#!/bin/bash
# /opt/backup/docker_postgres_backup.sh

BACKUP_DIR="/opt/backup"
RETENTION_DAYS=3 # Backups 3 Tage behalten
DATE=$(date +'%Y-%m-%d')

DATABASES=(
  "keycloak-db:keycloak:keycloak"     # Keycloak DB
  "odoo-db:odoo:busybox-demo"         # Odoo DB
  "wikijs-db:wikijs:wikijs"           # WikiJS DB
)

RESULTS=()

mkdir -p "$BACKUP_DIR"

for DB_ENTRY in "${DATABASES[@]}"; do
    IFS=":" read -r CONTAINER DB_USER DB_NAME <<< "$DB_ENTRY"
    FILENAME="${BACKUP_DIR}/${DATE}_db_${DB_NAME}.sql.gz"

    echo "Sichere Datenbank '${DB_NAME}' aus Container '${CONTAINER}'..."

    if docker exec "$CONTAINER" pg_dump -U "$DB_USER" "$DB_NAME" | gzip > "$FILENAME"; then
        RESULTS+=("\"$DB_NAME\":\"ok\"")
    else
        RESULTS+=("\"$DB_NAME\":\"error\"")
    fi
done

# Alte Backups löschen
find "$BACKUP_DIR" -name "*.sql.gz" -type f -mtime +$RETENTION_DAYS -exec rm {} \;

# JSON-Ausgabe formatieren
JSON_OUTPUT="{"
JSON_OUTPUT+=$(IFS=, ; echo "${RESULTS[*]}")
JSON_OUTPUT+="}"

echo "$JSON_OUTPUT"