#pragma once

#include <gmock/gmock.h>

#include <set>
#include <string>

#include <rublon/configuration.hpp>
#include <rublon/curl.hpp>

#include "core_response_generator.hpp"
#include "rublon/sign.hpp"

namespace {
rublon::Configuration conf{rublon::Configuration{//
  {"320BAB778C4D4262B54CD243CDEFFAFD"},
  {"39e8d771d83a2ed3cc728811911c25"},
  {"https://staging-core.rublon.net"},
  1,
  true,
  true,
  false,
  rublon::FailMode::safe}};
rublon::Configuration confBypass{rublon::Configuration{//
  {"320BAB778C4D4262B54CD243CDEFFAFD"},
  {"39e8d771d83a2ed3cc728811911c25"},
  {"https://staging-core.rublon.net"},
  1,
  true,
  true,
  false,
  rublon::FailMode::safe}};

inline std::string randomTID() {
    static const char alphanum[] =
      "0123456789"
      "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    std::string tmp_s;
    const auto len = 32;
    tmp_s.resize(len);

    std::for_each(tmp_s.begin(), tmp_s.end(), [](auto & chr) { chr = alphanum[rand() % (sizeof(alphanum) - 1)]; });

    return tmp_s;
}

std::string join_methods(std::set< std::string > _methods) {
    std::string ret;
    for(const auto & m : _methods)
        ret += "\"" + m + "\",";
    ret.pop_back();
    return ret;
}

} // namespace

struct ResponseMockOptions {
    bool generateBrokenSigneture{false};
    bool generateBrokenBody{false};
    bool generateBrokenCode{false};

    std::string coreException{};
    std::set< std::string > methods{};

    std::optional< rublon::Error > error;
};

class InitCoreResponse {
    static constexpr const char * result_ok_template =
      R"json({"status":"OK","result":{"tid":"%s","status":"%s","companyName":"%s","applicationName":"%s","methods":[%s]}})json";

    static constexpr const char * result_broken_template = //
      R"json({"some":"random","json":"notrublon"})json";

  public:
    static std::string generate(const ResponseMockOptions & options) {
        if(options.generateBrokenBody) {
            return result_broken_template;
        }

        std::array< char, 2048 > _buf;

        auto tid    = randomTID();
        auto status = "pending";
        std::string companyName{"rublon"};
        std::string applicationName{"test_app"};
        std::set< std::string > methods{"email", "totp", "qrcode", "push"};

        if(options.methods.size())
            methods = options.methods;

        io::sprintf(_buf.data(), result_ok_template, tid, status, companyName, applicationName, join_methods(methods));
        return _buf.data();
    }
};

class MethodSelectCoreResponse {
    static constexpr const char * result_ok_template =
      R"json({"status":"OK","result":{"tid":"%s","status":"%s","companyName":"%s","applicationName":"%s","methods":[%s]}})json";

    static constexpr const char * result_broken_template = //
      R"json({"some":"random","json":"notrublon"})json";

  public:
    static std::string generate(const ResponseMockOptions & options) {
        if(options.generateBrokenBody) {
            return result_broken_template;
        }

        std::array< char, 2048 > _buf;

        auto tid    = randomTID();
        auto status = "pending";
        std::string companyName{"rublon"};
        std::string applicationName{"test_app"};
        std::set< std::string > methods{"email", "totp", "qrcode", "push"};

        io::sprintf(_buf.data(), result_ok_template, tid, status, companyName, applicationName, join_methods(methods));
        return _buf.data();
    }
};

class CodeVerificationResponse {
    static constexpr const char * wrongPasscode =
      R"json({"status":"OK","result":{"error":"Hmm, that's not the right code. Try again."}})json";
    static constexpr const char * goodPasscode = R"json({"status":"OK","result":true})json";

  public:
    static std::string generate(const ResponseMockOptions & options) {
        return options.generateBrokenCode ? wrongPasscode : goodPasscode;
    }
};

class AuthenticationOkResponse {
    static constexpr const char * authOk = R"json({"status":"OK","result":true})json";

  public:
    static std::string generate(const ResponseMockOptions &) {
        return authOk;
    }
};

template < typename Generator >
class ResponseBase {
  public:
    Generator & initMessage() {
        _coreGenerator = InitCoreResponse{};
        return static_cast< Generator & >(*this);
    }

