# frozen_string_literal: true

require 'minitest/autorun'
require 'open3'
require 'tmpdir'
require 'fileutils'

ROOT = File.expand_path('..', __dir__)
BIN = File.join(ROOT, 'bin')
DEMO = File.join(ROOT, 'demo')

# Each test runs in a scratch copy of demo/, so commands that change files
# (append, delete, replace ...) never touch the originals.
class RdbCase < Minitest::Test
  # Tests spawn their own processes in their own directory, so they can run
  # side by side (N=1 in MT_CPU runs them one at a time).
  parallelize_me!

  def setup
    @dir = Dir.mktmpdir('rdb-test')
    FileUtils.cp_r(Dir[File.join(DEMO, '*')], @dir)
  end

  def teardown
    FileUtils.remove_entry(@dir)
  end

  # Run a command through its symlink; returns [stdout, stderr, status].
  def run3(cmd, *args, stdin: '', env: {})
    Open3.capture3({ 'PATH' => "#{BIN}:#{ENV['PATH']}" }.merge(env), File.join(BIN, cmd), *args,
                   stdin_data: stdin, chdir: @dir)
  end

  def rdb(cmd, *args, stdin: nil, file: nil)
    stdin = File.read(File.join(@dir, file)) if file
    out, err, st = run3(cmd, *args, stdin: stdin.to_s)
    assert st.success?, "#{cmd} #{args.join(' ')} failed: #{err}"
    out
  end

  # Output as rows of cells, without the head and dash lines.
  def data(out)
    out.lines.drop(2).map { |l| l.chomp.split("\t", -1) }
  end

  def read(name)
    File.read(File.join(@dir, name))
  end

  def write(name, text)
    File.write(File.join(@dir, name), text)
  end
end