# frozen_string_literal: true

module Mutations
  class CreateDirectUpload < GraphQL::Schema::Mutation
    class CreateDirectUploadInput < GraphQL::Schema::InputObject
      description "File information required to prepare a direct upload"
      argument :filename, String, "Original file name", required: true
      argument :byte_size, Int, "File size (bytes)", required: true
      argument :checksum, String, "MD5 file checksum as base64", required: true
      argument :content_type, String, "File content type", required: true
    end

    argument :input, CreateDirectUploadInput, required: true

    class DirectUpload < GraphQL::Schema::Object
      description "Represents direct upload credentials"

      field :url, String, "Upload URL", null: false
      field :service_url, String, "Service URL", null: false
      field :headers, String,
            "HTTP request headers (JSON-encoded)",
            null: false
      field :blob_id, ID, "Created blob record ID", null: false
      field :signed_blob_id, ID,
            "Created blob record signed ID",
            null: false
    end

    field :direct_upload, DirectUpload, null: false

    def resolve(input:)
      blob = ActiveStorage::Blob.create_before_direct_upload!(input.to_h)
      {
        direct_upload: {
          url: blob.service_url_for_direct_upload,
          service_url: Rails.application.routes.url_helpers.rails_blob_path(blob),
          # NOTE: we pass headers as JSON since they have no schema
          headers: blob.service_headers_for_direct_upload.to_json,
          blob_id: blob.id,
          signed_blob_id: blob.signed_id
        }
      }
    end
  end
end
