require 'time'
require 'date'

class Event
  include Mongoid::Document
  include Mongoid::Timestamps
  include OrbitTag::Taggable
  # include Mongoid::MultiParameterAttributes

  field :title
  field :note
  field :title_translations,type: Hash,default: {}
  field :note_translations,type: Hash,default: {}
  field :start, type: DateTime
  field :end, type: DateTime
  field :all_day, type: Boolean,default: false
  field :recurring, type: Boolean,default: false
  field :frequency
  field :period
  field :create_user_id
  field :update_user_id
  field :module_key
  field :model_cat
  field :model_page_id
  field :model_tags,type: Array,default: []
  belongs_to :calendar_type
  field :url
  def get_module_url
    page = !self.model_page_id.blank? ? Page.find(self.model_page_id): Page.where(:module => self.module_key).where(:categories.in => Array(self.model_cat)+[[]],:tags.in=>Array(self.model_tags)+[[]]).first
    page.nil? ? '' : (page.url+'/'+eval(self.model_class).where(:id=>self.model_id).first.to_calendar_param)
  end
  def url_to_fronted
    self.url.blank? ? (self.model_class.blank? ? '' : self.get_module_url) : self.url
  end
  attr_accessor :agenda_start, :agenda_end, :get_agenda_events
  
  #let other model can connect to this model
  field :key
  field :model_class
  field :model_id
  before_destroy do
    if !self.model_class.blank?
      m = eval(self.model_class).where(id: self.model_id).first rescue nil
      if !m.nil?
        if self.key.nil?
          m.event_id = nil
        else
          m.calendar_dict.delete(self.key)
          if !m['calendar_data'].nil?
            tmp = m['calendar_data']
            tmp['key'] = Array(tmp['key']) - [self.key]
            m['calendar_data'] = tmp
          end
        end
        m.save
      end
    end
  end
  ########################################
  validates_presence_of :title, :message => "Please fill the title of the Event", :if => lambda { self['title_translations'].blank? }
  validates_presence_of :title_translations, :message => "Please fill the title of the Event", :if => lambda { self['title'].blank? }
  def title
    tp = self['title_translations'][I18n.locale]
    tp.blank? ? self['title'] : tp 
  end
  def note
    tp = self['note_translations'][I18n.locale]
    tp.blank? ? self['note'] : tp 
  end
  def self.with_categories(cat_ids=[])
    if cat_ids.blank?
      self.all
    else
      type_ids = CalendarType.where(:category_id.in=>cat_ids).pluck(:id)
      self.where(:calendar_type_id.in => type_ids)
    end
  end
  def bulletin
    Bulletin.find(self.bulletin_id) rescue nil
  end
  def self.format_date(date_time)
    Time.at(date_time.to_i).to_formatted_s(:db)
  end

  REPEATS = [
              "Daily" ,
              "Weekly" ,
              "Monthly" ,
              "Yearly"
  ]

    def as_json(options = {})
     if options["frontend"]
      {
        :id => self.id.to_s,
        :title => self.title,
        :note => self.note || "",
        :start => self.start.rfc822,
        :end => self.end.rfc822,
        :allDay => self.all_day,
        :recurring => self.recurring,
        :calendar => self.calendar_type_id.to_s,
        :color => (self.calendar_type.color rescue nil)
      }
     else
      {
        :id => self.id.to_s,
        :title => self.title,
        :note => self.note || "",
        :start => self.start.rfc822,
        :end => self.end.rfc822,
        :allDay => self.all_day,
        :recurring => self.recurring,
        :calendar => self.calendar_type_id.to_s,
        :color => (self.calendar_type.color rescue nil),
        :edit_url => Rails.application.routes.url_helpers.edit_admin_calendar_path(:locale=>I18n.locale, :id=>self.id),
        :delete_url =>  Rails.application.routes.url_helpers.admin_calendar_path(:locale=>I18n.locale, :id=>self.id)
      }
    end

