#!/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}"
  : "${CONFIRM_PHRASE:=I UNDERSTAND THIS WILL BROADCAST A BITCOIN TX}"
  [[ "$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() {
  : "${ROOT_HEX:=}"
  : "${ROOT_FILE:=}"
  if [[ -n "$ROOT_HEX" ]]; then
    echo "${ROOT_HEX#0x}"
    return 0
  fi
  [[ -n "$ROOT_FILE" ]] || die "Set ROOT_HEX or ROOT_FILE."
  [[ -f "$ROOT_FILE" ]] || die "ROOT_FILE not found: $ROOT_FILE"
  rh="$(grep '^root_hex=' "$ROOT_FILE" | head -n1 | cut -d= -f2)"
  [[ -n "$rh" ]] || die "Could not parse root_hex from ROOT_FILE."
  echo "${rh#0x}"
}

net_flag() {
  : "${BTC_NETWORK:=testnet}"
  case "$BTC_NETWORK" in
    mainnet) echo "" ;;
    testnet) echo "-testnet" ;;
    signet) echo "-signet" ;;
    *) die "BTC_NETWORK must be mainnet|testnet|signet" ;;
  esac
}

ascii_to_hex() {
  # portable: use xxd
  echo -n "$1" | xxd -p -c 256 | tr -d '\n'
}