#include <PatternHandler.h>

PatternHandler::PatternHandler(
    const String& pattern,
    const HTTPMethod method,
    const PatternHandler::TPatternHandlerFn fn)
  : _pattern(new char[pattern.length() + 1]),
    patternTokens(NULL),
    method(method),
    fn(fn)
{
  strcpy(_pattern, pattern.c_str());
  patternTokens = new TokenIterator(_pattern, pattern.length(), '/');
}

PatternHandler::~PatternHandler() {
  delete _pattern;
  delete patternTokens;
}

bool PatternHandler::canHandle(HTTPMethod requestMethod, String requestUri) {
  if (this->method != HTTP_ANY && requestMethod != this->method) {
    return false;
  }

  bool canHandle = true;

  char requestUriCopy[requestUri.length() + 1];
  strcpy(requestUriCopy, requestUri.c_str());
  TokenIterator requestTokens(requestUriCopy, requestUri.length(), '/');

  patternTokens->reset();
  while (patternTokens->hasNext() && requestTokens.hasNext()) {
    const char* patternToken = patternTokens->nextToken();
    const char* requestToken = requestTokens.nextToken();

    if (patternToken[0] != ':' && strcmp(patternToken, requestToken) != 0) {
      canHandle = false;
      break;
    }

    if (patternTokens->hasNext() != requestTokens.hasNext()) {
      canHandle = false;
      break;
    }
  }

  return canHandle;
}

bool PatternHandler::handle(ESP8266WebServer& server, HTTPMethod requestMethod, String requestUri) {
  if (! canHandle(requestMethod, requestUri)) {
    return false;
  }

  char requestUriCopy[requestUri.length()];
  strcpy(requestUriCopy, requestUri.c_str());
  TokenIterator requestTokens(requestUriCopy, requestUri.length(), '/');

  UrlTokenBindings bindings(*patternTokens, requestTokens);
  fn(&bindings);

  return true;
}