#!/bin/bash

# Functions
# Throw
function throw {
    >&2 echo "$1"
    exit "$2"
}

# Throw a value
function throw-value {
    throw "Invalid value for \"$1\": \"$2\"" "$3"
}

# Variables
selection_mode="$1"
saving_mode="$2"
screenshot_d="/tmp"
_command=()

# Command building
_command+=("maim")
case "$selection_mode" in
    "full")
        :
        ;;
    "area")
        _command+=("-s")
        ;;
    *)
        throw-value "selection mode" "$selection_mode" 1
        ;;
esac
case "$saving_mode" in
    "clip")
        _command+=("|")
        _command+=("xclip" "-selection" "clipboard" "-t" "image/png")
        ;;
    "file")
        _command+=(">" "${screenshot_d}/$(printf '%s-screenshot-%s.png' "$LOGNAME" "$(date +'%Y_%m_%d_%s')")")
        ;;
    *)
        throw-value "saving mode" "$saving_mode" 2
        ;;
esac

# Debug
#echo "${_command[@]}"
#exit 0

# Execution
"${_command[@]}"