#include "../include/manager.h"
#include "../include/server.h"
#include "../include/name_mapper.h"
#include "../include/tools.h"
#include <zim/entry.h>
#include <zim/item.h>

// Output generated via mustache templates sometimes contains end-of-line
// whitespace. This complicates representing the expected output of a unit-test
// as C++ raw strings in editors that are configured to delete EOL whitespace.
// A workaround is to put special markers (//EOLWHITESPACEMARKER) at the end
// of such lines in the expected output string and remove them at runtime.
// This is exactly what this function is for.
std::string removeEOLWhitespaceMarkers(const std::string& s)
{
  const std::regex pattern("//EOLWHITESPACEMARKER");
  return std::regex_replace(s, pattern, "");
}

std::string replace(std::string s, std::string pattern, std::string replacement)
{
  return std::regex_replace(s, std::regex(pattern), replacement);
}

using TestContextImpl = std::vector<std::pair<std::string, std::string> >;
struct TestContext : TestContextImpl {
  TestContext(const std::initializer_list<value_type>& il)
    : TestContextImpl(il)
  {}
};

std::ostream& operator<<(std::ostream& out, const TestContext& ctx)
{
  out << "Test context:\n";
  for ( const auto& kv : ctx )
    out << "\t" << kv.first << ": " << kv.second << "\n";
  out << std::endl;
  return out;
}


typedef httplib::Headers Headers;

Headers invariantHeaders(Headers headers)
{
  headers.erase("Date");
  return headers;
}

class ZimFileServer
{
public: // types
  typedef std::shared_ptr<httplib::Response>  Response;
  typedef std::vector<std::string> FilePathCollection;

  enum Options
  {
    NO_TASKBAR_NO_LINK_BLOCKING = 0,

    WITH_TASKBAR         = 1 << 1,
    WITH_LIBRARY_BUTTON  = 1 << 2,
    BLOCK_EXTERNAL_LINKS = 1 << 3,
    NO_NAME_MAPPER       = 1 << 4,

    WITH_TASKBAR_AND_LIBRARY_BUTTON = WITH_TASKBAR | WITH_LIBRARY_BUTTON,

    DEFAULT_OPTIONS = WITH_TASKBAR | WITH_LIBRARY_BUTTON
  };

public: // functions
  ZimFileServer(int serverPort, Options options, std::string libraryFilePath);
  ZimFileServer(int serverPort,
                Options options,
                const FilePathCollection& zimpaths,
                std::string indexTemplateString = "");
  ~ZimFileServer();

  Response GET(const char* path, const Headers& headers = Headers())
  {
    return client->Get(path, headers);
  }

  Response HEAD(const char* path, const Headers& headers = Headers())
  {
    return client->Head(path, headers);
  }

private:
  void run(int serverPort, std::string indexTemplateString = "");

private: // data
  kiwix::Library library;
  kiwix::Manager manager;
  std::unique_ptr<kiwix::NameMapper> nameMapper;
  std::unique_ptr<kiwix::Server> server;
  std::unique_ptr<httplib::Client> client;
  const Options options = DEFAULT_OPTIONS;
};

ZimFileServer::ZimFileServer(int serverPort, Options _options, std::string libraryFilePath)
: manager(&this->library)
, options(_options)
{
  if ( kiwix::isRelativePath(libraryFilePath) )
    libraryFilePath = kiwix::computeAbsolutePath(kiwix::getCurrentDirectory(), libraryFilePath);
  manager.readFile(libraryFilePath, true, true);
  run(serverPort);
}

ZimFileServer::ZimFileServer(int serverPort,
                             Options _options,
                             const FilePathCollection& zimpaths,
                             std::string indexTemplateString)
: manager(&this->library)
, options(_options)
{
  for ( const auto& zimpath : zimpaths ) {
    if (!manager.addBookFromPath(zimpath, zimpath, "", false))
      throw std::runtime_error("Unable to add the ZIM file '" + zimpath + "'");
  }
  run(serverPort, indexTemplateString);
}

void ZimFileServer::run(int serverPort, std::string indexTemplateString)
{
  const std::string address = "127.0.0.1";
  if (options & NO_NAME_MAPPER) {
    nameMapper.reset(new kiwix::IdNameMapper());
  } else {
    nameMapper.reset(new kiwix::HumanReadableNameMapper(library, false));
  }
  server.reset(new kiwix::Server(&library, nameMapper.get()));
  server->setRoot("ROOT");
  server->setAddress(address);
  server->setPort(serverPort);
  server->setNbThreads(2);
  server->setVerbose(false);
  server->setTaskbar(options & WITH_TASKBAR, options & WITH_LIBRARY_BUTTON);
  server->setBlockExternalLinks(options & BLOCK_EXTERNAL_LINKS);
  server->setMultiZimSearchLimit(3);
  if (!indexTemplateString.empty()) {
    server->setIndexTemplateString(indexTemplateString);
  }

  if ( !server->start() )
    throw std::runtime_error("ZimFileServer failed to start");

  client.reset(new httplib::Client(address, serverPort));
}

ZimFileServer::~ZimFileServer()
{
  server->stop();
}

class ServerTest : public ::testing::Test
{
protected:
  std::unique_ptr<ZimFileServer>   zfs1_;

  const ZimFileServer::FilePathCollection ZIMFILES {
    "./test/zimfile.zim",
    "./test/example.zim",
    "./test/poor.zim",
    "./test/corner_cases.zim"
  };

protected:
  void SetUp() override {
    resetServer(ZimFileServer::DEFAULT_OPTIONS);
  }

  void resetServer(ZimFileServer::Options options) {
    zfs1_.reset();
    zfs1_.reset(new ZimFileServer(SERVER_PORT, options, ZIMFILES));
  }

  void TearDown() override {
    zfs1_.reset();
  }
};