#!/usr/bin/env bash
# Export to make android build and clean work
export ANDROID_NDK_ROOT="$HOME/.android-sdk/ndk/23.2.8568313"

# Folders
_build_folder="gdextension"
_bin_folder="build"

# Error variables
_error_build_folder="${_build_folder} doesn't exist"
_error_bin_folder="${_bin_folder} doesn't exist"
_error_no_option="\nYou have to indicate a valid option"

# Platform variables
_platform_linux="linux"
_platform_windows="windows"
_platform_android="android"
_default_platform="$_platform_linux"

# Clean variables and exit
function clean_exit() {

    if [ -v 2 ]; then
        echo -e "$2"
        unset 2
    fi

    unset _default_platform
    unset _platform_android
    unset _platform_windows
    unset _platform_linux

    unset _error_no_option
    unset _error_build_folder
    unset _error_bin_folder

    unset _build_folder
    unset _bin_folder

    unset ANDROID_NDK_ROOT
    exit "$1"
}

# Clean compilations
function clean() {
    cd "$_build_folder" || clean_exit 1 "$_error_build_folder"
    scons "platform=${1}" --clean
    cd ..

    for object in build/*."$1".*.*.*; do
        rm --force "$object"
    done

    unset object
    unset 1
}

# Build by passing the platform as a variable
function build() {
    cd "$_build_folder" || clean_exit 1 "$_error_build_folder"
    scons "platform=$1" target=template_release
    scons "platform=$1" target=template_debug
    cd ..

    if [ "$1" != "$_platform_android" ]; then
        cd "$_bin_folder" || clean_exit 1 "$_error_bin_folder"
        strip ./*."$1".template_release.*.*
        cd ..
    fi

    unset 1
}

# Analize build process to create compile_commands.json
function build_db() {
    clean "$_default_platform"
    cd "$_build_folder" || clean_exit 1 "$_error_build_folder"
    bear -- scons platform="$_default_platform"

    if [ ! -f "../{$_bin_folder}/compile_commands.json" ]; then
        ln -s compile_commands.json "../${_bin_folder}/compile_commands.json"
    fi

    cd ..
}

# Display the help
function Help() {
    echo -e "Compiles gdextension using scons\n"
    echo -e "Syntax: build [-b|d|c|a|l|w|A|h]"
    echo -e "Options:"
    echo -e "\t-b for build default"
    echo -e "\t-d for generating a compile_commands.json"
    echo -e "\t-c for cleaning"
    echo -e "\t-a for building for Android"
    echo -e "\t-l for building for Linux"
    echo -e "\t-w for building for Windows"
    echo -e "\t-A for building all"
    echo -e "\t-h for displaying this help"
}

while getopts "bdchawlA" flag; do
    case "$flag" in
        A) # Builds for all platforms
            build "$_platform_linux"
            build "$_platform_windows"
            build "$_platform_android"
            clean_exit 0
            ;;
        a) # Build for android
            build "$_platform_android"
            clean_exit 0
            ;;
        w) # Build for windows
            build "$_platform_windows"
            clean_exit 0
            ;;
        l) # Build for linux
            build "$_platform_linux"
            clean_exit 0
            ;;
        d) # Generate compile_commands.json
            build_db
            clean_exit 0
            ;;
        b) # Default build
            build
            clean_exit 0
            ;;
        c) # Clean compilations
            clean "$_platform_linux"
            clean "$_platform_windows"
            clean "$_platform_android"
            clean_exit 0
            ;;
        h) # Invoque help
            Help
            clean_exit 0
            ;;
        \?) # Erroneus call
            Help
            clean_exit 1 "$_error_no_option"
            ;;
    esac
done

# In case there is no option pass
Help
clean_exit 1 "$_error_no_option"