#!/bin/bash
# create-queue.sh (v2 — mit SNS Fan-Out + Standby Queue)
# Usage: DOMAIN=andreasknuth.de ./create-queue.sh
#
# Erstellt pro Domain:
#   - Primary Queue + DLQ          (wie bisher, für Contabo)
#   - Standby Queue + DLQ          (NEU, für Office-VM)
#   - SNS Topic                    (NEU, Fan-Out)
#   - 2 SNS Subscriptions          (NEU, Topic → Primary + Standby)

set -e

AWS_REGION="us-east-2"

if [ -z "$DOMAIN" ]; then
    echo "Error: DOMAIN environment variable not set"
    echo "Usage: DOMAIN=andreasknuth.de $0"
    exit 1
fi

DOMAIN_SLUG="${DOMAIN//./-}"
QUEUE_NAME="${DOMAIN_SLUG}-queue"
DLQ_NAME="${QUEUE_NAME}-dlq"
STANDBY_QUEUE_NAME="${DOMAIN_SLUG}-standby-queue"
STANDBY_DLQ_NAME="${STANDBY_QUEUE_NAME}-dlq"
TOPIC_NAME="${DOMAIN_SLUG}-topic"

ACCOUNT_ID=$(aws sts get-caller-identity --query 'Account' --output text)

echo "========================================"
echo "Creating SQS + SNS for Email Delivery"
echo "========================================"
echo ""
echo "📧 Domain:         $DOMAIN"
echo "   Region:         $AWS_REGION"
echo "   Account:        $ACCOUNT_ID"
echo ""

# ============================================================
# 1. Primary DLQ + Queue (wie bisher)
# ============================================================
echo "━━━ Primary Queue (Contabo) ━━━"

echo "Creating DLQ: $DLQ_NAME"
DLQ_URL=$(aws sqs create-queue \
    --queue-name "${DLQ_NAME}" \
    --region "${AWS_REGION}" \
    --attributes '{"MessageRetentionPeriod": "1209600"}' \
    --query 'QueueUrl' --output text 2>/dev/null \
    || aws sqs get-queue-url --queue-name "${DLQ_NAME}" --region "${AWS_REGION}" --query 'QueueUrl' --output text)
DLQ_ARN=$(aws sqs get-queue-attributes --queue-url "${DLQ_URL}" --region "${AWS_REGION}" \
    --attribute-names QueueArn --query 'Attributes.QueueArn' --output text)
echo "   ✓ DLQ: ${DLQ_ARN}"

echo "Creating Queue: $QUEUE_NAME"
QUEUE_URL=$(aws sqs create-queue \
    --queue-name "${QUEUE_NAME}" \
    --region "${AWS_REGION}" \
    --attributes "{
        \"VisibilityTimeout\": \"300\",
        \"MessageRetentionPeriod\": \"86400\",
        \"ReceiveMessageWaitTimeSeconds\": \"20\",
        \"RedrivePolicy\": \"{\\\"deadLetterTargetArn\\\":\\\"${DLQ_ARN}\\\",\\\"maxReceiveCount\\\":\\\"3\\\"}\"
    }" \
    --query 'QueueUrl' --output text 2>/dev/null \
    || aws sqs get-queue-url --queue-name "${QUEUE_NAME}" --region "${AWS_REGION}" --query 'QueueUrl' --output text)
QUEUE_ARN=$(aws sqs get-queue-attributes --queue-url "${QUEUE_URL}" --region "${AWS_REGION}" \
    --attribute-names QueueArn --query 'Attributes.QueueArn' --output text)
echo "   ✓ Queue: ${QUEUE_ARN}"
echo ""

# ============================================================
# 2. Standby DLQ + Queue (NEU)
# ============================================================
echo "━━━ Standby Queue (Office-VM) ━━━"

echo "Creating Standby DLQ: $STANDBY_DLQ_NAME"
STANDBY_DLQ_URL=$(aws sqs create-queue \
    --queue-name "${STANDBY_DLQ_NAME}" \
    --region "${AWS_REGION}" \
    --attributes '{"MessageRetentionPeriod": "1209600"}' \
    --query 'QueueUrl' --output text 2>/dev/null \
    || aws sqs get-queue-url --queue-name "${STANDBY_DLQ_NAME}" --region "${AWS_REGION}" --query 'QueueUrl' --output text)
STANDBY_DLQ_ARN=$(aws sqs get-queue-attributes --queue-url "${STANDBY_DLQ_URL}" --region "${AWS_REGION}" \
    --attribute-names QueueArn --query 'Attributes.QueueArn' --output text)
echo "   ✓ Standby DLQ: ${STANDBY_DLQ_ARN}"

echo "Creating Standby Queue: $STANDBY_QUEUE_NAME"
STANDBY_QUEUE_URL=$(aws sqs create-queue \
    --queue-name "${STANDBY_QUEUE_NAME}" \
    --region "${AWS_REGION}" \
    --attributes "{
        \"VisibilityTimeout\": \"300\",
        \"MessageRetentionPeriod\": \"86400\",
        \"ReceiveMessageWaitTimeSeconds\": \"20\",
        \"RedrivePolicy\": \"{\\\"deadLetterTargetArn\\\":\\\"${STANDBY_DLQ_ARN}\\\",\\\"maxReceiveCount\\\":\\\"3\\\"}\"
    }" \
    --query 'QueueUrl' --output text 2>/dev/null \
    || aws sqs get-queue-url --queue-name "${STANDBY_QUEUE_NAME}" --region "${AWS_REGION}" --query 'QueueUrl' --output text)
STANDBY_QUEUE_ARN=$(aws sqs get-queue-attributes --queue-url "${STANDBY_QUEUE_URL}" --region "${AWS_REGION}" \
    --attribute-names QueueArn --query 'Attributes.QueueArn' --output text)
echo "   ✓ Standby Queue: ${STANDBY_QUEUE_ARN}"
echo ""

