/*
    Copyright © 2015 Gluzskiy Alexandr (sss)

    This file is part of Unknown Download Manager (UDM).

    UDM 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.

    UDM 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 UDM.  If not, see <http://www.gnu.org/licenses/>.

*/


#include "udm_main.h"
#include <QMenuBar>
#include <QThread>
#include <QMessageBox>
#include <QStatusBar>
#include <QLabel>
#include <QTableView>
#include <QTreeView>
#include <QTabWidget>
#include <QHeaderView>
#include <QSplitter>
#include <QStackedLayout>
#include <QPushButton>
#include <QToolBar>
#include <QMenu>
#include <QApplication>

#include <boost/log/trivial.hpp>

#include "connect_widget.h"
#include "client_session.h"
#include "downloads_model.h"
#include "filters_model.h"
#include "download_add_widget.h"


udm_main::udm_main(QWidget *parent)
    : QMainWindow(parent)
{
    io_service_ = new boost::asio::io_service;
    thread_client_session = new QThread(this);
    session = nullptr;
    auto menu_main = this->menuBar()->addMenu(tr("Main"));
    auto menu_connect = menu_main->addAction(tr("Connect"));
    connect(menu_connect, SIGNAL(triggered()), this, SLOT(show_connect_widget()));
    auto action_exit = menu_main->addAction(tr("Exit"));
    connect(action_exit, SIGNAL(triggered(bool)), this, SLOT(close())); //TODO: something better
    lbl_state = new QLabel;
    lbl_state->setText(tr("State") + ": " +  tr("Offline"));
    this->statusBar()->addPermanentWidget(lbl_state);

    tbl_downloads = new QTableView;
    tbl_downloads->setShowGrid(false);
    tbl_downloads->setUpdatesEnabled(true);
    mdl_downloads = new downloads_model(downloads);
    tbl_downloads->setModel(mdl_downloads);
    tbl_downloads->setContextMenuPolicy(Qt::CustomContextMenu);
    tbl_downloads->setSelectionBehavior(QAbstractItemView::SelectRows);
    tbl_downloads->setSortingEnabled(true);
    tbl_downloads->horizontalHeader()->setHighlightSections(false);
    tbl_downloads->horizontalHeader()->setMovable(true);
    tbl_downloads->horizontalHeader()->setDefaultAlignment(Qt::AlignLeft);
    tbl_downloads->setHorizontalScrollMode(QAbstractItemView::ScrollPerPixel);
    connect(tbl_downloads, SIGNAL(customContextMenuRequested(QPoint)), SLOT(downloads_menu(QPoint)));
    connect(tbl_downloads->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)), this, SLOT(downloads_selection_changed(QItemSelection,QItemSelection)));

    create_menu();

    tree_filters = new QTreeView;
    mdl_filters = new filters_model;
    tree_filters->setModel(mdl_filters);
    tree_filters->header()->hide();
    tree_filters->setSelectionMode(QAbstractItemView::ExtendedSelection);
    tree_filters->setSelectionBehavior(QAbstractItemView::SelectRows);
    tree_filters->setIndentation(10);

    spl_hor = new QSplitter(Qt::Horizontal);
    spl_hor->addWidget(tree_filters);
    spl_hor->addWidget(tbl_downloads);

    spl_hor->setStretchFactor(0, 2);
    spl_hor->setStretchFactor(1, 10);

    tabs_info = new QTabWidget;



    spl_vert = new QSplitter(Qt::Vertical);
    spl_vert->addWidget(spl_hor);
    spl_vert->addWidget(tabs_info);

    spl_vert->setStretchFactor(0, 3);
    spl_vert->setStretchFactor(1, 1);
    setCentralWidget(spl_vert);

    create_buttons();
}

void udm_main::create_menu()
{
    download_menu = new QMenu;
    QAction *a = download_menu->addAction(tr("Start"));
    connect(a, SIGNAL(triggered(bool)), this, SLOT(download_start()));
    a = download_menu->addAction(tr("Stop"));
    connect(a, SIGNAL(triggered(bool)), this, SLOT(download_stop()));
    a = download_menu->addAction(tr("Delete"));
    connect(a, SIGNAL(triggered(bool)), this, SLOT(download_delete()));
    //TODO: dynamic menu
}

void udm_main::downloads_menu(const QPoint &/*pos*/)
{
    download_menu->popup(QCursor::pos());
}


void udm_main::download_start()
{
    client_msg msg;
    msg.set_auth_token(auth_token);
    for(auto i : tbl_downloads->selectionModel()->selectedRows())
    {
        msg.set_type(CLIENT_MSG_TYPE::CLIENT_DOWNLOAD_START);
        client_download_start_request *r = msg.add_download_start_request();
        r->set_download_id(downloads[i.row()].id());
    }
    session->send_message(msg);
}

