#!/usr/bin/env bash

# Set config directory if not already set
if [[ -z "$XDG_CONFIG_HOME" ]]; then
	XDG_CONFIG_HOME="$HOME/.config"
fi

VERBOSE=0

BASE_URL="https://gogoanime.cm"
CFG_DIR="$XDG_CONFIG_HOME/aniwrapper"
ROFI_CFG="meh.rasi"

HISTORY_DB="$XDG_CONFIG_HOME/aniwrapper/history.sqlite3"

# dependencies: grep, sed, curl, video_player, rofi, sqlite3
# video_player ( needs to be able to play urls )
player_fn="mpv"

prog="ani-cli"
logfile="${XDG_CACHE_HOME:-$HOME/.cache}/ani-hsts"

c_red="\033[1;31m"
c_green="\033[1;32m"
c_yellow="\033[1;33m"
c_blue="\033[1;34m"
c_magenta="\033[1;35m"
c_cyan="\033[1;36m"
c_reset="\033[0m"

help_text() {
	while IFS= read line; do
		printf "%s\n" "$line"
	done <<-EOF
		USAGE: $prog <query>
		 -h  show this help text
		 -d  download episode
		 -H  continue where you left off
	EOF
}

die() {
	printf "$c_red%s$c_reset\n" "$*" >&2
	exit 1
}

err() {
	printf "$c_red%s$c_reset\n" "$*" >&2
}

search_anime() {
	# get anime name along with its id
	search=$(printf '%s' "$1" | tr ' ' '-')
	curl -s "$BASE_URL//search.html" \
		-G \
		-d "keyword=$search" |
		sed -n -E 's_^[[:space:]]*<a href="/category/([^"]*)" title="([^"]*)".*_\1_p'
}

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

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

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

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

get_links() {
	dpage_url="$1"

	curl -s "$dpage_url" |
		sed -n -E '
		/href="([^"]*)" download>Download/{
		s/href="([^"]*)" download>Download/\1/p
		q
		}' | tr -d ' '
}

dep_ch() {
	for dep; do
		if ! command -v "$dep" >/dev/null; then
			die "Program \"$dep\" not found. Please install it."
		fi
	done
}

check_anime_name() {
	# Maybe change to query the db for a similar name
	# Check to make sure passed in name is not empty
	[ "$VERBOSE" -eq 1 ] && printf "%s\n" "VAR: $1"
	if [[ "$1" == "" ]] || [[ "$1" == " " ]] || [[ "$1" == "\n" ]]; then
		[ "$VERBOSE" -eq 1 ] &&
			printf "%s\n" "Passed in name is nothing"
		return 1
	fi
	return 0
}

run_stmt() {
	printf "%s\n" "$1" | sqlite3 -noheader "$HISTORY_DB"
}

check_db() {
	# Return number of matches for anime/episode in db
	# echo "$1 $2"
	if [[ "$2" == "search" ]]; then
		stmt="SELECT DISTINCT COUNT(*) \
			  FROM search_history \
			  WHERE anime_name = '$1';"
		res=$(run_stmt "$stmt")
		return "$res"
	else
		stmt="SELECT DISTINCT COUNT(*) \
			  FROM watch_history \
			  WHERE anime_name = '$1' \
			  AND episode_number = $2;"
		res=$(run_stmt "$stmt")
		return "$res"
	fi
}

update_date() {
	# updates search/watch date for passed in anime
	datetime=$(date +'%Y-%m-%d %H:%M:%S')
	stmt=""
	if [[ "$2" == "search" ]]; then
		stmt="UPDATE search_history SET search_date = '$datetime' \
			WHERE anime_name = '$1';"
	else
		stmt="UPDATE watch_history SET watch_date = '$datetime' \
			WHERE anime_name = '$1' \
			AND episode_number = $2;"
	fi
	run_stmt "$stmt"
}

