package org.telegram.updateshandlers;

import lombok.extern.slf4j.Slf4j;
import org.telegram.BotConfig;
import org.telegram.Commands;
import org.telegram.database.DatabaseManager;
import org.telegram.services.Emoji;
import org.telegram.services.LocalisationService;
import org.telegram.telegrambots.bots.TelegramLongPollingBot;
import org.telegram.telegrambots.meta.api.methods.send.SendDocument;
import org.telegram.telegrambots.meta.api.methods.send.SendMessage;
import org.telegram.telegrambots.meta.api.objects.InputFile;
import org.telegram.telegrambots.meta.api.objects.Message;
import org.telegram.telegrambots.meta.api.objects.Update;
import org.telegram.telegrambots.meta.api.objects.replykeyboard.ReplyKeyboardMarkup;
import org.telegram.telegrambots.meta.api.objects.replykeyboard.ReplyKeyboardRemove;
import org.telegram.telegrambots.meta.api.objects.replykeyboard.buttons.KeyboardRow;
import org.telegram.telegrambots.meta.exceptions.TelegramApiException;
import org.telegram.telegrambots.meta.exceptions.TelegramApiRequestException;

import java.io.InvalidObjectException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * @author Ruben Bermudez
 * @version 1.0
 * Handler for updates to Files Bot
 * This bot is an example for the use of sendMessage asynchronously
 */
@Slf4j
public class FilesHandlers extends TelegramLongPollingBot {

    private static final int INITIAL_UPLOAD_STATUS = 0;
    private static final int DELETE_UPLOADED_STATUS = 1;
    private final ConcurrentLinkedQueue<Integer> languageMessages = new ConcurrentLinkedQueue<>();

    @Override
    public String getBotToken() {
        return BotConfig.FILES_TOKEN;
    }

    @Override
    public void onUpdateReceived(Update update) {
        try {
            if (update.hasMessage()) {
                try {
                    SendMessage sendMessageRequest = new SendMessage();
                    sendMessageRequest.setText("Since this bot was used to spread copyrighted content, we had to disable its functionality until further announcement.\n\nSorry for the troubles, just blame those that used the bot for illegal purposes.");
                    sendMessageRequest.setChatId(Long.toString(update.getMessage().getChatId()));
                    execute(sendMessageRequest);

                    //handleFileUpdate(update);
                } catch (TelegramApiRequestException e) {
                    if (e.getApiResponse().contains("Bot was blocked by the user")) {
                        if (update.getMessage().getFrom() != null) {
                            DatabaseManager.getInstance().deleteUserForFile(update.getMessage().getFrom().getId());
                        }
                    }
                } catch (Exception e) {
                    log.error(e.getLocalizedMessage(), e);
                }
            }
        } catch (Exception e) {
            log.error(e.getLocalizedMessage(), e);
        }
    }

    @Override
    public String getBotUsername() {
        return BotConfig.FILES_USER;
    }

    private void handleFileUpdate(Update update) throws InvalidObjectException, TelegramApiException {
        Message message = update.getMessage();
        if (message != null && message.hasText()) {
            if (languageMessages.contains(message.getFrom().getId())) {
                onLanguageReceived(message);
            } else {
                String language = DatabaseManager.getInstance().getUserLanguage(update.getMessage().getFrom().getId());
                if (message.getText().startsWith(Commands.setLanguageCommand)) {
                    onSetLanguageCommand(message, language);
                } else {
                    String[] parts = message.getText().split(" ", 2);
                    if (parts[0].startsWith(Commands.startCommand)) {
                        if (parts.length == 2) {
                            onStartWithParameters(message, language, parts[1]);
                        } else {
                            sendHelpMessage(message, language);
                        }
                    } else if (!message.isGroupMessage()) {
                        if (parts[0].startsWith(Commands.uploadCommand)) { // Open upload for user
                            onUploadCommand(message, language);
                        } else if (parts[0].startsWith(Commands.cancelCommand)) {
                            onCancelCommand(message, language);
                        } else if (parts[0].startsWith(Commands.deleteCommand)) {
                            onDeleteCommand(message, language, parts);
                        } else if (parts[0].startsWith(Commands.listCommand)) {
                            onListCommand(message, language);
                        } else {
                            sendHelpMessage(message, language);
                        }
                    }
                }
            }
        } else if (message != null && message.hasDocument()
                && DatabaseManager.getInstance().getUserStatusForFile(message.getFrom().getId()) == INITIAL_UPLOAD_STATUS) {
            String language = DatabaseManager.getInstance().getUserLanguage(update.getMessage().getFrom().getId());
            DatabaseManager.getInstance().addFile(message.getDocument().getFileId(), message.getFrom().getId(), message.getDocument().getFileName());
            SendMessage sendMessageRequest = new SendMessage();
            sendMessageRequest.setText(LocalisationService.getString("fileUploaded", language) +
                    LocalisationService.getString("uploadedFileURL", language) + message.getDocument().getFileId());
            sendMessageRequest.setChatId(Long.toString(message.getChatId()));
            execute(sendMessageRequest);
        }
    }

