#!/bin/sh

. ./trace.sh
. ./sql.sh

do_callbacks_txid() {
  (
  flock -x 200 || return 0

  trace "Entering do_callbacks_txid()..."

  # Let's fetch all the watching txid still being watched but not called back
  local callbacks=$(sql 'SELECT id, txid, callback1conf, 1 FROM watching_by_txid WHERE watching AND callback1conf NOT NULL AND NOT calledback1conf')
  trace "[do_callbacks_txid] callbacks1conf=${callbacks}"

  local returncode
  local address
  local url
  local id
  local IFS=$'\n'
  for row in ${callbacks}
  do
    build_callback_txid ${row}
    returncode=$?
    trace_rc ${returncode}
    if [ "${returncode}" -eq "0" ]; then
      id=$(echo "${row}" | cut -d '|' -f1)
      sql "UPDATE watching_by_txid SET calledback1conf=1 WHERE id=\"${id}\""
      trace_rc $?
    else
      trace "[do_callbacks_txid] callback returncode has error, we don't flag as calledback yet."
    fi
  done

  local callbacks=$(sql 'SELECT id, txid, callbackxconf, nbxconf FROM watching_by_txid WHERE watching AND calledback1conf AND callbackxconf NOT NULL AND NOT calledbackxconf')
  trace "[do_callbacks_txid] callbacksxconf=${callbacks}"

  for row in ${callbacks}
  do
    build_callback_txid ${row}
    returncode=$?
    trace_rc ${returncode}
    if [ "${returncode}" -eq "0" ]; then
      id=$(echo "${row}" | cut -d '|' -f1)
      sql "UPDATE watching_by_txid SET calledbackxconf=1, watching=0 WHERE id=\"${id}\""
      trace_rc $?
    else
      trace "[do_callbacks_txid] callback returncode has error, we don't flag as calledback yet."
    fi
  done

  ) 200>./.callbacks.lock
}

build_callback_txid() {
  trace "Entering build_callback_txid()..."

  local row=$@
  local id
  local txid
  local url
  local nbxconf
  local blockhash
  local blockheight
  local confirmations
  local data
  local tx_raw_details

  # id, txid, url, nbconf

  trace "[build_callback_txid] row=${row}"
  id=$(echo "${row}" | cut -d '|' -f1)
  trace "[build_callback_txid] id=${id}"
  txid=$(echo "${row}" | cut -d '|' -f2)
  trace "[build_callback_txid] txid=${txid}"
  url=$(echo "${row}" | cut -d '|' -f3)
  trace "[build_callback_txid] url=${url}"
  nbxconf=$(echo "${row}" | cut -d '|' -f4)
  trace "[build_callback_txid] nbxconf=${nbxconf}"

  tx_raw_details=$(get_rawtransaction ${txid})
  returncode=$?
  trace_rc ${returncode}

  if [ "${returncode}" -eq "0" ]; then
    confirmations=$(echo "${tx_raw_details}" | jq '.result.confirmations')
    if [ "${confirmations}" == "null" ]; then
      confirmations=0
    fi
    trace "[build_callback_txid] confirmations=${confirmations}"

    if [ "${confirmations}" -ge "${nbxconf}" ]; then
      trace "[build_callback_txid] Number of confirmations for tx is at least what we're looking for, callback time!"

      # Sometimes raw tx are too long to be passed as paramater, so let's write
      # it to a temp file for it to be read by sqlite3 and then delete the file
      echo "${tx_raw_details}" > rawtx-${txid}-$$.blob

      # Number of confirmations for transaction is at least what we want
      # Let's prepare the callback!

      local tx_hash=$(echo "${tx_raw_details}" | jq '.result.hash')
      trace "[build_callback_txid] tx_hash=${tx_hash}"
      local tx_size=$(echo "${tx_raw_details}" | jq '.result.size')
      trace "[build_callback_txid] tx_size=${tx_size}"
      local tx_vsize=$(echo "${tx_raw_details}" | jq '.result.vsize')
      trace "[build_callback_txid] tx_vsize=${tx_vsize}"
      local fees=$(compute_fees "${txid}")
      trace "[build_callback_txid] fees=${fees}"
      local tx_blockhash=$(echo "${tx_raw_details}" | jq '.result.blockhash')
      trace "[build_callback_txid] tx_blockhash=${tx_blockhash}"
      local tx_blockheight=$(get_block_info $(echo ${tx_blockhash} | tr -d '"') | jq '.result.height')
      trace "[build_callback_txid] tx_blockheight=${tx_blockheight}"
      local tx_blocktime=$(echo "${tx_raw_details}" | jq '.result.blocktime')
      trace "[build_callback_txid] tx_blocktime=${tx_blocktime}"

      data="{\"id\":\"${id}\","
      data="${data}\"txid\":\"${txid}\","
      data="${data}\"hash\":${tx_hash},"
      data="${data}\"confirmations\":${confirmations},"
      data="${data}\"size\":${tx_size},"
      data="${data}\"vsize\":${tx_vsize},"
      data="${data}\"fees\":${fees},"
      data="${data}\"blockhash\":${tx_blockhash},"
      data="${data}\"blocktime\":\"$(date -Is -d @${tx_blocktime})\","
      data="${data}\"blockheight\":${tx_blockheight}}"
      trace "[build_callback_txid] data=${data}"

      curl_callback_txid "${url}" "${data}"
      returncode=$?

      # Delete the temp file containing the raw tx (see above)
      rm rawtx-${txid}-$$.blob

      return ${returncode}
    else
      trace "[build_callback_txid] Number of confirmations for tx is not enough to call back."
      return 1
    fi
  else
    trace "[build_callback_txid] Couldn't get tx from the Bitcoin node."
    return 1
  fi
}

curl_callback_txid() {
  trace "Entering curl_callback_txid()..."

  local returncode

  notify_web "${1}" "${2}" ${TOR_TXID_WATCH_WEBHOOKS}
  returncode=$?
  trace_rc ${returncode}

  return ${returncode}
}