#!/bin/bash

fn-available-tests() {
  declare PROCESSED_TEST_FILE="$1"
  AVAILABLE_TESTS="$(grep -o -E '^test_[^ ]+' "$PROCESSED_TEST_FILE")"
  AVAILABLE_TESTS=${AVAILABLE_TESTS//-28/(}
  AVAILABLE_TESTS=${AVAILABLE_TESTS//-29/)}
  AVAILABLE_TESTS=${AVAILABLE_TESTS//-3a/:}
  echo "$AVAILABLE_TESTS"
}

fn-matched-test() {
  declare TEST_NAME="$1" AVAILABLE_TESTS="$2"

  if [[ -z "$TEST_NAME" ]]; then
    return
  fi

  echo "$AVAILABLE_TESTS" | grep "$TEST_NAME" | head -1
}

fn-real-test-name() {
  declare TEST_NAME="$1"

  REAL_TEST_NAME=${TEST_NAME::-2}
  REAL_TEST_NAME=${REAL_TEST_NAME//(/-28}
  REAL_TEST_NAME=${REAL_TEST_NAME//)/-29}
  REAL_TEST_NAME=${REAL_TEST_NAME//:/-3a}
  echo "$REAL_TEST_NAME"
}

main() {
  declare TEST_FILE="$1" TEST_NAME="$2"
  local AVAILABLE_TESTS

  if [[ -z "$TEST_FILE" ]]; then
    echo "No test file specified"
    exit 1
  fi

  if [[ ! -e "$TEST_FILE" ]]; then
    echo "not found: '$TEST_FILE'"
    exit 1
  fi

  TMP_OUTPUT=$(mktemp "/tmp/${FUNCNAME[0]}.XXXX")
  trap 'rm -rf "$TMP_OUTPUT" >/dev/null' RETURN INT TERM EXIT

  /usr/local/libexec/bats-preprocess <"$TEST_FILE" >"$TMP_OUTPUT"
  AVAILABLE_TESTS="$(fn-available-tests "$TMP_OUTPUT")"
  MATCHED_TEST=$(fn-matched-test "$TEST_NAME" "$AVAILABLE_TESTS")

  if [[ -z "$MATCHED_TEST" ]]; then
    if [[ -n "$TEST_NAME" ]]; then
      echo "test '$TEST_NAME' not found in ${TEST_FILE}"
    fi

    echo "available test are:"
    echo "$AVAILABLE_TESTS"
    exit 1
  fi

  echo "Running test: ${MATCHED_TEST}"
  export BATS_TEST_SOURCE="$TMP_OUTPUT"
  /usr/local/libexec/bats-exec-test "$TEST_FILE" "$(fn-real-test-name "$MATCHED_TEST")"
}

main "$@"