//
//  main.cpp
//  assignment-server
//
//  Created by Stephen Birarda on 7/1/13.
//  Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
//

#include <arpa/inet.h>
#include <fstream>
#include <queue>

#include <QtCore/QString>

#include <Assignment.h>
#include <PacketHeaders.h>
#include <SharedUtil.h>
#include <UDPSocket.h>

const int MAX_PACKET_SIZE_BYTES = 1400;

int main(int argc, const char* argv[]) {
    
    std::deque<Assignment> assignmentQueue;
    
    sockaddr_in senderSocket;
    unsigned char senderData[MAX_PACKET_SIZE_BYTES] = {};
    ssize_t receivedBytes = 0;
    
    UDPSocket serverSocket(ASSIGNMENT_SERVER_PORT);
    
    unsigned char assignmentPacket[MAX_PACKET_SIZE_BYTES];
    int numSendHeaderBytes = populateTypeAndVersion(assignmentPacket, PACKET_TYPE_DEPLOY_ASSIGNMENT);
    
    while (true) {
        if (serverSocket.receive((sockaddr*) &senderSocket, &senderData, &receivedBytes)) {
            if (senderData[0] == PACKET_TYPE_REQUEST_ASSIGNMENT) {
                // construct the requested assignment from the packet data
                Assignment requestAssignment(senderData, receivedBytes);
                
                qDebug() << "Received request for assignment:" << requestAssignment;
                qDebug() << "Current queue size is" << assignmentQueue.size();
                
                // make sure there are assignments in the queue at all
                if (assignmentQueue.size() > 0) {
                    
                    // enumerate assignments until we find one to give this client (if possible)
                    for (std::deque<Assignment>::iterator assignment = assignmentQueue.begin();
                         assignment != assignmentQueue.end();
                         assignment++) {
                        
                        bool eitherHasPool = (assignment->getPool() || requestAssignment.getPool());
                        bool bothHavePool = (assignment->getPool() && requestAssignment.getPool());
                        
                        // make sure there is a pool match for the created and requested assignment
                        // or that neither has a designated pool
                        if ((eitherHasPool && bothHavePool
                             && strcmp(assignment->getPool(), requestAssignment.getPool()) == 0)
                            || !eitherHasPool) {
                            assignmentQueue.erase(assignment);
                            
                            int numAssignmentBytes = assignment->packToBuffer(assignmentPacket + numSendHeaderBytes);
                            
                            // send the assignment
                            serverSocket.send((sockaddr*) &senderSocket,
                                              assignmentPacket,
                                              numSendHeaderBytes + numAssignmentBytes);
                        }
                    }
                }
            } else if (senderData[0] == PACKET_TYPE_CREATE_ASSIGNMENT && packetVersionMatch(senderData)) {
                // construct the create assignment from the packet data
                Assignment createdAssignment(senderData, receivedBytes);
                
                qDebug() << "Received a created assignment:" << createdAssignment;
                qDebug() << "Current queue size is" << assignmentQueue.size();
                
                // assignment server is on a public server
                // assume that the address we now have for the sender is the public address/port
                // and store that with the assignment so it can be given to the requestor later
                createdAssignment.setDomainSocket((sockaddr*) &senderSocket);
                
                // add this assignment to the queue
                assignmentQueue.push_back(createdAssignment);
            }
        }
    }    
}