#!/usr/bin/env sh
# compat: +ash +bash +dash -hush +ksh +mksh +oksh +osh -posh +yash +zsh
# hush either fails to output certain text or just segfaults.
# posh generally works, but has issues with escaping strings.

__notice_warn() {
	printf >&2 'notice: %s\n' "$*"
}

__notice_curl() {
	curl -q --no-progress-meter 127.255.255.255 >/dev/null 2>&1
	if [ $? = 2 ]
	then __notice_curl() { curl -fsS "$@"; }
	else __notice_curl() { curl -f --no-progress-meter "$@"; }
	fi
	__notice_curl "$@"
}

__notice_commaize() { # fun with POSIX shell
	while [ -n "$1" ]; do
		set -- "${1%???}" "${1#"${1%???}"},$2" "$1"
		if [ "$1" = "$3" ]; then
			set -- "" "$1$2"
			break
		fi
	done
	REPLY="${2%,}"
}

__notice_escape() {
	# doesn't work in posh. it doesn't like "${1%%[$2]*}", bug?
	# warning: mksh is O(n^2) with string length!
	# note: bash is horribly slow without `export LC_ALL=C`. zsh is fastest.
	set -- "" "" "$1" "$2"
	while :; do
		set -- "$1" "${3%%[$4]*}" "$3" "$4"
		[ "$2" != "$3" ] || break
		set -- "$1$2\\" "${3#"$2"}" "$3" "$4"
		set -- "$1${2%"${2#?}"}" "$2" "${2#?}" "$4"
	done
	REPLY="$1$3"
}

__notice_urlencode() {
	while test "$1"; do
		case "$1" in
		([a-zA-Z0-9~_.-]*) printf '%.1s' "$1";; # RFC 3986
		(*) printf '%%%02X' "'$1";; # bash complains but works
		esac
		set -- "${1#?}"
	done
} 2>&- # send bash's complaints to the abyss

__notice_urlencode2() {
	while test "$1"; do
		case "$1" in
		([:/a-zA-Z0-9~_.-]*) printf '%.1s' "$1";; # : and / added here
		(*) printf '%%%02X' "'$1";; # bash complains but works
		esac
		set -- "${1#?}"
	done
} 2>&- # send bash's complaints to the abyss

__notice_generate_id() {
	: "${1:?missing seed}"
	unset REPLY

	case "$1" in
		# when "$(date -u +%s)" is the argument, this will last until 2096.
		(*[!0-9]*) false;; (???????????*) false;; ([4-9]?????????) false;;
	esac || return

	# use REPLY as a temporary variable, since we'll overwrite it later anyway.
	REPLY="$(( (2250438373 * $1 + 1) & 4294967295 ))" # shuffle IDs
	# all this checking for negatives is due to mksh which overflows an i32.
	REPLY="$(( (REPLY < 0 ? REPLY + 216313691 : REPLY) % 815730721 ))"
	REPLY="$((  REPLY < 0 ? REPLY + 815730721 : REPLY ))"

	set -- "$REPLY"
	REPLY=
	while [ "${#REPLY}" -lt 8 ]; do
		case "$(($1%13))" in
		 (0) REPLY="${REPLY}a";;  (1) REPLY="${REPLY}c";;  (2) REPLY="${REPLY}e";;
		 (3) REPLY="${REPLY}m";;  (4) REPLY="${REPLY}n";;  (5) REPLY="${REPLY}o";;
		 (6) REPLY="${REPLY}r";;  (7) REPLY="${REPLY}s";;  (8) REPLY="${REPLY}u";;
		 (9) REPLY="${REPLY}v";; (10) REPLY="${REPLY}w";; (11) REPLY="${REPLY}x";;
		(12) REPLY="${REPLY}z";;
		esac
		set -- "$(($1/13))"
	done
}

__notice_log() {
	printf '## [%s](%s)\\n\\nUploaded %s byte%s to %s [(aux)](%s) with hashes:\\n* sha1sum: `%s`' \
	"$sanitized" "$normal" "$pretty" "$fancy" "$target" "$aux" "$sha1"
}

