#include "mainwindow.hpp"
#include "functions.hpp"
#include "filesystem.hpp"
#include "tv_rename.hpp"
#include <gtkmm/liststore.h>
#include <gtkmm/filechooserdialog.h>
#include <gtkmm/messagedialog.h>
#include <gtkmm/textview.h>
#include <iostream>
#include <fstream>

constexpr std::array<const char *, 46> languages{
    "en", "English", "sv", "Svenska", "no", "Norsk", "da", "Dansk", "fi", "Suomeksi",
    "nl", "Nederlands", "de", "Deutsch", "it", "Italiano", "es", "Español", "fr", "Français",
    "pl", "Polski", "hu", "Magyar", "el", "Greek", "tr", "Turkish", "ru", "Russian",
    "he", "Hebrew", "ja", "Japanese", "pt", "Portuguese", "zh", "Chinese", "cs", "Czech",
    "sl", "Slovenian", "hr", "Croatian", "ko","Korea"
};

void MainWindow::chooseFile() {
    // create a dialog for choosing directory
    Gtk::FileChooserDialog dialog("Select a directory",
            Gtk::FILE_CHOOSER_ACTION_SELECT_FOLDER);
    dialog.set_transient_for(*this);
    // add cancel and select buttons
    dialog.add_button("_Cancel", Gtk::RESPONSE_CANCEL);
    dialog.add_button("Select", Gtk::RESPONSE_OK);

    auto result = dialog.run();

    switch(result) {
    case Gtk::RESPONSE_OK:
        m_entry_dir.set_text(dialog.get_filename());
        std::cout << dialog.get_filename() << std::endl;
        break;
    case Gtk::RESPONSE_CANCEL:
        std::cout << "Canceled" << std::endl;
        break;
    default:
        std::cout << "Closed dialog" << std::endl;
        break;
    }
}

void MainWindow::quit() {
    std::cout << "Quitting" << std::endl;
    hide();
}

void MainWindow::patternHelp() {
    Gtk::MessageDialog dialog(*this, "Pattern escape sequences");
    dialog.set_secondary_text( "%filename - original filename (without type extension)\n"
            "%show - show name from thetvdb\n"
            "%epname - episode name from thetvdb\n"
            "%season - season number\n"
            "%episode - episode number\n"
            "Both season number and episode number can be padded with zeros, just add width of padding"
            " right after %, like this: %2season.\n"
            "Default pattern is \"%filename - %epname\", you might want to change this to"
            " \"S%2seasonE%2episode - %epname\" or \"%show - S%2seasonE%2episode - %epname\""
    );
    dialog.run();
}

void MainWindow::process() {
    // check required fields are filled out
    if( m_entry_show.get_text().empty() ) {
        Gtk::MessageDialog dialog(*this, "Show field is empty");
        dialog.run();
        return;
    }

    // language code
    language_code = (*m_combo_language.get_active())[m_columns_language.m_col_code];

    // fill up m_combo_possible with possible tv shows
    auto possible_shows = getPossibleShows( std::string(m_entry_show.get_text()), language_code, c );

    // if no possible shows were found, tell the user
    if( possible_shows.size() == 0 ) {
        Gtk::MessageDialog dialog(*this, "No results found for given show name");
        dialog.run();
        return;
    }

    //show widgets
    m_label_possible.show();
    m_button_get_names.show();
    m_combo_possible.show();

    // fill up combo box with results from thetvdb
    auto model = Gtk::ListStore::create(m_columns_url);

    m_combo_possible.set_model(model);

    auto row = *(model->append());

    row[m_columns_url.m_col_show] = possible_shows[0].first;
    row[m_columns_url.m_col_url] = possible_shows[0].second;
    m_combo_possible.set_active(row);

    for( size_t i = 1; i < possible_shows.size(); i++ ) {
        auto row = *(model->append());
        row[m_columns_url.m_col_show] = possible_shows[i].first;
        row[m_columns_url.m_col_url] = possible_shows[i].second;
    }
}

void MainWindow::getNames() {
    // check required fields are filled out
    if( m_entry_dir.get_text().empty() ) {
        Gtk::MessageDialog dialog(*this, "Directory field is empty");
        dialog.run();
        return;
    }
    // check directory exists
    if( !FSLib::isDirectory(m_entry_dir.get_text()) ) {
        Gtk::MessageDialog dialog(*this, "Directory doesn't exist");
        dialog.run();
        return;
    }

    path = m_entry_dir.get_text();

    selected.clear();
    files.clear();
    
    std::vector<int> options;

