module Pdfs2Pdf
  class CLI < Thor
    # rubocop:disable AmbiguousOperator
    desc "merge", "Combine multiple pdfs into one file with combined table of content"
    method_option *AgileUtils::Options::BASE_DIR
    method_option *AgileUtils::Options::RECURSIVE
    method_option *AgileUtils::Options::VERSION
    def merge
      opts = options.deep_symbolize_keys
      if opts[:version]
        puts "You are using Pdfs2Pdf version #{Pdfs2Pdf::VERSION}"
        exit
      end
      base_dir  = File.expand_path(opts[:base_dir])
      pdf_files = CodeLister.files base_dir:  base_dir,
                                   exts:      %w[pdf],
                                   recursive: opts[:recursive]
      # Note: we remove the output file from the list of file here first if any
      output_file = "pdfs2pdf_#{File.basename(File.expand_path(base_dir))}.pdf"
      pdf_files.delete_if { |file| file == "./#{output_file}" }

      # We make sure that the index.html.pdf is the first element in the list if applicable
      index_file = pdf_files.delete("./index.html.pdf")
      pdf_files.unshift(index_file) if index_file
      create_pdfmarks(pdf_files, base_dir)
      merge_pdfs(pdf_files, output_file)
    end
    # rubocop:enable All

    desc "usage", "Display usage information"
    def usage
      puts <<-EOT
Usage:

  pdfs2pdf

Options:
  -b, [--base-dir=BASE_DIR]            # Base directory
                                       # Default: . (current directory)
  -r, [--recursive], [--no-recursive]  # Search for files recursively
                                       # Default: --recursive
  -v, [--version], [--no-version]      # Display version information

Combine multiple pdfs into one file with combined table of content

      EOT
    end

    default_task :usage

    private

    def create_pdfmarks(page_list, base_dir)
      elapsed = AgileUtils::FileUtil.time do
        Pdfs2Pdf.create_pdfmarks(page_list, "pdfmarks", base_dir)
      end
      puts "Create pdfmarks took #{elapsed} ms"
    end

    def merge_pdfs(pdf_files, output_file)
      elapsed = AgileUtils::FileUtil.time do
        Pdfs2Pdf.merge_pdfs(pdf_files, "pdfmarks", output_file)
      end
      puts "Combine pdf files took #{elapsed} ms"
      puts "Your combined pdf is available at #{File.absolute_path(output_file)}"
    end
  end
end