# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at https://mozilla.org/MPL/2.0/.

require 'pathname'
require 'open3'
require 'rake/clean'
require_relative 'tools/support'

# Dependencies.
GCC_VERSION = "15.1.0"

# Paths.
HOST_GCC = TMP + 'host/gcc'
HOST_INSTALL = TMP + 'host/install'

CLOBBER.include TMP

directory(TMP + 'tools')
directory HOST_GCC
directory HOST_INSTALL

task default: [TMP + 'elna'] do
  sh (TMP + 'elna').to_path, '--parse', 'source.elna'
end

namespace :boot do
  desc 'Download and configure the bootstrap compiler'
  task configure: [TMP + 'tools', HOST_GCC, HOST_INSTALL] do
    url = URI.parse "https://gcc.gnu.org/pub/gcc/releases/gcc-#{GCC_VERSION}/gcc-#{GCC_VERSION}.tar.xz"
    options = find_build_target GCC_VERSION
    source_directory = TMP + "tools/gcc-#{GCC_VERSION}"
    frontend_link = source_directory + 'gcc'

    download_and_pipe url, source_directory.dirname, ['tar', '-Jxv']

    sh 'contrib/download_prerequisites', chdir: source_directory.to_path
    File.symlink Pathname.new('.').relative_path_from(frontend_link), (frontend_link + 'elna')

    configure_options = [
      "--prefix=#{HOST_INSTALL.realpath}",
      "--with-sysroot=#{options.sysroot.realpath}",
      '--enable-languages=c,c++,elna',
      '--disable-bootstrap',
      '--disable-multilib',
      "--target=#{options.build}",
      "--build=#{options.build}",
      "--host=#{options.build}"
    ]
    flags = '-O0 -g -fPIC -I/opt/homebrew/Cellar/flex/2.6.4_2/include'
    env = {
      'CC' => options.gcc,
      'CXX' => options.gxx,
      'CFLAGS' => flags,
      'CXXFLAGS' => flags,
    }
    configure = source_directory.relative_path_from(HOST_GCC) + 'configure'
    sh env, configure.to_path, *configure_options, chdir: HOST_GCC.to_path
  end

  desc 'Make and install the bootstrap compiler'
  task :make do
    cwd = HOST_GCC.to_path

    sh 'make', '-j', Etc.nprocessors.to_s, chdir: cwd
    sh 'make', 'install', chdir: cwd
  end
end

desc 'Build the bootstrap compiler'
task boot: %w[boot:configure boot:make]

file (TMP + 'elna').to_path => ['source.elna']
file (TMP + 'elna').to_path => [(HOST_INSTALL + 'bin/gelna').to_path] do |task|
  sh (HOST_INSTALL + 'bin/gelna').to_path, '-o', task.name, task.prerequisites.first
end