#!/usr/bin/env bash
# Take a screenshot of a selected area and upload it somewhere.
#
# Requires:
# * scrot
# * xclip

### CHANGE THESE FUNCTIONS:

upload() {
    # Given a filepath and a target name, upload the screenshot
    chmod +r "$1"
    scp "$1" "tyrelsouza.com:/www/tyrel.pw/s/$2"
}

url() {
    # Given a target name, echo the expected URL of the uploaded screenshot
    echo "https://tyrel.pw/s/$1"
}

### (End)

screenshot() {
    if $(which maim &> /dev/null); then
        maim $1 || return -1
    elif $(which scrot &> /dev/null); then
        scrot -s $1 || return -1
    elif $(which screencapture &> /dev/null); then
        screencapture -i $1 || return -1
    else
        echo "No screenshot utility found. Install scrot."
        return -1
    fi
}

clipboard() {
    if $(which xclip &> /dev/null); then
        echo $1 | xclip -r -selection clipboard
    elif $(which pbcopy &> /dev/null); then
        echo $1 | pbcopy
    else
        echo "No clipboard utility found. Install xclip."
        return -1
    fi
}

notify() {
    if $(which osascript &> /dev/null); then
        osascript -e "display notification \"$2\" with title \"$1\""
    elif $(which notify-send &> /dev/null); then
        notify-send "$1" "$2"
    else
        echo "Notification not supported, skipped: $1: $2"
        return -1
    fi
}

fail() {
    echo "$2"
    exit $1
}

# Fail early
set -e

# If a path is given, use that instead of taking a screenshot
target="$1"

name="$(date '+%d')"
tmppath="$(mktemp -t ss.XXXX.png)" || fail 1 "failed to allocate a temporary file"

# Make it hard to guess
random_string=$(head -c512 /dev/urandom | shasum | head -c4)

# Compose full filename
filename="${name}_${random_string}.png"

if [[ "${target}" ]]; then
    cp -p "${target}" "${tmppath}"
else
    # Take the screenshot
    screenshot "${tmppath}" || fail 2 "failed to take screenshot"
fi

# Clear clipboard
clipboard " "

# Upload it
url=$(url "${filename}")
echo "Uploading: $url"
upload "${tmppath}" "${filename}" && rm "${tmppath}" || fail 3 "failed to upload ${tmppath}"

# Copy to clipboard
clipboard "${url}"
echo "Copied to clipboard."

# Clean up
if [[ -f "${tmppath}" ]]; then
    rm "${tmppath}"
fi

notify "Uploaded Screenshot" "${url}"