#!/bin/sh

# This software is released into the public domain.
# It is provided "as is", without warranties or conditions of any kind.
# Anyone is free to use, modify, redistribute and do anything with this software.

# requires: POSIX sh, curl, tr

# To use service other than https://sicp.me/, set the environmental variable
# SICPLOAD_SERVICE to the upload/paste endpoint URL for that service or
# uncomment and set the following line:
#SICPLOAD_SERVICE=https://[your service here]/

# To auto-authenticate without having to use the -U flag, either set the
# environmental variable SICPLOAD_UUID or uncomment and set the following line:
#SICPLOAD_UUID=[your UUID here]

###############################################################
# do not edit below this line unless you know what you're doing
###############################################################

default_service="${SICPLOAD_SERVICE:-"https://sicp.me/"}"
service="$default_service"
uuid="${SICPLOAD_UUID:-}"
prog="$(basename "$0")"
paste=0
stdin=1
lang=

usage() {
	printf "Usage: %s < file\n" "$prog"
	printf "       command | %s\n" "$prog"
	printf "       %s file1 file2 file3 ...\n" "$prog"
	printf "\n"
	printf "Options (applies for all files following the flag):\n"
	printf "  -S,  --service=ADDR  uses ADDR as the service URL instead of %s\n" "$default_service"
	printf "  -U,  --uuid=UUID     uses UUID for authentication with the service\n"
	printf "  -u,  --upload        upload files from this flag on to the file hosting service (default)\n"
	printf "  -p,  --paste         paste files from this flag on to the pastebin\n"
	printf "  -l,  --lang=LANG     syntax highlight using language LANG (implies -p)\n"
	printf "  -l-, --lang=-        guess language to highlight (inaccurate) (implies -p)\n"
	printf "  -L,  --lang=         do not highlight paste, serve raw plaintext (implies -p)\n"
	printf "  -h,  --help          display this help and exit\n"
	printf "  --                   stop processing options and treat all following arguments as filenames\n"
	printf "\n"
	printf "Example: %s foo -lsh bar -u baz -p quux -L qwe asd\n" "$prog"
	printf "  will post 'foo' and 'baz' as files, 'bar' and 'quux' as .sh pastes and 'qwe' and 'asd' as raw pastes\n"
}

upload() {
	file=""
	auth=""
	if [ $# -ge 1 ]; then
		filename="$(basename "$1" | tr -c -d 'a-zA-Z0-9_?.+=!@#$%^&*()[]{} -')"
		if [ -n "$filename" ]; then
			file=";filename=$filename"
		fi
	fi
	if [ -n "$uuid" ]; then
		auth="-F uuid=$uuid"
	fi
	#shellcheck disable=SC2086
	if [ "$paste" -ne 0 ]; then
		if [ -n "$lang" ]; then
			url="$(curl -sS $auth -F "lang=$lang" -F "paste=<-" "$service")"
		else
			url="$(curl -sS $auth -F "paste=<-" "$service")"
		fi
	else
		url="$(curl --progress-bar $auth -F "file=@-$file" "$service")"
	fi
	case "$url" in
		http*)
			printf "%s\n" "$url"
			;;
		?*)
			printf "%s: error: %s\n" "$prog" "$url" >&2
			return 1
			;;
		"")
			printf "%s: error: received an empty response from the service\n" "$prog" >&2
			return 1
			;;
	esac
}

upload_file() {
	#shellcheck disable=SC2094
	if ! url="$(upload "$1" < "$1")"; then
		exit 1
	fi
	printf "%s: %s\n" "$1" "$url"
}

while [ $# -gt 0 ]; do
	case "$1" in
		-h|--help)
			usage
			exit
			;;

		-u|--upload)
			paste=0
			;;

		-p|--paste)
			paste=1
			;;

		-l|--lang)
			if [ $# -ge 2 ]; then
				lang="$2"
				shift
			else
				printf "%s: option '%s' requires an argument\n" "$prog" "$1" >&2
				exit 2
			fi
			paste=1
			;;

		-l?*)
			lang="${1#??}"
			paste=1
			;;

		--lang=*)
			lang="${1#*=}"
			paste=1
			;;

		-L)
			lang=
			paste=1
			;;

		-U|--uuid)
			if [ $# -ge 2 ]; then
				uuid="$2"
				shift
			else
				printf "%s: option '%s' requires an argument\n" "$prog" "$1" >&2
				exit 2
			fi
			;;

		-U?*)
			uuid="${1#??}"
			;;

		--uuid=*)
			uuid="${1#*=}"
			;;

		-S|--service)
			if [ $# -ge 2 ]; then
				service="$2"
				shift
			else
				printf "%s: option '%s' requires an argument\n" "$prog" "$1" >&2
				exit 2
			fi
			;;

		-S?*)
			service="${1#??}"
			;;

		--service=*)
			service="${1#*=}"
			;;

		--)
			shift
			break
			;;

		-?*)
			printf "%s: unrecognized option '%s'\n" "$prog" "$1" >&2
			exit 2
			;;

		*)
			stdin=0
			upload_file "$1"
			;;
	esac

	shift
done

while [ $# -gt 0 ]; do
	stdin=0
	upload_file "$1"
	shift
done

if [ "$stdin" -ne 0 ]; then
	upload
	exit $?
fi