# __notice_upload_to_...
# (SLOW) com_cockfile          134217728+???     or  128 MiB (wtf is going on here)
# (slow) io_file              2000000000-200-4-x or 1907 MiB (untested)
#        sh_envs               536870912-200-4-x or  512 MiB (untested)
#        se_uguu                67108864-200-7-x or   64 MiB (tested)
#        org_c_net_paste        50000000         or   47 MiB (tested)
#        at_oshi              5000000000-200-1-x or 4768 MiB (untested)
#        net_filebin           unlimited?
#        com_bashupload      50000000000         or   47 GiB (untested)
# (fast) at_x0                 232783872-200-4-x or  222 MiB (tested) (used to be 100 MiB)
# (FAST) moe_catbox_litterbox 1000000000         or    1 GB  (untested)

# NOTE: for sites that use `curl -F` to upload, you automatically lose
#       at least 200 bytes to multipart form-data. names count toward this.

# EXAMPLE: curl -F files[]=@myfile https://example.com
#          let's say example.com advertises a file size limit of 1000 bytes.
#          you lose 200, then another 7 for "files[]", then another 6 for "myfile".
#          therefore the maximum size that "myfile" can be is instead 787.

# NOTE: i haven't tested double quotes in filenames yet;
#       perhaps they count as two bytes each - not sure.

__notice_compute_form_limit() {
	# usage: $0 {FIELD NAME} {FILE NAME} {FILE SIZE} {SIZE LIMIT}
	# returns 1 when over the limit.
	return "$(( ($3) + 200 + (${#1}) + (${#2}) > ($4) ))"
}

__notice_upload_to_org_c_net_paste() {
	target=paste.c-net.org
	# defaults: 180 days, permanent (remains after download)
	# TODO: retrieve deletion key from json response (see docs).
	# WARNING: there seems to be a bug where files with a hash collision
	#          are not uploaded, and you get someone else's file instead!
	[ "${bytes:-0}" -le 50000000 ] || return 128 # approx, untested
	raw="$(__notice_curl -g --data-binary "@$filepath" -H "X-FileName: ${1##*/}" "https://$target")" || return
	normal="https:${raw#*http*:}"; normal="${normal%%[!!-~]*}"
	aux="$normal"
}

__notice_upload_to_io_file() {
	target=file.io
	# defaults: 14 days, ephemeral (deletes after 1 download)
	# wget should use --content-disposition when downloading
	__notice_compute_form_limit "file" "${1##*/}" "${bytes:-0}" 2000000000 || return 128
	__notice_escape "$1" '\\"'
	raw="$(__notice_curl -F "file=@\"$REPLY\"" "https://$target")" || return
	[ "${raw#'{"success":true,"status":200,'}" ] || return
	normal="https:${raw#*\"link\":\"https:}"; normal="${normal%%[\"]*}"
	aux="$normal" # no direct link, i think it's based on User-Agent
}

__notice_upload_to_at_oshi() {
	target=oshi.at
	# defaults: 1 day, semi-permanent (remains up to 1000 downloads?)
	# configured: 14 days instead
	# TODO: retrieve admin URL from response (suffixed with " [Admin]")
	# NOTE: spaces are automatically converted (by the server) to underscores.
	__notice_compute_form_limit "f" "${1##*/}" "${bytes:-0}" 5000000000 || return 128
	__notice_escape "$1" '\\"'
	raw="$(__notice_curl -F "f=@\"$REPLY\"" -F expire=20160 "https://$target")" || return
	normal="https:${raw##*DL: http*:}"; normal="${normal%%[!!-~]*}"
	aux="$normal"
}

__notice_upload_to_com_bashupload() {
	target=bashupload.com
	# defaults: 3 days, ephemeral (deletes after 1 download)
	# it also seems to accept `-F file=blah` multipart form-data
	# note that filenames with spaces are treated as if no filename was given!
	# TODO: when name contains spaces, replace with underscores and append to URL?
	[ "${bytes:-0}" -le 50000000000 ] || return 128 # approx, untested
	# https://$target/${${1##*/}// /%20}
	raw="$(__notice_curl -gT "$1" "https://$target")" || return
	normal="https:${raw#*http*:}"; normal="${normal%%[!!-~]*}"
	aux="$normal?download=1"
}