insert_history() {
	# inserts into search/watch history db
	# check the anime_name/id
	check_anime_name "$1"
	if [[ $? -ne 0 ]]; then
		[ "$VERBOSE" -eq 1 ] &&
			printf "%s\n" "ERROR: Anime name is none... exiting"
		return 1
	fi
	datetime=$(date +'%Y-%m-%d %H:%M:%S')
	check_db "$@"
	if [[ $? -gt 0 ]]; then
		if [[ "$2" == "search" ]]; then
			[ "$VERBOSE" -eq 1 ] &&
				printf "%s\n" "Already in search db... Updating search_date"
		else
			[ "$VERBOSE" -eq 1 ] &&
				printf "%s\n" "Already in search db... Updating watch_date"
		fi
		update_date "$@"
	else
		if [[ "$2" == "search" ]]; then
			stmt="INSERT INTO search_history(anime_name, search_date) \
				VALUES('$1', '$datetime');"
			run_stmt "$stmt"
		else
			stmt="INSERT INTO \
				watch_history(anime_name, episode_number, watch_date) \
				VALUES('$1', '$2', '$datetime');"
			run_stmt "$stmt"
		fi
	fi
}

# get query
get_search_query() {
	# Query the anime to stream/download

	# Get search history
	# Construct string "<id>. <anime_name>"
	stmt="SELECT DISTINCT id || '. ' || anime_name \
		  FROM search_history \
		  ORDER BY id DESC;"
	hist=$(run_stmt "$stmt")

	msg="Choose from list of searched anime below, or enter a unique name of an anime to search for"
	span="<span foreground='peachpuff' style='italic' size='small' weight='light'>$msg</span>"
	if [ -z "$*" ]; then
		query=$(printf "%s\n" "${hist[@]}" |
			rofi -dmenu -l 12 -p "Search Anime:" \
				-mesg "$span" \
				-config "$CFG_DIR/${ROFI_CFG}")

		# Strip the list entry number from string
		query="${query//[1-9]\. /}"
		[ "$VERBOSE" -eq 1 ] && printf "%s\n" "Query: $query"
	else
		query=$*
	fi
}

# create history file
[ -f "$logfile" ] || : >"$logfile"

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

anime_selection() {
	# Select anime from query results
	search_results=$*
	menu_format_string='[%d] %s\n'
	menu_format_string_c1="$c_blue[$c_cyan%d$c_blue] $c_reset%s\n"
	menu_format_string_c2="$c_blue[$c_cyan%d$c_blue] $c_yellow%s$c_reset\n"

	count=1
	menu=()
	res=()
	while read anime_id; do
		# alternating colors for menu
		[ $((count % 2)) -eq 0 ] &&
			menu_format_string=$menu_format_string_c1 ||
			menu_format_string=$menu_format_string_c2

		# printf "$menu_format_string" "$count" "$anime_id"
		menu+="$count. $anime_id\n"
		idx=$((count - 1))
		res["$idx"]="$anime_id"
		count=$((count + 1))
	done <<-EOF
		$search_results
	EOF

	searched=""
	cnt=0
	# Get the comma separated list of indexes of anime that has been searched before
	for anime in "${res[@]}"; do
		[ "$VERBOSE" -eq 1 ] && printf "%s\n" "ANIME: $anime"
		check_db "$anime" "search"
		if [[ $? -gt 0 ]]; then
			[ "$VERBOSE" -eq 1 ] && printf "%s\n" "SEARCHED BEFORE"
			if [[ "$searched" == "" ]]; then
				searched="$((cnt++))"
			else
				searched="$searched, $((cnt++))"
			fi
		fi
	done

	[ "$VERBOSE" -eq 1 ] && printf "%s\n" "SEARCHED: $searched"

	# get the anime from indexed list
	user_input=$(printf "${menu[@]}" |
		rofi -dmenu -config "$CFG_DIR/${ROFI_CFG}" \
			-a "$searched" \
			-l 12 -i -p "Enter number:")
	[ "$?" -ne 0 ] && return 1

	choice=$(printf '%s\n' "$user_input" | awk '{print $1}')
	# Remove period after number
	choice="${choice::-1}"
	name=$(printf '%s\n' "$user_input" | awk '{print $NF}')

	if [[ "$VERBOSE" -eq 1 ]]; then
		printf "%s\n" "CHOICE: $name"
		printf "%s\n" "NAME: $name"
	fi

