#!/bin/sh

# dependencies: sed curl

prog="ani-cli"

help_text () {
	while IFS= read line; do
		printf "%s\n" "$line"
	done <<-EOF
	USAGE: $prog <query>
	EOF
}


die () {
	printf "%s\n" "$*" >&1
	exit 1
}

search_anime () {
	# get anime name along with its id
	search=$1
	titlepattern='<a href="/category/'

	curl -s "https://gogoanime.vc//search.html" \
		-G \
		-d "keyword=$search" |
	sed -n -E '
        #<a href="/category/one-punch-man" title="One Punch Man">
		s_^[[:space:]]*<a href="/category/([^"]*)" title="([^"]*)".*_\1_p
		'
}

search_eps () {
	# get available episodes for anime_id
	anime_id=$1

	curl -s "https://gogoanime.vc/category/$anime_id" |
	sed -n -E '
		/^[[:space:]]*<a href="#" class="active" ep_start/{
		s/.* '\''([0-9]*)'\'' ep_end = '\''([0-9]*)'\''.*/\2/p
		q
		}
		'
}

get_links () {
	# get the download page url
	anime_id=$1
	ep_no=$2

	dpage_url=$(
	curl -s "https://gogoanime.vc/$anime_id-episode-$ep_no" |
	sed -n -E '
		/^[[:space:]]*<li class="dowloads">/{
		s/.*href="([^"]*)".*/\1/p
		q
		}')

	curl -s "$dpage_url" |
	sed -n -E '
		/^[[:space:]]*href="([^"]*\.mp4)".*/{
		s/^[[:space:]]*href="([^"]*\.mp4)".*/\1/p
		q
		}
		'
}

#####################
## Anime selection ##
#####################

case $1 in
	-h|--help)
		help_text
		exit 0
		;;
esac

[ -z "$*" ] && { help_text ; die "Search query not provided";  }

query="$*"
search_results=$(search_anime "$query")

[ -z "$search_results" ] && die "No search results found"

# Creating menu

count=1
while read anime_id; do
	printf "[%d] %s\n" "$count" "$anime_id"
	count=$((count+1))
done <<EOF
$search_results
EOF

printf "%s" "Enter number: "
read choice

[ "$choice" -eq "$choice" ] 2>/dev/null || die "Invalid number entered"

count=1
while read anime_id; do
	if [ $count -eq $choice ]; then
		selection_id=$anime_id
		break
	fi
	count=$((count+1))
done <<EOF
$search_results
EOF

[ -z "$selection_id" ] && die "Invalid number entered"

##################
## Ep selection ##
##################
read last_ep_number <<EOF
$(search_eps "$selection_id")
EOF

printf "Choose episode [1-$last_ep_number]: "
read ep_choice

[ "$choice" -eq "$choice" ] 2>/dev/null || die "Invalid number entered"


while :; do

	if [ $ep_choice -lt 1 ] || [ $ep_choice -gt $last_ep_number ]; then
		die "Episode out of range"
	fi

	printf "Getting data for episode %d\n" $ep_choice

	video_url=$(get_links "$selection_id" "$ep_choice")

	case $video_url in
		*streamtape*)
			BROWSER=${BROWSER:-firefox}
			printf "scraping streamtape.com\n"
			video_url=$(curl -s "$video_url" | sed -n -E '
				/^<script>document/{
				s/^[^"]*"([^"]*)" \+ '\''([^'\'']*).*/https:\1\2\&dl=1/p
				q
				}
			');;
	esac

	setsid -f mpv "$video_url" >/dev/null 2>&1

	printf "\nCurrently playing %s episode %d/%d\n" "$selection_id" $ep_choice $last_ep_number
	printf "[n] next episode\n"
	printf "[p] previous episode\n"
	printf "[q] exit\n"
	printf "Enter choice: " 
	read choice 
	case $choice in
		n) 
			ep_choice=$((ep_choice+1))
			;;
		p)
			ep_choice=$((ep_choice-1))
			;;
		q)
			exit 0;;
		*)
			die "invalid choice"
			;;
	esac
done