#!/usr/bin/env bash
# shellcheck disable=SC2154
NOTIFICATION_PROGRAM='mako
'
process_args() {
    while [ "$#" -ge 2 ]; do
        printf -v "$1" "%s" "$2"
        shift
        shift
    done
}

escape() {
    local string
    string=$1
    string=${string//"<"/"&lt;"}
    string=${string//">"/"&gt;"}
    string=${string//"&"/"&amp;"}
    printf "%s" "$string"
}

# Just quit this application if our notification program does not exist
# With this notification will not be displayed on my work laptop. Avoid
# notification pollution!
check_notification_program() {
    if ! command -v "$NOTIFICATION_PROGRAM"; then
        exit 0
    fi
}

main() {
    options=(--app-name=cmus --transient -u low)
    filename=${file##*/}
    path=${file%/*}

    if [[ -f "${path}/cover.png" ]]; then
        options+=(-i "${path}/cover.png")
    fi

    if [[ -f "${path}/cover.jpg" ]]; then
        options+=(-i "${path}/cover.jpg")
    fi

    ## Get title or filename
    title=${title:-$filename}
    if [[ ${#title} -gt 25 ]]; then
        title="${title:0:24}…"
    fi
    title="<b>$title</b>"

    if [ -n "$artist" ]; then
        if [[ ${#artist} -gt 22 ]]; then
            artist="${artist:0:21}…"
        fi
        printf -v l_artist "<span size='x-large'>by </span>%s" "$(escape "$artist")"
    fi

    if [ -n "$date" ]; then
        date="${date%%-*}"
    fi

    # Get Album
    if [ -n "$album" ]; then
        if [[ ${#album} -gt 19 ]]; then
            album="${album:0:19}…"
        fi
        printf -v l_album "<span size='x-large'>on </span>%-20s <span size='x-large'>%s</span>" "$(escape "$album")" "${date:-}"
    fi

    printf -v l_intro "<span variant='small-caps'>cmus:<b>%s</b></span>" "$(escape "$status")"
    printf -v body "%s\n" "${l_intro:-}" "${title:-}" "${l_artist:-}" "${l_album:-}"
    notify-send "${options[@]}" "useless" "$body"
}

check_notification_program
process_args "$@"
main