clc;
clear all;

max_queue_size = 200000;
max_facebook_node = 957359;
%D:\SocialNets\Facebook\Data
fileName = 'd:\\SocialNets\\Facebook\\Data\\mhrw-socialgraph-anonymized.txt';
dataset_out_dir = 'd:\\SocialNets\\DataSets6\\Facebook_June13\\';

if isdir(dataset_out_dir) == 0
    mkdir(dataset_out_dir);
end

%graph_size = 16384;
graph_size = 100000;
graph_sizes = [2000,5000,10000,15000,20000,25000,30000,35000,40000,50000,60000,70000,75000,80000,90000]; %,100000];
debugFlag = 0;
numIter = 10; %0;
startNodes = [779983  867168  121571  874428  605394  93381  266622  523561  916677  923744];
bfs_start_node = floor(rand(1) * max_facebook_node); %some node from the mhrw dataset

for iter = 4 : numIter-1
  
    while find(startNodes==bfs_start_node)
        bfs_start_node = floor(rand(1) * max_facebook_node); %some node from the mhrw dataset
    end
    startNodes = [startNodes bfs_start_node];
    
    %bfs_start_node =21632297; %most connected node in the uni dataset
    %bfs_start_node =72261595;

    date_now = clock;
    date_now = strcat(num2str(date_now(1)),'_',num2str(date_now(2)),'_', num2str(date_now(3)),'_', num2str(date_now(4)), num2str(date_now(5)),'_', num2str(date_now(6)));
    LogMsg(sprintf('%s Start Facebook_Crawl (%d of %d) starting from node %d ...',date_now, iter+1, numIter, bfs_start_node));
    
    curr_node = bfs_start_node;
    queue = [];
    developed_nodes = [];
    graph = [];
    curr_graph_size = 0;
    
    while curr_graph_size < graph_size
        %fprintf('Current Node: %d\n', curr_node);
        developed_nodes = [developed_nodes, curr_node];
        curr_neighbors = FindFacebookNeighbors_binary(fileName, curr_node);
        if curr_neighbors ~= -1
            curr_neighbors = curr_neighbors(curr_neighbors <= max_facebook_node);
            for j = 1 : size(curr_neighbors,1)
                %queue = union(curr_neighbors(j,:), queue); %add the new nodes to the queue but make it exclusive (no repetitions)
                queue = [queue, setdiff(curr_neighbors(j,:),queue)];
                %queue = [queue, curr_neighbors(j,:)]; %BFS
                if size(queue,2) > max_queue_size
                    queue = queue(1:max_queue_size);
                end
                curr_graph_size = curr_graph_size+1;
                graph{curr_graph_size} = curr_neighbors;

                % save incremental  netwroks
                % if curr_graph_size == 1024 || curr_graph_size==2048 || curr_graph_size==4096 || curr_graph_size==8192
                 if find(graph_sizes==curr_graph_size)
                     data = BuildFacebookData(graph);
                     networkName = sprintf('%sfacebook_sparse_%d_%d_%d', dataset_out_dir,curr_graph_size,iter,bfs_start_node);
                     LogMsg(sprintf('Saving %s',networkName));
                     save(networkName);
                     clear data;
                 end
            end
        end
        %queue = setdiff(queue, developed_nodes);  %remove nodes that were already developed from the queue - also sorts the queue
        
        if debugFlag == 1
            fprintf('graph size: %d, queue size: %d\n' , size(graph,2), size(queue,2));
        end
        if size(queue, 1) == 0
            fprintf('queue is empty');
            break;
        end
        while ismember(curr_node, developed_nodes)
            curr_node = queue(1);
            queue(1) = [];
        end
        %curr_node = queue(ceil(rand(1) * size(queue,2))); %select a random node from the queue
        
    end
    
    clear queue;
%    pack;

    % save final network
    data = BuildFacebookData(graph);
    networkName = sprintf('%sfacebook_sparse_%d_%d_%d', dataset_out_dir,curr_graph_size,iter,bfs_start_node);
    LogMsg(sprintf('Saving %s',networkName));
    save(networkName);
    clear data;
    
    LogMsg(strcat('startNodes ', sprintf(' %d ',startNodes)));
%    pack;
    
end