#!/bin/bash
# generate empty templates or add functions given a defined language

usage()
{
    head -n 2
}

generate_java_class()
{
    cat <<EOF >$JAVA_FILE
package $PACKAGE;

/**
 $CLASS was autogenerated by $TOOLP
 **/
public $ctype $CLASS
{
    Object param;

    $CLASS(Object param)
    {
       this.param=param;
    }

    void method()
    {
       System.out.println("Method of $PACKAGE.$CLASS");
    }

  public static void main(String args[]) {
    if ( args.length > 1 )
    {
      $CLASS instance=new $CLASS(args[1]);
      instance.method();
    }
    else 
    {
      System.err.println("Missing argument for $CLASS");
    }
  }
}
EOF
}

generate_java_interface()
{
cat <<EOF >$JAVA_FILE
package $PACKAGE;

/**
 $CLASS was autogenerated by $TOOLP
 **/
public $ctype $CLASS
{
    /**
       @return X
    */
    int getX();

    /**
       @return Y
    */
    int getY();
}
EOF
}

add_new_c_main()
{
    cat <<EOF >>$C_FILE
# autogenerated by $TOOLP
int main(int argc, char **argv)
{
    todo(\"Code this\");
    return 0;
}
EOF
}

add_new_c_function()
{
    echo "[INFO] add new c function $FUNCTION in h_file=$H_FILE and c_file=$C_FILE"
    if [[ $FUNCTION == main ]]
    then
	add_new_c_main
    else	
    cat <<EOF >>$H_FILE
# autogenerated by $TOOLP
int $FUNCTION();
EOF
    cat <<EOF >>$C_FILE
# autogenerated by $TOOLP
int $FUNCTION(){
    todo(\"Code this $FUNCTION\");
    return -2;
}
EOF
    fi
}

#TODO : support "like=" to copy/renaming an existing class

TOOLP="$0 $*"

ctype=class
genlang=java

while [[ $# > 0 ]]
do
    case $1 in
	class|interface)
	    ctype=$1
	    ;;
	package=*)
	    PACKAGE=${1/package=/}
	    ;;
	package_dir=*)
	    PACKAGE_DIR=${1/package=/}
	    PACKAGE=${PACKAGE//\//\.}
	    ;;
	genlang=*)
	    genlang=${1/genlang=/}
	    ;;
	class=*)
	    CLASS=${1/class=/}
	    ;;
	function=*)
	    FUNCTION=${1/function=/}
	    ;;
	c_file=*)
	    C_FILE=${1/c_file=}
	    ;;
	h_file=*)
	    H_FILE=${1/h_file=}
	    ;;	
	*)
	    if [[ -z $CLASS ]]
	    then
		CLASS=${1}
		echo "[INFO] setting class=$CLASS" >&2
	    else		
		echo "[ERROR] unrecognized parameter $1" >&2
	    fi
	    ;;
    esac
    shift 1
done


if [[ $genlang == java ]]
then

    if [[ -z $PACKAGE ]]
    then
	echo "[INFO] obtain package name from project settings"
	PACKAGE=$(./debianize.sh getproject_mainpackage)
	if [[ -z $PACKAGE ]]
	then
	    echo "[ERROR] can't find project_mainpackage" >&2
	    exit 1
	fi
    fi

    if [[ -z $CLASS ]]
    then
	echo "[ERROR] Missing class" >&2
	exit 1
    fi

    PACKAGE_DIR=${PACKAGE//\./\/}

    if [[ ! -d $PACKAGE_DIR ]]
    then
	echo "Missing $PACKAGE_DIR" >&2
	exit 1
    fi

    JAVA_FILE=$PACKAGE_DIR/$CLASS.java
    if [[ -e $JAVA_FILE ]]
    then
	echo "[ERROR] $JAVA_FILE already exists" >&2
	exit 1
    else

	if [[ $ctype == class ]]
	then
	    generate_java_class
	else
	    generate_java_interface
	fi
    fi

    echo "$JAVA_FILE generated"
elif [[ $genlang == c ]]
then
    if [[ -z $H_FILE ]]
    then
	H_FILE=c/genauto.h
    fi
    if [[ -z $C_FILE ]]
    then
	C_FILE=c/genauto.c
    fi
    add_new_c_function
else
    echo "[ERROR] language genlang=$genlang NOT supported" >&2
    usage
fi