    // get all files in path and seperate them in map `files` by season
    iterateFS(files, path);

    for( auto &x : files ) {
        options.push_back(x.first);
    }

    // create a window with possible seasons to rename
    // store selected seasons in `selected`
    sw = new SeasonWindow(options, selected);
    sw->signal_hide().connect(sigc::mem_fun(*this, &MainWindow::finishedSelection));

    app->add_window(*sw);
    sw->show();
}

/* change names of original files to generated new names
 * orig - original filenames
 * renamed - renamed filenames (sorted in the same order as `orig`)
 */
void renameFiles(const std::set<std::string> &orig, const std::vector<std::pair<std::string, std::string>> &renamed) {
    auto orig_it = orig.begin();

    for(auto renamed_it = renamed.begin(); renamed_it != renamed.end(); ++renamed_it) {
        std::cout << *orig_it << " --> " << renamed_it->first + "/" + renamed_it->second << std::endl;
        FSLib::rename(*orig_it, renamed_it->first + "/" + renamed_it->second);
        ++orig_it;
    }
}

void MainWindow::finishedSelection() {
    // remove created SeasonWindow and delete it from memory
    app->remove_window(*sw);
    delete sw;

    auto iter = m_combo_possible.get_active();

    // debug output
    std::cout << (*iter)[m_columns_url.m_col_show] << " " << language_code << std::endl;

    std::cout << "https://www.thetvdb.com" << static_cast<Glib::ustring>((*iter)[m_columns_url.m_col_url]) << std::endl;

    std::string input_pattern = m_entry_pattern.get_text();

    if( input_pattern != default_pattern ) {
        std::ofstream file(userHome() + "/.cache/tv_rename_pattern");
        if( file ) {
            file << input_pattern;
        }
    }

    for( auto &x : selected ) {
        // get renamed files for given season
        auto renamed_files = singleSeason( static_cast<Glib::ustring>((*iter)[m_columns_url.m_col_show]), x,
                "https://www.thetvdb.com" + static_cast<Glib::ustring>((*iter)[m_columns_url.m_col_url]),
                language_code,
                (input_pattern.empty() ? default_pattern : input_pattern),
                !m_check_linux.get_active(), c, files[x] );

        if( renamed_files.empty() )
            continue;

        // if trust checkbox is ticked, rename files
        if( m_check_trust.get_active() ) {
            renameFiles(files[x], renamed_files);
            continue;
        }

        // create a custom dialog box with textview of new episode names
        Gtk::Dialog dialog("Rename confirmation", *this);
        auto content = dialog.get_content_area();

        Gtk::TextView tx;
        content->pack_start(tx);
        tx.set_editable(false);
        dialog.add_button("_No", Gtk::RESPONSE_CANCEL);
        dialog.add_button("_Yes", Gtk::RESPONSE_OK);
        tx.show();

        auto buff = tx.get_buffer();
        buff->place_cursor(buff->begin());
        buff->insert_at_cursor(renamed_files[0].second.c_str());

        for( size_t i = 1; i < renamed_files.size(); i++ ) {
            buff->insert_at_cursor("\n");
            buff->insert_at_cursor(renamed_files[i].second.c_str());
        }

        auto response = dialog.run();

        // if user clicked "Yes" in dialog, rename files
        switch(response) {
        case Gtk::RESPONSE_OK:
            renameFiles(files[x], renamed_files);
        default:
            break;
        }
    }
}

MainWindow::MainWindow(const Glib::RefPtr<Gtk::Application> &ptr) : app(ptr) {
    set_title("TV Rename");

    set_default_size(400, 310);
    set_resizable(false);

