Add circle posts history support (#18)

* Wip: make web backend

* Wip: keep statuses if edit circle

* Wip: Add circle history page and record circle posts

* Add circle post to history in web ui when post

* Add test

app/controllers/api/v1/circles/statuses_controller.rb

@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+class Api::V1::Circles::StatusesController < Api::BaseController
+  before_action -> { doorkeeper_authorize! :read, :'read:lists' }, only: [:show]
+  before_action -> { doorkeeper_authorize! :write, :'write:lists' }, except: [:show]
+
+  before_action :require_user!
+  before_action :set_circle
+
+  after_action :insert_pagination_headers, only: :show
+
+  def show
+    @statuses = load_statuses
+    render json: @statuses, each_serializer: REST::StatusSerializer
+  end
+
+  private
+
+  def set_circle
+    @circle = current_account.circles.find(params[:circle_id])
+  end
+
+  def load_statuses
+    if unlimited?
+      @circle.statuses.includes(:status_stat).all
+    else
+      @circle.statuses.includes(:status_stat).paginate_by_max_id(limit_param(DEFAULT_STATUSES_LIMIT), params[:max_id], params[:since_id])
+    end
+  end
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def next_path
+    return if unlimited?
+
+    api_v1_circle_statuses_url pagination_params(max_id: pagination_max_id) if records_continue?
+  end
+
+  def prev_path
+    return if unlimited?
+
+    api_v1_circle_statuses_url pagination_params(since_id: pagination_since_id) unless @statuses.empty?
+  end
+
+  def pagination_max_id
+    @statuses.last.id
+  end
+
+  def pagination_since_id
+    @statuses.first.id
+  end
+
+  def records_continue?
+    @statuses.size == limit_param(DEFAULT_STATUSES_LIMIT)
+  end
+
+  def pagination_params(core_params)
+    params.slice(:limit).permit(:limit).merge(core_params)
+  end
+
+  def unlimited?
+    params[:limit] == '0'
+  end
+end