#!/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"

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

# Platform variables
_platform_linux="platform=linux"
_platform_windows="platform=windows"
_platform_android="platform=android"

# Clean variables and exit
function clean_exit() {

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

    unset _platform_android
    unset _platform_windows
    unset _platform_linux

    unset _error_no_option
    unset _error_build_folder

    unset _build_folder

    unset ANDROID_NDK_ROOT
    exit "$1"
}

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

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

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

    if [ -f ../build/compile_commands.json ]; then
        rm ../build/compile_commands.json
    fi

    cp compile_commands.json ../build/

    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 "$_platform_linux"
            clean_exit 0
            ;;
        d) # Generate compile_commands.json
            build_db
            clean_exit 0
            ;;
        b) # Default build
            build
            clean_exit 0
            ;;
        c) # Clean compilations
            clean
            clean_exit 0
            ;;
        h) # Invoque help
            Help
            clean_exit 0
            ;;
        \?) # Erroneus call
            Help
            clean_exit 1 "$_error_no_option"
            ;;
    esac
done

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