#!/usr/bin/env bash

function error_handler() {
  >&2 echo "Exited with BAD EXIT CODE '${2}' in ${0} script at line: ${1}."
  exit "$2"
}
trap 'error_handler ${LINENO} $?' ERR
set -o errtrace -o errexit -o nounset -o pipefail

# sort of like https://lithic.tech/blog/2020-05/react-dynamic-config, but without golang
react_configs=$(env | grep -E "^SPIFFWORKFLOW_FRONTEND_RUNTIME_CONFIG_" || echo '')
if [[ -n "$react_configs" ]]; then
  index_html_file="./build/index.html"
  if [[ ! -f "$index_html_file" ]]; then
    >&2 echo "ERROR: Could not find '${index_html_file}'. Cannot use SPIFFWORKFLOW_FRONTEND_RUNTIME_CONFIG values without it."
    exit 1
  fi

  if ! command -v sed >/dev/null ; then
    >&2 echo "ERROR: sed command not found. Cannot use SPIFFWORKFLOW_FRONTEND_RUNTIME_CONFIG values without it."
    exit 1
  fi

  if ! command -v perl >/dev/null ; then
    >&2 echo "ERROR: perl command not found. Cannot use SPIFFWORKFLOW_FRONTEND_RUNTIME_CONFIG values without it."
    exit 1
  fi

  for react_config in $react_configs; do
    react_config_without_prefix=$(sed -E 's/^SPIFFWORKFLOW_FRONTEND_RUNTIME_CONFIG_([^=]*)=(.*)/\1=\\"\2\\"/' <<<"${react_config}")

    if [[ -z "$react_config_without_prefix" ]]; then
      >&2 echo "ERROR: Could not parse react config line: '${react_config}'."
      exit 1
    fi

    # actually do the search and replace to add the js config to the html page
    perl -pi -e "s/(window.spiffworkflowFrontendJsenv=\{\})/\1;window.spiffworkflowFrontendJsenv.${react_config_without_prefix}/" "$index_html_file"

    if ! grep -Eq "${react_config_without_prefix}" "$index_html_file"; then
      >&2 echo "ERROR: Could not find '${react_config_without_prefix}' in '${index_html_file}' after search and replace. It is likely that the assumptions in boot_server_in_docker about the contents of the html page have changed. Fix the glitch in boot_server_in_docker."
      exit 1
    fi
  done
fi

exec ./node_modules/.bin/serve -s build -l "$PORT0"