#!/usr/bin/env zsh

set -eu -o pipefail

# Dependencies:
# - apt install zsh ripgrep rclone curl jq
# - exastash `es` in PATH
# - environmental variables for exastash including EXASTASH_NO_GDRIVE=1
# - download-scripts `path-to-eye-path` in PATH

# provide as stdin the output of e.g.
# es x find -t f -- ~/stash/YouTube | take-wanted-ids ~/dead-video-ids

# The temporary files will land in ~/stash/YouTube which should be on your SSDs
# The finished files will be moved to:
complete_dir=$1

#

# Enable job control for wait-until-jobs-below
set -m

# Wait until the number of shell jobs drops below a limit.
# This can be used as an alternative to parallel using
# for i in ...; do something $i &; wait-until-jobs-below 8; done
wait-until-jobs-below() {
	while test $(jobs | wc -l) -ge "$1"; do
		sleep 0.1
	done
}

mkdir -p ~/eye-control
cat ~/eye-control/download-parallelism || echo -n 50 > ~/eye-control/download-parallelism

mkdir -p -- "$complete_dir"

while read i; do
	if [[ -f ~/eye-control/stop ]]; then
		echo "exiting because stop file is present"
		exit 1
	fi

	echo -E $i

	eye_path=$(path-to-eye-path "$i" | sed -r "s,$HOME/stash/,,g")
	complete_eye_dir="$(dirname -- "$complete_dir/$eye_path")"
	info=$(es x info -- "$i")
	file_id=$(echo -E "$info" | jq .id)
	size=$(echo -E "$info" | jq .size)

	# If already in namedfiles i.e. the-eye, skip
	echo -E "$info" | rg -q -F '"type": "namedfiles"' && continue || true

	is_video=0
	echo -nE "$i" | rg -q '\.(mp4|webm|flv|video)$' && is_video=1 || true

	the_eye_video_bytes_saved=0
	the_eye_video_files_saved=0
	if [[ $is_video -eq 1 ]]; then
		the_eye_video_bytes_saved=$size
		the_eye_video_files_saved=1
	fi

	# Ideally, we would created a `namedfiles` entity only after it's in ceph,
	# but this is okay: we can later recreate all the `namedfiles` by scanning
	# all of the files in the ceph directory.
	(
		ionice -c 3 nice es x get -s -- "$i" && \
		curl --fail-with-body -u "ya:   ." -X POST -d "{\"file_id\": $file_id, \"location\": \"the-eye\", \"pathname\": \"$eye_path\"}" https://ya.borg.xyz/cgi-bin/new-namedfiles && \
		curl -X POST -d "{\"the_eye_any_bytes_saved\": $size, \"the_eye_video_bytes_saved\": $the_eye_video_bytes_saved, \"the_eye_any_files_saved\": 1, \"the_eye_video_files_saved\": $the_eye_video_files_saved}" "http://eye.borg.xyz:31416/metrics" && \
		mkdir -p -- "$complete_eye_dir" && \
		mv -- "$i" "$complete_eye_dir"/ || true
	) &

	wait-until-jobs-below $(cat ~/eye-control/download-parallelism)
done

wait