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require 'fileutils'

config_root = File.expand_path('.')
config_core = File.expand_path("#{config_root}/core")

config_build_config = File.expand_path("#{config_root}/core/mruby_build.rb")
config_build_config_fast = File.expand_path("#{config_root}/core/mruby_build_host.rb")

config_build_raylib_source = File.expand_path("#{config_root}/core/raylib/src")

config_mruby = File.expand_path("#{config_root}/core/mruby")
config_include_mruby = File.expand_path("#{config_mruby}/include")

config_vendor = File.expand_path("#{config_root}/vendor")

config_tux = File.expand_path("#{config_vendor}/tux")
config_tux_include = File.expand_path("#{config_vendor}/tux/include")
config_tux_lib = File.expand_path("#{config_vendor}/tux/lib")

config_web = File.expand_path("#{config_vendor}/web")
config_web_include = File.expand_path("#{config_vendor}/web/include")
config_web_lib = File.expand_path("#{config_vendor}/web/lib")

config_win = File.expand_path("#{config_vendor}/win")
config_win_include = File.expand_path("#{config_vendor}/win/include")
config_win_lib = File.expand_path("#{config_vendor}/win/lib")

config_build = File.expand_path("#{config_root}/build")
config_build_temp = File.expand_path("#{config_build}/temp")
config_build_tux = File.expand_path("#{config_build}/tux")
config_build_web = File.expand_path("#{config_build}/web")
config_build_win = File.expand_path("#{config_build}/win")

config_game = File.expand_path("#{config_root}/game")

namespace :build do

  desc "Build the engine"
  task :mruby do
    Dir.chdir("core/mruby") do
      Dir.mkdir(config_vendor) unless File.exists?(config_vendor)
      system("env MRUBY_CONFIG=#{config_build_config} rake")
      FileUtils.cp("build/web/lib/libmruby.a", "#{config_web_lib}/")
      FileUtils.cp("build/host/lib/libmruby.a", "#{config_tux_lib}/")
      FileUtils.cp("build/win/lib/libmruby.a", "#{config_win_lib}/")
    end
  end

  desc "Build the engine only for Linux"
  task :mruby_fast do
    Dir.chdir("core/mruby") do
      Dir.mkdir(config_vendor) unless File.exists?(config_vendor)
      system("env MRUBY_CONFIG=#{config_build_config_fast} rake")
      FileUtils.cp("build/host/lib/libmruby.a", "#{config_tux_lib}/")
    end
  end

  desc "Build Raylib"
  task :raylib do
    Dir.mkdir(config_vendor) unless File.exists?(config_vendor)
    Dir.mkdir(config_tux) unless File.exists?(config_tux)
    Dir.mkdir("#{config_tux_lib}") unless File.exists?("#{config_tux_lib}")
    Dir.mkdir("#{config_tux_include}") unless File.exists?("#{config_tux_include}")
    Dir.mkdir(config_web) unless File.exists?(config_web)
    Dir.mkdir("#{config_web_lib}") unless File.exists?("#{config_web_lib}")
    Dir.mkdir("#{config_web_include}") unless File.exists?("#{config_web_include}")
    Dir.mkdir(config_win) unless File.exists?(config_win)
    Dir.mkdir("#{config_win_lib}") unless File.exists?("#{config_win_lib}")
    Dir.mkdir("#{config_win_include}") unless File.exists?("#{config_win_include}")
      #puts 'installing, this should prompt you to enter password unless you are already in sudo'
    Dir.chdir(config_build_raylib_source) do
      `make clean`
      puts 'building for tux...'
      `make PLATFORM=PLATFORM_DESKTOP`
      FileUtils.cp("raylib.h", "#{config_tux_include}/")
      FileUtils.cp("raymath.h", "#{config_tux_include}/")
      FileUtils.cp("rlgl.h", "#{config_tux_include}/")
      # copy libraylib.a to  lib
      FileUtils.cp("libraylib.a", "#{config_tux_lib}/")
      `make clean`
      puts 'building for web...'
      `make PLATFORM=PLATFORM_WEB -e`
      FileUtils.cp("raylib.h", "#{config_web_include}/")
      FileUtils.cp("raymath.h", "#{config_web_include}/")
      FileUtils.cp("rlgl.h", "#{config_web_include}/")
      FileUtils.cp("libraylib.a", "#{config_web_lib}/")
      `make clean`
      `zig build -Dtarget=x86_64-windows-gnu`
      FileUtils.cp("raylib.h", "#{config_win_include}/")
      FileUtils.cp("raymath.h", "#{config_win_include}/")
      FileUtils.cp("rlgl.h", "#{config_win_include}/")
      FileUtils.cp("zig-out/lib/raylib.lib", "#{config_win_lib}/")
    end
  end
  #desc 'Export to single file'
  task :single_file do
    result = ''
    main = File.read("#{config_game}/main.rb")
    tmp = main.lines(chomp: true).select do |line|
      line.include? 'require '
    end
    tmp.each do |file|
      file.delete_prefix!('require ')
      result += "#{File.read("#{config_game}/#{file[1, file.length - 2]}")}\n"
    end

    result += main.lines.reject do |line|
      line.include? 'require '
    end.join

