path: root/app/controllers/pdfresources_controller.rb

class PdfresourcesController < ApplicationController
  before_action :set_pdfresource, only: %i[ show edit update destroy ]
  before_action :require_admin, only: %i[ new create update destroy ]

  # GET /pdfresources or /pdfresources.json
  def index
    @pdfresources = Pdfresource.all
  end

  # GET /pdfresources/1 or /pdfresources/1.json
  def show
  end

  # GET /pdfresources/new
  def new
    @pdfresource = Pdfresource.new
  end

  # GET /pdfresources/1/edit
  def edit
  end

  # POST /pdfresources or /pdfresources.json
  def create
    @pdfresource = Pdfresource.new(pdfresource_params)

    respond_to do |format|
      if @pdfresource.save
        process_pdfs(@pdfresource.pdfs)
        format.html { redirect_to @pdfresource, notice: "Resource was successfully created." }
        format.json { render :show, status: :created, location: @pdfresource }
      else
        format.html { render :new, status: :unprocessable_entity }
        format.json { render json: @pdfresource.errors, status: :unprocessable_entity }
      end
    end
  end

  def process_pdfs(pdfs)
    pdfs.each do |pdf|
      pdf_path = ActiveStorage::Blob.service.send(:path_for, pdf.key)
      convert_pdf_to_images(pdf_path, @pdfresource)
    end
  end

  def convert_pdf_to_images(pdf_path, resource)
    page_count_output = MiniMagick::Tool::Identify.new do |identify|
      identify.format '%n'
      identify << pdf_path
    end

    page_count = page_count_output.size

    page_count.times do |index|
      image_path = "page-#{index + 1}.jpg"
      reduced_image_path = "reduced-page-#{index + 1}.jpg"
      MiniMagick::Tool::Magick.new do |magick|
        magick << "#{pdf_path}[#{index}]" # Process each PDF page individually
        magick << image_path
      end

      image_reduced = MiniMagick::Tool::Magick.new do |magick|
        magick << image_path
        magick << "-quality"
        magick << "40"
        magick.strip
        magick << "-resize"
        magick << "50%"
        magick << reduced_image_path
      end

      if File.exist?(reduced_image_path)
        fn = resource.name.strip.downcase.gsub("\s", "_") << "_page-"
        image_blob = ActiveStorage::Blob.create_and_upload!(
          io: File.open(reduced_image_path),
          filename: "#{fn}#{index + 1}.jpg",
          content_type: 'image/jpg'
        )
        resource.pdf_snapshots.attach(image_blob)

        File.delete(image_path) if File.exist?(image_path)
        File.delete(reduced_image_path) if File.exist?(reduced_image_path)
      else
        raise "Reduced image file wasn't created successfully: #{image_reduced}"
      end
    end
  end

  # PATCH/PUT /pdfresources/1 or /pdfresources/1.json
  def update
    respond_to do |format|
      if @pdfresource.update(pdfresource_params)
        format.html { redirect_to @pdfresource, notice: "Pdfresource was successfully updated." }
        format.json { render :show, status: :ok, location: @pdfresource }
      else
        format.html { render :edit, status: :unprocessable_entity }
        format.json { render json: @pdfresource.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /pdfresources/1 or /pdfresources/1.json
  def destroy
    @pdfresource.destroy!

    respond_to do |format|
      format.html { redirect_to pdfresources_path, status: :see_other, notice: "Pdfresource was successfully destroyed." }
      format.json { head :no_content }
    end
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_pdfresource
    @pdfresource = Pdfresource.find(params.expect(:id))
  end

  # Only allow a list of trusted parameters through.
  def pdfresource_params
    params.expect(pdfresource: [:name, :stripe_product_id, :price, :age_range, :curriculum, :feature_slot, :description, :card_description, pdfs: [], thumbnails: []])
  end

  # must be admin!
  def require_admin
    unless Current.session.user&.is_admin
      redirect_to root_path, notice: "You must be an admin to perform this action."
    end
  end
end