  end

  def self.monthly_event(start_date,end_date)
    self.any_of({:start.lte => start_date,:end.gte => start_date},{:start.gte => start_date,:end.lte => end_date},{:start.lte => end_date,:end.gte => end_date}).asc(:start)
  end
  def self.convert_front
    self.all.collect do |re|
      edit_url = Rails.application.routes.url_helpers.edit_admin_calendar_path(:locale=>I18n.locale, :id=>re.id)
      delete_url = Rails.application.routes.url_helpers.admin_calendar_path(:locale=>I18n.locale, :id=>re.id)
      {:id => re.id.to_s, :title=>re.title, :note=>re.note || "", :allDay => re.all_day, :recurring => re.recurring, :calendar => re.calendar_type.id.to_s, :color => re.calendar_type.color, :edit_url => edit_url, :delete_url => delete_url, :url_linked => re.url_to_fronted, :start => re.start, :end => re.end}
    end
  end
  def self.get_diff_month(date1,date2)
    (date2.year-date1.year)*12+(date2.month-date1.month)
  end
  def self.recurring_event(start_date,end_date)
    @recurring_events = self.where(:recurring => true)
    @recurring = []
    @recurring_events.each do |re|
      edit_url = Rails.application.routes.url_helpers.edit_admin_calendar_path(:locale=>I18n.locale, :id=>re.id)
      delete_url = Rails.application.routes.url_helpers.admin_calendar_path(:locale=>I18n.locale, :id=>re.id)
      data = {:id => re.id.to_s, :title=>re.title, :note=>re.note || "", :allDay => re.all_day, :recurring => re.recurring, :calendar => re.calendar_type.id.to_s, :color => re.calendar_type.color, :edit_url => edit_url, :delete_url => delete_url, :url_linked => re.url_to_fronted}
      case re.period
      when 'Daily'
        days = (end_date.to_date-re.start.to_date).to_i
        freq = re.frequency.to_i
        start_key = (start_date.to_date-re.start.to_date).to_i
        start_key = 1 if start_key<0
        (start_key..days).each do |i|
          if i%freq==0
            @start_date = re.start + i
            @end_date = re.end + i
            @recurring << data.merge({:start => @start_date, :end => @end_date})
          end
        end
      when "Weekly"
          @start_date = re.start
          @edn_date = re.end
          @i = TimeDifference.between(re.start.to_date,end_date.to_date).in_weeks.to_i
          (1..@i).each do |i|
            @start_date += (7*re.frequency.to_i)
            @end_date += (7*re.frequency.to_i)
            @recurring << data.merge({:start => @start_date, :end => @end_date})
          end
      when "Monthly"
        if !(start_date..end_date).cover?(re.start) && start_date.to_datetime>re.start
          sd = re.start
          ed = re.end
          end_datetime = end_date.to_datetime
          start_datetime = start_date.to_datetime
          months = self.get_diff_month(sd,start_datetime)..self.get_diff_month(sd,end_datetime)
          months.each do |diff_month|
            if (diff_month%re.frequency.to_i)==0 
              sd_tp = sd + diff_month.month
              ed_tp = ed + diff_month.month
              if sd_tp>start_date
                @recurring << data.merge({:start => sd_tp, :end => ed_tp})
              end
            end
          end
        end
      when "Yearly"
        if !(start_date..end_date).cover?(re.start)
          sd = re.start
          ed = re.end
          start_datetime = start_date.to_datetime
          end_datetime = end_date.to_datetime
          if start_datetime>sd && start_datetime.year != sd.year
            ((start_datetime.year-sd.year)..(end_datetime.year-sd.year)).each do |year_diff|
              if (year_diff%re.frequency.to_i)==0
                sd_tp = sd + year_diff.year
                ed_tp = ed + year_diff.year
                @recurring << data.merge({:start => sd_tp, :end => ed_tp})
              end
            end
          end
        end
      end
   end
   
   @recurring
  end

  def self.agenda_events(agenda_start, agenda_end)
    recurring = self.recurring_event(agenda_start,agenda_end)
    events = self.monthly_event(agenda_start, agenda_end).convert_front
    all_events = recurring.concat(events)
    recurring
  end
end