void udm_main::download_stop()
{
    client_msg msg;
    msg.set_auth_token(auth_token);
    for(auto i : tbl_downloads->selectionModel()->selectedRows())
    {
        msg.set_type(CLIENT_MSG_TYPE::CLIENT_DOWNLOAD_STOP);
        client_download_stop_request *r = msg.add_download_stop_request();
        r->set_download_id(downloads[i.row()].id());
    }
    session->send_message(msg);
}

void udm_main::download_delete()
{
    client_msg msg;
    msg.set_auth_token(auth_token);
    for(auto i : tbl_downloads->selectionModel()->selectedRows())
    {
        msg.set_type(CLIENT_MSG_TYPE::CLIENT_DOWNLOAD_DELETE);
        client_download_delete_request *r = msg.add_download_delete_request();
        r->set_download_id(downloads[i.row()].id());
    }
    session->send_message(msg);
}

void udm_main::downloads_selection_changed(QItemSelection s, QItemSelection)
{
    if(s.size())
    {
        btn_start->setEnabled(true);
        btn_stop->setEnabled(true);
        btn_del->setEnabled(true);
    }
    else
    {
        btn_start->setEnabled(false);
        btn_stop->setEnabled(false);
        btn_del->setEnabled(false);
    }

}


udm_main::~udm_main()
{
    if(thread_client_session)
    {
        thread_client_session->quit();
        thread_client_session->deleteLater();
        //delete thread_client_session;
    }
    //TODO: clear all remaining data
}

void udm_main::show_connect_widget()
{
    connect_widget *w = new connect_widget;
    connect(w, SIGNAL(client_connect(QString&,QString&,int)), this, SLOT(client_connect(QString&,QString&,int)));
    //TODO: make connection to other slots related to connection
    //TODO: destroy widget on close
    w->show();
}

void udm_main::client_pre_connect_init()
{
  if(session)
    {
      session->moveToThread(QApplication::instance()->thread());
      thread_client_session->quit();
      io_service_->stop();
      delete session;
    }
    session = new client_session(0, io_service_); //parent must be 0 here
    connect(session, SIGNAL(server_message_received(server_msg)), this, SLOT(server_message_received(server_msg)));
    connect(session, SIGNAL(client_connected(bool,QString)), this, SLOT(client_connected(bool,QString)));
    connect(session, SIGNAL(client_disconnected()), this, SLOT(client_disconnected()));
    connect(session, SIGNAL(terminate_thread()), thread_client_session, SLOT(quit()));
}
void udm_main::client_connect_finalize()
{
    session->moveToThread(thread_client_session);
    thread_client_session->start();
}

void udm_main::client_connect(QString &host, QString &password, int port)
{
    client_pre_connect_init();
    connect(this, SIGNAL(connect_signal(QString,QString,int)), session, SLOT(client_connect(QString,QString,int)));
    client_connect_finalize();
    emit connect_signal(host, password, port);
}

void udm_main::client_connect_ssl(QString &host, QString &password, int port, QString &ssl_ca, QString &ssl_crt, QString &ssl_key)
{
    client_pre_connect_init();
    connect(this, SIGNAL(connect_signal(QString,QString,int,QString,QString)), session, SLOT(client_connect(QString,QString,int,QString,QString)));
    client_connect_finalize();
    emit connect_signal_ssl(host, password, port, ssl_ca, ssl_crt, ssl_key);
}

void udm_main::server_message_received(server_msg msg)
{
    BOOST_LOG_TRIVIAL(trace)<<"recieved server message\n"<<msg.DebugString();
    switch(msg.type())
    {
    case SERVER_MSG_TYPE::SERVER_AUTH_REPLY:
    {
        if(msg.auth_reply().status())
        {
            auth_token = msg.auth_reply().auth_token();
            lbl_state->setText(tr("State") + ": " + tr("Connected") + ", " + tr("Authenticated"));
            //TODO: subscript to events
            //request modules and settings here
            {
                client_msg msg;
                msg.set_type(CLIENT_MSG_TYPE::CLIENT_CORE_INFO_REQUEST);
                msg.set_auth_token(auth_token);
                session->send_message(msg);
            }
            {
                client_msg msg;
                msg.set_type(CLIENT_MSG_TYPE::CLIENT_MODULES_REQUEST);
                msg.set_auth_token(auth_token);
                session->send_message(msg);
            }
            {
                client_msg msg;
                msg.set_type(CLIENT_MSG_TYPE::CLIENT_DOWNLOADS_LIST_REQUEST);
                msg.set_auth_token(auth_token);
                session->send_message(msg);
            }
            //subscript to needed events
            {
                client_msg msg;
                msg.set_type(CLIENT_MSG_TYPE::CLIENT_SUBSCRIPTION_REQUEST);
                msg.set_auth_token(auth_token);
                //subscript to download added event
                auto s = msg.add_subscription_request();
                s->set_type(SUBSCRIPTION_TYPE::ST_DOWNLOAD_ADDED); //fire event than new download added
                s->set_mode(SUBSCRIPTION_MODE::SM_EVENT); //this type of event support only "event" mode
                s->set_module_name(""); //we need this event for all installed modules

