require "rails_helper"

RSpec.describe Admin::HostMetrics do
  subject(:metrics) { described_class.new }

  describe "#build_disk_usage" do
    it "costruisce la struttura disco" do
      result = metrics.send(:build_disk_usage, "/", total: 115_964_116_992, used: 9_388_032_000, free: 106_576_084_992, used_percent: 9.0)

      expect(result[:path]).to eq("/")
      expect(result[:total_bytes]).to eq(115_964_116_992)
      expect(result[:used_bytes]).to eq(9_388_032_000)
      expect(result[:free_bytes]).to eq(106_576_084_992)
      expect(result[:used_percent]).to eq(9.0)
    end
  end

  describe "#disk_usage_for" do
    it "usa df quando statvfs non è disponibile" do
      allow(File).to receive(:respond_to?).and_call_original
      allow(File).to receive(:respond_to?).with(:statvfs).and_return(false)
      allow(Dir).to receive(:exist?).with("/recordings").and_return(true)
      allow(metrics).to receive(:disk_usage_via_statvfs).with("/recordings").and_return(nil)
      allow(metrics).to receive(:disk_usage_via_df).with("/recordings").and_return(
        path: "/recordings",
        total_bytes: 100_000,
        used_bytes: 9_000,
        free_bytes: 91_000,
        used_percent: 9.0
      )
      allow(metrics).to receive(:shell_out).with(/du -sb/).and_return("1048576\t/recordings\n")

      result = metrics.send(:disk_usage_for, "/recordings")

      expect(result[:total_bytes]).to eq(100_000)
      expect(result[:dir_size_bytes]).to eq(1_048_576)
    end
  end
end