#!/usr/bin/env bash
# Copyright (c) 2012 fbt <fbt@fleshless.org>
#
# About:
# A simple upload script for ZFH (http://zerofiles.org)

_self="${0##*/}"

cfg_url_regex='^[A-Za-z]([A-Za-z0-9+.-]+)?://.+'
cfg_tmp_dir="/tmp/$USER/sup"; TEMPDIR="$cfg_tmp_dir"
cfg_script_url='https://zfh.so/upload'
cfg_screenshot_ext='png'

[[ -f $HOME/.suprc ]] && { source "$HOME/.suprc"; }

_cat() {
	while read; do
		printf '%s\n' "$REPLY"
	done
}

sup.msg() { printf '%s\n' "[sup] $1"; }
sup.err() { sup.msg "(error) $1" >&2; }

sup.usage() {
	_cat <<- EOF
		Usage: ${_self} [-RsF] [-D num] [file/url]"
		    Flags:
		        -R                   # Remove the file after uploading.
		        -s                   # Make a screenshot and upload it instead of a file.
		        -F                   # Make a fullscreen shot instead of prompting for a window/area. Implies -s.
		        -D <num>             # Delay the shot by <num> seconds.
		        -p                   # Make the file private. Requires \$secret to be set in the config.
		
		    Config options (~/.suprc):
		        secret               # Your personal token. Get it at https://zfh.so/settings_form
		        cfg_screenshot_ext   # Screenshot file type, used by scrot.
		        # Others are self-explanatory:
		        cfg_url_regex
		        cfg_tmp_dir
		        cfg_script_url
	EOF
}

sup.env() {
	for i in "$cfg_tmp_dir"; do
		[[ -d "$i" ]] || { mkdir -p "$i"; }
	done
}

sup.upload() {
	curl -F file="@$file" \
		-F upload_mode='api' \
		-F flag_private="$flag_private" \
		-F secret="$secret" \
		-F submit="" \
		"$cfg_script_url" -sL -A 'zerofiles.org upload script' || { return 1; }

	(( "$flag_rm" )) && { rm "$file"; }

	return 0
}

sup.mktemp() {
	>"$1" || {
		sup.err "Cannot create $1!"
		return 1
	}

	printf '%s\n' "$1"
}

sup.scrot() {
	declare tmp_file

	[[ "$scrot_exec" ]] || { scrot_exec=$(type -P scrot); }
	[[ "$scrot_exec" ]] || {
		sup.err "Please install scrot to use this function"
		return 1
	}

	(( "$flag_scrot_fullscreen" )) || { scrot_args+=( '-s' ); }
	[[ "$cfg_scrot_delay" ]] && { scrot_args+=( "-d $cfg_scrot_delay" ); }

	tmp_file="$(sup.mktemp "${cfg_tmp_dir}" ".${cfg_screenshot_ext}")"

	scrot "${scrot_args[@]}" "$tmp_file" || {
		sup.err "Failed to take a screenshot."
		return 1
	}

	printf '%s\n' "$tmp_file"
}

sup.if_url() { printf '%s\n' "$1" | grep -oE "$cfg_url_regex" &>/dev/null; }

sup.mktemp() {
	declare tmp_file_name tmp_file_name_extra="$2" tmp_dir="$1" 

	[[ -d "$tmp_dir" ]] || {
		sup.err "${tmp_dir} does not exist or is not a directory."
		return 1
	}

	until [[ ! -e "${tmp_dir}/${tmp_file_name}" ]]; do
		tmp_file_name="${RANDOM}${RANDOM}${tmp_file_name_extra}"
	done

	printf '%s\n' "${tmp_dir}/${tmp_file_name}"
}

sup.set_argv() {
	declare arg opt c
	declare -g argv

	while (( $# )); do
		unset -v arg opt c

		case "$1" in
			(--) argv+=( "$1" ); break;;

			(--*)
				IFS='=' read arg opt <<< "$1"
				argv+=( "$arg" )

				[[ "$opt" ]] && {
					argv+=( "$opt" )
				}
			;;

			(-*)
				while read -n1 c
				do
					case "$c" in
						-|'') :;;
						*) argv+=( "-$c" );;
					esac
				done <<< "$1"
			;;

			(*) argv+=( "$1" );;
		esac
		shift
	done
}

main() {
	declare args file target flag_private flag_rm flag_scrot flag_scrot_fullscreen cfg_scrot_delay

	while [[ "$1" ]]; do
		case "$1" in
			-p|--private) flag_private='true';;
			-R|--remove-file) flag_rm='1';;
			
			-s|--screenshot) flag_scrot='1';;
			-D|--screenshot-delay) cfg_scrot_delay="$2"; shift;;
			-F|--fullscreen)
				flag_scrot='1'
				flag_scrot_fullscreen='1'
			;;
			
			-h|--help|--usage) sup.usage; return;;

			--) shift; break;;

			*) break;;
		esac
		shift
	done

	sup.env

	if (( flag_scrot )); then
		file=$(sup.scrot) || { return 1; }
	else
		(( $# )) || {
			sup.usage
			return 1
		}

		target="$1"

		if sup.if_url "$target"; then
			file=$(sup.mktemp "$cfg_tmp_dir")

			curl -skL "$target" > "$file" || {
				sup.err "Could not download file."
				return 1
			}
		else
			file="$target"

			[[ -f "$file" ]] || {
				sup.err "No such file: ${file}"
				return 1
			}
		fi
	fi

	sup.upload
}

sup.set_argv "$@"
main "${argv[@]}"