class EventsController < ApplicationController
  before_action :set_event, only: [:show, :edit, :update, :cancel, :destroy]
  before_action :check_secret, only: [:edit, :update, :cancel, :destroy]
  before_filter :set_mailer_host

  def index
    @events = Event.moderated
    if params[:region] && params[:region].present? && params[:region] != 'all'
      @events = @events.region params[:region]
    end
    @events = @events.tag(params[:tag]) if params[:tag]

    respond_to do |format|
      format.html {
        if params[:year]
          # Whole year calendar
          @events = @events.year params[:year].to_i
        else
          if params[:start_date]
            start_date = Date.parse params[:start_date]
          else
            start_date = Date.today
          end
          @events = @events.month start_date.change day: 1
        end

        set_meta_tags description: "#{t('layouts.application.subtitle')} - #{start_date ? t('date.month_names')[start_date.month] : ''} #{start_date ? start_date.year.to_s : params[:year]} - #{t '.nb_events', count: @events.size}",
          keywords: @events.pluck(:tags)
            .join(' ')
            .split
            .group_by { |i| i }
            .reject { |k, v| v.size < 2 }
            .collect { |k, v| k },
          DC: {
            title: t('layouts.application.title'),
            subject: t('layouts.application.subtitle'),
            date: start_date.to_s
          }
      }

      format.rss {
        @events = @events.future_30.includes(:related_city)
        @events = @events.limit params[:daylimit] if params[:daylimit]
      }

      format.ics {
        @events = @events.where('start_time > ?', 360.days.ago).order :id
      }

      format.xml {
        @events = @events.order :id
      }
    end
  end

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

  # POST /events
  # POST /events.json
  def create
    @event = Event.new event_params

    if params[:visu]
      @event.valid?
      render action: :new
      return
    end

    respond_to do |format|
      if @event.save
        # Send an event creation mail to its author
        EventMailer.create(@event).deliver
        # Send a mail to moderators
        ModerationMailer.create(@event).deliver

        format.html { redirect_to :root, notice: t('.ok') }
        format.json { render action: 'show', status: :created, location: @event }
      else
        format.html { render action: 'new' }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /events/1
  # PATCH/PUT /events/1.json
  def update
    olderEvent = Event.new @event.attributes
    if params[:visu]
      @event.attributes = event_params
      @event.valid?
      render action: :edit
      return
    end

    respond_to do |format|
      if @event.update event_params
        # Send an update mail to moderators
        ModerationMailer.update(olderEvent, @event, nil).deliver

        format.html { redirect_to :root, notice: t('.ok') }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end

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

  private
    # 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]

      set_meta_tags title: @event.title,
        description: @event.description,
        keywords: @event.tags,
        DC: {
          title: @event.title,
          date: @event.start_time.to_s
        },
        geo: {
          region: @event.related_region,
          placename: @event.city,
          position: "#{@event.related_city.try :latitude};#{@event.related_city.try :longitude}"
        }
    end

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

    def check_secret
      if params[:secret] != @event.secret
        redirect_to :root, notice: t(:forbidden, scope: [:events, :edit])
      end
    end

    # Useful to manage absolute url in mails
    def set_mailer_host
      ActionMailer::Base.default_url_options[:host] = request.host_with_port
    end
end