    {
        std::ifstream file(userHome() + "/.cache/tv_rename_pattern");
        if( file ) {
            std::getline( file, default_pattern );
        } else {
            default_pattern = "%filename - %epname";
        }
    }


    add(m_layout);

    m_layout.put( m_label_show,       5,   5 );
    m_layout.put( m_label_language,   190, 5 );
    m_layout.put( m_entry_show,       5,   25 );
    m_layout.put( m_combo_language,   190, 25 );
    m_layout.put( m_label_dir,        5,   60 );
    m_layout.put( m_entry_dir,        5,   80 );
    m_layout.put( m_button_dir,       190, 80 );
    m_layout.put( m_label_pattern,    5,   115 );
    m_layout.put( m_entry_pattern,    5,   135 );
    m_layout.put( m_button_pattern,   190, 135 );
    m_layout.put( m_check_linux,      95,  169 );
    m_layout.put( m_button_process,   5,   173 );
    m_layout.put( m_check_trust,      95,  187 );
    m_layout.put( m_label_possible,   5,   210 );
    m_layout.put( m_combo_possible,   5,   230 );
    m_layout.put( m_button_get_names, 5,   265 );
    m_layout.put( m_button_quit,      315, 275 );

    // set button texts
    m_button_process.set_label( "Process" );
    m_button_get_names.set_label( "Get names" );
    m_button_quit.set_label( "Quit" );
    m_button_dir.set_label( "Choose directory" );
    m_button_pattern.set_label( "Pattern help" );
    m_check_linux.set_label( "Replace windows-illegal characters" );
    m_check_trust.set_label( "Don't ask for rename confirmation" );

    // set label texts
    m_label_show.set_label( "Show:" );
    m_label_language.set_label( "Language:" );
    m_label_possible.set_label( "Possible shows:" );
    m_label_dir.set_label( "Directory:" );
    m_label_pattern.set_label( "Pattern:" );

    // set dimensions
    m_combo_language.set_size_request( 120 );
    m_combo_possible.set_size_request( 200 );

    m_entry_show.set_size_request( 170, 30 );
    m_entry_dir.set_size_request(  170, 30 );

    m_button_dir.set_size_request(       80, 30 );
    m_button_quit.set_size_request(      80, 30 );
    m_button_process.set_size_request(   80, 30 );
    m_button_get_names.set_size_request( 80, 30 );

    // set default pattern
    m_entry_pattern.set_text(default_pattern);

    // put languages in combo box
    {
        auto model = Gtk::ListStore::create(m_columns_language);
        m_combo_language.set_model(model);
        auto row = *(model->append());
        row[m_columns_language.m_col_code] = "en";
        row[m_columns_language.m_col_language] = "English";
        m_combo_language.set_active(row);
        for(size_t i = 2; i < languages.size(); i += 2) {
            row = *(model->append());
            row[m_columns_language.m_col_code] = languages[i];
            row[m_columns_language.m_col_language] = languages[i+1];
        }
    }

    // set column to be shown in comboboxes
    m_combo_language.pack_start(m_columns_language.m_col_language);
    m_combo_possible.pack_start(m_columns_url.m_col_show);

    // set signals
    m_button_dir.signal_clicked().connect(sigc::mem_fun(*this, &MainWindow::chooseFile));
    m_button_quit.signal_clicked().connect(sigc::mem_fun(*this, &MainWindow::quit));
    m_button_process.signal_clicked().connect(sigc::mem_fun(*this, &MainWindow::process));
    m_button_get_names.signal_clicked().connect(sigc::mem_fun(*this, &MainWindow::getNames));
    m_entry_show.signal_activate().connect(sigc::mem_fun(*this, &MainWindow::process));
    m_entry_dir.signal_activate().connect(sigc::mem_fun(*this, &MainWindow::process));
    m_button_pattern.signal_clicked().connect(sigc::mem_fun(*this, &MainWindow::patternHelp));

    // show everything except possible shows and items related to them
    m_layout.show();
    m_label_show.show();
    m_label_language.show();
    m_entry_show.show();
    m_entry_dir.show();
    m_combo_language.show();
    m_button_process.show();
    m_button_quit.show();
    m_button_dir.show();
    m_check_linux.show();
    m_check_linux.set_active(true);
    m_check_trust.show();
    m_button_pattern.show();
    m_entry_pattern.show();
    m_label_pattern.show();
    m_label_dir.show();
}