__notice_upload_to_net_filebin() {
	target=filebin.net
	# defaults: 7 days, permament (but can be deleted by anyone with the link)
	# note that the site says 6 days, but this is rounded down. the API shows 7 days.
	# spaces are converted to underscores, and perhaps other characters are as well.
	# note that you need curl -L to retrieve the files; they redirect to an s3 store.
	__notice_generate_id "$(date -u +%s)" || return
	aux="https://$target/$REPLY"
	#raw="$(__notice_curl -gfT "$1" "$aux/$(__notice_urlencode ${1##*/})")" || return
	raw="$(__notice_curl -gT "$1" "$aux/")" || return
	normal="${raw##*\"filename\": \"}"; normal="$aux/${normal%%\"*}"
	# optional: lock the bin so nobody can edit it, but anyone can still delete it.
	curl -sSX PUT "$aux" >/dev/null || true
}

__notice_upload_to_at_x0() {
	target=x0.at
	# defaults: 100 days, permanent
	# note that file retention decreases as file size increases.
	# 100 MiB files are kept for 3 days, and 0 byte files are kept for 100 days.
	# filenames are randomized. cannot manually delete nor specify expiry.
	__notice_compute_form_limit "file" "${1##*/}" "${bytes:-0}" 232783872 || return 128
	__notice_escape "$1" '\\"'
	raw="$(__notice_curl -F "file=@\"$REPLY\"" "https://$target")" || return
	normal="$raw"
	aux="$normal"
}

__notice_upload_to_se_uguu() {
	target=uguu.se
	# defaults: 3 hours, permanent
	# filenames are randomized. cannot manually delete nor specify expiry.
	# TODO: use fixed filename to squeeze a couple more bytes out of the limit?
	__notice_compute_form_limit "files[]" "${1##*/}" "${bytes:-0}" 67108864 || return 128
	__notice_escape "$1" '\\"'
	raw="$(__notice_curl -F "files[]=@\"$REPLY\"" "https://$target/upload?output=text")" || return
	normal="$raw"
	aux="$normal"
}

__notice_upload_to_com_cockfile() {
	target=cockfile.com
	# defaults: 12 hours, permanent
	# filenames are randomized. cannot manually delete nor specify expiry.
	# must have a file extension or it gets rejected (415), so use `.bin`.
	__notice_compute_form_limit "files[]" ".bin" "${bytes:-0}" 999999999 || return 128
	__notice_escape "$1" '\\"'
	raw="$(__notice_curl -F "files[]=@$\"$REPLY\";filename=.bin" "https://$target/upload.php?output=text")" || return
	normal="$raw"
	aux="$normal"
}

__notice_upload_to_sh_envs() {
	target=envs.sh
	# configured: 14 days, permanent (TODO: add "defaults" to match other docs)
	# does not remember filenames in any capacity, BUT we can tack on our own to the URL.
	# you can delete files if you extract the X-Token field from the response HTTP headers.
	# banned MIME types: application/java-archive, application/java-vm
	__notice_compute_form_limit "file" "${1##*/}" "${bytes:-0}" 536870912 || return 128
	__notice_escape "$1" '\\"'
	raw="$(__notice_curl -F "file=@\"$REPLY\"" -Fsecret= -Fexpires=336 "https://$target")" || return
	aux="$raw"
	normal="$raw/${1##*/}"
}

