#!/bin/sh -e

web_handler()
{
    # Choose a random invidious instance to distribute load.
    # Good digital citizenship is important, you know.
    rand_inst()
    {
	case $(($(rand)%6)) in
	    0) printf "vid.puffyan.us"           ;;
	    1) printf "inv.riverside.rocks"      ;;
	    2) printf "invidious.kavin.rocks"    ;;
	    3) printf "invidious-us.kavin.rocks" ;;
	    4) printf "invidious.osi.kr"         ;;
	    5) printf "invidio.xamh.de"          ;;
	esac
    }

    case "${1}" in
	*youtu*) exec Links "$(printf "%s" "${1}"|sed -ne \
			   "s&\(http.*://\).*\(/.*\)&\1$(rand_inst)\2&p")" & ;;
	*reddit*) exec Links "$(printf "%s" "${1}"|sed -ne \
			   "s&\(http.*://\).*\(/.*/\)&\1libredd.it\2&p")" &  ;;
	*4chan.org*) exec Links "$(printf "%s" "${1}"|sed -ne \
			      "s&4chan&4channel&p")" &                       ;;
	*) exec Links "${1}" & ;;
    esac
}


local_handler()
{
    cleanse_prefix()
    {
	printf "%s" "$(echo "${1}" | sed -ne 's&file://&&p')"
    }

    target="$(cleanse_prefix "${1}")"
    mime="$(file --mime-type -b "${target}")"

    case ${mime} in
	*html*) exec Links "${target}" &  ;;
	text*)  exec xless "${target}" &  ;;
	video*) exec fpv   "${target}" &  ;;
	audio*) exec fpm   "${target}" &  ;;
	image*) exec iview "${target}" &  ;;
	*pdf)   exec gv    "${target}" &  ;;
	*) edgecase                  ;;
    esac
}


edgecase()
{
    err()
    {
	printf "Plumber wasn't able to find a way to handle the following URI.\n%s\n" "${1}"
    }

    # If first character is / or a ~ and it exists, we're dealing with local data.
    firstchar=$(echo"${1}"|cut -b1)
    if [ "${firstchar}" = '~' || "${firstchar}" = '/' ]
    then
	local_handler "${1}"
    else
	err "${1}"
    fi

}

# Commented lines will have support in the future.
case "$(printf "%s" "${1}"|cut -b 1,2,3,4)" in
    #    gopher) err "${@}"      ;;
    http)   web_handler "${@}"   ;;
    file)   local_handler "${@}" ;;
    #    ftp)    err "${@}"      ;;
    #    ssh)    err "${@}"      ;;
    *)      edgecase "${2}"      ;;
esac

exit