Move poll shifts form partial to a component

Thanks to it, we can move a few helper methods to the component.

app/components/admin/poll/shifts/form_component.html.erb

@@ -0,0 +1,42 @@
+<%= form_for shift, as: :shift, url: admin_booth_shifts_path do |f| %>
+  <%= render "shared/errors", resource: shift %>
+
+  <fieldset class="fieldset">
+    <legend>
+      <%= t("admin.poll_shifts.new.new_shift") %>
+    </legend>
+
+    <div class="small-12 medium-3 column highlight padding">
+      <strong><%= t("admin.poll_shifts.new.officer") %></strong>
+      <br><%= officer.name %>
+      <%= f.hidden_field :officer_id, value: officer.id %>
+    </div>
+
+    <div class="small-12 medium-3 column">
+      <%= f.select :task,
+                   Poll::Shift.tasks.map { |k, v| [t("admin.poll_shifts.#{k}"), k] },
+                   { prompt: t("admin.poll_shifts.new.select_task") },
+                   class: "js-poll-shifts" %>
+    </div>
+
+    <div class="small-12 medium-3 column">
+      <label><%= t("admin.poll_shifts.new.date") %></label>
+      <%= select "shift[date]", "vote_collection_date",
+                 options_for_select(shift_vote_collection_dates(booth, voting_polls)),
+                 { prompt: voting_polls.present? ? t("admin.poll_shifts.new.select_date") : t("admin.poll_shifts.new.no_voting_days") },
+                 class: "js-shift-vote-collection-dates" %>
+      <%= select "shift[date]", "recount_scrutiny_date",
+                 options_for_select(shift_recount_scrutiny_dates(booth, recount_polls)),
+                 { prompt: t("admin.poll_shifts.new.select_date") },
+                 class: "js-shift-recount-scrutiny-dates",
+                 hidden: "hidden" %>
+    </div>
+
+    <%= f.hidden_field :booth_id, value: booth.id %>
+
+    <div class="small-12 medium-3 column">
+      <%= f.submit t("admin.poll_shifts.new.add_shift"),
+                   class: "button expanded margin-top" %>
+    </div>
+  </fieldset>
+<% end %>

app/components/admin/poll/shifts/form_component.rb

@@ -0,0 +1,56 @@
+class Admin::Poll::Shifts::FormComponent < ApplicationComponent
+  attr_reader :shift, :booth, :officer
+
+  def initialize(shift, booth:, officer:)
+    @shift = shift
+    @booth = booth
+    @officer = officer
+  end
+
+  private
+
+    def voting_polls
+      booth.polls.current
+    end
+
+    def recount_polls
+      booth.polls.current_or_recounting
+    end
+
+    def shift_vote_collection_dates(booth, polls)
+      return [] if polls.blank?
+
+      date_options((start_date(polls)..end_date(polls)), Poll::Shift.tasks[:vote_collection], booth)
+    end
+
+    def shift_recount_scrutiny_dates(booth, polls)
+      return [] if polls.blank?
+
+      dates = polls.map(&:ends_at).map(&:to_date).sort.reduce([]) do |total, date|
+        initial_date = [date, Date.current].max
+        total << (initial_date..date + Poll::RECOUNT_DURATION).to_a
+      end
+      date_options(dates.flatten.uniq, Poll::Shift.tasks[:recount_scrutiny], booth)
+    end
+
+    def date_options(dates, task_id, booth)
+      valid_dates(dates, task_id, booth).map { |date| [l(date, format: :long), l(date)] }
+    end
+
+    def valid_dates(dates, task_id, booth)
+      dates.reject { |date| officer_shifts(task_id, booth).include?(date) }
+    end
+
+    def start_date(polls)
+      start_date = polls.minimum(:starts_at).to_date
+      [start_date, Date.current].max
+    end
+
+    def end_date(polls)
+      polls.maximum(:ends_at).to_date
+    end
+
+    def officer_shifts(task_id, booth)
+      officer.shifts.where(task: task_id, booth: booth).map(&:date)
+    end
+end