#!/usr/bin/env bash

# Get the absolute repository root path and go there
cd $(dirname "$(pwd)/$0")
REPOSITORY_FOLDER=$(pwd)


# Configuration Values start here

PROJECT_NAME="librr"
GCC_ARGUMENTS="-std=c11 -Wall"

MAIN_OBJECTS_FOLDER="$REPOSITORY_FOLDER/.build/objects"

# End of configuration values



# Constants not meant for configuration

CONFIG_FILE_INCLUDE_PATHS="build-config/include_paths.txt"
MODULE_LIST_PATH="build-config/modules.txt"



function get_include_path_configuration {
    MODULE_NAME=$1

    INCLUDE_CONFIG_PATH="$REPOSITORY_FOLDER/$MODULE_NAME/$CONFIG_FILE_INCLUDE_PATHS"
    INCLUDE_STATEMENTS="-I $REPOSITORY_FOLDER/$MODULE_NAME/inc-c/ -I $REPOSITORY_FOLDER/$MODULE_NAME/exports/"
    if [[ ! -f $INCLUDE_CONFIG_PATH ]]
    then
        return
    fi

    for LINE in $(cat $INCLUDE_CONFIG_PATH)
    do
        INCLUDE_STATEMENTS="$INCLUDE_STATEMENTS -I $REPOSITORY_FOLDER/$LINE"
    done
}

# Arguments:
#   1) Module name / folder name in project root (May not include slashes)
function compile_single_module() {
    MODULE_NAME=$1

    ENTRY_WORKING_DIR=$(pwd)
    printf "\n\n\n"
    echo "|================> Module Separator <================|"
    echo "> Name: $MODULE_NAME "
    echo "> Path: $REPOSITORY_FOLDER/$MODULE_NAME"
    echo " "
    get_include_path_configuration $MODULE_NAME

    MODULE_OBJECTS_FOLDER="$MAIN_OBJECTS_FOLDER/$MODULE_NAME"
    mkdir -p $MODULE_OBJECTS_FOLDER
    cd $REPOSITORY_FOLDER/$1

    cd src-c/
    for SOURCE_FILE in $(find . -mindepth 1)
    do
        # Create all subfolders of this module's source folder        
        if [[ -d $SOURCE_FILE ]] then
            mkdir -p $MODULE_OBJECTS_FOLDER/$SOURCE_FILE
            continue
        fi

        # If this is not a regular file, quietly ignore it.
        if [[ ! -f $SOURCE_FILE ]] then
            continue
        fi

        # Cut out the ./ at the front of the path
        SOURCE_FILE=$(echo $SOURCE_FILE | cut -c 3-)

        echo "==> File:           $SOURCE_FILE"
        gcc -c $GCC_ARGUMENTS -o $MODULE_OBJECTS_FOLDER/$SOURCE_FILE.o $SOURCE_FILE $INCLUDE_STATEMENTS
    done

    OBJECT_FILES=$(find $MODULE_OBJECTS_FOLDER -mindepth 1 -type f)
    ar -rvs $REPOSITORY_FOLDER/.build/$PROJECT_NAME-$MODULE_NAME.a $OBJECT_FILES
    cd $ENTRY_WORKING_DIR
}

function compile_all_modules() {
    for MODULE_PATH in $(cat $MODULE_LIST_PATH)
    do
        compile_single_module $MODULE_PATH
    done
}

case $1 in
    "release")
        GCC_ARGUMENTS="$GCC_ARGUMENTS -O3"
        compile_all_modules
        ;;
    
    "small")
        GCC_ARGUMENTS="$GCC_ARGUMENTS -Os"
        compile_all_modules
        ;;

    "debug")
        GCC_ARGUMENTS="$GCC_ARGUMENTS -p -g3 -Wextra"
        compile_all_modules
        ;;

    *)
        echo "Please choose one of the following profiles:"
        echo "[ release | small | debug ]"
        ;;
esac