#!/usr/bin/env nux-runner

type ffmpeg > /dev/null 2>&1 &&  FFMPEG_OR_LIBAV=ffmpeg
type avconv > /dev/null  2>&1 &&  FFMPEG_OR_LIBAV=avconv

function task.video.change.container {
	CONTAINER=$1;
	shift;
        echo "Using $FFMPEG_OR_LIBAV for conversion."
	for video in "$@"; do
		echo "Starting processing Video: $video";
		$FFMPEG_OR_LIBAV -i "$video" -vcodec copy -acodec copy "${video}.$CONTAINER"
		echo "Processing done.";
	done
}

function task.nikon-mp4 {
	task.video.change.container mp4 "$@"
}

function task.downscale {
	local TARGET=$1; shift;
	local SIZE=$1; shift
	local i=0;
	local count="$#";
	mkdir -p $TARGET;
	for image in "$@"; do
		let "i=i+1"
		target_file=$TARGET/$(basename $image)
		echo "Image: $i/$count Downsampling  $image -> $target_file"
		convert $image \
			-filter Lanczos -sampling-factor 1x1 \
			-resize "${SIZE}x${SIZE}>" \
			-quality 90 \
			$target_file
	done
}


## to:: <jpg|png> <image...>
##
## Convert image to
##
function task.to {
	target=$1;
	shift;
	if ! nux.check.function "media.to.$target" ; then
		echo Target type "$target" is not supported.
		return -1
	fi
	for file in "$@"; do
		target_dir=$(dirname "$file");
		target_file=$(basename "$file" | sed -re 's/\.[a-z0-9_]+$//g' -e "s/\$/.$target/g" );
		target_full="$target_dir/$target_file";
		media.to.$target "$file" "$target_full"
		echo $file $target_file
	done
}

function media.to.jpg {
	convert "$1" -quality 90 -auto-orient "$2"
}