# Event life cycle
# This is a central part to this project
class EventsController < ApplicationController
  has_scope :region, :locality, :tag, :daylimit

  before_action :set_events, only: [:index]
  before_action :set_event, except: [:index, :new, :preview_create, :create]
  before_action :set_create_event, only: [:preview_create, :create]
  before_action :check_secret, only: [:edit, :preview, :update, :destroy]
  before_action :set_old_event, only: [:update]
  before_action :set_mailer_host
  rescue_from ActiveRecord::StaleObjectError, with: :locked

  def index
    respond_to do |format|
      format.html { render layout: 'iframe' if params[:iframe] }
      format.rss { @events = @events.future }
      format.ics { @events = @events.last_year }
      format.xml { @events = @events.includes :related_region }
    end
  end

  # GET /users/new
  def new
    @event = Event.new start_time: Time.now.change(min: 0) + 1.day + 1.hour,
                       end_time: Time.now.change(min: 0) + 1.day + 2.hour
  end

  # POST /events/preview
  def preview_create
    @event.valid?
    render action: :new
  end

  # POST /events
  # POST /events.json
  def create
    respond_to do |format|
      if @event.save && send_creation_mails
        format.html { redirect_to :root, notice: t('.ok') }
        # 201 means :created
        format.json { render action: 'show', status: 201, location: @event }
      else
        format.html { render action: 'new' }
        # 422 means :unprocessable_entity
        format.json { render json: @event.errors, status: 422 }
      end
    end
  end

  # PATCH/PUT /events/1/preview
  def preview
    @event.attributes = event_params
    @event.valid?
    render action: :edit
  end

  # PATCH/PUT /events/1
  # PATCH/PUT /events/1.json
  def update
    respond_to do |format|
      if @event.update(event_params) && send_update_mails
        format.html { redirect_to :root, notice: t('.ok') }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        # 422 means :unprocessable_entity
        format.json { render json: @event.errors, status: 422 }
      end
    end
  end

  # DELETE /events/1
  # DELETE /events/1.json
  def destroy
    @event.destroy
    respond_to do |format|
      format.html { redirect_to :root, notice: t('.ok') }
      format.json { head :no_content }
    end
  end

  private

  def set_events
    @events = apply_scopes Event.moderated
  end

  # Use callbacks to share common setup or constraints between actions
  def set_event
    if params[:secret].present?
      @event = Event.where secret: params[:secret]
    else
      @event = Event.moderated
    end
    @event = @event.find params[:id]
  end

  def set_create_event
    @event = Event.new event_params
  end

  def set_old_event
    @older_event = Event.new @event.attributes
  end

  # Never trust parameters from the scary internet, only allow the white list
  # through
  def event_params
    params.require(:event)
      .permit :lock_version, :title, :start_time, :end_time, :description,
              :address, :city, :region, :locality, :url, :contact, :submitter,
              :tags
  end

  # Check that you can only edit an existing event if you know its secret
  def check_secret
    redirect_to :root, alert: t(:forbidden, scope: [:events, :edit]) \
      unless params[:secret] == @event.secret
  end

  def send_creation_mails
    # Send an event creation mail to its author
    EventMailer.create(@event).deliver_now
    # Send a mail to moderators
    ModerationMailer.create(@event).deliver_now
  end

  def send_update_mails
    # Send an update mail to moderators
    ModerationMailer.update(@older_event, @event, nil).deliver_now
  end

  def locked
    redirect_to edit_event_url(@event, secret: @event.secret),
                alert: t('staleObjectError')
  end
end