module RbSys::Mkmf

def create_rust_makefile(target, &blk)
  if target.include?("/")
    target_prefix, target = File.split(target)
    target_prefix[0, 0] = "/"
  else
    target_prefix = ""
  end
  spec = Struct.new(:name, :metadata).new(target, {})
  builder = CargoBuilder.new(spec)
  yield builder if blk
  srcprefix = "$(srcdir)/#{builder.ext_dir}".chomp("/")
  RbConfig.expand(srcdir = srcprefix.dup)
  full_cargo_command = cargo_command(srcdir, builder)
  # rubocop:disable Style/GlobalVars
  make_install = +<<~MAKE
    RB_SYS_CARGO_PROFILE ?= #{builder.profile}
    RB_SYS_CARGO_FEATURES ?= #{builder.features.join(",")}
    CARGO ?= cargo
    ifeq ($(RB_SYS_CARGO_PROFILE),dev)
      RB_SYS_TARGET_DIR ?= debug
    else
      RB_SYS_TARGET_DIR ?= $(RB_SYS_CARGO_PROFILE)
    endif
    target_prefix = #{target_prefix}
    TARGET_NAME = #{target[/\A\w+/]}
    TARGET_ENTRY = #{RbConfig::CONFIG["EXPORT_PREFIX"]}Init_$(TARGET_NAME)
    CLEANLIBS = $(RUSTLIB) $(DLLIB) $(DEFFILE)
    DISTCLEANDIRS = target/
    RUBYARCHDIR   = $(sitearchdir)$(target_prefix)
    RUSTLIB = #{dllib_path(builder)}
    TARGET = #{target}
    DLLIB = $(TARGET).#{RbConfig::CONFIG["DLEXT"]}
    TARGET_DIR = #{Dir.pwd}/target/$(RB_SYS_TARGET_DIR)
    DEFFILE = $(TARGET_DIR)/$(TARGET)-$(arch).def
    #{base_makefile(srcdir)}
    #{env_vars(builder)}
    FORCE: ;
    $(TARGET_DIR):
    \t$(ECHO) creating target directory \\($(@)\\)
    \t$(Q) $(MAKEDIRS) $(TARGET_DIR)
    $(DEFFILE): $(TARGET_DIR)
    \t$(ECHO) generating $(@)
    \t$(Q) ($(COPY) $(srcdir)/$(TARGET).def $@ 2> /dev/null) || (echo EXPORTS && echo $(TARGET_ENTRY)) > $@
    $(DLLIB): $(DEFFILE) FORCE
    \t$(ECHO) generating $(@) \\("$(RB_SYS_CARGO_PROFILE)"\\)
    \t$(Q) #{full_cargo_command}
    \t$(Q) $(COPY) "$(RUSTLIB)" $@
    install: $(DLLIB) Makefile
    \t$(ECHO) installing $(DLLIB)
    \t$(Q) $(MAKEDIRS) $(RUBYARCHDIR)
    \t$(Q) $(INSTALL_PROG) $(DLLIB) $(RUBYARCHDIR)
    all: #{$extout ? "install" : "$(DLLIB)"}
  MAKE
  gsub_cargo_command!(make_install, builder: builder)
  File.write("Makefile", make_install)
end