#!/usr/bin/env bash
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
source "$SCRIPT_DIR/_common.sh"

: "${BACKUP_SKILL_DIR:=}"
: "${RUN_DIR:=}"

main() {
  [[ -n "$BACKUP_SKILL_DIR" ]] || die "BACKUP_SKILL_DIR is required."
  local run_dir
  run_dir="$(resolve_run_dir "$BACKUP_SKILL_DIR" "$RUN_DIR")"
  [[ -d "$run_dir" ]] || die "RUN_DIR not found: $run_dir"

  local enc="$run_dir/archive.tar.gz.age"
  local manifest="$run_dir/manifest.json"
  local root="$run_dir/ROOT.txt"
  local proof="$run_dir/PROOF.json"

  [[ -f "$enc" ]] || die "Missing: $enc"
  [[ -f "$manifest" ]] || die "Missing: $manifest"
  [[ -f "$root" ]] || die "Missing: $root"
  [[ -f "$proof" ]] || die "Missing: $proof"

  local mb3 eb3 recomputed existing
  mb3="$(b3_file "$manifest")"
  eb3="$(b3_file "$enc")"
  recomputed="$(printf "%s\n%s\n" "$mb3" "$eb3" | (command -v b3sum >/dev/null 2>&1 && b3sum || blake3) | awk '{print $1}')"
  existing="$(tr -d ' \n\r\t' < "$root")"

  [[ "$recomputed" == "$existing" ]] || die "ROOT mismatch. existing=$existing recomputed=$recomputed"

  log_info "Validation OK: artifacts present and ROOT matches recomputation."
  log_info "Next: ./scripts/20_restore_plan.sh"
}

main "$@"