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/*  Starshatter: The Open Source Project
    Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
    Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
    Copyright (c) 1997-2006, Destroyer Studios LLC.

    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Network Server Pump for HTTP Server
*/

#include "HttpServletExec.h"

#include <stdio.h>

#include <cstdint>
#include <thread>

#include "HttpRequest.h"
#include "HttpResponse.h"
#include "HttpServer.h"
#include "HttpServlet.h"
#include "HttpSession.h"
#include "List.h"
#include "HttpParam.h"
#include "Utils.h"
#include "NetLayer.h"


class HttpTestServlet : public HttpServlet
{
public:
    HttpTestServlet()          { }
    virtual ~HttpTestServlet() { }

    virtual bool DoGet(HttpRequest& request,  HttpResponse& response)
    {
        char buffer[1024];
        Text content;

        content  = "<html><head><title>HttpTestServlet</title></head>\n";
        content += "<body bgcolor=\"#c0c0c0\" text=\"black\">\n<h1>HttpTestServlet</h1>\n";

        content += "<br><h3>HttpSessionId:</h3><p>\n";
        if (session)
            content += session->GetID();
        else
            content += "No Session Found";
        content += "<br>\n";

        content += "<br><h3>URI Requested:</h3><p>\n";
        content += request.URI();
        content += "<br>\n";

        if (request.GetQuery().size() > 0) {
            content += "<br><h3>Query Parameters:</h3>\n";

            ListIter<HttpParam> q_iter = request.GetQuery();
            while (++q_iter) {
                HttpParam* q = q_iter.value();
                sprintf_s(buffer, "<b>%s:</b> <i>%s</i><br>\n", q->name.data(), q->value.data());
                content += buffer;
            }
        }

        content += "<br><h3>Request Headers:</h3>\n";
        ListIter<HttpParam> h_iter = request.GetHeaders();
        while (++h_iter) {
            HttpParam* h = h_iter.value();
            sprintf_s(buffer, "<b>%s:</b> <i>%s</i><br>\n", h->name.data(), h->value.data());
            content += buffer;
        }

        if (request.GetCookies().size() > 0) {
            content += "<br><h3>Cookies:</h3>\n";
            ListIter<HttpParam> c_iter = request.GetCookies();
            while (++c_iter) {
                HttpParam* c = c_iter.value();
                sprintf_s(buffer, "<b>%s:</b> <i>%s</i><br>\n", c->name.data(), c->value.data());
                content += buffer;
            }
        }

        content += "</body></html>\n\n";

        response.SetStatus(HttpResponse::SC_OK);
        response.AddHeader("MIME-Version",  "1.0");
        response.AddHeader("Content-Type",  "text/html");
        response.SetContent(content);

        return true;
    }
};


HttpServletExec::HttpServletExec(std::uint16_t port, int poolsize) :
    HttpServer(port, poolsize),
    session_timeout(60),
    exec_shutdown(false)
{
    http_server_name = "Generic HttpServletExec 1.0";
    hsession = std::thread([&]{ CheckSessions(); });
}


HttpServletExec::~HttpServletExec()
{
    if (!exec_shutdown)
        exec_shutdown = true;

    if (hsession.joinable())
        hsession.join();

    sessions.destroy();
}


HttpServlet*
HttpServletExec::GetServlet(HttpRequest& request)
{
    return new HttpTestServlet;
}


HttpSession*
HttpServletExec::GetSession(HttpRequest& request)
{
    HttpSession* session = 0;
    Text         reqID   = request.GetCookie("SessionID");

    if (reqID.length() > 0) {
        ListIter<HttpSession> iter = sessions;
        while (++iter && !session) {
            HttpSession* s = iter.value();

            if (s->GetID() == reqID) {
                session = s;
                session->Access();
            }
        }
    }

    if (!session) {
        session = new HttpSession;
        if (session) {
            sessions.append(session);

            ::Print("HttpServletExec created new session '%s' for request '%s'\n",
                (const char*) session->GetID(),
                (const char*) request.RequestLine());
        }
        else {
            ::Print("HttpServletExec out of memory for request '%s'\n",
                (const char*) request.RequestLine());
        }
    }

    return session;
}


bool
HttpServletExec::DoGet(HttpRequest& request, HttpResponse& response)
{
    bool         result  = false;
    HttpSession* session = GetSession(request);
    HttpServlet* servlet = GetServlet(request);

    if (servlet) {
        servlet->SetSession(session);
        result = servlet->Service(request, response);
        delete servlet;
    }

    if (result) {
        response.SetHeader("Server", http_server_name);

        if (session)
            response.SetCookie("SessionID", session->GetID());
    }

    return result;
}


void
HttpServletExec::CheckSessions()
{
    while (!exec_shutdown) {
        sync.lock();

        if (sessions.size()) {
            ListIter<HttpSession> iter = sessions;
            while (++iter) {
                HttpSession* s = iter.value();

                if (NetLayer::GetUTC() - s->GetLastAccess() > session_timeout) {
                    ::Print("HttpServletExec deleting expired session '%s'\n", (const char*) s->GetID());
                    delete iter.removeItem();
                }
            }
        }

        DoSyncedCheck();

        sync.unlock();
        Sleep(100);
    }
}


void
HttpServletExec::DoSyncedCheck()
{
}