__notice_upload_to_moe_catbox_litterbox() {
	target=litterbox.catbox.moe
	# defaults: 1 hour, permanent
	# configured: 3 days, permanent
	# filenames are randomized. cannot manually delete nor specify expiry.
	# SUPER fast. disallowed filetypes: .exe, .scr, .cpl, .doc*, .jar
	__notice_compute_form_limit "fileToUpload" "${1##*/}" "${bytes:-0}" 1000000000 || return 128
	__notice_escape "$1" '\\"'
	if [ "${1%.exe}" != "$1" ] || [ "${1%.scr}" != "$1" ]; then
		set -- "$1" "fileToUpload=@\"$REPLY\";filename=\"${REPLY%.???}.com\"" # bypass
	elif [ "${1%.cpl}" != "$1" ]; then
		set -- "$1" "fileToUpload=@\"$REPLY\";filename=\"${REPLY%.???}.dll\"" # bypass
	else
		set -- "$1" "fileToUpload=@\"$REPLY\""
	fi
	raw="$(__notice_curl -F "$2" -Ftime=72h -Freqtype=fileupload "https://$target/resources/internals/api.php")" || return
	normal="$raw"
	aux="$normal"
}

__notice_retrying() {
	case $? in
	(0) return 0;;
	# https://curl.se/libcurl/c/libcurl-errors.html
	(127)
		interrupt=1
		__notice_warn "interrupted, exiting."
		return 0;;
	(128)
		__notice_warn "file unsuitable for $target, skipping to next service..."
		return 1;;
	(*)
		__notice_warn "failed to upload to $target, trying next service..."
		return 1;;
	esac
}

__notice_upload() {
	unset REPLY aux bytes fancy file filepath interrupt normal pretty raw sanitized sha1 target
	file="${1:-missing argument}"

	file="$(readlink -f "$file")" || return 2 # also converts `\`s to `/`s
	# i have no idea why, but mingw64 curl on msys2 is replacing each unicode codepoint with a question mark.
	# the irony is that it seems to be properly decoding the UTF-8 encoding and then replacing it all anyway.
	[ -d /C ] && filepath="$(LC_ALL= cygpath -ws "$file")" || filepath="$file"

	REPLY="${file##*/}"
	# ksh and mksh dictate that the characters must be in this order:
	__notice_escape "$REPLY" '][!#()*+<>_`{|}\\\-' # removed '.' due to discord
	__notice_escape "$REPLY" '\\"'
	sanitized="$REPLY"

	bytes="$(du -b -- "$file")" || return 2
	sha1="$(sha1sum -- "$file")" || return 2
	bytes="${bytes%%[!!-~]*}"
	sha1="${sha1%%[!!-~]*}"

	__notice_commaize "$bytes"; pretty="$REPLY"
	test "$bytes" -ge 0 || return 2
	if [ "$bytes" -ge 10200547328 ]; then
		fancy="s ($(( (bytes + 536870912) / 1073741824)) GiB)"
	elif [ "$bytes" -ge 9961472 ]; then
		fancy="s ($(( (bytes + 524288) / 1048576)) MiB)"
	elif [ "$bytes" -ge 9728 ]; then
		fancy="s ($(( (bytes + 512) / 1024)) KiB)"
	elif [ "$bytes" -ne 1 ]; then
		fancy="s"
	fi

	REPLY=
	__notice_upload_to_sh_envs              "$file" || __notice_retrying ||
	__notice_upload_to_at_oshi              "$file" || __notice_retrying ||
	__notice_upload_to_net_filebin          "$file" || __notice_retrying ||
	__notice_upload_to_org_c_net_paste      "$file" || __notice_retrying ||
	__notice_upload_to_io_file              "$file" || __notice_retrying ||
	__notice_upload_to_moe_catbox_litterbox "$file" || __notice_retrying ||
	__notice_upload_to_com_bashupload       "$file" || __notice_retrying ||
	{
		__notice_warn "failed to upload to every service, exiting."
		return 1
	}
	[ "$interrupt" != 1 ] || return 127
	normal="$(__notice_urlencode2 "$normal")"
	aux="$(__notice_urlencode2 "$aux")"
	REPLY="$(__notice_log)"
	return 0
}

