require_dependency 'topic_subtype'

class Report

  attr_accessor :type, :data, :total, :prev30Days, :start_date, :end_date

  def self.default_days
    30
  end

  def initialize(type)
    @type = type
    @data = nil
    @total = nil
    @prev30Days = nil
    @start_date ||= 1.month.ago.utc.beginning_of_day
    @end_date ||= Time.now.utc.end_of_day
  end

  def as_json(options = nil)
    {
     type: type,
     title: I18n.t("reports.#{type}.title"),
     xaxis: I18n.t("reports.#{type}.xaxis"),
     yaxis: I18n.t("reports.#{type}.yaxis"),
     data: data,
     total: total,
     start_date: start_date,
     end_date: end_date,
     prev30Days: self.prev30Days
    }
  end

  def self.find(type, opts=nil)
    opts ||= {}
    report_method = :"report_#{type}"
    return nil unless respond_to?(report_method)

    # Load the report
    report = Report.new(type)

    report.start_date = opts[:start_date] if opts[:start_date]
    report.end_date = opts[:end_date] if opts[:end_date]
    send(report_method, report)
    report
  end

  def self.report_visits(report)
    basic_report_about report, UserVisit, :by_day, report.start_date, report.end_date
  end

  def self.report_signups(report)
    report_about report, User.real, :count_by_signup_date
  end

  def self.report_topics(report)
    basic_report_about report, Topic, :listable_count_per_day, report.start_date, report.end_date
    add_counts report, Topic.listable_topics, 'topics.created_at'
  end

  def self.report_posts(report)
    basic_report_about report, Post, :public_posts_count_per_day, report.start_date, report.end_date
    add_counts report, Post.public_posts, 'posts.created_at'
  end

  def self.report_emails(report)
    report_about report, EmailLog
  end

  def self.report_about(report, subject_class, report_method = :count_per_day)
    basic_report_about report, subject_class, report_method, report.start_date, report.end_date
    add_counts report, subject_class
  end

  def self.basic_report_about(report, subject_class, report_method, *args)
    report.data = []
    subject_class.send(report_method, *args).each do |date, count|
      report.data << {x: date, y: count}
    end
  end

  def self.add_counts(report, subject_class, query_column = 'created_at')
    report.total      = subject_class.count
    report.prev30Days = subject_class.where("#{query_column} >= ? and #{query_column} < ?", report.start_date - 30.days, report.start_date).count
  end

  def self.report_users_by_trust_level(report)
    report.data = []
    User.real.group('trust_level').count.each do |level, count|
      report.data << {x: level.to_i, y: count}
    end
  end

  # Post action counts:
  def self.report_flags(report)
    basic_report_about report, PostAction, :flag_count_by_date, report.start_date, report.end_date
    add_counts report, PostAction.where(post_action_type_id: PostActionType.flag_types.values), 'post_actions.created_at'
  end

  def self.report_likes(report)
    post_action_report report, PostActionType.types[:like]
  end

  def self.report_bookmarks(report)
    post_action_report report, PostActionType.types[:bookmark]
  end

  def self.post_action_report(report, post_action_type)
    report.data = []
    PostAction.count_per_day_for_type(post_action_type).each do |date, count|
      report.data << { x: date, y: count }
    end
    add_counts report, PostAction.unscoped.where(post_action_type_id: post_action_type), 'post_actions.created_at'
  end

  # Private messages counts:

  def self.private_messages_report(report, topic_subtype)
    basic_report_about report, Post, :private_messages_count_per_day, default_days, topic_subtype
    add_counts report, Post.private_posts.with_topic_subtype(topic_subtype), 'posts.created_at'
  end

  def self.report_user_to_user_private_messages(report)
    private_messages_report report, TopicSubtype.user_to_user
  end

  def self.report_system_private_messages(report)
    private_messages_report report, TopicSubtype.system_message
  end

  def self.report_moderator_warning_private_messages(report)
    private_messages_report report, TopicSubtype.moderator_warning
  end

  def self.report_notify_moderators_private_messages(report)
    private_messages_report report, TopicSubtype.notify_moderators
  end

  def self.report_notify_user_private_messages(report)
    private_messages_report report, TopicSubtype.notify_user
  end
end