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

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck disable=SC1091
source "$SCRIPT_DIR/kopia-common.sh"

require_cmd kopia
require_cmd docker
require_real_env KOPIA_PASSWORD
ensure_runtime_dirs

"$SCRIPT_DIR/pre-backup-dumps.sh"

if ! kopia_cmd repository status >/dev/null 2>&1; then
  echo "Kopia repository is not connected. Run $SCRIPT_DIR/init-r2-repository.sh first." >&2
  exit 1
fi

mapfile -t SNAPSHOT_PATHS < <(
  while IFS= read -r path; do
    [[ -z "$path" || "$path" =~ ^[[:space:]]*# ]] && continue
    if [[ -e "$path" ]]; then
      printf '%s\n' "$path"
    else
      log "Skip missing path: $path" >&2
    fi
  done < "$BACKUP_PATHS_FILE"
)

if [[ "${#SNAPSHOT_PATHS[@]}" -eq 0 ]]; then
  echo "No backup paths found from $BACKUP_PATHS_FILE" >&2
  exit 1
fi

mapfile -t IGNORE_PATTERNS < <(
  while IFS= read -r pattern; do
    [[ -z "$pattern" || "$pattern" =~ ^[[:space:]]*# ]] && continue
    printf '%s\n' "$pattern"
  done < "$KOPIA_EXCLUDES_FILE"
)

POLICY_ARGS=(
  --global \
  --keep-latest=7 \
  --keep-daily=7 \
  --keep-weekly=4 \
  --keep-monthly=6 \
  --compression=zstd \
  --clear-ignore
)

for pattern in "${IGNORE_PATTERNS[@]}"; do
  POLICY_ARGS+=(--add-ignore="$pattern")
done

log "Applying retention, compression and ignore policy"
kopia_cmd policy set "${POLICY_ARGS[@]}"

log "Starting Kopia snapshot with ${#SNAPSHOT_PATHS[@]} paths"
kopia_cmd snapshot create \
  --description="docker-host restore backup" \
  --tags="source:docker-host,type:restore" \
  "${SNAPSHOT_PATHS[@]}"

log "Validating R2 provider"
kopia_cmd repository validate-provider

log "Backup completed"