#!/bin/bash

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

if [ ! -f "$STATE_FILE" ] || ! jq -e . "$STATE_FILE" >/dev/null 2>&1; then
    echo "{}" > "$STATE_FILE"
fi

while true; do
    if [ -f "$CONFIG_FILE" ]; then
        source "$CONFIG_FILE"
    else
        echo "❌ Fehler: $CONFIG_FILE nicht gefunden!"
        sleep 60; continue
    fi

    cat <<EOF > /etc/msmtprc
defaults
auth on
tls on
tls_starttls off
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

    INTERVAL=${CHECK_INTERVAL:-3600}
    UPDATES_FOUND=""
    VALID_KEYS=()
    echo "--- Starte Check: $(date) ---"

    for entry in "${TARGETS[@]}"; do
        IFS="|" read -r TYPE REPO EXTRA <<< "$entry"
        
        CLEAN_REPO_NAME=$(echo "$REPO" | sed -E 's/\/\/[^@]+@/\/\//')
        KEY="${TYPE}_${CLEAN_REPO_NAME//[\/\.:]/_}_${EXTRA}"
        VALID_KEYS+=("$KEY")
        
        OLD_VAL=$(jq -r ".[\"$KEY\"] // empty" "$STATE_FILE")
        NEW_VAL=""

        echo "Prüfe $TYPE: $CLEAN_REPO_NAME:$EXTRA..."

        if [ "$TYPE" == "DOCKER" ]; then
            if [[ "$REPO" != *"."* ]] || [[ "$REPO" == *"docker.io"* ]]; then
                CLEAN_HUB=${REPO#docker.io/}
                [[ "$CLEAN_HUB" != *"/"* ]] && CLEAN_HUB="library/$CLEAN_HUB"
                NEW_VAL=$(curl -s "https://hub.docker.com/v2/repositories/${CLEAN_HUB}/tags/${EXTRA}" | jq -r '.last_updated // empty')
            else
                REG_HOST=$(echo $REPO | cut -d/ -f1)
                IMG_NAME=$(echo $REPO | cut -d/ -f2-)
                TOKEN=$(curl -s "https://${REG_HOST}/v2/token?service=${REG_HOST}&scope=repository:${IMG_NAME}:pull" | jq -r '.token // empty')
                [[ -n "$TOKEN" && "$TOKEN" != "null" ]] && AUTH_H="Authorization: Bearer $TOKEN" || AUTH_H="X-No-Auth: true"
                RESPONSE=$(curl -s -i -L -H "$AUTH_H" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" "https://${REG_HOST}/v2/${IMG_NAME}/manifests/${EXTRA}")
                NEW_VAL=$(echo "$RESPONSE" | grep -i "docker-content-digest" | awk '{print $2}' | tr -d '\r')
                [[ -z "$NEW_VAL" ]] && NEW_VAL=$(echo "$RESPONSE" | grep -i "etag" | awk '{print $2}' | tr -d '\r' | tr -d '"')
            fi
        elif [ "$TYPE" == "GITHUB" ] || [ "$TYPE" == "GIT" ]; then
            if [[ "$REPO" =~ ^http ]] || [[ "$REPO" == *"."* ]]; then
                URL="$REPO"
                [[ ! "$URL" =~ ^http ]] && URL="https://$URL"
                NEW_VAL=$(GIT_TERMINAL_PROMPT=0 timeout 15s git ls-remote "$URL" "refs/heads/$EXTRA" 2>/dev/null | awk '{print $1}')
                if [ $? -ne 0 ] || [ -z "$NEW_VAL" ]; then echo "  ⚠️  Git Fehler."; continue; fi
            else
                NEW_VAL=$(curl -s "https://api.github.com/repos/${REPO}/branches/${EXTRA}" | jq -r '.commit.sha // empty')
            fi
        fi

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

        if [ -z "$OLD_VAL" ] || [ "$OLD_VAL" != "$NEW_VAL" ]; then
            if [ -z "$OLD_VAL" ]; then 
                echo "  🆕 Neuaufnahme."
            else 
                # HIER DIE ÄNDERUNG: Typ voranstellen
                MSG="[$TYPE] Update für: $CLEAN_REPO_NAME ($EXTRA)"
                echo "  🔔 $MSG"
                # Wir fügen einen Zeilenumbruch für die Mail hinzu
                UPDATES_FOUND="${UPDATES_FOUND}${MSG}\n"
            fi
            # Speichern...
            NEW_JSON=$(jq ".[\"$KEY\"] = \"$NEW_VAL\"" "$STATE_FILE" 2>/dev/null)
            echo "$NEW_JSON" > "${STATE_FILE}.tmp" && mv "${STATE_FILE}.tmp" "$STATE_FILE"
        else
            echo "  ✅ Aktuell."
        fi
    done

    echo "Säubere veraltete Einträge..."
    VALID_KEYS_JSON=$(printf '%s\n' "${VALID_KEYS[@]}" | jq -R . | jq -s .)
    CLEAN_JSON=$(jq "with_entries(select(.key as \$k | $VALID_KEYS_JSON | index(\$k)))" "$STATE_FILE")
    echo "$CLEAN_JSON" > "$STATE_FILE"

    # Mail Versand
    if [ -n "$UPDATES_FOUND" ]; then
        echo "  📧 Sende Benachrichtigung an $EMAIL_TO..."
        
        (
          echo "To: $EMAIL_TO"
          echo "Subject: Watchdog Update Alert"
          echo "Content-Type: text/plain; charset=utf-8"
          echo "Content-Transfer-Encoding: 8bit"
          echo ""
          echo "Der Watchdog hat folgende Updates gefunden:"
          echo "------------------------------------------"
          echo -e "$UPDATES_FOUND"
          echo "------------------------------------------"
          echo "Check beendet am: $(date)"
        ) | timeout 30s msmtp "$EMAIL_TO"
        
        if [ $? -eq 0 ]; then
            echo "  ✅ E-Mail erfolgreich versendet."
        else
            echo "  ❌ E-Mail Versand fehlgeschlagen!"
        fi
    fi

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