#!/usr/bin/env bash

cd $(dirname $0)
SCRIPT_PATH=$(pwd)
cd ..
PROJECT_PATH=$(pwd)

function list_modules() {
    MODULE_FOLDER=$1

    MODULES=$(ls $MODULE_FOLDER)
    for MODULE in $MODULES
    do
        if [[ -d "$MODULE_FOLDER/$MODULE/src-c" ]];
        then
            echo $MODULE
        fi
    done
}

function make_object_name() {
    SOURCE_PATH=$1

    OBJECT_NAME=$(echo $SOURCE_PATH | tr "-" "_" | tr "/" "-")
    echo $OBJECT_NAME.o
}

function list_sources() {
    MODULE_PATH=$1
    ENTRY_PATH=$(pwd)

    cd $MODULE_PATH
    SOURCES=$(find . -type f | grep ".c$")
    for SOURCE in $SOURCES
    do
        echo $SOURCE | cut -c 3-
    done
    cd $ENTRY_PATH
}

function build_dependencies() {
    SOURCES=$(list_sources $PROJECT_PATH/dependencies/src-c)
    mkdir -p .build/dependencies
    rm -f .build/dependencies/*.o
    for SOURCE in $SOURCES
    do
        OBJECT_NAME=$(make_object_name $SOURCE)
        gcc  -c -o $PROJECT_PATH/.build/dependencies/$OBJECT_NAME \
                   $PROJECT_PATH/dependencies/src-c/$SOURCE \
                -I $PROJECT_PATH/dependencies/inc-c
    done
    ar -rvs $PROJECT_PATH/.build/archives/voxula-dependencies.a $PROJECT_PATH/.build/dependencies/*.o
}

function make_include_statements() {
    MODULE_NAME=$1

    for INCLUDE_PATH in $(cat modules/$MODULE_NAME/includes.txt)
    do
        MODIFIED_PATH="${INCLUDE_PATH//"{module}"/"$PROJECT_PATH/modules/$MODULE_NAME"}"
        MODIFIED_PATH="${MODIFIED_PATH//"{module-folder}"/"$PROJECT_PATH/modules"}"
        echo "-I ${MODIFIED_PATH//"{dependencies}"/"$PROJECT_PATH/dependencies"}"
    done
}

function build_single_module() {
    MODULE_NAME=$1

    mkdir -p $PROJECT_PATH/.build/modules/$MODULE_NAME/objects
    rm -f $PROJECT_PATH/.build/modules/$MODULE_NAME/objects/*.o

    echo "| ========================================>"
    echo "| Now building module: $MODULE_NAME"
    echo "| ========================================>"

    INCLUDE_STATEMENTS=$(make_include_statements $MODULE_NAME)

    SOURCES=$(list_sources modules/$MODULE_NAME/src-c)
    for SOURCE in $SOURCES
    do
        echo "> $SOURCE"
        OBJECT_NAME=$(make_object_name $SOURCE)
            gcc -c -o .build/modules/$MODULE_NAME/objects/$OBJECT_NAME \
                -g3 -Wall -Wextra -Wpedantic \
            modules/$MODULE_NAME/src-c/$SOURCE $INCLUDE_STATEMENTS
    done

    if [[ $(ls .build/modules/$MODULE_NAME/objects/ | grep ".o$") == "" ]];
    then
        echo "> Empty Module, not creating archive."
        echo " "
        return
    fi
    ar -rvs .build/archives/voxula-$MODULE_NAME.a .build/modules/$MODULE_NAME/objects/*.o
    echo " "
}

mkdir -p .build/archives
rm -f .build/archives/*.a

build_dependencies

MODULE_LIST=$(list_modules "modules")
for MODULE in $MODULE_LIST
do
    build_single_module $MODULE 
done

gcc -g3 -o voxula .build/archives/*.a .build/archives/*.a -lSDL2 -lGL