#!/bin/bash

# gets a Godot release, fetches export templates, 
# and builds a project with its native export options

################################################################################
PWD=`pwd`
DIR_DOWNLOAD=$PWD/download
DIR_TEMPLATES=$DIR_DOWNLOAD/templates
DIR_DEBUG=$PWD/debug
DIR_RELEASE=$PWD/release
DIR_PROJECT=$PWD/project

GODOT_VERSION=4.4-stable
GODOT_ZIP=Godot_v${GODOT_VERSION}_linux.x86_64.zip
GODOT_EXE=Godot_v${GODOT_VERSION}_linux.x86_64
GODOT_URI=https://github.com/godotengine/godot/releases/download/$GODOT_VERSION/$GODOT_ZIP

GODOT_EXPORT_TEMPLATES=Godot_v${GODOT_VERSION}_export_templates.tpz
GODOT_TEMPLATE_URI=https://github.com/godotengine/godot/releases/download/$GODOT_VERSION/$GODOT_EXPORT_TEMPLATES

GODOT=$DIR_DOWNLOAD/$GODOT_EXE

################################################################################
# get Godot

[[ -d $DIR_DOWNLOAD ]] || mkpath -p $DIR_DOWNLOAD 
[[ -f $DIR_DOWNLOAD/$GODOT_ZIP ]] || wget -P $DIR_DOWNLOAD $GODOT_URI
[[ -f $DIR_DOWNLOAD/$GODOT_EXE ]] || unzip $DIR_DOWNLOAD/$GODOT_ZIP -d $DIR_DOWNLOAD

echo Godot version - $($GODOT --headless --version)

################################################################################
# get export templates

[[ -f $DIR_DOWNLOAD/$GODOT_EXPORT_TEMPLATES ]] || wget -P $DIR_DOWNLOAD $GODOT_TEMPLATE_URI
[[ -d $DIR_TEMPLATES ]] || unzip -d $DIR_DOWNLOAD $DIR_DOWNLOAD/$GODOT_EXPORT_TEMPLATES

GODOT_TEMPLATE_VERSION=$(cat $DIR_TEMPLATES/version.txt)
LOCAL_TEMPLATES=$HOME/.local/share/godot/export_templates/$GODOT_TEMPLATE_VERSION
if [[ ! -d $LOCAL_TEMPLATES ]]
then
    mkdir -p $LOCAL_TEMPLATES
    cp $DIR_TEMPLATES/* $LOCAL_TEMPLATES
    # TODO: leaves extra copy of templates
fi

echo Godot export template version - $GODOT_TEMPLATE_VERSION
echo Local templates - $LOCAL_TEMPLATES

################################################################################
# execute project build

# iterate through all build types present in config file
EXPORT_PRESETS_CFG=$DIR_PROJECT/export_presets.cfg
GODOT_OPTS="--headless --path $DIR_PROJECT"

# if arg is given, override automated export discovery
if [[ -n "$1" ]]
then
    EXPORT_NAMES=$1
else
    EXPORT_NAMES=$(awk -F= '$1=="name"{print $2}' $EXPORT_PRESETS_CFG | sed 's/"//g')
fi

for EXPORT_NAME in $EXPORT_NAMES
do
    echo
    echo Starting project build for export $EXPORT_NAME

    # create build folders
    [[ -d $DIR_RELEASE/$EXPORT_NAME ]] || mkdir -p $DIR_RELEASE/$EXPORT_NAME
    [[ -d $DIR_DEBUG/$EXPORT_NAME ]] || mkdir -p $DIR_DEBUG/$EXPORT_NAME

    # get export name from config file
    EXPORT_FNAME=$(awk -vname=${EXPORT_NAME} -F= \
        '$1=="name" && $2~name{f=1} f==1 && $1=="export_path"{print $2;exit}' \
        $EXPORT_PRESETS_CFG | sed -e 's|^.*/||' -e 's/"//g')

    # do build!
    echo $GODOT $GODOT_OPTS --export-debug "$EXPORT_NAME" $DIR_DEBUG/$EXPORT_NAME/$EXPORT_FNAME
    $GODOT $GODOT_OPTS --export-debug "$EXPORT_NAME" $DIR_DEBUG/$EXPORT_NAME/$EXPORT_FNAME
    echo $GODOT $GODOT_OPTS --export-release "$EXPORT_NAME" $DIR_RELEASE/$EXPORT_NAME/$EXPORT_FNAME
    $GODOT $GODOT_OPTS --export-release "$EXPORT_NAME" $DIR_RELEASE/$EXPORT_NAME/$EXPORT_FNAME
done