# Copyright (C) 2012-2023 Zammad Foundation, https://zammad-foundation.org/

class Service::Ticket::Article::Create < Service::BaseWithCurrentUser
  def execute(article_data:)
    ticket_id = article_data.delete(:ticket_id)

    if Ticket.find(ticket_id).nil?
      raise ActiveRecord::RecordNotFound, "Ticket #{ticket_id} for new article could not be found."
    end

    create_article(article_data, ticket_id)
  end

  private

  def create_article(article_data, ticket_id)

    attachments_raw = article_data.delete(:attachments) || {}
    form_id         = attachments_raw[:form_id]

    preprocess_article_data(article_data)

    Ticket::Article.new(article_data).tap do |article|
      transform_article(article, ticket_id, attachments_raw)

      article.save!

      if article_data[:time_unit].present?
        time_accounting(article, article_data[:time_unit])
      end

      form_id_cleanup(form_id) if form_id.present?
    end
  end

  def preprocess_article_data(article_data)
    # Coerce recipient lists.
    %i[to cc].each do |field|
      if article_data[field].is_a? Array
        article_data[field] = article_data[field].join(', ')
      end
    end
  end

  def transform_article(article, ticket_id, attachments_raw)
    article.ticket_id = ticket_id
    article.attachments = attachments(article, attachments_raw)

    transform_to_from(article)

    article
  end

  def transform_to_from(article)
    ticket = Ticket.find(article.ticket_id)
    customer_display_name = display_name(ticket.customer)
    group_name = ticket.group.name

    if article.sender.name.eql?('Customer')
      article.from = customer_display_name
      article.to = group_name
    else
      article.to ||= customer_display_name
      article.from = group_name
    end
  end

  def display_name(user)
    if user.fullname.present? && user.email.present?
      return Mail::Address.new.tap do |addr|
               addr.display_name = user.fullname
               addr.address = user.email
             end.format
    end

    return user.fullname if user.fullname.present?

    display_name_fallback(user)
  end

  def display_name_fallback(user)
    return user.email if user.email.present?
    return user.phone if user.phone.present?
    return user.login if user.login.present?

    '-'
  end

  def attachments(article, attachments_raw)
    inline_attachments = []
    if article.body && article.content_type&.match?(%r{text/html}i)
      (article.body, inline_attachments) = HtmlSanitizer.replace_inline_images(article.body, article.ticket_id)
    end

    form_id = attachments_raw[:form_id]

    attachments = form_id ? UploadCache.new(form_id).attachments : []

    # Limit attachments to the ones that were really sent.
    attachments = limit_attachments(attachments, attachments_raw[:files])

    # Do not forget inline attachments.
    inline_attachments_map(inline_attachments, attachments)

    attachments
  end

  def inline_attachments_map(inline_attachments, attachments)
    inline_attachments.each do |attachment_inline|
      attachments.push({
                         data:        attachment_inline[:data],
                         filename:    attachment_inline[:filename],
                         preferences: attachment_inline[:preferences],
                       })
    end
  end

  def limit_attachments(attachments, file_meta)
    return attachments if file_meta.blank?

    attachments.reject { |attachment| file_meta.none? { |file| check_attachment_match(attachment, file) } }
  end

  def check_attachment_match(attachment, file)
    if file[:type].present? && attachment[:preferences].present? && attachment[:preferences]['Content-Type'].present?
      file[:name] == attachment[:filename] && file[:type] == attachment[:preferences]['Content-Type']
    end

    file[:name] == attachment[:filename]
  end

  def time_accounting(article, time_unit)
    Ticket::TimeAccounting.create!(
      ticket_id:         article.ticket_id,
      ticket_article_id: article.id,
      time_unit:         time_unit,
    )
  end

  def form_id_cleanup(form_id)
    # clear in-progress state from taskbar
    Taskbar
      .where(user_id: current_user.id)
      .first { |taskbar| taskbar.persisted_form_id == form_id }&.update!(state: {})

    # remove temporary attachment cache
    UploadCache.new(form_id).destroy
  end
end