#!/usr/bin/bash

set -e
export TMP_DIR="$(mktemp -d)";

cleanup() {
    rm -fr "${TMP_DIR}";
}

trap cleanup EXIT


export URL="$1";
export NAME="$2";
export BASE_URL="$3"

if [ -z "${BASE_URL}" ]; then
    export BASE_URL="CHANGEME";
fi


mkdir -p "${NAME}"

export ORIG="$(pwd)";

cd "${TMP_DIR}"

yt-dlp "${URL}" -o "${NAME}"

ffmpeg -i $2.* -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]" -map '[left]' -f s8 -ac 1 -ar 48k "${ORIG}/${NAME}/left.s8" -map '[right]' -f s8 -ac 1 -ar 48k "${ORIG}/${NAME}/right.s8"

ffmpeg -i $2.* -vf fps=20 frame%04d.png
rm $2.*
ls frame*.png | parallel 'echo {}; python3 ${ORIG}/cc-pic.py -W 164 -H 81 -p cover {} ${ORIG}/${NAME}/{.}.cpi'
rm frame*.png

cd "${ORIG}"

export FRAME_COUNT="$(ls ${NAME}/*.cpi | wc -l)";

#'{"frame_time": 0.05,"frame_count": ${FRAME_COUNT},"video": "${BASE_URL}/${NAME}/frame%04d.cpi","audio": {"l": "${BASE_URL}/${NAME}/left.s8", "r": "${BASE_URL}/${NAME}/right.s8"}}' > "${NAME}/${NAME}.json"
printf '{"frame_time": 0.05, "frame_count": %d, "video": "%s", "audio": {"l": "%s", "r": "%s"}}\n' "${FRAME_COUNT}" "${BASE_URL}/${NAME}/frame%04d.cpi" "${BASE_URL}/${NAME}/left.s8" "${BASE_URL}/${NAME}/right.s8" > "${NAME}/${NAME}.json"