#!/bin/bash
# requeue_email.sh
# Nimmt eine existierende Email aus S3 und stellt ein Event in die SQS Queue,
# um eine erneute Verarbeitung durch den Worker auszulösen.

set -e

# --- Parameter ---
DOMAIN="$1"
RECIPIENT="$2"
MESSAGE_ID="$3" # Das ist der S3 Key (die lange Zeichenkette aus dem Log)
AWS_REGION=${AWS_REGION:-"us-east-2"}

if [ -z "$DOMAIN" ] || [ -z "$RECIPIENT" ] || [ -z "$MESSAGE_ID" ]; then
    echo "Usage: $0 <domain> <recipient> <s3-message-id>"
    echo "Example: $0 buddelectric.net Tyler@buddelectric.net cn8j6j970atkh7n3fstdhgqr9imgrivegnm70jg1"
    exit 1
fi

# --- Variablen ableiten ---
BUCKET_NAME=$(echo "$DOMAIN" | tr '.' '-')"-emails"
QUEUE_NAME=$(echo "$DOMAIN" | tr '.' '-')"-queue"
TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")

echo "============================================================"
echo "  Requeue S3 Email"
echo "============================================================"
echo "  Domain:    $DOMAIN"
echo "  Recipient: $RECIPIENT"
echo "  Bucket:    $BUCKET_NAME"
echo "  Key (ID):  $MESSAGE_ID"
echo ""

# --- Schritt 1: Prüfen ob S3 Objekt existiert ---
echo "[1/2] Checking S3 object: s3://${BUCKET_NAME}/${MESSAGE_ID} ..."

if aws s3 ls "s3://${BUCKET_NAME}/${MESSAGE_ID}" --region "$AWS_REGION" > /dev/null 2>&1; then
    echo "  ✓ Object found."
else
    echo "  ❌ ERROR: Object s3://${BUCKET_NAME}/${MESSAGE_ID} does not exist!"
    exit 1
fi

# --- Schritt 2: Nachricht in SQS stellen ---
echo "[2/2] Placing message in SQS queue..."

QUEUE_URL=$(aws sqs get-queue-url \
    --queue-name "$QUEUE_NAME" \
    --region "$AWS_REGION" \
    --output text \
    --query 'QueueUrl')

if [ -z "$QUEUE_URL" ]; then
    echo "  ❌ ERROR: Queue $QUEUE_NAME not found!"
    exit 1
fi

# SES event payload (Simuliert die Lambda-Ausgabe)
# Wir nutzen "requeue@admin" als Source, da der Worker den echten Absender 
# ohnehin aus den Email-Headern im S3-File parst.
SES_DATA=$(jq -n \
    --arg msgId "$MESSAGE_ID" \
    --arg source "requeue-admin@${DOMAIN}" \
    --arg recipient "$RECIPIENT" \
    --arg ts "$TIMESTAMP" \
    --arg bucket "$BUCKET_NAME" \
    '{
        mail: {
            messageId: $msgId,
            source: $source,
            timestamp: $ts,
            destination: [$recipient]
        },
        receipt: {
            recipients: [$recipient],
            timestamp: $ts,
            action: {
                type: "S3",
                bucketName: $bucket,
                objectKey: $msgId
            }
        }
    }')

# Fake SNS wrapper (Gleiches Format wie Lambda Shim)
SQS_BODY=$(jq -n \
    --arg sesData "$SES_DATA" \
    --arg ts "$TIMESTAMP" \
    '{
        Type: "Notification",
        MessageId: "requeue-\(now | tostring)",
        TopicArn: "arn:aws:sns:ses-shim:global-topic",
        Subject: "Amazon SES Email Receipt Notification",
        Message: $sesData,
        Timestamp: $ts
    }')

# Senden
SQS_MSG_ID=$(aws sqs send-message \
    --queue-url "$QUEUE_URL" \
    --region "$AWS_REGION" \
    --message-body "$SQS_BODY" \
    --output text \
    --query 'MessageId')

echo "  ✓ Done (SQS MessageId: ${SQS_MSG_ID})"
echo ""
echo "============================================================"
echo "  Email successfully requeued!"
echo "  Worker should pick it up immediately."
echo "============================================================"