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/*

 *

 *  Copyright (C) 2010  Mattias Runge

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License along

 *  with this program; if not, write to the Free Software Foundation, Inc.,

 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

#include <string>

#include <vector>

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <pwd.h>

#include <boost/lexical_cast.hpp>

#include <boost/thread/mutex.hpp>

#include <boost/thread/condition.hpp>

#include <boost/thread/locks.hpp>

#include <boost/algorithm/string.hpp>

#include "net/Manager.h"

#include "net/Subscriber.h"

#include "net/types.h"

#include "type/common.h"

#include <readline/readline.h>

#include <readline/history.h>

using namespace atom;

void Handler(int status);

void CleanUp();

char* AutoCompleteGet(const char* text, int state);

static char** AutoComplete(const char* text, int start, int end);

type::StringList autocomplete_list;

char* buffer = NULL;

bool waiting_for_autocomplete = false;

boost::condition on_message_condition;

boost::mutex guard_mutex;

class ConsoleClient : public net::Subscriber

{

public:

    typedef boost::shared_ptr<ConsoleClient> Pointer;

    ConsoleClient(std::string address, unsigned int port)

    {

        this->client_id_ = net::Manager::Instance()->Connect(net::PROTOCOL_TCP, address, port);

    }

    virtual ~ConsoleClient()

    {

        net::Manager::Instance()->Disconnect(this->client_id_);

        this->io_service_.stop();

    }

    void Send(std::string data)

    {

        net::Manager::Instance()->SendTo(this->client_id_, data);

    }

    bool IsConnected()

    {

        return this->client_id_ != 0;

    }

private:

    net::ClientId client_id_;

    void SlotOnNewStateHandler(net::ClientId client_id, net::ServerId server_id, net::ClientState client_state)

    {

        if (client_state == net::CLIENT_STATE_CONNECTED)

        {

            printf("Connected to Atom Daemon!\n");

        }

        else

        {

            printf("\nDisconnected!\n");

            this->client_id_ = 0;

            kill(getpid(), SIGTERM);

        }

    }

    void SlotOnNewDataHandler(net::ClientId client_id, net::ServerId server_id, type::Byteset data)

    {

        std::string s(data.ToCharString());

        if (waiting_for_autocomplete)

        {

            autocomplete_list.clear();

            boost::algorithm::trim_if(s, boost::is_any_of("\n"));

            boost::algorithm::trim_if(s, boost::is_any_of(" "));

            if (s != "")

            {

                boost::algorithm::split(autocomplete_list, s, boost::is_any_of("\n"), boost::algorithm::token_compress_on);

            }

        }

        else

        {

            if (s[s.length()-1] != '\n')

            {

                s += "\n";

            }

            printf("%s", s.data());

        }

        on_message_condition.notify_all();

    }

};

ConsoleClient::Pointer cc;

struct termios original_flags;

std::string history_filename;

int main(int argc, char **argv)

{

    signal(SIGTERM, Handler);

    signal(SIGINT, Handler);

    signal(SIGQUIT, Handler);

    signal(SIGABRT, Handler);

    signal(SIGPIPE, Handler);

    tcgetattr(fileno(stdin), &original_flags);

    printf("Atom Interactive Console, version 1.5.0 starting...\n");

    printf("Written by Mattias Runge 2010.\n");

    printf("Released under GPL version 2.\n");

    net::Manager::Create();

    std::string address = "localhost";

    unsigned int port = 1202;

    printf("Connecting to %s:%d...", address.data(), port);

    try

    {

        cc = ConsoleClient::Pointer(new ConsoleClient(address, port));

    }

    catch (std::runtime_error& e)

    {

        printf("%s\n", e.what());

        CleanUp();

        return EXIT_FAILURE;

    }

    printf("success!\n");

    std::string prompt = address + ":" + boost::lexical_cast<std::string>(port) + "] ";

    passwd* user_struct = getpwuid(getuid());

    history_filename = std::string(user_struct->pw_dir) + "/.atomic_history";

    read_history(history_filename.data());

    rl_attempted_completion_function = AutoComplete;

    while ((buffer = readline(prompt.data())) != NULL)

    {

        if (strlen(buffer) == 0)

        {

            continue;

        }

        if (strcmp(buffer, "quit") == 0)

        {

            break;

        }

        waiting_for_autocomplete = false;

        cc->Send("E;" + std::string(buffer));

        boost::mutex::scoped_lock guard(guard_mutex);

        on_message_condition.wait(guard);    

        add_history(buffer);

    }

    CleanUp();

    return EXIT_SUCCESS;

}

static char** AutoComplete(const char* text, int start, int end)

{

    unsigned int count = 0;

    //printf("\nAutoComplete:start=%d, end=%d\n", start, end);

    for (unsigned int n = 0; n < start; n++)

    {

        if (rl_line_buffer[n] == ' ')

        {

            count++;

        }

    }

    waiting_for_autocomplete = true;

    std::string request = "A;"+ boost::lexical_cast<std::string>(count) + ";" + std::string(rl_line_buffer);

    //printf("\nSending request:%s\n", request.data());

    cc->Send(request);

    boost::mutex::scoped_lock guard(guard_mutex);

    on_message_condition.wait(guard);    

    if (autocomplete_list.size() == 0)

    {

        return NULL;

    }

    //printf("processing response\n");

    return rl_completion_matches(text, &AutoCompleteGet);

}

char* AutoCompleteGet(const char* text, int state)

{

    static int index = 0;

    int length = strlen(text);

    std::string name;

    //printf("run, %s, %d, %d\n", text, state, autocomplete_list.size());

    if (!state) // First run

    {

        index = 0;

    }

    while (autocomplete_list.size() > index)

    {

        name = autocomplete_list[index];

        //printf("testing name = %s\n", name.data());

        index++;

        if (strncmp(name.data(), text, length) == 0)

        {

            char *result = (char*)malloc(name.size() + 1);

            strcpy(result, name.data());

            return result;

        }

    }

    return NULL;

}

void CleanUp()

{

    printf("Cleaning up...\n");

    write_history(history_filename.data());

    cc.reset();

    net::Manager::Delete();

    if (buffer != NULL)

    {

        free(buffer);

    }

    printf("Thank you for using Atom. Goodbye!\n");

    tcsetattr(fileno(stdin), TCSANOW, &original_flags); // Restore

}

void Handler(int status)

{

    std::string signal_name = "Unknown";

    switch (status)

    {

        case SIGTERM:

        {

            signal_name = "Terminate";

            break;

        }  

        case SIGINT:

        {

            signal_name = "Interupt";

            break;

        }  

        case SIGQUIT:

        {

            signal_name = "Quit";

            break;

        }  

        case SIGABRT:

        {

            signal_name = "Abort";

            break;

        }  

        case SIGIO:

        {

            signal_name = "I/O";

            break;

        }  

        case SIGPIPE:

        {

            signal_name = "Pipe";

            break;

        }

    }

    if (status != SIGPIPE)

    {

        CleanUp();

        exit(0);

        //on_message_condition.notify_all();

    }

}