	# check both choice and name are set
	if [[ ! "$choice" ]] || [[ ! "$name" ]]; then
		die "Invalid choice... committing seppuku"
	fi
	# Check if input is a number
	[ "$choice" -eq "$choice" ] 2>/dev/null || die "Invalid number entered"

	insert_history "$name" "search"

	printf "$c_reset"

	# Select respective anime_id
	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"

	read last_ep_number <<-EOF
		$(search_eps "$selection_id")
	EOF
}

##################
## Ep selection ##
##################

episode_selection() {
	# select episode number for anime
	[ "$is_download" -eq 1 ] &&
		printf "Range of episodes can be specified: start_number end_number\n"
	[ "$VERBOSE" -eq 1 ] && printf "%s\n" "Anime ID: $anime_id"
	stmt="SELECT DISTINCT episode_number \
		  FROM watch_history \
		  WHERE anime_name = '$anime_id';"
	hist=$(run_stmt "$stmt")
	if [[ "$VERBOSE" -eq 1 ]]; then
		printf "%s\n" "HISTORY: ${hist[*]}"
	fi

	# Get Watch History for $anime_id as comma separated list
	watch_history=""
	for i in $hist; do
		if [[ "$watch_history" == "" ]]; then
			watch_history="$((--i))"
		else
			watch_history="$watch_history, $((--i))"
		fi
	done

	[ "$VERBOSE" -eq 1 ] && printf "WATCH HISTORY: %s\n" "$watch_history"
	# get user choice and set the start and end
	msg='<span foreground="peachpuff" style="italic" size="small" weight="light">Range of episodes can be provided as: START_EPISODE - END_EPISODE</span>'
	choice=$(
		seq 1 "$last_ep_number" |
			rofi -dmenu -l 12 \
				-a "$watch_history" \
				-p "Select Episode [1, $last_ep_number]:" \
				-mesg "$msg" \
				-config "$CFG_DIR/${ROFI_CFG}"
	)
	ep_choice_start=$(printf '%s\n' "${choice}" | awk '{print $1}')
	ep_choice_end=$(printf '%s\n' "${choice}" | awk '{print $NF}')
	[ "$VERBOSE" -eq 1 ] && printf "%s\n" "START: $ep_choice_start | END: $ep_choice_end"
	if [[ -z "$ep_choice_start" ]] && [[ -z "$ep_choice_end" ]]; then
		die "No episode range entered"
	fi
	# if only one episode was entered, set ep_choice_end to empty string so only selected episode plays
	# otherwise plays from ep 1 - ep_choice_start
	if [[ "$ep_choice_start" -eq "$ep_choice_end" ]]; then
		ep_choice_end=""
	fi

	# read ep_choice_start ep_choice_end
	printf "$c_reset"

}

open_episode() {
	anime_id=$1
	episode=$2
	ddir="$3"

	if [[ ! "$is_playlist" ]]; then
		# clear the screen
		printf '\x1B[2J\x1B[1;1H'
		if [[ $episode -lt 1 ]] || [[ $episode -gt $last_ep_number ]]; then
			err "Episode out of range"
			stmt="SELECT DISTINCT episode_number \
				FROM watch_history \
				WHERE anime_name = '$anime_id' \
				ORDER BY episode_number ASC;"
			# hist=$(echo "$stmt" | sqlite3 "$HISTORY_DB" | awk '{ if ( NR > 2 ) { print } }')
			hist=$(run_stmt "$stmt")
			if [[ "$VERBOSE" -eq 1 ]]; then
				echo "HISTORY: ${hist[*]}"
			fi
			episode=$(printf "%s\n" "${hist[@]}" |
				rofi -dmenu -l 12 -p "Choose Episode:" \
					-config "$CFG_DIR/${ROFI_CFG}")
			printf "$c_reset"
		fi
	fi

