module Whatsapp::Providers
  class WuzapiService < BaseService
    attr_reader :whatsapp_channel

    def initialize(whatsapp_channel:)
      @whatsapp_channel = whatsapp_channel
      @base_url = whatsapp_channel.provider_config['wuzapi_base_url']
    end

    def send_message(phone_number, message)
      user_token = whatsapp_channel.wuzapi_user_token
      # Normalize phone number: remove +, space, -, (, )
      normalized_phone = phone_number.gsub(/[\+\s\-\(\)]/, '')
      
      if message.attachments.present?
        send_attachment_message(user_token, normalized_phone, message)
      else
        client.send_text(user_token, normalized_phone, message.content)
      end
    end

    def send_attachment_message(user_token, phone_number, message)
      attachment = message.attachments.first
      base64_data = Base64.strict_encode64(attachment.file.download)
      mime_type = attachment.file.content_type
      data_uri = "data:#{mime_type};base64,#{base64_data}"

      if mime_type.start_with?('image/')
        client.send_image(user_token, phone_number, data_uri, message.content)
      else
        client.send_file(user_token, phone_number, data_uri, attachment.file.filename.to_s)
      end
    end

    def send_template(phone_number, template_info)
      # Placeholder for template support if Wuzapi supports it.
      # For now, just logging or no-op as per initial text-focused plan.
      Rails.logger.warn "Wuzapi: Templates not yet implemented or supported."
    end

    def sync_templates
      # No-op for Wuzapi as it doesn't insist on syncing templates like Cloud API
    end

    def validate_provider_config?
      # Validate if we can connect to session status
      user_token = whatsapp_channel.wuzapi_user_token
      return false if user_token.blank?

      begin
        client.session_status(user_token)
        true
      rescue Wuzapi::Client::Error
        false
      end
    end

    private

    def client
      @client ||= ::Wuzapi::Client.new(@base_url)
    end
  end
end