#!/bin/sh

# get configuration & data directories
DATA="$HOME/.cache/trss"
CONFIG="$HOME/.config/trss"
MODE=""

# make sure these directories are in place
mkdir -p "$DATA"
mkdir -p "$CONFIG"

import_information () {
	FEEDS=""
	for i in "$CONFIG"/*; do
		. "$i"
		[ -z "$FEEDS" ] && FEEDS="$NAME" || FEEDS="$FEEDS $NAME"
	done
}

sync_individual () {
	url="$(get_feed_attr "$1" feed)"
	printf "> synchronizing feed %s via url %s\n" "$1" "$url"
	curl "$url" -so "$DATA/${1}.xml"

	# generate sfeed formatted file
	printf "> creating sfeed compound feed file for feed %s\n" "$1"
	cat "$DATA/${1}.xml" |
		sfeed |
		cat - "$DATA/${1}.sfeed" |
		sort -u |
		sort -r -k 1 >> "$DATA/${1}.tmp.sfeed"
	mv "$DATA/${1}.tmp.sfeed" "${DATA}/${1}.sfeed"
}

synchronize () {
	for i in $FEEDS; do
		sync_individual "$i"
	done
}

get_feed_attr () {
	eval "printf '%s' \${$1_$2}"
}

cli_loop () {
	read -p "$MODE\$ " input
	case "$input" in
		"ls"*)
			ls_handler $input
			;;
		"cd"*)
			cd_handler $input
			;;
		"cat"*)
			cat_handler $input
			;;
		"sync"*)
			sync_handler $input
			;;
		"open"*)
			open_handler $input
			;;
	esac
}

ls_handler () {
	if [ -z "$MODE" ]; then
		# just list all the feeds
		for i in $FEEDS; do
			printf "%s\n" "$i"
		done
	else
		# we have to list all the items in the feed
		# check first if feed is downloaded
		if [ -f "$DATA/${MODE}.sfeed" ]; then
			awk -F'\t' '{ print $2 }' "$DATA/${MODE}.sfeed"
		else
			printf "synchronization of feed %s required\n" "$MODE"
		fi
	fi
}

cd_handler () {
	if [ -z "$MODE" ]; then
		# we're in the home state
		[ -z "$2" ] && return
		[ "$2" = ".." ] && return

		# check if $2 is a valid feed
		j=0
		for i in $FEEDS; do
			[ "$2" = "$i" ] && j=1
		done

		if [ "$j" -ne 1 ]; then
			printf "trss: couldn't find feed %s\n" "$2"
			return
		fi

		# set the $MODE to the feed
		MODE="$2"
	else
		# we're in an individual feed
		[ -z "$2" ] && MODE="" && return
		[ "$2" = ".." ] && MODE="" && return

		printf "trss: couldn't find feed %s\n" "$2"
	fi
}

sync_handler () {
	force=0
	[ "$2" = "-f" ] && force=1
	[ "$3" = "-f" ] && force=1

	if [ -z "$MODE" ]; then
		# sync everything
		synchronize
	else
		[ -n "$2" ] && [ ! "$2" = "-f" ] &&
			sync_individual "$2" ||
			sync_individual "$MODE"
	fi
}

open_handler() {
	realargs="$(printf '%s\n' "$@" | tr '\n' ' ' | sed 's/^open //g')"
	[ -z "$MODE" ] && printf "couldn't find entry matching %s\n" "$realargs"
	results="$(awk -F'\t' -v pat="$realargs" '$2 ~ pat { print $0 }' "$DATA/${MODE}.sfeed")"

	OLDIFS="$IFS"
	IFS="
"

	for i in $results; do
		url="$(printf "%s" "$i" | awk -F'\t' '{ print $3 }')"

# on low power systems mpv can be expensive to run
# have to figure out why it stutters so much more than the browser
#		case "$url" in
#			*youtube*)
#				mpv "$url"
#				;;
#			*)
#				fire "$url" &
#				;;
#		esac
		fire "$url" &

	done
	IFS="$OLDIFS"
}

cat_handler () {
	realargs="$(printf '%s\n' "$@" | tr '\n' ' ' | sed 's/^cat //g;s/ $//g')"
	[ -z "$MODE" ] && printf "couldn't find entry matching %s\n" "$realargs"
	results="$(awk -F'\t' -v pat="$realargs" '$2 ~ pat { print $0 }' "$DATA/${MODE}.sfeed")"

	OLDIFS="$IFS"
	IFS="
"

	for i in $results; do
		entry="$(printf "%s" "$i" | awk -F'\t' '{ print $4 }')"

		printf "%s\n" "$entry" |
			sed -e 's|\\n|\n|g' -e 's|\\t|\t|g' |
			lynx -stdin
	done
	IFS="$OLDIFS"
}

import_information
while true; do
	cli_loop
done