    Generator & selectMethodMessage() {
        _coreGenerator = MethodSelectCoreResponse{};
        return static_cast< Generator & >(*this);
    }

    Generator & codeConfirmationMessage() {
        _coreGenerator = CodeVerificationResponse{};
        return static_cast< Generator & >(*this);
    }

    Generator & authenticationSuccessfullMessage() {
        _coreGenerator = AuthenticationOkResponse{};
        return static_cast< Generator & >(*this);
    }

    Generator & withBrokenBody() {
        options.generateBrokenBody = true;
        return static_cast< Generator & >(*this);
    }

    Generator & withCoreException() {
        options.coreException = "some exception";
        return static_cast< Generator & >(*this);
    }

    Generator & withBrokenSignature() {
        options.generateBrokenSigneture = true;
        return static_cast< Generator & >(*this);
    }

    Generator & withWrongCodeResponse() {
        options.generateBrokenCode = true;
        return static_cast< Generator & >(*this);
    }

    Generator & withTimeoutError() {
        options.error = rublon::Error{rublon::ConnectionError{}};
        return static_cast< Generator & >(*this);
    }

    Generator & withServiceUnavailableError() {
        options.error = rublon::Error{rublon::ConnectionError{rublon::ConnectionError::HttpError, 405}};
        return static_cast< Generator & >(*this);
    }

    template < typename... T >
    Generator & withMethods(T... methods) {
        (options.methods.insert(methods), ...);
        return static_cast< Generator & >(*this);
    }

    Generator & withConnectionError() {
        //        options.error = rublon::Error{rublon::CoreHandlerError{rublon::CoreHandlerError::ConnectionError}};
        return static_cast< Generator & >(*this);
    }

    Generator & withBasSignature() {
        options.error = rublon::Error{rublon::CoreHandlerError{rublon::CoreHandlerError::BadSigature}};
        return static_cast< Generator & >(*this);
    }

    operator auto() {
        return not options.error.has_value() ? static_cast< Generator * >(this)->generate() : tl::unexpected{error()};
    }

    rublon::Error error() {
        return rublon::Error{options.error.value()};
    }

    std::variant< InitCoreResponse, MethodSelectCoreResponse, CodeVerificationResponse, AuthenticationOkResponse > _coreGenerator;
    ResponseMockOptions options;
};

class RawCoreResponse : public ResponseBase< RawCoreResponse > {
  public:
    tl::expected< rublon::Document, rublon::Error > generate() {
        static rublon::RapidJSONPMRAlloc alloc;
        auto jsonString = std::visit([&](const auto generator) { return generator.generate(options); }, _coreGenerator);
        rublon::Document doc{&alloc};
        doc.Parse(jsonString.c_str());
        return doc;
    }
};

class RawHttpResponse : public ResponseBase< RawHttpResponse > {
    rublon::Response & response;

  public:
    RawHttpResponse(rublon::Response & r)
     : ResponseBase< RawHttpResponse >(),
       response{r} {

       };
    static auto signResponse(rublon::Response & res, ResponseMockOptions opts) {
        const auto & sign = opts.generateBrokenSigneture ? std::array< char, 65 >{} : rublon::signData(res.body, conf.secretKey.data());
        res.headers["x-rublon-signature"] = sign.data();
    }
    tl::expected< std::reference_wrapper< rublon::Response >, rublon::Error > generate() {
        response.body = std::visit([&](const auto generator) { return generator.generate(options); }, _coreGenerator);
        signResponse(response, options);
        return response;
    }
};

class HttpHandlerMock {
  public:
    template < typename... Args >
    HttpHandlerMock(const Args &...) {}

    MOCK_METHOD(( tl::expected< std::reference_wrapper< rublon::Response >, rublon::Error > ),
      request,
      ( std::string_view, const rublon::Request & ),
      (const));

    tl::expected< std::reference_wrapper< rublon::Response >, rublon::Error >
    request(std::string_view uri, const rublon::Request & req, rublon::Response &) const {
        return request(uri, req);
    }
};