# ============================================================
# 3. SNS Topic (NEU)
# ============================================================
echo "━━━ SNS Topic (Fan-Out) ━━━"

echo "Creating Topic: $TOPIC_NAME"
TOPIC_ARN=$(aws sns create-topic \
    --name "${TOPIC_NAME}" \
    --region "${AWS_REGION}" \
    --query 'TopicArn' --output text)
echo "   ✓ Topic: ${TOPIC_ARN}"
echo ""

# ============================================================
# 4. SNS → SQS Subscriptions (NEU)
# ============================================================
echo "━━━ Subscriptions ━━━"

# SNS braucht Berechtigung, in die SQS Queues zu schreiben
# Policy für Primary Queue
POLICY_PRIMARY="{
  \"Version\": \"2012-10-17\",
  \"Statement\": [{
    \"Effect\": \"Allow\",
    \"Principal\": {\"Service\": \"sns.amazonaws.com\"},
    \"Action\": \"sqs:SendMessage\",
    \"Resource\": \"${QUEUE_ARN}\",
    \"Condition\": {\"ArnEquals\": {\"aws:SourceArn\": \"${TOPIC_ARN}\"}}
  }]
}"

aws sqs set-queue-attributes \
    --queue-url "${QUEUE_URL}" \
    --region "${AWS_REGION}" \
    --attributes "{\"Policy\": $(echo "$POLICY_PRIMARY" | jq -c '.' | jq -Rs '.')}" \
    > /dev/null
echo "   ✓ Primary Queue Policy gesetzt"

# Policy für Standby Queue
POLICY_STANDBY="{
  \"Version\": \"2012-10-17\",
  \"Statement\": [{
    \"Effect\": \"Allow\",
    \"Principal\": {\"Service\": \"sns.amazonaws.com\"},
    \"Action\": \"sqs:SendMessage\",
    \"Resource\": \"${STANDBY_QUEUE_ARN}\",
    \"Condition\": {\"ArnEquals\": {\"aws:SourceArn\": \"${TOPIC_ARN}\"}}
  }]
}"

aws sqs set-queue-attributes \
    --queue-url "${STANDBY_QUEUE_URL}" \
    --region "${AWS_REGION}" \
    --attributes "{\"Policy\": $(echo "$POLICY_STANDBY" | jq -c '.' | jq -Rs '.')}" \
    > /dev/null
echo "   ✓ Standby Queue Policy gesetzt"

# Subscription: Topic → Primary Queue
SUB_PRIMARY=$(aws sns subscribe \
    --topic-arn "${TOPIC_ARN}" \
    --protocol sqs \
    --notification-endpoint "${QUEUE_ARN}" \
    --region "${AWS_REGION}" \
    --attributes '{"RawMessageDelivery": "true"}' \
    --query 'SubscriptionArn' --output text)
echo "   ✓ Subscription Primary: ${SUB_PRIMARY}"

# Subscription: Topic → Standby Queue
SUB_STANDBY=$(aws sns subscribe \
    --topic-arn "${TOPIC_ARN}" \
    --protocol sqs \
    --notification-endpoint "${STANDBY_QUEUE_ARN}" \
    --region "${AWS_REGION}" \
    --attributes '{"RawMessageDelivery": "true"}' \
    --query 'SubscriptionArn' --output text)
echo "   ✓ Subscription Standby: ${SUB_STANDBY}"
echo ""

# ============================================================
# Zusammenfassung
# ============================================================
echo "========================================"
echo "✅ Setup complete for $DOMAIN"
echo "========================================"
echo ""
echo "Primary (Contabo):"
echo "  Queue:    $QUEUE_URL"
echo "  DLQ:      $DLQ_URL"
echo ""
echo "Standby (Office-VM):"
echo "  Queue:    $STANDBY_QUEUE_URL"
echo "  DLQ:      $STANDBY_DLQ_URL"
echo ""
echo "SNS Fan-Out:"
echo "  Topic:    $TOPIC_ARN"
echo "  → Primary:  $SUB_PRIMARY"
echo "  → Standby:  $SUB_STANDBY"
echo ""
echo "⚠️  Nächste Schritte:"
echo "  1. Lambda-Funktion updaten: sns.publish() statt sqs.send_message()"
echo "  2. Lambda IAM Role: sns:Publish Berechtigung hinzufügen"
echo "  3. Worker auf Office-VM: QUEUE_SUFFIX=-standby-queue konfigurieren"
echo "  4. Worker auf Office-VM: STANDBY_MODE=true setzen"