#!/usr/bin/env bash
set -euo pipefail

# Восстановление Gitea из архива backup-gitea.sh.
#
# Пример:
#   sudo ./scripts/restore-gitea.sh /opt/backups/gitea/gitea-backup-20260421-031000.tar.gz
#
# По умолчанию:
# - target dir: /opt/gitea/data
# - create snapshot before restore: yes

if [[ $# -lt 1 ]]; then
  echo "Usage: $0 <backup-archive.tar.gz>"
  exit 1
fi

ARCHIVE_PATH="$1"
TARGET_DIR="${TARGET_DIR:-/opt/gitea/data}"
TAKE_SNAPSHOT_BEFORE_RESTORE="${TAKE_SNAPSHOT_BEFORE_RESTORE:-true}"
SNAPSHOT_DIR="${SNAPSHOT_DIR:-/opt/backups/gitea}"
DATE_TAG="$(date +%Y%m%d-%H%M%S)"

if [[ ! -f "$ARCHIVE_PATH" ]]; then
  echo "[ERR] Archive not found: $ARCHIVE_PATH"
  exit 1
fi

if [[ "${EUID:-$(id -u)}" -ne 0 ]]; then
  echo "[ERR] Run as root (sudo)."
  exit 1
fi

echo "[INFO] Restore archive: $ARCHIVE_PATH"
echo "[INFO] Target dir: $TARGET_DIR"

if [[ "$TAKE_SNAPSHOT_BEFORE_RESTORE" == "true" && -d "$TARGET_DIR" ]]; then
  mkdir -p "$SNAPSHOT_DIR"
  SNAPSHOT_PATH="${SNAPSHOT_DIR}/gitea-pre-restore-${DATE_TAG}.tar.gz"
  echo "[INFO] Creating pre-restore snapshot: $SNAPSHOT_PATH"
  tar -C "$(dirname "$TARGET_DIR")" -czf "$SNAPSHOT_PATH" "$(basename "$TARGET_DIR")"
fi

if command -v docker >/dev/null 2>&1; then
  if [[ -f /opt/gitea/docker-compose.yml ]]; then
    echo "[INFO] Stopping Gitea container..."
    (cd /opt/gitea && docker compose stop gitea)
  fi
fi

TMP_DIR="$(mktemp -d)"
trap 'rm -rf "$TMP_DIR"' EXIT

echo "[INFO] Extracting archive..."
tar -C "$TMP_DIR" -xzf "$ARCHIVE_PATH"

if [[ ! -d "$TMP_DIR/data" ]]; then
  echo "[ERR] Archive structure is invalid: expected 'data/' root folder"
  exit 1
fi

echo "[INFO] Restoring files to $TARGET_DIR"
rm -rf "$TARGET_DIR"
mkdir -p "$(dirname "$TARGET_DIR")"
mv "$TMP_DIR/data" "$TARGET_DIR"

# Чаще всего Gitea в контейнере работает как uid/gid 1000.
chown -R 1000:1000 "$TARGET_DIR" || true

if command -v docker >/dev/null 2>&1; then
  if [[ -f /opt/gitea/docker-compose.yml ]]; then
    echo "[INFO] Starting Gitea container..."
    (cd /opt/gitea && docker compose up -d gitea)
  fi
fi

echo "[OK] Restore completed"