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

if [[ $# -ne 1 ]]; then
  echo "Usage: $0 <tx_hash>" >&2
  exit 1
fi

if [[ -z "${ARBISCAN_API_KEY:-}" ]]; then
  echo "Error: ARBISCAN_API_KEY environment variable is required." >&2
  exit 1
fi

TX_HASH="$1"

# Prefer the newer V2 endpoint; fall back to V1 if it fails (for backwards compatibility)
response=$(curl -s "https://api.arbiscan.io/v2/api?module=proxy&action=eth_getTransactionByHash&txhash=${TX_HASH}&apikey=${ARBISCAN_API_KEY}")
status=$(echo "$response" | jq -r '.status' 2>/dev/null || echo "")

if [[ "$status" == "1" || "$status" == "0" && "$response" == *"result"* ]]; then
  echo "$response"
  exit 0
fi

# Fallback to legacy V1 endpoint
curl -s "https://api.arbiscan.io/api?module=proxy&action=eth_getTransactionByHash&txhash=${TX_HASH}&apikey=${ARBISCAN_API_KEY}"