#include "server.h"

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

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

constexpr static const char* DOCUMENT_URI("DOCUMENT_URI");
constexpr static const char* DOCUMENT_ROOT("DOCUMENT_ROOT");

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

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

constexpr static const char* status405("Status: 405 Method Not Allowed");
constexpr static const char* status500("Status: 500 Internal Error");
constexpr static const char* status200("Status: 200 OK");
constexpr static const char* contentTypeHtml("Content-type: text/html");

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

constexpr static const char* svgHeader("image/svg+xml;charset=utf-8");

Server::Server():
    requestCount(0),
    serverName(std::nullopt)
{}

Server::~Server() {
}

void Server::handleRequest(FCGX_Request& request) {
    accountRequest(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;
    }

    writeHeader(os);
    try {
        std::string_view sPath = getPath(request);
        Response response(sPath);

    } catch (const std::exception e) {
        os << e.what();
    }
}

void Server::printEnv(std::ostream& out, FCGX_Request& request) {
    char **envp = request.envp;
    for (int i = 0; envp[i] != nullptr; ++i) {
        out << envp[i] << "</br>";
    }
}

void Server::writeHeader(std::ostream& out) {
    out << status200 << newLine;
    out << contentTypeHtml;
    out << headerEnd;
}

void Server::accountRequest(const FCGX_Request& request) {
    ++requestCount;

    if (!serverName.has_value()) {
        try {
            serverName = FCGX_GetParam(SERVER_NAME, request.envp);
            std::cout << "received server name " << serverName.value() << std::endl;
        } catch (...) {
            std::cout << "couldn't parse " << std::endl;
        }
    }
}

std::string_view Server::getPath(const FCGX_Request& request) {
    std::string_view path;
    if (serverName.has_value()) {
        const std::string& sn = serverName.value();
        std::string_view scriptFileName(FCGX_GetParam(SCRIPT_FILENAME, request.envp));

        std::string::size_type snLocation = scriptFileName.find(sn);
        if (snLocation != std::string::npos) {
            if (snLocation + sn.size() < scriptFileName.size()) {
                path = scriptFileName.substr(snLocation + sn.size() + 1);
            }
        }
    }

    return path;
}