Class: Assistant::GammaToolBuilder::ReadTool

Inherits:

RubyLLM::Tool

• Object
• RubyLLM::Tool
• Assistant::GammaToolBuilder::ReadTool

Includes:

GammaIdExtractable

Defined in:

app/services/assistant/gamma_tool_builder.rb

Overview

Read and analyse the content of an existing Gamma presentation or document.

Instance Method Summary

• #execute(gamma_url:, **_) ⇒ Object
• #name ⇒ Object

Instance Method Details

#execute(gamma_url:, **_) ⇒ Object

# File 'app/services/assistant/gamma_tool_builder.rb', line 329

def execute(gamma_url:, **_)
  require 'pdf/reader'

  temp_path = nil
  gamma_id  = extract_gamma_id(gamma_url)
  full_url  = canonical_gamma_url(gamma_url)

  if gamma_id.blank? || gamma_id !~ /\A[a-z0-9]+\z/
    return {
      success: false,
      error:   "Could not extract a valid gammaId from '#{gamma_url}'. " \
               'Please provide the full Gamma URL (e.g. https://gamma.app/docs/my-deck-abc123).'
    }.to_json
  end

  content = nil
  method  = nil

  # ── Level 1: Gamma API PDF export (works for Sunny-created or template gammas) ──
  Rails.logger.info("[GammaToolBuilder] gamma_read: trying Gamma API for #{gamma_id}")
  client     = GammaClient.new
  pdf_result = client.fetch_pdf_url(gamma_id: gamma_id)

  if pdf_result.success? && pdf_result.data[:pdf_url].present?
    pdf_url   = pdf_result.data[:pdf_url]
    temp_path = Rails.application.config.x.temp_storage_path
                     .join("gamma_read_#{gamma_id}_#{Time.current.to_i}.pdf")

    Down::Http.download(pdf_url, destination: temp_path) { |http_client| http_client.timeout(read: 60) }

    text_parts = []
    PDF::Reader.open(temp_path.to_s) do |reader|
      reader.pages.each_with_index do |page, idx|
        page_text = page.text.to_s.strip
        text_parts << "## Slide #{idx + 1}\n#{page_text}" if page_text.present?
      end
    end

    if text_parts.any?
      content = text_parts.join("\n\n")
      method  = 'gamma_api_pdf'
      Rails.logger.info("[GammaToolBuilder] gamma_read: Level 1 (Gamma API) succeeded")
    end
  end

  # ── Level 2: Oxylabs headless-browser scrape ──────────────────────────────────
  if content.nil?
    Rails.logger.info("[GammaToolBuilder] gamma_read: escalating to Oxylabs scrape for #{full_url}")
    scraped = scrape_gamma_page(full_url)

    if scraped.present?
      content = scraped
      method  = 'oxylabs_scrape'
      Rails.logger.info("[GammaToolBuilder] gamma_read: Level 2 (Oxylabs) succeeded, #{content.length} chars")
    end
  end

  if content.nil?
    return {
      success: false,
      error:   'Could not retrieve presentation content. Gamma.app is protected by ' \
               'Cloudflare, which blocks automated rendering for this presentation right now — ' \
               'this usually clears up within minutes. ' \
               'Alternatively, export the PDF from Gamma (Share → Export → PDF) and upload it here, ' \
               'or paste the slide text directly into the chat.'
    }.to_json
  end

  # Truncate to ~25 000 chars to stay within context limits
  truncated = content.length > 25_000
  content   = content[0, 25_000] if truncated

  result = {
    success:          true,
    gamma_id:         gamma_id,
    retrieval_method: method,
    content:          content
  }
  result[:truncated] = true if truncated

  result.to_json
rescue PDF::Reader::MalformedPDFError, PDF::Reader::UnsupportedFeatureError => e
  Rails.logger.error("[GammaToolBuilder] gamma_read PDF parse error: #{e.message}")
  { success: false, error: "PDF could not be parsed: #{e.message}" }.to_json
rescue StandardError => e
  Rails.logger.error("[GammaToolBuilder] gamma_read failed: #{e.class} #{e.message}")
  { success: false, error: "Failed to read Gamma presentation: #{e.message}" }.to_json
ensure
  File.delete(temp_path) if temp_path && File.exist?(temp_path.to_s)
end

#name ⇒ Object

# File 'app/services/assistant/gamma_tool_builder.rb', line 327

def name = 'gamma_read'