                s = msg.add_subscription_request();
                s->set_type(SUBSCRIPTION_TYPE::ST_DOWNLOAD_DELETED); //fire event than new download deleted
                s->set_mode(SUBSCRIPTION_MODE::SM_EVENT); //this type of event support only "event" mode
                s->set_module_name(""); //we need this event for all installed modules


                s = msg.add_subscription_request();
                s->set_type(SUBSCRIPTION_TYPE::ST_DOWNLOAD_STATE_CHANGE); //fire event than download state changed
                s->set_mode(SUBSCRIPTION_MODE::SM_EVENT);
                s->set_module_name("");
                s->mutable_download_state_change()->add_states(SDS_STARTED); //subscript to download started event
                s->mutable_download_state_change()->add_states(SDS_STOPPED); //subscript to download stopped event
                s->mutable_download_state_change()->add_states(SDS_DELETED); //subscript to download deleted event
                s->mutable_download_state_change()->add_states(SDS_COMPLETED); //subscript to download completed event

                session->send_message(msg);
            }
            btn_add->setEnabled(true); //we can add downloads now
        }
        else
        {
            QMessageBox msg_box;
            msg_box.setText(tr("Authentication failed with error:") + "\n" + msg.auth_reply().error_description().c_str());
            msg_box.exec();
            lbl_state->setText(tr("State") + ": " + tr("auth error"));
        }

    }
        break;
    case SERVER_MSG_TYPE::SERVER_CORE_INFO_REPLY:
        server_info = msg.server_core_info_reply();
        break;
    case SERVER_MSG_TYPE::SERVER_MODULES_REPLY:
    {
        modules.clear(); //TODO: something better
        for(auto i : msg.server_modules_reply())
            modules.push_back(i);
    }
        break;
    case SERVER_MSG_TYPE::SERVER_DOWNLOADS_LIST_REPLY:
    {
        if(!downloads.empty())
        {
            mdl_downloads->removeRows(0, downloads.size());
            downloads.clear(); //TODO: something better
        }
        for(auto i : msg.downloads())
            downloads.push_back(i.download());
        //TODO: something better than whole list rebuild
        mdl_downloads->insertRows(0, downloads.size());
        mdl_downloads->refresh();
    }
        break;
    case SERVER_MSG_TYPE::SERVER_DOWNLOAD_INFO_REPLY:
    {
        bool found = false;
        for(auto i : downloads)
        {
            if(i.id() == msg.download().download().id())
            {
                //TODO: merge download, not replace ?
                i = msg.download().download();
                found = true;
                break;
            }
        }
        if(!found)
            downloads.push_back(msg.download().download());
        mdl_downloads->insertRows(downloads.size(), 1);
        mdl_downloads->refresh();
    }
        break;
    case SERVER_MSG_TYPE::SERVER_DOWNLOAD_STATE_CHANGE:
    {
        for(auto i : msg.download_state_changes())
        {
            switch(i.state())
            {
            case SUBSCRIPTION_DOWNLOAD_STATE::SDS_STARTED:
                for(auto d = downloads.begin(), end = downloads.end(); d != end; ++d)
                {
                    if(d->id() == i.download_id())
                    {
                        d->set_state(1); //TODO: use human readable enum for states ?
                        mdl_downloads->refresh(); //TODO: udapte only changed item
                        break;
                    }
                }
                break;
            case SUBSCRIPTION_DOWNLOAD_STATE::SDS_STOPPED:
                for(auto d = downloads.begin(), end = downloads.end(); d != end; ++d)
                {
                    if(d->id() == i.download_id())
                    {
                        d->set_state(0); //TODO: use human readable enum for states ?
                        mdl_downloads->refresh(); //TODO: udapte only changed item
                        break;
                    }
                }
                break;
            case SUBSCRIPTION_DOWNLOAD_STATE::SDS_COMPLETED:
                for(auto d = downloads.begin(), end = downloads.end(); d != end; ++d)
                {
                    if(d->id() == i.download_id())
                    {
                        d->set_state(2); //TODO: use human readable enum for states ?
                        mdl_downloads->refresh(); //TODO: udapte only changed item
                        break;
                    }
                }
                break;
            case SUBSCRIPTION_DOWNLOAD_STATE::SDS_DELETED:
            {
                bool found = false;
                unsigned int pos = 0;
                for(auto d = downloads.begin(), end = downloads.end(); d != end; ++d, ++pos)
                {
                    if(d->id() == i.download_id())
                    {
                        found = true;
                        downloads.erase(d);
                        mdl_downloads->removeRows(pos, 1);
                        break;
                    }
                    if(!found)
                        BOOST_LOG_TRIVIAL(error)<<"error: deleted download which is not exist\n"<<msg.DebugString();
                }
            }
                break;
            default:
                BOOST_LOG_TRIVIAL(error)<<"error: unhandled download state in server message message\n"<<msg.DebugString();
                break;
            }
        }

