#!/usr/bin/env bash

# Copyright 2022, FOSS-VG Developers and Contributers
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# version 3 along with this program.
# If not, see https://www.gnu.org/licenses/agpl-3.0.en.html

if [ "$(tr '[:upper:]' '[:lower:]' <<< $SINGLE)" = "yes" ]; then
    echo "Running build script in single-threaded mode."
    WAIT_ANYWAY="wait"
else
    WAIT_ANYWAY=""
fi

if [ -z "$CXX" ]; then
    CXX="c++"
fi
if [ -z "$CXXFLAGS" ]; then
    CXXFLAGS="-std=c++20 -Wall"
fi
CXX_WITH_FLAGS="$CXX $CXXFLAGS"

# if unknown, figure out endianness
if [ -f .endianness ]; then
    echo "Endianness known:"
    cat .endianness
else
    echo "Endianness unknown."
    if [ ! -x resources/check_endianness ]; then
        echo "Building endianness test."
        $CXX_WITH_FLAGS -o resources/check_endianness resources/check_endianness.cpp
    fi
    echo "Probing endianness:"
    resources/check_endianness > .endianness
fi

# `.cpp` files in src/lib will be automatically picked up and compiled into
# dynamically linked libraries.
echo "Building libs..."
mkdir -pv bin/lib
for lib in $(find ./src/lib -name "*.cpp"); do
    COMPILE_COMMAND="$CXX_WITH_FLAGS -I ./include -fPIC -shared -o $(sed -e 's/^.\/src/.\/bin/;s/cpp$/so/' <<< $lib) $lib"
    echo $COMPILE_COMMAND
    $COMPILE_COMMAND &
    $WAIT_ANYWAY
done

wait

# Commands for every program need to be given individually because we can't
# just add all shared libraries to all programs.
# Or can we? Idk, cba to find out.

# How to build a tool: Tell the compiler where to find shared libraries and
#   which libraries to use.
# Example: shared libraries are in bin/lib => -Lbin/lib
#   one of the libraries in that directory is nbt.so => use with -l:nbt.so
# How to run a tool: specify the library path to use for the dynamic linker
#   when running a program
# Example: LD_LIBRARY_PATH=bin/lib bin/tools/dumpnbt
echo "Building tools..."
mkdir -pv bin/tools
# add compile commands to this array
COMPILE_COMMANDS=(
    "$CXX_WITH_FLAGS src/tools/dumpnbt.cpp -I./include -Lbin/lib -l:nbt.so -l:javacompat.so -o bin/tools/dumpnbt"
    "$CXX_WITH_FLAGS src/tools/hexnet.cpp -I./include -Lbin/lib -l:cli.so -l:libsockpp.so -o bin/tools/hexnet"
)
for command in ${!COMPILE_COMMANDS[@]}; do
    echo "${COMPILE_COMMANDS[command]}"
    ${COMPILE_COMMANDS[command]} &
    $WAIT_ANYWAY
done

wait