require 'pathname'
require 'rake/clean'
require 'open3'

DFLAGS = ['--warn-no-deprecated', '-L/usr/lib64/gcc-12']
BINARY = 'build/bin/elna'
TESTS = FileList['tests/*.elna']
  .map { |test| (Pathname.new('build') + test).sub_ext('').to_path }
SOURCES = FileList['source/**/*.d']

directory 'build'

CLEAN.include 'build'
CLEAN.include '.dub'

rule(/build\/tests\/.+/ => ->(file) { test_for_out(file) }) do |t|
  Pathname.new(t.name).dirname.mkpath
  sh BINARY, t.source
  sh 'gcc', '-o', t.name, "#{t.name}.o"
  # Open3.pipeline [BINARY, t.source], ['gcc', '-x', 'assembler', '-o', t.name,  '-']
end

file BINARY => SOURCES do |t|
  sh({ 'DFLAGS' => (DFLAGS * ' ') }, 'dub', 'build', '--compiler=gdc-12')
end

file 'build/tests/sample' => BINARY do |t|
  sh t.source
  sh 'gcc', '-o', t.name, 'build/tests/sample.o'
end

task default: BINARY

desc 'Run all tests and check the results'
task test: TESTS
task test: BINARY do
  TESTS.each do |test|
    expected = Pathname
      .new(test)
      .sub_ext('.txt')
      .sub(/^build\/tests\//, 'tests/expectations/')
      .read
      .to_i

    puts "Running #{test}"
    system test
    actual = $?.exitstatus

    fail "#{test}: Expected #{expected}, got #{actual}" unless expected == actual
  end

  # system './build/tests/sample'
  # actual = $?.exitstatus
  # fail "./build/tests/sample: Expected 3, got #{actual}" unless 3 == actual
end

desc 'Run unittest blocks'
task unittest: SOURCES do |t|
  sh('dub', 'test', '--compiler=gdc-12')
end

def test_for_out(out_file)
  test_source = Pathname
    .new(out_file)
    .sub_ext('.elna')
    .sub(/^build\//, '')
    .to_path
  [test_source, BINARY]
end