#!/bin/bash
# Daily watch on sciCORE's open-positions page.
# Sends a Telegram message ONLY when a new line mentioning "software" appears.
# Other changes are logged silently so the snapshot stays current.
# Credentials come from .env: TELEGRAM_BOT_TOKEN, TELEGRAM_CHAT_ID

set -uo pipefail

REPO="/Users/polux/Projetos/linkme"
URL="${SCICORE_URL:-https://scicore.unibas.ch/about-scicore/open-positions/}"   # override for testing
WANTED="software"   # only changes mentioning this word are sent
STATE="$REPO/results/.scicore-watch"
SNAP="$STATE/snapshot.txt"
FAILS="$STATE/consecutive-failures"
LOG="$STATE/watch.log"
UA="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36"

mkdir -p "$STATE"

# shellcheck disable=SC1091
# accepts either TELEGRAM_BOT_TOKEN= or the shorter TELEGRAM_BOT=
TELEGRAM_BOT_TOKEN=$(grep -E '^TELEGRAM_BOT(_TOKEN)?=' "$REPO/.env" 2>/dev/null | head -1 | cut -d= -f2-)
TELEGRAM_CHAT_ID=$(grep -E '^TELEGRAM_CHAT_ID=' "$REPO/.env" 2>/dev/null | cut -d= -f2-)

log() { echo "$(date '+%Y-%m-%d %H:%M:%S') $*" >> "$LOG"; }

notify() {
  local text="$1"
  if [ -z "$TELEGRAM_BOT_TOKEN" ] || [ -z "$TELEGRAM_CHAT_ID" ]; then
    log "NOTIFY SKIPPED (no telegram creds in .env): $text"
    return 1
  fi
  local code
  code=$(curl -s -o "$STATE/last-telegram-response.json" -w '%{http_code}' \
    "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
    --data-urlencode "chat_id=${TELEGRAM_CHAT_ID}" \
    --data-urlencode "text=${text}" \
    --data-urlencode "disable_web_page_preview=true")
  log "telegram http $code"
  [ "$code" = "200" ]
}

HTML=$(curl -s --max-time 30 -A "$UA" "$URL")
if [ -z "$HTML" ]; then
  n=$(( $(cat "$FAILS" 2>/dev/null || echo 0) + 1 ))
  echo "$n" > "$FAILS"
  log "FETCH FAILED (streak $n)"
  [ "$n" -eq 3 ] && notify "⚠️ sciCORE watcher: 3 days in a row the page failed to load. Check the script.
$URL"
  exit 0
fi
echo 0 > "$FAILS"

CURRENT=$(printf '%s' "$HTML" | SCICORE_BASE="$URL" python3 -c '
import sys, re, html, os
from urllib.parse import urljoin
BASE = os.environ.get("SCICORE_BASE", "")
h = sys.stdin.read()
m = re.search(r"<h1>Join the team!</h1>(.*?)<footer", h, re.S | re.I)
body = m.group(1) if m else h
body = re.sub(r"<(script|style).*?</\1>", "", body, flags=re.S | re.I)
body = re.sub(r"<li[^>]*>", "\n- ", body, flags=re.I)

# Keep the posting URL: <a href="X">Role</a> -> "Role -> X", so the alert can be
# tapped straight through to the application page instead of the listing index.
QUOTES = chr(34) + chr(39)
A_TAG = "<a\\s[^>]*href=([" + QUOTES + "])(.*?)\\1[^>]*>(.*?)</a>"
def keep_link(m):
    href = html.unescape(m.group(2)).strip()
    text = re.sub(r"<[^>]+>", "", m.group(3)).strip()
    if not href or href.startswith(("#", "mailto:", "javascript:")):
        return text
    return "{} -> {}".format(text, urljoin(BASE, href))
body = re.sub(A_TAG, keep_link, body, flags=re.S | re.I)
body = re.sub(r"</(p|div|h[1-6]|ul|li|tr)>", "\n", body, flags=re.I)
body = re.sub(r"<[^>]+>", " ", body)
body = html.unescape(body)
lines = [re.sub(r"\s+", " ", l).strip() for l in body.split("\n")]
print("\n".join(l for l in lines if l and l not in {"-", " "}))
')

if [ -z "$CURRENT" ]; then
  log "PARSE FAILED (empty extraction)"
  exit 0
fi

if [ ! -f "$SNAP" ]; then
  printf '%s\n' "$CURRENT" > "$SNAP"
  log "BASELINE saved"
  if printf '%s' "$CURRENT" | grep -qi "$WANTED"; then
    notify "🚨 sciCORE listing mentions Software:

$CURRENT

$URL"
  fi
  exit 0
fi

if diff -q <(printf '%s\n' "$CURRENT") "$SNAP" >/dev/null; then
  log "no change"
  exit 0
fi

DIFF=$(diff "$SNAP" <(printf '%s\n' "$CURRENT") | sed -n 's/^> /+ /p;s/^< /- /p')
printf '%s\n' "$CURRENT" > "$SNAP"
log "CHANGED:
$DIFF"

# Only notify when a newly ADDED line contains the wanted word.
# Everything else (sysadmin roles, wording tweaks, removals) is tracked silently.
ADDED=$(printf '%s\n' "$DIFF" | grep '^+ ' || true)
if ! printf '%s' "$ADDED" | grep -qi "$WANTED"; then
  log "change ignored (no \"$WANTED\" in added lines)"
  exit 0
fi

notify "🚨 sciCORE posted a Software role

What changed:
$DIFF

Full listing now:
$CURRENT

$URL"