#!/bin/bash

STATE_DIR="$(dirname $(readlink -f "$0"))/_state"
URLS=(
    'https://tmp.tobast.fr/testcurl'
)
PATTERNS=(
    '1'
)
MESSAGES=(
    'match'
)


function do_one {
    if [ "$#" -lt 4 ] ; then
        >&2 echo "Missing argument to do_one."
        return
    fi

    url="$1"
    pattern="$2"
    msg="$3"
    elt_id="$4"
    state_path="$STATE_DIR/$elt_id"

    curl -s "$url" | grep -q "$pattern"
    no_match="$?"

    if [ "$no_match" -eq 1 ]; then
        if [ -f "$state_path" ] ; then
            rm -f "$state_path"
        fi
    else # match
        if ! [ -f "$state_path" ] ; then  # no previous match
            echo "NEW MATCH: $msg"
            touch "$state_path"
        fi
    fi
}

if [ "${#URLS[@]}" -ne "${#PATTERNS[@]}" ] \
    || [ "${#URLS[@]}" -ne "${#MESSAGES[@]}" ]
then
    >&2 echo "Bad configuration: unbalanced number of elements"
    exit 2
fi
mkdir -p "$STATE_DIR"

for elt_id in "${!URLS[@]}"; do
    do_one \
        "${URLS[$elt_id]}" \
        "${PATTERNS[$elt_id]}" \
        "${MESSAGES[$elt_id]}" \
        "$elt_id"
done