#!/usr/bin/env ruby

require 'thor'
require 'digest/md5'
require 'parallel'

require_relative '../lib/svggvs'

module SVGGVS
  class Cli < Thor
    include Thor::Actions

    def self.source_root
      ::File.expand_path('../../skel', __FILE__)
    end

    class_option :cardfile, default: 'Cardfile'

    desc "install [ dir ]", "Install a Cardfile and sample template"
    def install(dir = '.')
      directory '.', dir
    end

    desc "merged_file", "Write out a merged file"
    def merged_file
      context.write_merged_file
    end

    desc "svgs", "Write out individual SVG files"
    def svgs
      write_svgs
    end

    desc "pngs", "Write out individual PNG files"
    def pngs
      write_svgs
      ensure_tmp

      @exported_pngs = Parallel.map(context.individual_files.each_with_index) do |svg_file, index|
        target = Pathname(context.session.png_files_path % index)
        target.parent.mkpath

        system %{inkscape --export-area-page --export-png "#{target.expand_path}" --export-width #{context.session.png_export_width} --export-background="#ffffffff" "#{svg_file.expand_path}"}

        target
      end
    end

    CARDS_PER_PAGE = 9

    desc "pdf", "Create PDF of card images"
    def pdf
      pngs

      trimmed_pngs = Parallel.map(@exported_pngs) do |png|
        tmp_target = tmp_target_for(png)

        system %{convert #{png} -gravity Center -crop #{context.session.pdf_card_size}+0+0 +repage #{tmp_target}}

        tmp_target
      end

      png_slices = trimmed_pngs.each_slice(CARDS_PER_PAGE)

      page_count = trimmed_pngs.length / CARDS_PER_PAGE

      placeholder = tmp_target_for("placeholder.png")
      system %{convert -size #{context.session.pdf_card_size} xc:white #{placeholder}}

      pdf_obj = SVGGVS::PDF.new(card_size: context.session.pdf_card_size)

      pages = Parallel.map(png_slices.each_with_index) do |files, page_index|
        tmp_pdf_png_target = tmp_path.join("page%05d.pdf" % page_index)
        tmp_pdf_target = tmp_path.join("page%05d.pdf" % page_index)

        files += Array.new(9 - files.length, placeholder)

        system %{montage -density #{context.session.pdf_dpi} -geometry +0+0 #{files.join(' ')} #{tmp_pdf_png_target}}
        system %{convert -density #{context.session.pdf_dpi} #{tmp_pdf_png_target} -bordercolor white -border #{SVGGVS::PDF.border_size} #{pdf_obj.generate_crop_mark_draws.join(' ')} #{tmp_pdf_target}}.tap { |o| p o }

        tmp_pdf_target
      end

      if context.session.card_back
        tmp_target = tmp_target_for(context.session.card_back)
        tmp_pdf_target = tmp_path.join("backs.pdf")

        system %{convert #{context.session.card_back} -gravity Center -crop #{context.session.pdf_card_size}+0+0 +repage #{tmp_target}}
        system %{montage -density #{context.session.pdf_dpi} -geometry +0+0 #{Array.new(9, tmp_target).join(' ')} #{tmp_pdf_target}}

        pages.length.times do |page|
          pages << tmp_pdf_target
        end
      end

      Pathname(context.session.pdf_target).parent.mkpath

      system "gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=#{context.session.pdf_target} -dBATCH #{pages.join(" ")}"
    end

    no_tasks do
      def tmp_target_for(file)
        tmp_path.join(Digest::MD5.hexdigest(file.to_s) + '.png')
      end

      def tmp_path
        @tmp_path ||= Pathname(".tmp")
      end

      def ensure_tmp
        tmp_path.rmtree if tmp_path.directory?
        tmp_path.mkpath
      end

      def context
        @context ||= SVGGVS::Context.load(options[:cardfile])
      end

      def write_svgs
        context.write_individual_files
      end
    end
  end
end

SVGGVS::Cli.start