@echo off
set STARTDIR=%cd%
set OLDPATH=%PATH%
if not exist deps\.prepared call :installdeps
set PATH=%STARTDIR%\deps\x86_64-w64-mingw32-native\bin\;%STARTDIR%\deps\go\bin\;%PATH%
set CC=x86_64-w64-mingw32-gcc.exe
set CFLAGS=-O3 -Wall -std=gnu11
set GOOS=windows
set GOARCH=amd64
set GOPATH=%STARTDIR%\deps\gopath
set GOROOT=%STARTDIR%\deps\go
set CGO_ENABLED=1
echo Assembling resources
windres.exe -i resources.rc -o resources.syso -O coff || goto :error
echo Building program
go build -ldflags="-H windowsgui -s -w" -v -o wireguard.exe || goto :error
goto :out

:installdeps
	rmdir /s /q deps 2> NUL
	mkdir deps || goto :error
	cd deps || goto :error
	echo Downloading golang
	curl -#fo go.zip https://dl.google.com/go/go1.12.windows-amd64.zip || goto :error
	echo Downloading mingw
	curl -#fo mingw.zip https://musl.cc/x86_64-w64-mingw32-native.zip || goto :error
	echo Extracting golang
	tar -xf go.zip || goto :error
	echo Extracting mingw
	tar -xf mingw.zip || goto :error
	echo Cleaning up
	del go.zip mingw.zip || goto :error
	copy /y NUL .prepared > NUL || goto :error
	cd .. || goto :error
	exit /b

:error
	echo Failed with error #%errorlevel%.
:out
	set PATH=%OLDPATH%
	cd %STARTDIR%
	exit /b %errorlevel%