#!/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:=}"
: "${DR_TARGET_BASE:=$HOME/recovery-drills}"
: "${AGE_IDENTITY_FILE:=}"

main() {
  log_info "Starting 00_preflight.sh"
  [[ -n "$BACKUP_SKILL_DIR" ]] || die "BACKUP_SKILL_DIR is required."
  [[ -d "$BACKUP_SKILL_DIR" ]] || die "BACKUP_SKILL_DIR not found: $BACKUP_SKILL_DIR"

  [[ -n "$AGE_IDENTITY_FILE" ]] || die "AGE_IDENTITY_FILE is required."
  [[ -f "$AGE_IDENTITY_FILE" ]] || die "AGE_IDENTITY_FILE not found: $AGE_IDENTITY_FILE"

  need tar
  need gzip
  need age
  need find
  need stat

  if command -v b3sum >/dev/null 2>&1 || command -v blake3 >/dev/null 2>&1; then
    :
  else
    die "Need BLAKE3 tool: b3sum (preferred) or blake3."
  fi

  mkdir -p "$SKILL_ROOT/outputs"
  mkdir -p "$DR_TARGET_BASE"

  local resolved
  resolved="$(resolve_run_dir "$BACKUP_SKILL_DIR" "$RUN_DIR")"
  [[ -d "$resolved" ]] || die "Resolved RUN_DIR not found: $resolved"
  log_info "Using RUN_DIR: $resolved"
  log_info "Preflight OK."
}

main "$@"