#!/usr/bin/env bash

set -e

# Pretty fancy method to get reliable the absolute path of a shell
# script, *even if it is sourced*. Credits go to GreenFox on
# stackoverflow: http://stackoverflow.com/a/12197518/194894
pushd . > /dev/null
SCRIPTDIR="${BASH_SOURCE[0]}";
while([ -h "${SCRIPTDIR}" ]); do
    cd "`dirname "${SCRIPTDIR}"`"
    SCRIPTDIR="$(readlink "`basename "${SCRIPTDIR}"`")";
done
cd "`dirname "${SCRIPTDIR}"`" > /dev/null
SCRIPTDIR="`pwd`";
popd  > /dev/null

SMACK_DIR=$(realpath "${SCRIPTDIR}"/..)

declare -A SMACK_EXCEPTIONS
SMACK_EXCEPTIONS[NotConnectedException]="if the XMPP connection is not connected."
SMACK_EXCEPTIONS[InterruptedException]="if the calling thread was interrupted."
SMACK_EXCEPTIONS[XMPPErrorException]="if there was an XMPP error returned."
SMACK_EXCEPTIONS[NoResponseException]="if there was no response from the remote entity."
SMACK_EXCEPTIONS[NotLoggedInException]="if the XMPP connection is not authenticated."
SMACK_EXCEPTIONS[BOSHException]="if an BOSH related error occurred."
SMACK_EXCEPTIONS[IOException]="if an I/O error occurred."
SMACK_EXCEPTIONS[SmackException]="if Smack detected an exceptional situation."
SMACK_EXCEPTIONS[XMPPException]="if an XMPP protocol error was received."
SMACK_EXCEPTIONS[SmackSaslException]="if a SASL specific error occurred."
SMACK_EXCEPTIONS[SASLErrorException]="if a SASL protocol error was returned."
SMACK_EXCEPTIONS[NotAMucServiceException]="if the entity is not a MUC serivce."
SMACK_EXCEPTIONS[NoSuchAlgorithmException]="if no such algorithm is available."
SMACK_EXCEPTIONS[KeyManagementException]="if there was a key mangement error."
SMACK_EXCEPTIONS[XmppStringprepException]="if the provided string is invalid."
SMACK_EXCEPTIONS[XmlPullParserException]="if an error in the XML parser occurred."
SMACK_EXCEPTIONS[SmackParsingException]="if the Smack parser (provider) encountered invalid input."
SMACK_EXCEPTIONS[MucNotJoinedException]="if not joined to the Multi-User Chat."
SMACK_EXCEPTIONS[MucAlreadyJoinedException]="if already joined the Multi-User Chat."7y
SMACK_EXCEPTIONS[NotALeafNodeException]="if a PubSub leaf node operation was attempted on a non-leaf node."
SMACK_EXCEPTIONS[FeatureNotSupportedException]="if a requested feature is not supported by the remote entity."
SMACK_EXCEPTIONS[MucConfigurationNotSupportedException]="if the requested MUC configuration is not supported by the MUC service."
SMACK_EXCEPTIONS[CouldNotConnectToAnyProvidedSocks5Host]="if no connection to any provided stream host could be established"
SMACK_EXCEPTIONS[NoSocks5StreamHostsProvided]="if no stream host was provided."
SMACK_EXCEPTIONS[SmackMessageException]="if there was an error."
SMACK_EXCEPTIONS[SecurityException]="if there was a security violation."
SMACK_EXCEPTIONS[InvocationTargetException]="if a reflection-based method or constructor invocation threw."
SMACK_EXCEPTIONS[IllegalArgumentException]="if an illegal argument was given."
SMACK_EXCEPTIONS[NotAPubSubNodeException]="if a involved node is not a PubSub node."
SMACK_EXCEPTIONS[NoAcceptableTransferMechanisms]="if no acceptable transfer mechanisms are available"
SMACK_EXCEPTIONS[NoSuchMethodException]="if no such method is declared"
SMACK_EXCEPTIONS[Exception]="if an exception occurred."
SMACK_EXCEPTIONS[TestNotPossibleException]="if the test is not possible."
SMACK_EXCEPTIONS[TimeoutException]="if there was a timeout."
SMACK_EXCEPTIONS[IllegalStateException]="if an illegal state was encountered"
SMACK_EXCEPTIONS[NoSuchPaddingException]="if the requested padding mechanism is not availble."
SMACK_EXCEPTIONS[BadPaddingException]="if the input data is not padded properly."
SMACK_EXCEPTIONS[InvalidKeyException]="if the key is invalid."
SMACK_EXCEPTIONS[IllegalBlockSizeException]="if the input data length is incorrect."
SMACK_EXCEPTIONS[InvalidAlgorithmParameterException]="if the provided arguments are invalid."
SMACK_EXCEPTIONS[CorruptedOmemoKeyException]="if the OMEMO key is corrupted."
SMACK_EXCEPTIONS[CryptoFailedException]="if the OMEMO cryptography failed."
SMACK_EXCEPTIONS[CannotEstablishOmemoSessionException]="if no OMEMO session could be established."
SMACK_EXCEPTIONS[UntrustedOmemoIdentityException]="if the OMEMO identity is not trusted."
SMACK_EXCEPTIONS[FailedNonzaException]="if an XMPP protocol failure was received."

MODE=""

SMACK_DIR=$(realpath "${SCRIPTDIR}"/..)
while getopts dm:p: OPTION "$@"; do
	case $OPTION in
	d)
		set -x
		;;
	m)
		MODE=${OPTARG}
		;;
	p)
		SMACK_DIR=${OPTARG}
		;;
	*)
		echo "Unknown option ${OPTION}"
		exit 1
		;;
	esac
done

JAVA_SOURCES_LIST=$(mktemp)
onExit() {
	rm "${JAVA_SOURCES_LIST}"
}
trap onExit EXIT

find ${SMACK_DIR} \
	 -type f \
	 -name "*.java" \
	 -print > "${JAVA_SOURCES_LIST}"

NPROC=$(nproc)

sed_sources() {
	sedScript=${1}

	xargs \
		--max-procs="${NPROC}" \
		--max-args=8  \
		-- \
		sed \
		  --in-place \
		  --follow-symlinks \
		  --regexp-extended \
		  "${sedScript}" < "${JAVA_SOURCES_LIST}"
}

show_affected() {
	echo ${!SMACK_EXCEPTIONS{@}}
	for exception in ${!SMACK_EXCEPTIONS[@]}; do
		xargs grep " \* @throws $exception$" < "${JAVA_SOURCES_LIST}"
	done
	for exception in ${!SMACK_EXCEPTIONS[@]}; do
		local count
		count=$(<"${JAVA_SOURCES_LIST}" xargs grep " \* @throws $exception$" |\
						  wc -l)
		echo "$exception $count"q
	done

}

fix_affected() {
	for exception in "${!SMACK_EXCEPTIONS[@]}"; do
		exceptionJavadoc=${SMACK_EXCEPTIONS[${exception}]}
		sed_sources "s;@throws ((\w*\.)?${exception}) ?\$;@throws \1 ${exceptionJavadoc};"
	done
}

add_todo_to_param_and_return() {
	sed_sources "s;@(param|return) (\w*)\$;@\1 \2 TODO javadoc me please;"
}

case $MODE in
	show)
		show_affected
		;;
	fix)
		fix_affected
		;;
	*)
		echo "Unknown mode ${mode}"
		exit 1
esac