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 :weekdays, type: Array, default: []
  field :recurring_end_date, type: DateTime
  field :create_user_id
  field :update_user_id
  field :module_key
  field :model_cat
  field :model_page_id
  field :model_tags, type: Array, default: []
  field :is_weekdays, type: Boolean, default: false
  belongs_to :calendar_type
  field :url
  field :url_translations, type: Hash, default: {}
  field :hide_start, type: Array, default: [] # store date string, ex: ["2022-07-29"]
  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
    tmp_url = self.url
    tmp_url.blank? ? (self.model_class.blank? ? '' : (self.get_module_url rescue '')) : tmp_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
          m.add_to_calendar = false
        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
  before_save do
    self['title'] = self.title
    self['note'] = self.note
    self['url'] = self.url
    if self.hide_start_changed?
      self.hide_start.sort!
    end
    if self.is_weekdays
      self.weekdays = (1..5).to_a #平日
    else
      self.weekdays = self.weekdays.map{|s| s.to_i}.sort
    end
    true
  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(locale=I18n.locale)
    tp = self['title_translations'][locale] rescue nil
    tp.nil? ? self['title'] : tp
  end
  def note(locale=I18n.locale)
    tp = self['note_translations'][locale]
    tp.nil? ? self['note'] : tp
  end
  def url(locale=I18n.locale)
    tp = self['url_translations'][locale]
    tp.nil? ? self['url'] : tp
  end
  def self.with_categories(cat_ids=[])
    if cat_ids.blank?
      self.all
    else
      self.where(:calendar_type_id.in => cat_ids)
    end
  end
  def bulletin
    model_class=='Bulletin' ? (Bulletin.find(self.model_id) rescue nil) : 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 = {}, preserve_hide = false)
      tmp_note = self.note || ""
      if self.recurring
        freq = self.frequency.to_i
        if @week_titles.nil?
          @week_titles = CalendarSetting.first.week_title
          @weekdayst = I18n.t("calendar.weekdays")
          @dailyt = I18n.t("calendar.daily")
          @weeklyt = I18n.t("calendar.weekly")
          @monthlyt = I18n.t("calendar.monthly")
          @yearlyt = I18n.t("calendar.yearly")
          @conjt = I18n.t('calendar.conj')
          @andt = I18n.t('calendar.and')
        end
        case self.period
        when 'Daily'
          every_n_days = (freq == 1 ? @dailyt  : I18n.t("calendar.every_n_days", {:num=>self.frequency}))
          tmp_note = every_n_days + "<br>" + tmp_note
        when 'Weekly'
          if self.is_weekdays
            days = @weekdayst
          elsif self.weekdays.present?
            days = self.weekdays.map{|i| @week_titles[i]}
            if days.count > 1
              days = days[0...-1].join(@conjt) + @andt + days[-1]
            else
              days = days[0]
            end
          end
          every_n_weeks = (freq == 1 ? @weeklyt  : I18n.t("calendar.every_n_weeks", {:num=>self.frequency}))
          tmp_note = I18n.t("calendar.every_week_day", {:every_n_weeks=>every_n_weeks,:days=>days}) + "<br>" + tmp_note
        when 'Monthly'
          days = self.start.day
          every_n_months = (freq == 1 ? @monthlyt  : I18n.t("calendar.every_n_months", {:num=>self.frequency}))
          tmp_note = I18n.t("calendar.every_month_day", {:every_n_months=>every_n_months,:days=>days}) + "<br>" + tmp_note
        when 'Yearly'
          date = self.start.strftime('%m/%d')
          every_n_years = (freq == 1 ? @yearlyt  : I18n.t("calendar.every_n_years", {:num=>self.frequency}))
          tmp_note = I18n.t("calendar.every_year_day", {:every_n_years=>every_n_years,:date=>date}) + "<br>" + tmp_note
        end
      end
      hide = false
      if options["frontend"]
        if (self.recurring && self.hide_start.include?(self.start))
          hide = true
          nil
        else
          {
            :id => self.id.to_s,
            :title => self.title,
            :note => tmp_note,
            :start => self.start.to_json.gsub('"',''),
            :end => self.end.to_json.gsub('"',''),
            :allDay => self.all_day,
            :recurring => self.recurring,
            :calendar => self.calendar_type_id.to_s,
            :color => (self.calendar_type.color rescue nil),
            :diff_day => self.all_day,
            :url_linked => self.url
          }
        end
      else
        need_hide = (self.recurring && self.hide_start.include?(self.start.strftime("%Y-%m-%d")))
        unless preserve_hide
          hide = need_hide
        end
        if hide
          nil
        else
          org_color = (self.calendar_type.color rescue nil)
          {
            :id => self.id.to_s,
            :title => self.title,
            :note => tmp_note,
            :start => self.start.to_json.gsub('"',''),
            :end => self.end.to_json.gsub('"',''),
            :allDay => self.all_day,
            :recurring => self.recurring,
            :calendar => self.calendar_type_id.to_s,
            :color => (need_hide ? "#c0c0c0" : org_color),
            :diff_day => self.all_day,
            :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),
            :url_linked => self.url,
            :hide => need_hide,
            :org_color => org_color,
            :hide_color => "#c0c0c0"
          }
        end
      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(preserve_hide=false)
    self.all.collect do |re|
      re.as_json({}, preserve_hide)
    end.compact
  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, preserve_hide=false)
    @recurring_events = self.where(:recurring => true).any_of({:recurring_end_date=>nil}, {:recurring_end_date.gte=>start_date.utc})
    @recurring = []
    start_date_utc_mjd = start_date.to_datetime.new_offset(0).mjd
    @recurring_events.each do |re|
      has_recurring_end_date = re.recurring_end_date.present?
