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#!/bin/sh

PROG="$(basename "$0")"
## VARIABLES
# copy command and deps variable
deps="pup curl $MENUCMD"

LIBPFX=/home/aluc/.local/share/tsh
module='1337x.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"

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

if [ "$WAYLAND_DISPLAY" ]
then
	clipp() { wl-copy -n; }
	deps="$deps wl-copy"
else
	clipp() { xclip -selection clipboard -r; }
	deps="$deps xclip"
fi
## FUNCTIONS

help ()
{
	>&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
	EOF
}

log () { >&2 printf '%s' "$*"; }
logn () { >&2 printf '%s\n' "$*"; }
die () { logn "$@"; exit 1; }

confirm()
{
	log "$1"
	head -n 1 | grep -q "[yY]"
}

dependencies ()
{
	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
}

# shellcheck disable=SC2046
# (we use word splitting on purpose)
isOnline () { grep -q '1' $(echo /sys/class/net/*/carrier | sed 's#/sys/class/net/lo/carrier ##'); }

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

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

# get a query from user based on MENUCMD
get_query ()
{
	isOnline || exit 1
	if [ "${query:="$*"}" ]
	then
		printf "%s" "$query"
	else
		log ' > '
		head -n 1
	fi | tr ' ' '+'
}

# Select a result from the result file sorterd with sort_results
# and select with fzf
select_result ()
{
	command -v sort_results > /dev/null || sort_results() { sort -k3 -n -r; }
	awk '{print NR, $0}' "$results" |
		sort_results |
		column -t -l 3 |
		fzf -m --with-nth 2.. |
		awk '{print $1}'
}

show_files()
{
	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
}

# Select a type after having displayed them with 'show_types'
select_type()
{
	for type in $types
	do printf "%s\n" "$type"
	done | fzf
}

trap "exit 1" INT
trap "cleanup" EXIT

## OPTIONS
skip=0
while getopts ":hm:rs:" opt
do
	case $opt in
		h) help && exit ;;
		m)
			[ "$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))

dependencies

# Get the torrents with module
if [ $skip -ne 1 ]
then
	mkdir -p "$tmp"

	query="$(get_query "$*")"
	[ "$query" ] || exit 1

	# Get results
	rm -f "$results" "$links"
	# shellcheck source=/usr/local/lib/$PROG/nyaa.sh disable=SC1091
	. "$LIBPFX/$module"
	[ -f "$results" ] || die "No results."

	# Save which module was used
	printf "%s\n" "$module" >> "$links"
else
	module="$(tail -n 1 "$links")"
fi

# acquire get_magnet function
# shellcheck source=/usr/local/lib/$PROG/nyaa.sh disable=SC1091
getfunctions=1 . "$LIBPFX/$module"

# select result from "$results"
for choice in $(select_result | xargs)
do
    printf 'choice: %s\n' "$choice"
    magnet="$(get_magnet "$choice")"
    [ "$magnet" ] || exit 1

    confirm 'files?' && show_files "$magnet"

    if confirm 'download?'
    then
	    type="$(select_type)"
	    [ "$type" ] || exit 1
	    transmission-remote debuc.com -a "$magnet" -w "/downloads/$type"
    elif confirm "copy?"
    then
	    echo "$magnet" | clipp
    fi

done