    Dir.mkdir(config_build) unless File.exists?(config_build)
    Dir.mkdir(config_build_temp) unless File.exists?(config_build_temp)
    File.write("#{config_build_temp}/main.rb", result)
  end
  #desc 'Compile the game to bytecode'
  task :bytecode => :single_file do
    Dir.mkdir(config_build) unless File.exists?(config_build)
    Dir.mkdir(config_build_temp) unless File.exists?(config_build_temp)
    Dir.chdir(config_build_temp) do
      system("#{config_mruby}/bin/mrbc -Bbytecode -obytecode.h main.rb")
    end
  end

  desc 'Build the game for web'
  task :web => :bytecode do
    Dir.mkdir(config_build) unless File.exists?(config_build)
    Dir.mkdir(config_build_web) unless File.exists?(config_build_web)
    Dir.chdir(config_game) do
      if File.exists?('assets')
        system("emcc -Os -Wall -I#{config_web_include} -I#{config_include_mruby} -I#{config_build_temp} #{config_core}/boilerplate_entry.c #{config_web_lib}/libmruby.a #{config_web_lib}/libraylib.a -o #{config_build_web}/index.html -s USE_GLFW=3 -DPLATFORM_WEB --preload-file ./assets --shell-file #{config_core}/shell.html -s TOTAL_MEMORY=268435456 -s ASYNCIFY")
      else
        system("emcc -Os -Wall -I#{config_web_include} -I#{config_include_mruby} -I#{config_build_temp} #{config_core}/boilerplate_entry.c #{config_web_lib}/libmruby.a #{config_web_lib}/libraylib.a -o #{config_build_web}/index.html -s USE_GLFW=3 -DPLATFORM_WEB --shell-file #{config_core}/shell.html -s TOTAL_MEMORY=268435456 -s ASYNCIFY")
      end
    end
  end

  desc 'Build the game for Linux'
  task :tux => :bytecode do
    Dir.mkdir(config_build) unless File.exists?(config_build)
    Dir.mkdir(config_build_tux) unless File.exists?(config_build_tux)
    #Dir.chdir("build/tux") do
    Dir.chdir(config_game) do
      system("zig cc -target native #{config_core}/boilerplate_entry.c -o #{config_build_tux}/game -lGL -lm -lpthread -ldl -lrt -lX11 -I#{config_build_temp} -I#{config_tux_include} -I#{config_include_mruby} #{config_tux_lib}/libmruby.a #{config_tux_lib}/libraylib.a")
    end
    if File.exists?("#{config_game}/assets")
      system("rsync -r #{config_game}/assets #{config_build_tux}") # TODO: maybe get rid of this? copying assets can be costly
    end
  end
  desc 'Build the game for Window'
  task :win do
    Dir.mkdir(config_build) unless File.exists?(config_build)
    Dir.mkdir(config_build_win) unless File.exists?(config_build_win)
    Dir.chdir(config_build_win) do
      system("zig cc -target x86_64-windows-gnu #{config_core}/boilerplate_entry.c -o #{config_build_win}/game -lwinmm -lgdi32 -lopengl32 -lws2_32 -I#{config_build_temp} -I#{config_win_include} -I#{config_include_mruby} #{config_win_lib}/libmruby.a #{config_win_lib}/raylib.lib")
    end
  end
end

desc 'Launch the game with the interpreter'
task :playtest => "build:single_file" do
  Dir.chdir("game") do
    system("#{config_mruby}/build/host/bin/mruby #{config_build_temp}/main.rb")
  end
end
task :p => :playtest


namespace :clean do
  desc "Clean the mruby build folders"
  task :mruby do
    Dir.chdir(config_mruby) do
      system('rake deep_clean')
    end
  end
  task :raylib do
    puts 'Not implemented yet'
  end
  task :game do
    puts 'Not implemented yet'
  end
end

desc "Create a server and open your game in your browser"
task :serve do
  link = "http://localhost:8000/index.html"
  if RbConfig::CONFIG['host_os'] =~ /mswin|mingw|cygwin/
    system "start #{link}"
  elsif RbConfig::CONFIG['host_os'] =~ /darwin/
    system "open #{link}"
  elsif RbConfig::CONFIG['host_os'] =~ /linux|bsd/
    system "xdg-open #{link}"
  end
  `ruby -run -ehttpd #{config_build_web} -p8000`
end
task :s => :serve