__notice_read_conf() {
	# TODO: ensure conf file is unreadable by others?
	while read -r line; do
		line="${line%%#*}" # strip comments
		line="${line#"${line%%[! ]*}"}" # strip left
		line="${line%"${line##*[! ]}"}" # strip right
		if [ "${line#gotify=}" != "$line" ]; then
			__notice_push_to_gotify "${line#*=}"
		elif [ "${line#discord=}" != "$line" ]; then
			__notice_push_to_discord "${line#*=}"
		elif [ -n "$line" ]; then
			__notice_warn "warning: ignoring line: $line"
		fi
	done < "$1"
}

__notice() {
	unset LC_ALL REPLY aux code conf extras line message normal title token url
	export LC_ALL=C
	conf="${XDG_CONFIG_HOME:-"$HOME/.config"}/notice.conf"
	lament() { printf >&2 %s\\n "$@"; }

	url='https://eaguru.guru/gotify/message?token='
	if ! [ -e "$conf" ] && [ -e ~/.gotify.secret ]; then
		lament 'notice: warning: ~/.gotify.secret is being phased out in favor of'
		lament '        '"$conf"' containing a list of URLs:'
		lament '        gotify=https://example.com/gotify/message?token=secret'
		read -r token <~/.gotify.secret
	fi

	if [ $# != 1 ] && [ $# != 2 ]; then
		lament 'usage:'
		printf >&2 '  %s %s\n' "$0" '{message}' "$0" '{title} {message}' "$0" '@{file}'
		return 64
	fi

	[ $# != 2 ] || { title="$1"; shift; }
	message="${1:?missing message}"
	if [ $# = 1 ] && [ "${message#@}" != "$message" ]; then
		__notice_upload "${message#@}" || return
		lament "$normal"
	fi

	if [ -e "$conf" ]; then
		__notice_read_conf "$conf"
	elif [ -n "$token" ]; then
		__notice_push_to_gotify "$url$token"
	fi
}

__notice_push_to_gotify() {
	url="${1%%\?*}"
	set -- -qLo /dev/null -w '%{http_code}' "$@"
	if [ -n "$REPLY" ]; then
		extras='{"client::display": {"contentType": "text/markdown"}, "client::notification": {"click": {"url": "'"$aux"'"}}}'
		set -- "$@" --data '{"title": "New file uploaded", "message": "'"$REPLY"'", "extras": '"$extras"'}'
		set -- "$@" -H 'Content-Type: application/json'
	else
		[ -z "$title" ] || set -- "$@" --form-string "title=$title"
		[ -z "$message" ] || set -- "$@" --form-string "message=$message"
	fi
	set -- "$@" -H "Accept: application/json"

	if code="$(__notice_curl "$@")" && [ "$code" = 200 ]; then
		:
	else
		__notice_warn "failed to push message to $url (\$code=$code, \$?=$?)"
		return 1
	fi
}

__notice_push_to_discord() {
	# flags: 2 (SUPPRESS_EMBEDS)
	url="${1%%\?*}"
	set -- -qLo /dev/null -w '%{http_code}' "$@"
	if [ -n "$REPLY" ]; then
		set -- "$@" --data '{"content": "# New file uploaded\n\n'"$REPLY"'", "flags": 2}'
	elif [ -z "$title" ]; then
		set -- "$@" --data '{"content": "'"$message"'", "flags": 2}'
	elif [ -z "$message" ]; then
		set -- "$@" --data '{"content": "# '"$title"'", "flags": 2}'
	else
		set -- "$@" --data '{"content": "# '"$title"'\n\n'"$message"'", "flags": 2}'
	fi
	set -- "$@" -H 'Content-Type: application/json'
	set -- "$@" -H "Accept: application/json"

	if code="$(__notice_curl "$@")" && { [ "$code" = 200 ] || [ "$code" = 204 ]; }; then
		:
	else
		__notice_warn "failed to push message to ${url%/*} (\$code=$code, \$?=$?)"
		return 1
	fi
}

notice()(__notice "$@")
[ -n "${preload+-}" ] || __notice "$@"

# cursed modeline:
# vim:ft=bash ts=3 sw=3 noet sts=3