    }
        break;
    default:
        BOOST_LOG_TRIVIAL(debug)<<"unhandled server message\n"<<msg.DebugString();
        break;
    }
}

void udm_main::create_buttons()
{
    btn_start = new QPushButton(this);
    btn_start->setEnabled(false);
    connect(btn_start, SIGNAL(clicked(bool)), this, SLOT(btn_start_clicked()));
    btn_stop = new QPushButton(this);
    btn_stop->setEnabled(false);
    connect(btn_stop, SIGNAL(clicked(bool)), this, SLOT(btn_stop_clicked()));
    btn_del = new QPushButton(this);
    btn_del->setEnabled(false);
    connect(btn_del, SIGNAL(clicked(bool)), this, SLOT(btn_del_clicked()));
    btn_add = new QPushButton(this);
    btn_add->setEnabled(false);
    connect(btn_add, SIGNAL(clicked(bool)), this, SLOT(btn_add_clicked()));
    button_bar = new QToolBar(this);
    button_bar->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    //TODO: support dynamic action buttons for modules
    button_bar->addWidget(btn_start);
    button_bar->addWidget(btn_stop);
    button_bar->addSeparator();
    button_bar->addWidget(btn_del);
    button_bar->addWidget(btn_add);
    btn_start->setText(tr("Start"));
    btn_start->setToolTip(tr("Start download"));
    btn_start->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    btn_stop->setText(tr("Stop"));
    btn_stop->setToolTip(tr("Stop download"));
    btn_stop->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    btn_del->setText(tr("Delete"));
    btn_del->setToolTip(tr("Delete download"));
    btn_del->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    btn_add->setText(tr("Add"));
    btn_add->setToolTip(tr("Add download"));
    btn_add->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);

    this->addToolBar(button_bar);

}

void udm_main::btn_start_clicked()
{
    download_start();
}

void udm_main::btn_stop_clicked()
{
    download_stop();
}

void udm_main::btn_add_clicked()
{
    download_add_widget *w = new download_add_widget(modules);
    connect(w, SIGNAL(got_download_settings(std::string, std::map<int,std::string>)), this, SLOT(got_download_settings(std::string, std::map<int,std::string>)));
    w->show();
}

void udm_main::got_download_settings(std::string module_name, std::map<int, std::string> settings)
{
    if(!settings.empty())
    {
        client_msg msg;
        msg.set_auth_token(auth_token);
        msg.set_type(CLIENT_MSG_TYPE::CLIENT_DOWNLOAD_ADD);
        client_download_add_request *r = msg.mutable_download_add_request();
        r->set_module_name(module_name);
        for(auto i : settings)
        {
            int_string_pair *p = r->add_params();
            p->set_id(i.first);
            p->set_value(i.second);
        }
        session->send_message(msg);
    }
}

void udm_main::btn_del_clicked()
{
    download_delete();
}


void udm_main::client_connected(bool success, QString error_text)
{
    if(!success)
    {
        QMessageBox msg;
        msg.setText(tr("client connection error with error:") + error_text);
        msg.exec();
        lbl_state->setText(tr("State") + ": " + tr("Connection error"));
        btn_add->setEnabled(false);
        btn_del->setEnabled(false);
        btn_start->setEnabled(false);
        btn_stop->setEnabled(false);
    }
    else
    {
        lbl_state->setText(tr("State") + ": " + tr("Connected"));
    }
/*    QMessageBox msg;
    msg.setText(success?"client connected with message:":"client connection error with error:" + error_text);
    msg.exec(); */
}

void udm_main::client_disconnected()
{
    btn_add->setEnabled(false);
    btn_del->setEnabled(false);
    btn_start->setEnabled(false);
    btn_stop->setEnabled(false);
    //TODO: disable all actions which require alive connection
    lbl_state->setText(tr("State") + ": " + tr("Disconnected"));
}