#!/usr/bin/env bash

: ${CC=gcc}
: ${AR=ar}
: ${MAKE=make}
: ${BIN=lpm}
: ${JOBS=4}

SRCS="src/*.c"
CFLAGS="$CFLAGS -Ilib/prefix/include"
LDFLAGS="$LDFLAGS -lm -Llib/prefix/lib"

[[ "$@" == "clean" ]] && rm -rf lib/libgit2/build lib/zlib/build lib/libzip/build lib/mbedtls-2.27.0/build lib/prefix lua $BIN *.exe src/lpm.luac src/lpm.lua.c && exit 0
cmake --version >/dev/null 2>/dev/null || { echo "Please ensure that you have cmake installed." && exit -1; }

# Build supporting libraries, libz, libmbedtls, libmbedcrypto, libgit2, libzip, libmicrotar, liblua
CMAKE_DEFAULT_FLAGS=" $CMAKE_DEFAULT_FLAGS -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=`pwd`/lib/prefix -DCMAKE_INSTALL_PREFIX=`pwd`/lib/prefix -DBUILD_SHARED_LIBS=OFF"
mkdir -p lib/prefix/include lib/prefix/lib
if [[ "$@" != *"-lz"* ]]; then
  [ ! -e "lib/zlib" ] && echo "Make sure you've cloned submodules. (git submodule update --init --depth=1)" && exit -1
  [[ ! -e "lib/zlib/build" && $OSTYPE != 'msys'* ]] && cd lib/zlib && mkdir build && cd build && $CC -O3 -D_LARGEFILE64_SOURCE -I.. ../*.c -c && $AR rc libz.a *.o && cp libz.a ../../prefix/lib && cp ../*.h ../../prefix/include && cd ../../../
  LDFLAGS="$LDFLAGS -lz"
fi
if [[ "$@" != *"-lmbedtls"* && "$@" != *"-lmbedcrypto"* ]]; then
  [ ! -e "lib/mbedtls-2.27.0/build" ] && cd lib/mbedtls-2.27.0 && mkdir build && cd build && CFLAGS="$CFLAGS_MBEDTLS -DMBEDTLS_MD4_C=1 -w" cmake .. $CMAKE_DEFAULT_FLAGS  -G "Unix Makefiles" -DENABLE_TESTING=OFF -DENABLE_PROGRAMS=OFF $SSL_CONFIGURE && CFLAGS="$CFLAGS $CFLAGS_MBEDTLS -DMBEDTLS_MD4_C=1 -w" $MAKE -j $JOBS && $MAKE install && cd ../../../
  LDFLAGS="$LDFLAGS -lmbedtls -lmbedx509 -lmbedcrypto"
fi
if [[ "$@" != *"-lgit2"* ]]; then
  [ ! -e "lib/libgit2/build" ] && cd lib/libgit2 && mkdir build && cd build && cmake .. -G "Unix Makefiles" $GIT2_CONFIGURE $CMAKE_DEFAULT_FLAGS -DBUILD_TESTS=OFF -DBUILD_CLI=OFF -DREGEX_BACKEND=builtin -DUSE_SSH=OFF -DUSE_HTTPS=mbedTLS && $MAKE -j $JOBS && $MAKE install && cd ../../../
  LDFLAGS="-lgit2 $LDFLAGS"
fi
if [[ "$@" != *"-lzip"* ]]; then
  [ ! -e "lib/libzip/build" ] && cd lib/libzip && mkdir build && cd build && cmake .. -G "Unix Makefiles" $CMAKE_DEFAULT_FLAGS -DBUILD_TOOLS=OFF -DBUILD_EXAMPLES=OFF -DBUILD_DOC=OFF -DENABLE_COMMONCRYPTO=OFF -DENABLE_GNUTLS=OFF -DENABLE_OPENSSL=OFF -DENABLE_BZIP2=OFF -DENABLE_LZMA=OFF -DENABLE_ZSTD=OFF && $MAKE -j $JOBS && $MAKE install && cd ../../../
  LDFLAGS="$LDFLAGS -lzip"
fi
[[ "$@" != *"-lmicrotar"* ]] && CFLAGS="$CFLAGS -Ilib/microtar/src" && SRCS="$SRCS lib/microtar/src/microtar.c"
[[ "$@" != *"-llua"* ]] && CFLAGS="$CFLAGS -Ilib/lua -DMAKE_LIB=1" && SRCS="$SRCS lib/lua/onelua.c"

# Build the pre-packaged lua file into the executbale.
if [[ "$@" == *"-DLPM_STATIC"* ]]; then
  [[ ! -e "lua.exe" ]] && gcc -Ilib/lua -o lua.exe lib/lua/onelua.c -lm
  ./lua.exe -e 'io.open("src/lpm.luac", "wb"):write(string.dump(assert(loadfile("src/lpm.lua"))))'
  xxd -i src/lpm.luac > src/lpm.lua.c
fi

[[ $OSTYPE != 'msys'* && $CC != *'mingw'* && $CC != "emcc" ]] && CFLAGS="$CFLAGS -DLUA_USE_LINUX" && LDFLAGS="$LDFLAGS -ldl"
[[ $OSTYPE == 'msys'* || $CC == *'mingw'* ]]                  && LDFLAGS="$LDFLAGS -lbcrypt -lws2_32 -lz -lwinhttp -lole32 -lcrypt32 -lrpcrt4"
[[ $OSTYPE == *'darwin'* ]]                                   && LDFLAGS="$LDFLAGS -liconv -framework Security -framework Foundation"

[[ " $@" != *" -g"* && " $@" != *" -O"* ]] && CFLAGS="$CFLAGS -O3" && LDFLAGS="$LDFLAGS -s"
$CC $CFLAGS $SRCS $@ -o $BIN $LDFLAGS