bingo: add, delete and reorder datacenters from admin

The card was fixed to the 25 seeded rows, so a new site such as
IXcellerate MOS7 (34 MW, under construction) could only be shoehorned in
by overwriting an existing row. Add create and delete (cascading to
incidents), make position an insert that shifts the rest, and keep
positions dense. More than 25 rows are allowed: the card shows the first
25 and the rest wait in reserve. "Sort by MW" re-ranks by the parsed
power figure, unknown last.

Assisted-by: Claude:opus-5

lib/bingo.rb

@@ -238,6 +238,34 @@ module Bingo
     end
   end
 
+  # Positions stay dense 1..N; the card shows the first SIZE*SIZE, the rest
+  # wait in reserve. Placing a datacenter inserts it at pos (default: last)
+  # and shifts everyone after it.
+  def self.place!(dc, pos = nil)
+    DB.connection.transaction do
+      ids = Datacenter.exclude(id: dc.id).order(:position, :id).select_map(:id)
+      pos = (pos || ids.size + 1).clamp(1, ids.size + 1)
+      renumber!(ids.insert(pos - 1, dc.id))
+    end
+  end
+
+  def self.renumber!(ids = Datacenter.order(:position, :id).select_map(:id))
+    ids.each_with_index { |id, i| Datacenter.where(id: id).update(position: i + 1) }
+  end
+
+  # "64" → 64.0, "25–30" → 30.0, ">40" → 40.0, "13,7" → 13.7, "" → nil
+  def self.mw_value(mw)
+    mw.to_s.tr(',', '.').scan(/\d+(?:\.\d+)?/).map(&:to_f).max
+  end
+
+  # Rank by power, unknown last; ties keep their current order.
+  def self.sort_by_mw!
+    DB.connection.transaction do
+      renumber!(Datacenter.order(:position, :id).all
+                          .sort_by.with_index { |dc, i| [-(mw_value(dc.mw) || -1), i] }.map(&:id))
+    end
+  end
+
   # First boot: fill the card (and any already-known incidents) from
   # db/bingo_seed.json. Never touches rows once any exist; edits happen in
   # /admin/bingo.

lib/bingo_admin.rb

@@ -15,6 +15,21 @@ module BingoAdmin
       s.empty? || s.match?(URI::DEFAULT_PARSER.make_regexp(%w[http https]))
     end
 
+    def position_param
+      params[:position].to_s =~ /\A\d+\z/ ? params[:position].to_i : nil
+    end
+
+    # Copies the edit form onto dc (position is handled by Bingo.place!).
+    def assign_dc(dc)
+      DC_TEXT.each { |f| dc[f.to_sym] = blank_nil(params[f]) }
+      dc.year   = params[:year].to_s =~ /\A\d{4}\z/ ? params[:year].to_i : nil
+      dc.status = 'operational' unless %w[operational building].include?(dc.status)
+      errs = []
+      errs << 'Name (ru), city (ru) and operator are required' if [dc.name_ru, dc.city_ru, dc.operator].any?(&:nil?)
+      errs << 'URLs must be http(s)' unless [dc.photo_source_url, dc.info_url].all? { |u| http_url?(u.to_s) }
+      errs
+    end
+
     def blank_nil(s)
       s = s.to_s.strip
       s.empty? ? nil : s
@@ -33,6 +48,33 @@ module BingoAdmin
       erb :'admin/bingo/index'
     end
 
+    app.get '/admin/bingo/dc/new' do
+      @dc = Bingo::Datacenter.new(status: 'operational')
+      @page_title = 'New datacenter · bingo admin'
+      @noindex    = true
+      erb :'admin/bingo/edit'
+    end
+
+    app.post '/admin/bingo/dc' do
+      @dc = Bingo::Datacenter.new
+      @dc.slug = params[:slug].to_s.strip.downcase
+      errs = assign_dc(@dc)
+      errs.unshift('Slug: lowercase letters, digits and dashes') unless @dc.slug.match?(/\A[a-z0-9]+(-[a-z0-9]+)*\z/)
+      errs.unshift('Slug already taken') if Bingo::Datacenter.where(slug: @dc.slug).any?
+      if errs.any?
+        @flash = errs.join('; ')
+        @page_title = 'New datacenter · bingo admin'
+        @noindex    = true
+        status 422
+        return erb :'admin/bingo/edit'
+      end
+      @dc.position = Bingo::Datacenter.count + 1
+      @dc.save
+      Bingo.place!(@dc, position_param)
+      session[:bingo_flash] = "Added #{@dc.name_ru} at ##{@dc.refresh.position}."
+      redirect "/admin/bingo/dc/#{@dc.id}"
+    end
+
     app.get '/admin/bingo/dc/:id' do
       @dc = Bingo::Datacenter[params[:id].to_i] or halt 404
       @page_title = "#{@dc.name_ru} · bingo admin"
@@ -43,15 +85,10 @@ module BingoAdmin
 
     app.post '/admin/bingo/dc/:id' do
       dc = Bingo::Datacenter[params[:id].to_i] or halt 404
-      DC_TEXT.each { |f| dc[f.to_sym] = blank_nil(params[f]) }
-      dc.position = params[:position].to_i if params[:position].to_s =~ /\A\d+\z/
-      dc.year     = params[:year].to_s =~ /\A\d{4}\z/ ? params[:year].to_i : nil
-      dc.status   = 'operational' unless %w[operational building].include?(dc.status)
-      errs = []
-      errs << 'Name (ru), city (ru) and operator are required' if [dc.name_ru, dc.city_ru, dc.operator].any?(&:nil?)
-      errs << 'URLs must be http(s)' unless [dc.photo_source_url, dc.info_url].all? { |u| http_url?(u.to_s) }
+      errs = assign_dc(dc)
       if errs.empty?
         dc.save_changes
+        Bingo.place!(dc, position_param) if position_param && position_param != dc.position
         session[:bingo_flash] = 'Saved.'
       else
         session[:bingo_flash] = errs.join('; ')
@@ -59,6 +96,25 @@ module BingoAdmin
       redirect "/admin/bingo/dc/#{dc.id}"
     end
 
+    # Deletes the row and (FK cascade) its incidents; the photo object stays
+    # in the bucket.
+    app.post '/admin/bingo/dc/:id/delete' do
+      dc = Bingo::Datacenter[params[:id].to_i] or halt 404
+      n  = dc.incidents.size
+      DB.connection.transaction do
+        dc.destroy
+        Bingo.renumber!
+      end
+      session[:bingo_flash] = "Deleted #{dc.name_ru}#{" and #{n} incident(s)" if n.positive?}."
+      redirect '/admin/bingo'
+    end
+
+    app.post '/admin/bingo/sort' do
+      Bingo.sort_by_mw!
+      session[:bingo_flash] = 'Sorted by MW (unknown last).'
+      redirect '/admin/bingo'
+    end
+
     # Either an uploaded file or "import from URL" (defaults to photo_source_url).
     app.post '/admin/bingo/dc/:id/photo' do
       dc = Bingo::Datacenter[params[:id].to_i] or halt 404