#!/bin/bash
# Kanboard restore — companion to backup.sh (kb#192).
#
# Restores a snapshot produced by backup.sh (db.sqlite + optional plugins.tar.gz)
# into a running Kanboard container. Defaults to the live "kanboard" container/
# volumes, but every target is overridable via env vars so the exact same script
# can be pointed at a disposable/throwaway container for a dry-run restore test
# (see kb#192 runbook for the recommended throwaway-container recipe).
#
# Usage:
#   ./restore.sh /mnt/backups/kanboard/<snapshot-dir>
#
# Env overrides (defaults = live service):
#   CONTAINER=kanboard                 # target container name
#   DATA_PATH=/var/www/app/data        # data dir inside the container
#   PLUGINS_PATH=/var/www/app/plugins  # plugins dir inside the container
#
# WARNING: this overwrites the target container's live database. Never run
# against the "kanboard" container name unless you intend a real disaster
# recovery — for testing, point CONTAINER at a throwaway container instead.

set -euo pipefail

CONTAINER="${CONTAINER:-kanboard}"
DATA_PATH="${DATA_PATH:-/var/www/app/data}"
PLUGINS_PATH="${PLUGINS_PATH:-/var/www/app/plugins}"

if [ $# -lt 1 ]; then
  echo "Usage: $0 <path-to-backup-snapshot-dir>" >&2
  echo "  e.g. $0 /mnt/backups/kanboard/20260728-0300" >&2
  exit 1
fi

SRC="$(realpath "$1")"
DB_FILE="$SRC/db.sqlite"
PLUGINS_FILE="$SRC/plugins.tar.gz"

if [ ! -f "$DB_FILE" ]; then
  echo "Error: $DB_FILE not found" >&2
  exit 1
fi

if ! docker inspect "$CONTAINER" > /dev/null 2>&1; then
  echo "Error: container '$CONTAINER' does not exist" >&2
  exit 1
fi

echo "Restoring into container '$CONTAINER' from $SRC"

# Stop the app so the sqlite file isn't being written to concurrently.
docker stop "$CONTAINER" > /dev/null

# Replace the database file.
docker cp "$DB_FILE" "$CONTAINER:$DATA_PATH/db.sqlite"

# Restore plugins, if present in the snapshot.
if [ -f "$PLUGINS_FILE" ]; then
  docker cp "$PLUGINS_FILE" "$CONTAINER:/tmp/plugins.tar.gz"
  docker start "$CONTAINER" > /dev/null
  # Extract inside the container so ownership matches what the app expects.
  docker exec "$CONTAINER" sh -c "rm -rf '$PLUGINS_PATH'/* && tar -xzf /tmp/plugins.tar.gz -C '$PLUGINS_PATH' && rm -f /tmp/plugins.tar.gz"
else
  echo "Note: no plugins.tar.gz in snapshot, skipping plugin restore"
  docker start "$CONTAINER" > /dev/null
fi

echo "Waiting for Kanboard to come up..."
for i in $(seq 1 30); do
  if docker exec "$CONTAINER" php -r 'exit(file_exists("'"$DATA_PATH"'/db.sqlite") ? 0 : 1);' > /dev/null 2>&1; then
    break
  fi
  sleep 1
done

echo "Verifying restored database..."
docker exec "$CONTAINER" php -r '
$db = new PDO("sqlite:'"$DATA_PATH"'/db.sqlite");
$count = $db->query("SELECT COUNT(*) FROM tasks")->fetchColumn();
echo "tasks table row count: $count\n";
'

echo "Restore complete: $CONTAINER"