuStyle.groups,
          Rx {
            filters().find(_.kind == FilterKind.Grade) match {
              case Some(grade) =>
                val programs = Program.values.filter(p => Program.grade(p).toString() == grade.nonFormattedName)
                group(books, filters, search, grade.name, programs.map(Filter.apply(_)), Some(grade))
              case None =>
                group(books, filters, search, "Classe", Grade.values.map(Filter.apply(_)))
            }
          },
          Rx {
            filters().find(_.kind == FilterKind.GroupedTheme) match {
              case Some(groupedTheme) =>
                val themes = Theme.values.filter(t => Theme.groupedTheme(t).toString() == groupedTheme.nonFormattedName)
                group(books, filters, search, groupedTheme.name, themes.map(Filter.apply(_)), Some(groupedTheme))
              case None =>
                group(books, filters, search, "Theme", GroupedTheme.values.map(Filter.apply(_)))
            }
          },
          group(books, filters, search, "Genre", Genre.values.sorted.map(Filter.apply(_))),
          group(books, filters, search, "Niveau", Level.values.map(Filter.apply(_))),
          group(books, filters, search, "Période", Period.values.map(Filter.apply(_)))
        ),

        footer(books, filters, search, showFiltersMenu)
      )
    )

  def header(showFiltersMenu: Var[Boolean], count: Int): Frag =
    div(
      MenuStyle.header,
      "Filtrer",
      if (count > 0) span(MenuStyle.filtersCount, count) else span("")
    )

  def group(
    books: Rx[Seq[Book]],
    filters: Var[Seq[Filter]],
    search: Var[String],
    name: String,
    groupFilters: Seq[Filter],
    parentFilter: Option[Filter] = None
  )(
    implicit
    ctx: Ctx.Owner
  ): Frag = {
    val filtersWithCount = Rx {
      groupFilters
        .map(filter => (filter, Filter.add(books(), filter).length))
        .filter(_._2 > 0)
    }

    Rx {
      if (filtersWithCount().isEmpty)
        span("")
      else
        div(
          div(
            MenuStyle.filterTitle,
            parentFilter.map { filter =>
              onclick := (() => FilterUtils.remove(filters, search, filter))
            }.getOrElse(""),
            if (parentFilter.isDefined) MenuStyle.activeFilter else "",
            name,
            Rx {
              val count = filters().filter(f => groupFilters.exists(f == _)).length
              if (count > 0) span(MenuStyle.filterTitleCount, count) else span("")
            }
          ),
          div(
            filtersWithCount().map {
              case (filter, count) => {
                val isActive = Filter.contains(filters(), filter)

                button(
                  MenuStyle.filter,
                  if (isActive) MenuStyle.activeFilter else "",
                  onclick := (() =>
                    if (isActive)
                      FilterUtils.remove(filters, search, filter)
                    else
                      FilterUtils.add(filters, search, filter)),
                  span(
                    span(filter.name.capitalize),
                    span(MenuStyle.filterCount, count)
                  )
                )
              }
            }
          )
        )
    }
  }

  def footer(
    books: Rx[Seq[Book]],
    filters: Var[Seq[Filter]],
    search: Var[String],
    showFiltersMenu: Var[Boolean]
  )(
    implicit
    ctx: Ctx.Owner
  ): Frag =
    div(
      MenuStyle.footer,
      div(
        MenuStyle.clear,
        onclick := (() => FilterUtils.removeAll(filters, search)),
        "Effacer"
      ),
      div(
        MenuStyle.returnToBooks,
        onclick := (() => showFiltersMenu() = false),
        "Afficher",
        Rx {
          span(MenuStyle.bookCount, books().length)
        }
      )
    )
}