#!/bin/bash

SRCDIR="javatx-src/main/java"
DESTDIR="out"
JAVAC_FLAGS="-g:none -nowarn"
JAVATX_COMPILER_PATH="JavaTXcompiler-1.2-jar-with-dependencies.jar"

#remove all files, if the script is called with parameter "clear"
if [ "$1" = "clean" ]; then
    rm -r "$DESTDIR"
    exit 0
fi

#find all .java/.jav files recursively and store them in an array
JAVA_FILES=($(find "$SRCDIR" -name "*.java"))
JAV_FILES=($(find "$SRCDIR" -name "*.jav"))

#create empty arrays for .class file paths
JAVA_CLASSES=()
JAV_CLASSES=()

JAVA_CHANGED=()
JAV_CHANGED=()

mkdir -p $DESTDIR

#fill class files arrays by subsituting .java/.jav -> .class for each file
for file in "${JAVA_FILES[@]}"; do
    #substitute destination dir with source dir
    class_name="$DESTDIR${file#$SRCDIR}"
    #substitute *.java -> *.class
    class_name="${class_name%.java}.class"
    #if .class file does not exists or .class file older than .java file
    if [ ! -f "$class_name" ] || [ "$(find "$file" -prune -newer "$class_name")" ]; then
        JAVA_CHANGED+=("$file")
        JAVA_CLASSES+=("$class_name")
    fi
done


for file in "${JAV_FILES[@]}"; do
    #substitute destination dir with source dir
    class_name="$DESTDIR${file#$SRCDIR}"
    #substitute *.jav -> *.class
    class_name="${class_name%.jav}.class"
    #if .class file does not exists or .class file older than .jav file
    if [ ! -f "$class_name" ] || [ "$(find "$file" -prune -newer "$class_name")" ]; then
        JAV_CHANGED+=("$file")
        JAV_CLASSES+=("$class_name")
    fi
done


if [ "${#JAV_CHANGED[@]}" -ne 0 ]; then
    for ((i = 0; i < "${#JAV_CHANGED[@]}"; i++)); do
        java -jar $JAVATX_COMPILER_PATH -d "${JAV_CLASSES[i]%/*}" -cp "$SRCDIR:$DESTDIR:target/dependencies/" "${JAV_CHANGED[i]}"
        if [ $? -eq 1 ]; then
          exit 1;
        fi
    done
fi

if [ "${#JAVA_CHANGED[@]}" -ne 0 ]; then
    echo "javac -d $DESTDIR -cp "$SRCDIR:$DESTDIR:target/dependencies/*" $JAVAC_FLAGS ${JAVA_CHANGED[@]}"
    javac -d $DESTDIR -cp "$SRCDIR:$DESTDIR:target/dependencies/*" $JAVAC_FLAGS "${JAVA_CHANGED[@]}"
fi