#!/usr/bin/env bash
# =============================================================================
# Smart Contract Processing Logic
#
# This file contains the transaction processing logic for your smart contract.
# Modify this script to implement your business logic.
#
# Input:
#   $1          - Transaction JSON string
#   Environment - Server env vars and secrets are exported as environment variables
#
# Output (stdout):
#   A JSON object with the following fields:
#   {
#     "data": { ... },           // Your result data (any JSON object)
#     "output_to_chain": true,   // Whether to persist the result on chain
#     "error": ""                // Error message (empty string if no error)
#   }
#
# Logs (stderr):
#   Anything written to stderr is captured and sent back as logs.
#
# Exit code:
#   0 = success (stdout is parsed as JSON result)
#   non-zero = error (stderr is used as the error message)
# =============================================================================

set -euo pipefail

# Transaction JSON is passed as the first argument
TX_JSON="$1"

# =============================================================================
# TODO: Implement your smart contract logic here
# =============================================================================
#
# Parse transaction fields using jq:
#   TXN_ID=$(echo "$TX_JSON" | jq -r '.header.txn_id')
#   TXN_TYPE=$(echo "$TX_JSON" | jq -r '.header.txn_type')
#   PAYLOAD=$(echo "$TX_JSON" | jq '.payload')
#
# Access environment variables (set by the server):
#   echo "Smart Contract Name: $SMART_CONTRACT_NAME" >&2
#   echo "Dragonchain ID: $DRAGONCHAIN_ID" >&2
#
# Access secrets (set by the server):
#   MY_SECRET="${SC_SECRET_MY_SECRET:-}"
#
# Process based on payload action:
#   ACTION=$(echo "$TX_JSON" | jq -r '.payload.action // empty')
#   case "$ACTION" in
#     create)
#       # Handle create operation
#       ;;
#     update)
#       # Handle update operation
#       ;;
#     *)
#       echo '{"data": null, "output_to_chain": false, "error": "Unknown action: '"$ACTION"'"}'
#       exit 0
#       ;;
#   esac
#
# Log messages to stderr (captured and sent back with response):
#   echo "Processing transaction..." >&2

# Parse transaction data
TXN_ID=$(echo "$TX_JSON" | jq -r '.header.txn_id')
TXN_TYPE=$(echo "$TX_JSON" | jq -r '.header.txn_type')
PAYLOAD=$(echo "$TX_JSON" | jq -c '.payload')

echo "Processing transaction $TXN_ID (type: $TXN_TYPE)" >&2

# Default implementation: echo back the transaction
jq -n \
  --arg txn_id "$TXN_ID" \
  --arg txn_type "$TXN_TYPE" \
  --argjson payload "$PAYLOAD" \
  '{
    "data": {
      "status": "processed",
      "transaction_id": $txn_id,
      "txn_type": $txn_type,
      "payload": $payload,
      "message": "Transaction processed successfully"
    },
    "output_to_chain": true,
    "error": ""
  }'