module Whatsapp::BaileysHandlers::MessagesUpsert
  include Whatsapp::BaileysHandlers::Helpers
  include BaileysHelper

  private

  def process_messages_upsert
    messages = processed_params[:data][:messages]
    messages.each do |message|
      @message = nil
      @contact_inbox = nil
      @contact = nil
      @raw_message = message

      next handle_message if incoming?

      # NOTE: Shared lock with Whatsapp::SendOnWhatsappService
      # Avoids race conditions when sending messages.
      with_baileys_channel_lock_on_outgoing_message(inbox.channel.id) { handle_message }
    end
  end

  def handle_message
    return unless %w[lid user].include?(jid_type)
    return unless extract_from_jid(type: 'lid')
    return if ignore_message?
    return if find_message_by_source_id(raw_message_id) || message_under_process?

    cache_message_source_id_in_redis
    set_contact

    unless @contact
      clear_message_source_id_from_redis

      Rails.logger.warn "Contact not found for message: #{raw_message_id}"
      return
    end

    set_conversation
    handle_create_message
    clear_message_source_id_from_redis
  end

  def set_contact
    phone = extract_from_jid(type: 'pn')
    source_id = extract_from_jid(type: 'lid')
    identifier = "#{source_id}@lid"

    update_existing_contact_inbox(phone, source_id, identifier) if phone

    contact_inbox = ::ContactInboxWithContactBuilder.new(
      source_id: source_id,
      inbox: inbox,
      contact_attributes: { name: contact_name, phone_number: ("+#{phone}" if phone), identifier: identifier }
    ).perform

    @contact_inbox = contact_inbox
    @contact = contact_inbox.contact

    update_contact_info(phone, source_id, identifier)
  end

  def update_existing_contact_inbox(phone, source_id, identifier)
    # NOTE: This is useful when we create a new contact manually, so we don't have information about contact LID;
    # With this, when we receive a message from that contact, we can link it properly.
    existing_contact_inbox = inbox.contact_inboxes.find_by(source_id: phone)
    return unless existing_contact_inbox
    return if inbox.contact_inboxes.exists?(source_id: source_id)

    existing_contact = existing_contact_inbox.contact
    conflicting_identifier = inbox.account.contacts.find_by(identifier: identifier)
    conflicting_phone = inbox.account.contacts.find_by(phone_number: "+#{phone}")

    return if conflicting_identifier && conflicting_identifier.id != existing_contact.id
    return if conflicting_phone && conflicting_phone.id != existing_contact.id

    ActiveRecord::Base.transaction do
      existing_contact_inbox.update!(source_id: source_id)
      existing_contact.update!(identifier: identifier, phone_number: "+#{phone}")
    end
  end

  def update_contact_info(phone, source_id, identifier)
    update_params = {}
    update_params[:phone_number] = "+#{phone}" if phone
    update_params[:identifier] = identifier
    update_params[:name] = contact_name if @contact.name.in?([phone, source_id, identifier])

    @contact.update!(update_params) if update_params.present?
    try_update_contact_avatar
  end

  def handle_create_message
    create_message(attach_media: %w[image file video audio sticker].include?(message_type))
  end

  def create_message(attach_media: false)
    @message = @conversation.messages.build(
      content: message_content,
      account_id: @inbox.account_id,
      inbox_id: @inbox.id,
      source_id: raw_message_id,
      sender: incoming? ? @contact : @inbox.account.account_users.first.user,
      sender_type: incoming? ? 'Contact' : 'User',
      message_type: incoming? ? :incoming : :outgoing,
      content_attributes: message_content_attributes
    )

    handle_attach_media if attach_media

    @message.save!

    inbox.channel.received_messages([@message], @conversation) if incoming?
  end

  def message_content_attributes
    type = message_type
    msg = unwrap_ephemeral_message(@raw_message[:message])
    content_attributes = { external_created_at: baileys_extract_message_timestamp(@raw_message[:messageTimestamp]) }
    if type == 'reaction'
      content_attributes[:in_reply_to_external_id] = msg.dig(:reactionMessage, :key, :id)
      content_attributes[:is_reaction] = true
    elsif reply_to_message_id
      content_attributes[:in_reply_to_external_id] = reply_to_message_id
    elsif type == 'unsupported'
      content_attributes[:is_unsupported] = true
    end

    content_attributes
  end

  def handle_attach_media
    attachment_file = download_attachment_file
    msg = unwrap_ephemeral_message(@raw_message[:message])

    attachment = @message.attachments.build(
      account_id: @message.account_id,
      file_type: file_content_type.to_s,
      file: { io: attachment_file, filename: filename, content_type: message_mimetype }
    )
    attachment.meta = { is_recorded_audio: true } if msg.dig(:audioMessage, :ptt)
  rescue Down::Error => e
    @message.update!(is_unsupported: true)

    Rails.logger.error "Failed to download attachment for message #{raw_message_id}: #{e.message}"
  end

  def download_attachment_file
    Down.download(@conversation.inbox.channel.media_url(@raw_message.dig(:key, :id)), headers: @conversation.inbox.channel.api_headers)
  end

  def filename
    msg = unwrap_ephemeral_message(@raw_message[:message])
    filename = msg.dig(:documentMessage, :fileName) || msg.dig(:documentWithCaptionMessage, :message, :documentMessage, :fileName)
    return filename if filename.present?

    ext = ".#{message_mimetype.split(';').first.split('/').last}" if message_mimetype.present?
    "#{file_content_type}_#{raw_message_id}_#{Time.current.strftime('%Y%m%d')}#{ext}"
  end
end