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#!/bin/sh

PROG="$(basename "$0")"
## VARIABLES
# copy command and deps variable
deps="pup curl clipp transmission-cli"

MODULES_PATH=$HOME/.local/share/tsh
module='nyaa.sh' # default module

# Files
export tmp="/tmp/$PROG"

files="seeds sizes names html tmp_types"
# Use export so that these variables can be used inside of modules
for file in $files; do
	eval "export $file=$tmp/$file"
done

# Files not in $files won't be deleted
export results="$tmp/results"
export links="$tmp/links"

categories="music anime movies shows other software games isos books"

logn() { >&2 printf '%s\n' "$*"; }
die() {
	logn "$@"
	exit 1
}
confirm() {
	>&2 printf '%s' "$1"
	head -n 1 | grep -q "[yY]"
}

# Remove temp files and quit
cleanup() {
	for file in $files; do
		eval "rm -f \$$file"
	done
}

list_modules() { find -L "$MODULES_PATH" -type f -printf "%f\n"; }

trap "exit 1" INT
trap "cleanup" EXIT

## OPTIONS
skip=0
while getopts ":hm:rs:c:fd" opt; do
	case $opt in
	h)
		>&2 cat <<-EOF
			Usage: $PROG [options] query
			Options:
			    -h           Show this help message and exit
			    -r           Skip getting pages and use last results
			    -s OPTION    Sort results based on the specified OPTION
			                 Available options: seeds, size, name
			    -m MODULE    Select a module, if MODULE is 'list',
			                 lists out available modules
			            -c CATEGORY  Select category
			            -f           Do not list files
			            -d   Download without confirming
		EOF

		exit
		;;
	c)
		[ "$OPTARG" = "list" ] && >&2 printf '%s\n' "$categories" && exit
		category="$(printf '%s\n' "$categories" | tr ' ' '\n' | grep -m 1 "^$OPTARG")"
		[ -z "$category" ] && die "No valid category for '$OPTARG'"
		logn "category: $category"
		;;
	f) noaskfiles="1" ;;
	d) noaskdownload="1" ;;
	m)
		[ "$OPTARG" = "list" ] && list_modules && exit
		module="$(list_modules | grep -m 1 "^$OPTARG")"
		[ -z "$module" ] && die "No valid module for '$OPTARG'"
		logn "module: $module"
		;;
	r)
		[ ! -r "$results" ] && die "No previous results found."
		skip=1
		;;
	s)
		case $OPTARG in
		"seeds") sort_results() { sort -k3 -n -r; } ;;
		"size") sort_results() { sort -k2 -h -r; } ;;
		"name") sort_results() { sort -k4; } ;;
		*) die "argument '$OPTARG' not seeds,size,name" ;;
		esac
		;;
	:) die "Option -$OPTARG requires an argument" ;;
	?) die "Invalid option: -$OPTARG" ;;
	esac
done
shift $((OPTIND - 1))

for p in $deps; do
	if ! command -v "$p" >/dev/null; then
		logn "E: Program '$p' not found."
		error=1
	fi
done
[ "${error:-0}" -eq 1 ] && exit 1

# Get the torrents with module
if [ $skip -eq 1 ]; then
	module="$(tail -n 1 "$links")"
else
	mkdir -p "$tmp"

	query="$(
		if [ "${query:="$*"}" ]; then
			printf "%s" "$query"
		else
			>&2 printf ' > '
			head -n 1
		fi | tr ' ' '+'
	)"
	[ "$query" ] || exit 1

	# shellcheck source=/usr/local/lib/$PROG/nyaa.sh disable=SC1091
	. "$MODULES_PATH/$module"
	rm -f "$results" "$links"
	get_torrents

	[ -f "$results" ] || die "No results."

	# Save which module was used (hack)
	printf "%s\n" "$module" >>"$links"
fi

command -v sort_results >/dev/null || sort_results() { sort -k3 -n -r; }

# select result from "$results"
for choice in $(
	# Select result(s) from the result file sorted with sort_results
	# with fzf
	awk '{print NR, $0}' "$results" |
		sort_results |
		column -t -l 3 |
		fzf -m --with-nth 2.. |
		awk 'BEGIN{OFS=" "} {print $1}'
); do

	printf 'choice: %s\n' "$(sed -n "${choice}p" "$results" | cut -f 3-)"
	magnet="$(get_magnet "$choice")"
	[ "$magnet" ] || exit 1

	if [ -z "$noaskfiles" ] && confirm 'files?'; then
		hash="${1##*btih:}"
		hash="${hash%%&*}"

		# Download the torrent file from a torrent website
		curl -s "https://itorrents.org/torrent/${hash}.torrent" >"$tmp"/.torrent
		transmission-show "$tmp"/.torrent | sed -n '/^FILES/,$p' | head -n -1 | tail -n +3 >&2
		rm -f "$tmp"/.torrent
	fi

	if [ "$noaskdownload" ] || confirm 'download?'; then
		[ "$category" ] || category="$(printf '%s' "$categories" | tr ' ' '\n' | fzf)"
		[ "$category" ] || exit 2
		transmission-remote debuc.com -a "$magnet" -w "/downloads/$category"
	elif confirm "copy?"; then
		echo "$magnet" | clipp
	fi

done