	[ "$VERBOSE" -eq 1 ] && printf "Getting data for episode %d\n" $episode

	insert_history "$anime_id" "$episode"

	dpage_url=$(get_dpage_link "$anime_id" "$episode")
	video_url=$(get_links "$dpage_url")

	case $video_url in
	*streamtape*)
		# If direct download not available then scrape streamtape.com
		BROWSER=${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

	if [ $is_download -eq 0 ]; then
		# write anime and episode number
		# sed -E "
		# 	s/^${selection_id}\t[0-9]+/${selection_id}\t$((episode + 1))/
		# " "$logfile" >"${logfile}.new" && mv "${logfile}.new" "$logfile"

		setsid -f $player_fn --http-header-fields="Referer: $dpage_url" "$video_url" >/dev/null 2>&1
	else
		printf "Downloading episode $episode ...\n"
		printf "%s\n" "$video_url"
		# add 0 padding to the episode name
		episode=$(printf "%03d" $episode)
		{
			cd "${ddir/ //}" || die "Could not enter directory $ddir"
			mkdir -p "$anime_id" || die "Could not create directory"
			cd "$anime_id" || die "Could not enter subdirectory $ddir/$anime_id"
			ffmpeg -headers "Referer: $dpage_url" -i "$video_url" \
				-codec copy "${anime_id}-${episode}.mkv" >/dev/null 2>&1 &&
				notify-send "Downloaded episode: $episode" ||
				notify-send "Download failed episode: $episode"
		}
	fi
}

############
# Start Up #
############

# to clear the colors when exited using SIGINT
trap "printf '$c_reset'" INT HUP

dep_ch "$player_fn" "curl" "sed" "grep" "sqlite3" "rofi"

# option parsing
is_download=0
list_history=0
scrape=query
download_dir="."
is_playlist=0
playlist_remove=0
playlist_add=0
playlist_file="$CFG_DIR/playlists/playlist.txt"
while getopts 'hd:HlpadP:' OPT; do
	case $OPT in
	h)
		help_text
		exit 0
		;;
	d)
		is_download=1
		download_dir="$OPTARG"

		if [ "$VERBOSE" -eq 1 ]; then
			echo "DOWNLOAD DIR: $download_dir"
		fi
		;;
	H)
		scrape=history
		;;
	l)
		list_history=1
		;;
	p)
		scrape=playlist
		is_playlist=1
		;;
	a)
		is_add=1
		scrape=add
		;;
	d)
		is_delete=1
		scrape=delete
		;;
	P)
		is_playlist=1
		# remove spaces from $OPTARG
		playlist_file="${OPTARG/ //}"
		[ -z "$playlist_file" ] && die "Enter in path to playlist"
		[ "$VERBOSE" -eq 1 ] && printf "%s\n" "$playlist_file"
		$player_fn "$playlist_file"
		exit 0
		;;
	esac
done
shift $((OPTIND - 1))

########
# main #
########

if [[ "$list_history" -eq 1 ]]; then
	stmt="SELECT DISTINCT anime_name \
		  FROM search_history \
		  ORDER BY search_date DESC"
	hist=$(run_stmt "$stmt")
	printf "%s\n" "${hist[@]}" |
		rofi -config "$CFG_DIR/${ROFI_CFG}" \
			-dmenu -l 12 -i -p "Search History"
	exit 0
fi

case $scrape in
query)

