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

PORT="${1:-/dev/cu.usbmodem1101}"
OFFSET="${2:-0x10000}"
BIN_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)/firmware-custom"
BIN_FILE="${BIN_DIR}/firmware-heltec-v4-2.7.26.54e0d8d.bin"

if [[ ! -f "$BIN_FILE" ]]; then
  echo "Error: Firmware binary not found at $BIN_FILE" >&2
  exit 1
fi

ESPTOOL_BIN="$(which esptool || which esptool.py || echo "${HOME}/.local/bin/esptool.py")"

echo "Flashing $BIN_FILE to $PORT at offset $OFFSET..."
"$ESPTOOL_BIN" --port "$PORT" --baud 921600 write_flash "$OFFSET" "$BIN_FILE"
echo "Flash completed successfully."