#!/bin/bash

## Send a notification with NTFY and check if the config file is complete

if [[ "$UID" == "0" ]]; then
    NTFY_CONFIG_FILE="/etc/ntfy/ntfy.conf"
else
    NTFY_CONFIG_FILE=~/.config/ntfy/ntfy.conf
fi

SERVER="https://ntfy.0k.io/"

if ! [ -e "$NTFY_CONFIG_FILE" ]; then
    mkdir -p "${NTFY_CONFIG_FILE%/*}"
    ## default option to change if needed
    echo "SERVER=$SERVER" > "$NTFY_CONFIG_FILE"
elif ! grep -q "^SERVER=" "$NTFY_CONFIG_FILE"; then
    echo "SERVER=$SERVER" >> "$NTFY_CONFIG_FILE"
fi

source "$NTFY_CONFIG_FILE"

for var in SERVER LOGIN PASSWORD; do
    if ! [ -v "$var" ]; then
        echo "Error: missing $var in $NTFY_CONFIG_FILE"
        exit 1
    fi
done


exname=${0##*/}
channel="main" 

usage="Usage: $exname [-c CHANNEL] [-t TITLE ] MESSAGE 
----------------------------------------------
--- Send MESSAGE with TITLE to the specified CHANNEL. ---
----------------------------------------------
If no CHANNEL is provided, the message will be sent to the default channel
Default CHANNEL is format as follow : ConfiguredLOGIN_${default_channel}
If no TITLE is provided, the message will be sent with the hostname as title."

while [[ $# -gt 0 ]]; do
    arg="$1"
    shift 
    case "$arg" in
        -h|--help)
            echo "$usage"
            exit 0
            ;;
        -c|--channel)
            channel="$1"
            [ -z "$channel" ] || {
                echo "Error: no argument for channel option." >&2
                echo "$usage" >&2
                exit 1
            }
            shift 
            ;;
        -t|--title)
            title="$1"
            [ -z "$title" ] || {
                echo "Error: no argument for title option." >&2
                echo "$usage" >&2
                exit 1
            }
            shift 
            ;;
        *)  
            [ -z "$message" ] && { message="$arg"; continue; }
            echo "Error : Unexpected positional argument '$arg'." >&2
            echo "$usage" >&2
            exit 1
            ;;
    esac
done

[ -n "$message" ] || {
    echo "Error: missing message." >&2
    echo "$usage" >&2
    exit 1
}

curl_opts=(
    -s 
    -u "$LOGIN:$PASSWORD"
    -d "$message"
)

if [ -n "$title" ]; then
    curl_opts+=(-H "Title: [$(hostname)] $title")
fi

curl "${curl_opts[@]}" "$SERVER/${LOGIN}_$channel" > /dev/null