#include <iostream>
#include <string>
#include <fcgio.h>
#include <fcgiapp.h>

#include <unistd.h>

constexpr static const char* GET("GET");

constexpr static const char* REQUEST_METHOD("REQUEST_METHOD");
constexpr static const char* SCRIPT_NAME("SCRIPT_NAME");

constexpr static const char* status405("Status: 405 Method Not Allowed");
constexpr static const char* contentTypeHtml("Content-type: text/html");

constexpr static const char* headerEnd("\n\n");

void handleRequest(FCGX_Request& request) {
    fcgi_streambuf cin_fcgi_streambuf(request.in);
    fcgi_streambuf cout_fcgi_streambuf(request.out);
    fcgi_streambuf cerr_fcgi_streambuf(request.err);
    std::ostream os{&cout_fcgi_streambuf};
    std::ostream errs{&cerr_fcgi_streambuf};
    std::istream is{&cin_fcgi_streambuf};

    std::string requestMethod(FCGX_GetParam(REQUEST_METHOD, request.envp));
    if (requestMethod != GET) {
        os << status405;
        return;
    }

    std::string scriptName{FCGX_GetParam(SCRIPT_NAME, request.envp)};
    os << contentTypeHtml;
    os << headerEnd;
    os << scriptName << "\n";
}

int main() {
    FCGX_Request request;

    FCGX_Init();
    FCGX_InitRequest(&request, 0, 0);

    while (FCGX_Accept_r(&request) == 0) {
        handleRequest(request);
    }
}