#!/bin/bash

CONFIG_DIR="/config"
CONFIG_FILE="$CONFIG_DIR/watchdog.conf"
STATE_FILE="$CONFIG_DIR/watch_state.json"

while true; do
    # 1. Config bei jedem Durchlauf neu laden (erlaubt Änderungen ohne Neustart)
    if [ -f "$CONFIG_FILE" ]; then
        source "$CONFIG_FILE"
    else
        echo "Fehler: $CONFIG_FILE nicht gefunden! Warte 60s..."
        sleep 60
        continue
    fi

    # Standard-Intervall falls nicht definiert (1 Stunde)
    INTERVAL=${CHECK_INTERVAL:-3600}

    # msmtp Konfig schreiben
    cat <<EOF > /etc/msmtprc
defaults
auth           on
tls            on
tls_trust_file /etc/ssl/certs/ca-certificates.crt
account        default
host           $SMTP_HOST
port           $SMTP_PORT
from           $EMAIL_FROM
user           $SMTP_USER
password       $SMTP_PASS
EOF
    chmod 600 /etc/msmtprc

    if [ ! -f "$STATE_FILE" ] || [ ! -s "$STATE_FILE" ]; then echo "{}" > "$STATE_FILE"; fi

    UPDATES_FOUND=""
    echo "--- Starte Check: $(date) ---"

    for entry in "${TARGETS[@]}"; do
        IFS="|" read -r TYPE REPO EXTRA <<< "$entry"
        KEY="${TYPE}_${REPO//[\/\.]/_}_${EXTRA}"
        OLD_VAL=$(jq -r ".[\"$KEY\"] // empty" "$STATE_FILE")
        NEW_VAL=""

        if [ "$TYPE" == "DOCKER" ]; then
            NEW_VAL=$(curl -s "https://hub.docker.com/v2/repositories/${REPO}/tags/${EXTRA}" | jq -r '.last_updated // empty')
        elif [ "$TYPE" == "GITHUB" ]; then
            NEW_VAL=$(curl -s "https://api.github.com/repos/${REPO}/branches/${EXTRA}" | jq -r '.commit.sha // empty')
        fi

        if [ -z "$NEW_VAL" ] || [ "$NEW_VAL" == "null" ]; then continue; fi

        if [ -n "$OLD_VAL" ] && [ "$OLD_VAL" != "$NEW_VAL" ]; then
            MSG="Update für $REPO ($EXTRA)! Alt: $OLD_VAL | Neu: $NEW_VAL"
            echo "🔔 $MSG"
            UPDATES_FOUND="${UPDATES_FOUND}${MSG}\n"
        fi

        TEMP_JSON=$(jq ".[\"$KEY\"] = \"$NEW_VAL\"" "$STATE_FILE")
        echo "$TEMP_JSON" > "$STATE_FILE"
    done

    # Mail senden
    if [ -n "$UPDATES_FOUND" ]; then
        echo -e "Subject: Watchdog Alert\nFrom: $EMAIL_FROM\nTo: $EMAIL_TO\n\n$UPDATES_FOUND" | msmtp "$EMAIL_TO"
    fi

    echo "Check beendet. Nächster Scan in $INTERVAL Sekunden."
    sleep "$INTERVAL"
done