#!/usr/bin/env bash

# Requires:
# * curl
# * fzf
# * jq
# * hq
# * youtube-dl
ttyecho(){
	# Same as echo but always to tty
	echo "$@" > /dev/tty
}

urlencodespecial() {
	# urlencode <string>
	old_lc_collate=$LC_COLLATE
	LC_COLLATE=C
	local length="${#1}"
	for (( i = 0; i < length; i++ )); do
		local c="${1:i:1}"
		case "$c" in
			[a-zA-Z0-9.~_-]) printf "$c" ;;
			' ') printf "+" ;;
			*) printf '%%%02X' "'$c" ;;
		esac
	done
	LC_COLLATE=$old_lc_collate
}

forceread(){
	# Read but always from tty and will keep asking until a non-empty value is
	# given
	# First param is given is prompt
	local answer=""
	local first="true"
	while [ -z "$answer" ]; do
		[ "$first" == "true" ] || ttyecho "Please provide an answer"
		first="false"
		ttyecho -n "$1: "
		read answer < /dev/tty
	done
	echo "$answer"
}

getSearchTerm(){
	# Uses fzf to get a search term
	# It will filter suggestions using youtube's autocomplete
	export -f getSearchSuggestions
	export -f urlencodespecial
	echo "" | fzf --bind 'change:reload:bash -c  "getSearchSuggestions {q}" || true' \
		--header="Search Suggestions" \
		--phony \
		--height=50% --layout=reverse
}

getSearchSuggestions(){
	# Takes a query and outputs the search suggestions that youtube makes
	query="$(urlencodespecial "$1")"
	curl "https://clients1.google.com/complete/search?client=youtube&hl=en&gl=gb&gs_rn=64&gs_ri=youtube&ds=yt&cp=5&gs_id=4e&q=$query&xhr=t&xssi=t" |
		tail -n 1 | jq -r '.[1][][0]'
}

performSearch(){
	# Returns the json object yt gives us
	local raw="$1"
	local url="https://www.youtube.com/results?search_query=$(urlencodespecial "$raw")"
	if type -p hq > /dev/null; then
		curl -s "$url" | hq script data | grep 'ytInitialData' | head -n 1 | grep -o '{.*}'
	elif type -p pup > /dev/null; then
		curl -s "$url" | pup script | grep 'ytInitialData' | head -n 1 | grep -o '{.*}'
	else
		curl -s "$url" | sed -e 's/<script[^>]*>/\n/g' -e 's/<\/script>/\n/g' | grep 'ytInitialData' | head -n 1 | grep -o '{.*}'
	fi

}

extractVideoInfo(){
jq '..|.videoRenderer?' | sed '/^null$/d' |
	jq -r '{title: .title.runs[0].text,
		channel: .longBylineText.runs[0].text,
		views: .shortViewCountText.simpleText,
		time: .lengthText.simpleText,
		age: .publishedTimeText.simpleText,
		video: .videoId
	}'
}

chooseVideo(){
	(echo -e "Title\tChannel\tViews\tTime\tAge\tId"
	jq -r '[ .title, .channel, .views, .time, .age, .video ] | @tsv') |
		column -t -s"	" | sed $'s/  \([^ ]\)/\u00a0\\1/g' |
		fzf --header-lines="1" --with-nth=1,2,3,4,5 --delimiter=$'\u00a0' 
}

chooseQuality(){
	videoId="$(cat - | awk -F $'\u00a0' '{print $6}')"
	code="$( (
		echo "bb          Best of Both"
		youtube-dl "$videoId" -F | sed -n '/format code/,$ p' | sed 1d;
	) | fzf --prompt "Quality " -m | cut -d ' ' -f 1 )"

	code="$(echo "$code" | tr '\n' '+' | sed 's/+$//')"

	case "$code" in
		"bb") mpv "https://www.youtube.com/watch?v=$videoId" --ytdl-format="bestvideo+bestaudio" ;;
		*) mpv "https://www.youtube.com/watch?v=$videoId" --ytdl-format="$code" ;;
	esac
}

main(){
	local searchTerm="$*"

	[ -z "$searchTerm" ] && searchTerm="$(getSearchTerm)"

	performSearch "$searchTerm" | extractVideoInfo | chooseVideo | chooseQuality
}

main "$@"