	get_search_query "$*"
	search_results=$(search_anime "$query")
	[ -z "$search_results" ] && die "No search results found"
	anime_selection "$search_results"
	[ $? -ne 0 ] && die "No anime selection found"
	episode_selection
	;;
history)
	# search_results=$(sed -n -E 's/\t[0-9]*//p' "$logfile")
	stmt="SELECT DISTINCT anime_name FROM watch_history ORDER BY watch_date DESC"
	search_results=$(printf "%s\n" "$stmt" | sqlite3 -noheader "$HISTORY_DB")
	[ -z "$search_results" ] && die "History is empty"
	anime_selection "${search_results[@]}"
	[ $? -ne 0 ] && die "No anime selection found"
	stmt="SELECT episode_number FROM watch_history ORDER BY watch_date DESC LIMIT 1"
	run_stmt "$stmt"
	ep_choice_start=$?
	echo "EPISODE: $ep_choice_start"
	# ep_choice_start=$(sed -n -E "s/${selection_id}\t//p" "$logfile")
	;;
playlist)
	lines=$(cat "$playlist_file" | wc -l)
	[ "$VERBOSE" -eq 1 ] && printf "%s%d\n" "Num lines in playlist: " "$lines"
	if [[ "$lines" -eq 0 ]]; then
		get_search_query "$*"
		search_results=$(search_anime "$query")
		[ -z "$search_results" ] && die "No search results found"
		anime_selection "$search_results"
		[ $? -ne 0 ] && die "No anime selection found"
		episode_selection
	else
		line=($(sed '1q;d' "$playlist_file"))
		if [[ "${#line[@]}" -ne 2 ]]; then
			die "Something went wrong with the playlist file... exiting"
		fi
		selection_id="${line[0]}"
		episodes=($selection_id)
		ep_choice_start="${line[1]}"
		ep_choice_end=""
		read last_ep_number <<-EOF
			$(search_eps "$selection_id")
		EOF
		[ "$VERBOSE" -eq 1 ] && printf "Anime: %s Episode: %d\n" "$episodes" "$ep_choice_start"
		[ "$VERBOSE" -eq 1 ] && printf "Episodes: %s\n" "${episodes[@]}"
	fi
	;;
add)
	get_search_query "$*"
	search_results=$(search_anime "$query")
	[ -z "$search_results" ] && die "No search results found"
	anime_selection "$search_results"
	[ $? -ne 0 ] && die "No anime selection found"
	episode_selection
	;;
delete) ;;

esac

{ # checking input
	[ "$ep_choice_start" -eq "$ep_choice_start" ] 2>/dev/null || die "Invalid number entered"
	episodes=$ep_choice_start

	if [ -n "$ep_choice_end" ]; then
		[ "$ep_choice_end" -eq "$ep_choice_end" ] 2>/dev/null || die "Invalid number entered"
		# create list of episodes to download/watch
		episodes=$(seq $ep_choice_start $ep_choice_end)
	fi
}

# add anime to history file
# grep -q -w "${selection_id}" "$logfile" ||
# 	printf "%s\t%d\n" "$selection_id" $((episode + 1)) >>"$logfile"

for ep in $episodes; do
	if [[ "$is_add" -eq 1 ]]; then
		if [[ "$VERBOSE" -eq 1 ]]; then
			printf "%s\n" "ID: $selection_id"
			printf "%s\n" "EPISODES: $episodes"
		fi
		printf "%s\n" "$selection_id $ep" >>"$playlist_file"
		[ "$VERBOSE" -eq 1 ] && printf "%s\n" "Added to playlist file"
		exit 0
	else
		open_episode "$selection_id" "$ep" "$download_dir"
		if [[ "$is_playlist" -eq 1 ]]; then
			sed -i '1d' "$playlist_file"
		fi
	fi
done
episode=${ep_choice_end:-$ep_choice_start}

choice=''
while :; do
	printf "\n${c_green}Currently playing %s episode ${c_cyan}%d/%d\n" "$selection_id" $episode $last_ep_number
	printf "$c_blue[${c_cyan}%s$c_blue] $c_yellow%s$c_reset\n" "n" "next episode"
	printf "$c_blue[${c_cyan}%s$c_blue] $c_magenta%s$c_reset\n" "p" "previous episode"
	printf "$c_blue[${c_cyan}%s$c_blue] $c_yellow%s$c_reset\n" "s" "select episode"
	printf "$c_blue[${c_cyan}%s$c_blue] $c_magenta%s$c_reset\n" "r" "replay current episode"
	printf "$c_blue[${c_cyan}%s$c_blue] $c_red%s$c_reset\n" "q" "exit"
	printf "${c_blue}Enter choice:${c_green} "
	printf "$c_reset"
	read choice

	printf "$c_reset"
	case $choice in
	n)
		episode=$((episode + 1))
		;;
	p)
		episode=$((episode - 1))
		;;

	s)
		printf "${c_blue}Choose episode $c_cyan[1-%d]$c_reset:$c_green " $last_ep_number
		read episode
		printf "$c_reset"
		[ "$episode" -eq "$episode" ] 2>/dev/null || die "Invalid number entered"
		;;

	r) ;;

	q)
		break
		;;

	*)
		die "invalid choice"
		;;
	esac
	open_episode "$selection_id" "$episode" "$download_dir"
done