#!/bin/bash

# Strip version qualifiers (e.g. "dav1d >= 0.5.0" -> "dav1d")
# FFmpeg's configure passes these to pkg-config
strip_version() {
	echo "$@" | sed 's/ *[><=!].*//'
}

if [ "$1" == "--version" ]; then
	echo "0.29.2"
	exit 0
elif [ "$1" == "--exists" ]; then
	NAME="$2"
	PRINT_ERRORS="0"
	if [ "$NAME" == "--print-errors" ]; then
		NAME=$(strip_version "$3")
		PRINT_ERRORS="1"
	else
		NAME=$(strip_version "$2")
	fi
	if [ "$NAME" == "zlib" ]; then
		exit 0
	elif [ "$NAME" == "opus" ]; then
		exit 0
	elif [ "$NAME" == "vpx" ]; then
		exit 0
	elif [ "$NAME" == "dav1d" ]; then
		exit 0
	else
		if [ "PRINT_ERRORS" == "1" ]; then
			echo "Package $NAME was not found in the pkg-config search path."
			echo "Perhaps you should add the directory containing \`$NAME.pc'"
			echo "to the PKG_CONFIG_PATH environment variable"
		fi
		exit 1
	fi
elif [ "$1" == "--cflags" ]; then
	NAME="$2"
	LIBOPUS_PATH=""
	LIBVPX_PATH=""
	LIBDAV1D_PATH=""
	if [ "$2" == "--libopus_path" ]; then
		LIBOPUS_PATH="$3"
		NAME="$8"
	else
		exit 1
	fi
	if [ "$4" == "--libvpx_path" ]; then
		LIBVPX_PATH="$5"
	else
		exit 1
	fi
	if [ "$6" == "--libdav1d_path" ]; then
		LIBDAV1D_PATH="$7"
	else
		exit 1
	fi
	if [ "$NAME" == "zlib" ]; then
		echo ""
		exit 0
	elif [ "$NAME" == "opus" ]; then
		echo "-I$LIBOPUS_PATH/include/opus"
		exit 0
	elif [ "$NAME" == "vpx" ]; then
		echo "-I$LIBVPX_PATH/include"
		exit 0
	elif [ "$NAME" == "dav1d" ]; then
		echo "-I$LIBDAV1D_PATH/include"
		exit 0
	else
		exit 1
	fi
elif [ "$1" == "--libs" ]; then
	NAME="$2"
	LIBOPUS_PATH=""
	LIBVPX_PATH=""
	LIBDAV1D_PATH=""
	if [ "$2" == "--libopus_path" ]; then
		LIBOPUS_PATH="$3"
		NAME="$8"
	else
		exit 1
	fi
	if [ "$4" == "--libvpx_path" ]; then
		LIBVPX_PATH="$5"
	else
		exit 1
	fi
	if [ "$6" == "--libdav1d_path" ]; then
		LIBDAV1D_PATH="$7"
	else
		exit 1
	fi
	if [ "$NAME" == "zlib" ]; then
		echo "-lz"
		exit 0
	elif [ "$NAME" == "opus" ]; then
		echo "-L$LIBOPUS_PATH/lib -lopus -lm"
		exit 0
	elif [ "$NAME" == "vpx" ]; then
		echo "-L$LIBVPX_PATH/lib -lVPX -lm -lpthread"
		exit 0
	elif [ "$NAME" == "dav1d" ]; then
		echo "-L$LIBDAV1D_PATH/lib -ldav1d -lm -lpthread -ldl"
		exit 0
	else
		exit 1
	fi
elif [[ "$1" == --variable=* ]]; then
	# Handle --variable=includedir etc.
	LIBOPUS_PATH=""
	LIBVPX_PATH=""
	LIBDAV1D_PATH=""
	# Parse the library path flags to find NAME (last arg)
	ARGS=("$@")
	NAME="${ARGS[-1]}"
	for ((i=1; i<${#ARGS[@]}-1; i++)); do
		if [ "${ARGS[$i]}" == "--libopus_path" ]; then
			LIBOPUS_PATH="${ARGS[$((i+1))]}"
		elif [ "${ARGS[$i]}" == "--libvpx_path" ]; then
			LIBVPX_PATH="${ARGS[$((i+1))]}"
		elif [ "${ARGS[$i]}" == "--libdav1d_path" ]; then
			LIBDAV1D_PATH="${ARGS[$((i+1))]}"
		fi
	done
	VAR="${1#--variable=}"
	if [ "$VAR" == "includedir" ]; then
		if [ "$NAME" == "opus" ]; then
			echo "$LIBOPUS_PATH/include"
			exit 0
		elif [ "$NAME" == "vpx" ]; then
			echo "$LIBVPX_PATH/include"
			exit 0
		elif [ "$NAME" == "dav1d" ]; then
			echo "$LIBDAV1D_PATH/include"
			exit 0
		elif [ "$NAME" == "zlib" ]; then
			echo "/usr/include"
			exit 0
		fi
	fi
	# Return empty string for unhandled variables (non-fatal)
	echo ""
	exit 0
else
	exit 1
fi