      data = re.as_json({}, true)
      period_str = nil
      is_month = false
      is_year = false
      days = 1
      interval = nil
      weekdays = nil
      if re.period == 'Daily'
        period_str = 'day'
        interval = 1.day
      elsif re.period == 'Weekly'
        period_str = 'week'
        days = 7
        interval = 1.week
        weekdays = re.weekdays
        weekdays = nil if weekdays.blank?
      elsif re.period == 'Monthly'
        period_str = 'month'
        is_month = true
        days = 30
      elsif re.period == 'Yearly'
        period_str = 'year'
        is_year = true
        days = 365
      end
      if period_str
        org_start = re.start
        @start_date = re.start
        @end_date = re.end
        freq = re.frequency.to_i
        interval = freq.send(period_str)
        tmp_hide_start =  re.hide_start.clone
        if is_month
          add_interval = ((start_date.year * 12 + start_date.month) - (@start_date.year * 12 + @start_date.month))
          add_interval = 0 if add_interval < 0
        elsif is_year
          add_interval = (start_date.year - @start_date.year)
          add_interval = 0 if add_interval < 0
        else
          add_interval = (start_date_utc_mjd - @start_date.new_offset(0).mjd)
          if add_interval < 0
            add_interval = 0
          else
            add_interval = add_interval / days
          end
        end
        rest = add_interval % freq
        if rest != 0
          add_interval += (freq - rest)
        end
        add_interval = add_interval.send(period_str)
        need_check_start = false
        if weekdays
          add_interval -= @start_date.wday.day
          need_check_start = true
        end
        tmp_start_date = [start_date, @start_date].max
        @start_date += add_interval
        @end_date += add_interval
        new_end_date = has_recurring_end_date ? [re.recurring_end_date,end_date].min : end_date
        need_check_hide = false
        if tmp_hide_start.count != 0
          tmp = @start_date.strftime("%Y-%m-%d")
          st_idx = tmp_hide_start.index{|s| s >= tmp}
          if st_idx.nil?
            tmp_hide_start = []
          else
            tmp_hide_start = tmp_hide_start[st_idx..-1]
          end
          need_check_hide = true
        else
          need_check_hide = false
        end
        while @start_date <= new_end_date do
          if weekdays
            if need_check_hide
              tmp_hide_start2 = tmp_hide_start[0..-1] #clone array
              end_check = (@start_date + 6.day).strftime("%Y-%m-%d")
              last_idx = tmp_hide_start2.index{|s| s > end_check}
              if last_idx
                tmp_hide_start2 = tmp_hide_start2[0...last_idx]
                tmp_hide_start = tmp_hide_start[last_idx..-1]
                need_check_hide = tmp_hide_start.count != 0
              end
            else
              tmp_hide_start2 = []
            end
            weekdays.each do |w|
              new_start = (@start_date + w.day)
              if need_check_start && new_start < tmp_start_date
                next
              end
              if new_start != org_start
                new_end = @end_date + w.day
                hide = need_check_hide && tmp_hide_start2.include?(new_start.strftime("%Y-%m-%d"))
                if hide
                  if preserve_hide
                    @recurring << data.merge({:start => new_start.to_json.gsub('"',''), :end => new_end.to_json.gsub('"',''), :hide=>true, :color=>"#c0c0c0"})
                  end
                else
                  @recurring << data.merge({:start => new_start.to_json.gsub('"',''), :end => new_end.to_json.gsub('"',''), :hide=>false, :color => data[:org_color]})
                end
              end
            end
            need_check_start = false
          else
            if @start_date != org_start
              hide = need_check_hide && tmp_hide_start.include?(@start_date.strftime("%Y-%m-%d"))
              if hide
                if preserve_hide
                  @recurring << data.merge({:start => @start_date.to_json.gsub('"',''), :end => @end_date.to_json.gsub('"',''), :hide=>true, :color=>"#c0c0c0"})
                end
              else
                @recurring << data.merge({:start => @start_date.to_json.gsub('"',''), :end => @end_date.to_json.gsub('"',''), :hide=>false, :color => data[:org_color]})
              end
            end
          end
          @start_date += interval
          @end_date += interval
        end
      else
        next
      end
   end
   
   @recurring
  end

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