#!/usr/bin/env bash
set -euo pipefail
log_info(){ echo "[INFO]  $(date -Iseconds) $*"; }
log_warn(){ echo "[WARN]  $(date -Iseconds) $*" >&2; }
log_error(){ echo "[ERROR] $(date -Iseconds) $*" >&2; }
die(){ log_error "$*"; exit 1; }
need(){ command -v "$1" >/dev/null 2>&1 || die "Missing required tool: $1"; }

confirm_gate() {
  : "${DRY_RUN:=1}"
  : "${REQUIRE_CONFIRM:=1}"
  : "${CONFIRM_PHRASE:=I UNDERSTAND THIS WILL SEND AN ETH TRANSACTION}"
  [[ "$DRY_RUN" == "0" ]] || die "DRY_RUN=$DRY_RUN (set DRY_RUN=0)."
  if [[ "$REQUIRE_CONFIRM" == "1" ]]; then
    echo "Type to confirm:"
    echo "  $CONFIRM_PHRASE"
    read -r input
    [[ "$input" == "$CONFIRM_PHRASE" ]] || die "Confirmation phrase mismatch."
  fi
}

json_escape() {
  local s="$1"
  s="${s//\\/\\\\}"; s="${s//\"/\\\"}"; s="${s//$'\n'/\\n}"
  printf "%s" "$s"
}

read_root_hex() {
  # precedence: ROOT_HEX, else parse ROOT_FILE
  : "${ROOT_HEX:=}"
  : "${ROOT_FILE:=}"
  if [[ -n "$ROOT_HEX" ]]; then
    echo "$ROOT_HEX"
    return 0
  fi
  [[ -n "$ROOT_FILE" ]] || die "Set ROOT_HEX or ROOT_FILE."
  [[ -f "$ROOT_FILE" ]] || die "ROOT_FILE not found: $ROOT_FILE"
  local rh
  rh="$(grep '^root_hex=' "$ROOT_FILE" | head -n1 | cut -d= -f2)"
  [[ -n "$rh" ]] || die "Could not parse root_hex from ROOT_FILE."
  echo "$rh"
}

pad_to_32_bytes_hex() {
  # expects hex without 0x
  local h="$1"
  h="${h#0x}"
  # limit to 64, pad right with zeros if shorter (simple deterministic padding)
  if [[ ${#h} -gt 64 ]]; then
    echo "${h:0:64}"
  else
    printf "%-64s" "$h" | tr ' ' '0'
  fi
}