#!/bin/bash
# Pre-Backup Hook für Docker Container
# Dumped Datenbanken und exportiert Named Volumes

LOG_FILE="${1:-/var/log/mbo-backup/docker-pre-backup.log}"
DOCKER_BACKUP_DIR="/var/backups/docker"
DUMP_DIR="$DOCKER_BACKUP_DIR/$(date +%Y%m%d-%H%M%S)"

mkdir -p "$DUMP_DIR"

log() {
  echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" | tee -a "$LOG_FILE"
}

# ======================
# MySQL/MariaDB Dumps
# ======================
dump_mysql_containers() {
  log "Dumping MySQL/MariaDB containers..."

  docker ps --filter "label=backup.mysql=true" --format "{{.Names}}" | while read container; do
    log "  Dumping $container..."
    docker exec "$container" mysqldump \
      --all-databases \
      --single-transaction \
      --quick \
      --lock-tables=false \
      > "$DUMP_DIR/${container}-mysql-dump.sql" \
      2>> "$LOG_FILE" || log "Failed to dump $container"
  done
}

# ======================
# PostgreSQL Dumps
# ======================
dump_postgres_containers() {
  log "Dumping PostgreSQL containers..."

  docker ps --filter "label=backup.postgres=true" --format "{{.Names}}" | while read container; do
    log "  Dumping $container..."
    docker exec "$container" pg_dumpall \
      > "$DUMP_DIR/${container}-postgres-dump.sql" \
      2>> "$LOG_FILE" || log "Failed to dump $container"
  done
}

# ======================
# Named Volumes Export
# ======================
export_named_volumes() {
  log "Exporting named volumes..."

  docker volume ls --filter "label=backup=true" --format "{{.Name}}" | while read volume; do
    log "  Exporting volume: $volume..."

    VOLUME_BACKUP="$DUMP_DIR/volume-${volume}.tar.gz"

    # Erstelle Container zum Backup der Volume
    docker run --rm \
      -v "$volume:/data" \
      -v "$DUMP_DIR:/backup" \
      alpine tar czf "/backup/$(basename "$VOLUME_BACKUP")" -C /data . \
      2>> "$LOG_FILE" || log "Failed to export volume $volume"
  done
}

# ======================
# Docker Compose Backups
# ======================
backup_compose_files() {
  log "Backing up docker-compose files..."

  find / -name "docker-compose.yml" -o -name "docker-compose.yaml" 2>/dev/null | while read compose_file; do
    dir=$(dirname "$compose_file")
    safe_name=$(echo "$dir" | sed 's/\//_/g')
    log "  Backing up: $compose_file"
    cp "$compose_file" "$DUMP_DIR/compose-${safe_name}.yml" 2>> "$LOG_FILE"
  done
}

# ======================
# Cleanup old dumps
# ======================
cleanup_old_dumps() {
  log "Cleaning up backups older than 7 days..."
  find "$DOCKER_BACKUP_DIR" -type d -mtime +7 -exec rm -rf {} \; 2>/dev/null || true
}

# ======================
# Main
# ======================
log "=== Docker Pre-Backup Started ==="

dump_mysql_containers
dump_postgres_containers
export_named_volumes
backup_compose_files
cleanup_old_dumps

log "=== Docker Pre-Backup Completed ==="
log "Backup directory: $DUMP_DIR"