#!/bin/bash

# .env contains a line like
# BASE64_BEARER_TOKEN='<literal base64 encoded string>'
source .env

OUTFILE_PATTERN="./videos/video_INDEX.mp4"

read -r -d '' API_URL <<- 'EOM'
https://euwe-1.api.microsoftstream.com/api/videos?
$top=100
&
$skip=0
&
$orderby=metrics/trendingScore desc
&
$filter=
		published{SPACE}
		and{SPACE}
		(
				(
						state eq 'Completed' and contentSource ne 'livestream'
				){SPACE}
				or{SPACE}
				(
						contentSource eq 'livestream'{SPACE}
						and not 
						(
								state eq 'Completed'{SPACE}
								and not 
								liveEvent/LiveEventOptions/OnDemandOptions/EnablePlayback
						)
				)
		)
&
api-version=1.4-private
EOM

API_URL="$(
    printf '%s' "${API_URL}" |
    sed 's/{SPACE}/ /g'      |
    tr -d '\n'
)"

mkdir -p "$(dirname "${OUTFILE_PATTERN}")" || { printf '\033[31m%s\033[m\n' 'Aborting'; exit; }

m3u8_manifest_urls=$(
    wget --no-verbose --quiet -O- --header="authorization: Bearer ${BASE64_BEARER_TOKEN}" "${API_URL}" | \
    jq -r '.value[].playbackUrls | map(select(.mimeType == "application/vnd.apple.mpegurl")) | .[].playbackUrl'
)

if [ -z "${m3u8_manifest_urls}" ]; then
  printf '\033[31m%s\033[m\n' 'Error GETting manifest urls (response empty) or Bearer token invalid/expired. Exiting.'
  exit
fi

idx=1
total=$(printf '%s\n' "${m3u8_manifest_urls}" | wc -l)

ISF="\n"
for m3u8_manifest_url in ${m3u8_manifest_urls}; do
    m3u8_highest_res_url=$(
        curl --silent "${m3u8_manifest_url}" |
        tail -n1                             |
        rev                                  |
        cut -c3-                             |
        rev                                  |
        cut -d'&' -f2                        |
        cut -c13-                            |
        sed 's/keyframes/fragments/g'
    )

    outfile="$(printf '%s' "${OUTFILE_PATTERN}" | sed "s/INDEX/${idx}/g")"

    printf '\033[32m%s\033[m\n' "Download '${outfile}' (${idx}/${total})"

    ffmpeg -hide_banner -loglevel error -headers "authorization: Bearer ${BASE64_BEARER_TOKEN}" -i "${m3u8_highest_res_url}" -progress - -c copy "${outfile}" | grep --line-buffered 'out_time=' | sed -u -e 's/out_time=//g' | xargs -I{} printf '{}\r'

    printf '\n\033[33m%s\033[m\n' "Done"

    idx=$(( idx + 1 ))
done