# == Schema Information
#
# Table name: channel_whatsapp
#
#  id                             :bigint           not null, primary key
#  message_templates              :jsonb
#  message_templates_last_updated :datetime
#  phone_number                   :string           not null
#  provider                       :string           default("default")
#  provider_config                :jsonb
#  created_at                     :datetime         not null
#  updated_at                     :datetime         not null
#  account_id                     :integer          not null
#
# Indexes
#
#  index_channel_whatsapp_on_phone_number  (phone_number) UNIQUE
#

class Channel::Whatsapp < ApplicationRecord
  include Channelable

  self.table_name = 'channel_whatsapp'
  EDITABLE_ATTRS = [:phone_number, { provider_config: {} }].freeze

  validates :phone_number, presence: true, uniqueness: true
  before_save :validate_provider_config

  def name
    'Whatsapp'
  end

  # all this should happen in provider service . but hack mode on
  def api_base_path
    # provide the environment variable when testing against sandbox : 'https://waba-sandbox.360dialog.io/v1'
    ENV.fetch('360DIALOG_BASE_URL', 'https://waba.360dialog.io/v1')
  end

  # Extract later into provider Service
  def send_message(phone_number, message)
    if message.attachments.present?
      send_attachment_message(phone_number, message)
    else
      send_text_message(phone_number, message)
    end
  end

  def send_template(phone_number, template_info)
    send_template_message(phone_number, template_info)
  end

  def media_url(media_id)
    "#{api_base_path}/media/#{media_id}"
  end

  def api_headers
    { 'D360-API-KEY' => provider_config['api_key'], 'Content-Type' => 'application/json' }
  end

  def has_24_hour_messaging_window?
    true
  end

  def message_templates
    sync_templates
    super
  end

  private

  def send_text_message(phone_number, message)
    response = HTTParty.post(
      "#{api_base_path}/messages",
      headers: api_headers,
      body: {
        to: phone_number,
        text: { body: message.content },
        type: 'text'
      }.to_json
    )

    response.success? ? response['messages'].first['id'] : nil
  end

  def send_attachment_message(phone_number, message)
    attachment = message.attachments.first
    type = %w[image audio video].include?(attachment.file_type) ? attachment.file_type : 'document'
    attachment_url = attachment.file_url
    response = HTTParty.post(
      "#{api_base_path}/messages",
      headers: api_headers,
      body: {
        'to' => phone_number,
        'type' => type,
        type.to_s => {
          'link': attachment_url,
          'caption': message.content
        }
      }.to_json
    )

    response.success? ? response['messages'].first['id'] : nil
  end

  def send_template_message(phone_number, template_info)
    response = HTTParty.post(
      "#{api_base_path}/messages",
      headers: api_headers,
      body: {
        to: phone_number,
        template: template_body_parameters(template_info),
        type: 'template'
      }.to_json
    )

    response.success? ? response['messages'].first['id'] : nil
  end

  def template_body_parameters(template_info)
    {
      name: template_info[:name],
      namespace: template_info[:namespace],
      language: {
        policy: 'deterministic',
        code: template_info[:lang_code]
      },
      components: [{
        type: 'body',
        parameters: template_info[:parameters]
      }]
    }
  end

  def sync_templates
    # to prevent too many api calls
    last_updated = message_templates_last_updated || 1.day.ago
    return if Time.current < (last_updated + 12.hours)

    response = HTTParty.get("#{api_base_path}/configs/templates", headers: api_headers)
    update(message_templates: response['waba_templates'], message_templates_last_updated: Time.now.utc) if response.success?
  end

  # Extract later into provider Service
  def validate_provider_config
    response = HTTParty.post(
      "#{api_base_path}/configs/webhook",
      headers: { 'D360-API-KEY': provider_config['api_key'], 'Content-Type': 'application/json' },
      body: {
        url: "#{ENV['FRONTEND_URL']}/webhooks/whatsapp/#{phone_number}"
      }.to_json
    )
    errors.add(:bot_token, 'error setting up the webook') unless response.success?
  end
end