    private void onListCommand(Message message, String language) throws InvalidObjectException, TelegramApiException {
        HashMap<String, String> files = DatabaseManager.getInstance().getFilesByUser(message.getFrom().getId());
        SendMessage sendMessageRequest = new SendMessage();
        if (files.size() > 0) {
            String text = LocalisationService.getString("listOfFiles", language) + ":\n\n";
            for (Map.Entry<String, String> entry : files.entrySet()) {
                text += LocalisationService.getString("uploadedFileURL", language)
                        + entry.getKey() + " " + Emoji.LEFT_RIGHT_ARROW.toString() + " " + entry.getValue() + "\n";
            }
            sendMessageRequest.setText(text);
        } else {
            sendMessageRequest.setText(LocalisationService.getString("noFiles", language));
        }
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));
        sendMessageRequest.setReplyMarkup(new ReplyKeyboardRemove());
        execute(sendMessageRequest);
    }

    private void onDeleteCommand(Message message, String language, String[] parts) throws InvalidObjectException, TelegramApiException {
        if (DatabaseManager.getInstance().getUserStatusForFile(message.getFrom().getId()) == DELETE_UPLOADED_STATUS &&
                parts.length == 2) {
            onDeleteCommandWithParameters(message, language, parts[1]);
        } else {
            onDeleteCommandWithoutParameters(message, language);
        }
    }

    private void onDeleteCommandWithoutParameters(Message message, String language) throws InvalidObjectException, TelegramApiException {
        DatabaseManager.getInstance().addUserForFile(message.getFrom().getId(), DELETE_UPLOADED_STATUS);
        SendMessage sendMessageRequest = new SendMessage();
        sendMessageRequest.setText(LocalisationService.getString("deleteUploadedFile", language));
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));
        HashMap<String, String> files = DatabaseManager.getInstance().getFilesByUser(message.getFrom().getId());
        ReplyKeyboardMarkup replyKeyboardMarkup = new ReplyKeyboardMarkup();
        if (files.size() > 0) {
            List<KeyboardRow> commands = new ArrayList<>();
            for (Map.Entry<String, String> entry : files.entrySet()) {
                KeyboardRow commandRow = new KeyboardRow();
                commandRow.add(Commands.deleteCommand + " " + entry.getKey() + " " + Emoji.LEFT_RIGHT_ARROW.toString()
                        + " " + entry.getValue());
                commands.add(commandRow);
            }
            replyKeyboardMarkup.setResizeKeyboard(true);
            replyKeyboardMarkup.setOneTimeKeyboard(true);
            replyKeyboardMarkup.setKeyboard(commands);
        }
        sendMessageRequest.setReplyMarkup(replyKeyboardMarkup);
        execute(sendMessageRequest);
    }

    private void onDeleteCommandWithParameters(Message message, String language, String part) throws InvalidObjectException, TelegramApiException {
        String[] innerParts = part.split(Emoji.LEFT_RIGHT_ARROW.toString(), 2);
        boolean removed = DatabaseManager.getInstance().deleteFile(innerParts[0].trim());
        SendMessage sendMessageRequest = new SendMessage();
        if (removed) {
            sendMessageRequest.setText(LocalisationService.getString("fileDeleted", language));
        } else {
            sendMessageRequest.setText(LocalisationService.getString("wrongFileId", language));
        }
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));

        execute(sendMessageRequest);
        DatabaseManager.getInstance().deleteUserForFile(message.getFrom().getId());

    }

    private void onCancelCommand(Message message, String language) throws InvalidObjectException, TelegramApiException {
        DatabaseManager.getInstance().deleteUserForFile(message.getFrom().getId());
        SendMessage sendMessageRequest = new SendMessage();
        sendMessageRequest.setText(LocalisationService.getString("processFinished", language));
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));
        execute(sendMessageRequest);
    }

    private void onUploadCommand(Message message, String language) throws InvalidObjectException, TelegramApiException {
        DatabaseManager.getInstance().addUserForFile(message.getFrom().getId(), INITIAL_UPLOAD_STATUS);
        SendMessage sendMessageRequest = new SendMessage();
        sendMessageRequest.setText(LocalisationService.getString("sendFileToUpload", language));
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));
        execute(sendMessageRequest);
    }

    private void sendHelpMessage(Message message, String language) throws InvalidObjectException, TelegramApiException {
        SendMessage sendMessageRequest = new SendMessage();
        String formatedString = String.format(
                LocalisationService.getString("helpFiles", language),
                Commands.startCommand, Commands.uploadCommand, Commands.deleteCommand,
                Commands.listCommand);
        sendMessageRequest.setText(formatedString);
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));
        execute(sendMessageRequest);
    }

    private void onStartWithParameters(Message message, String language, String part) throws InvalidObjectException, TelegramApiException {
        if (DatabaseManager.getInstance().doesFileExists(part.trim())) {
            SendDocument sendDocumentRequest = new SendDocument();
            sendDocumentRequest.setDocument(new InputFile(part.trim()));
            sendDocumentRequest.setChatId(Long.toString(message.getChatId()));
            execute(sendDocumentRequest);
        } else {
            SendMessage sendMessageRequest = new SendMessage();
            sendMessageRequest.setText(LocalisationService.getString("wrongFileId", language));
            sendMessageRequest.setChatId(Long.toString(message.getChatId()));
            execute(sendMessageRequest);
        }
    }

    private void onSetLanguageCommand(Message message, String language) throws InvalidObjectException, TelegramApiException {
        SendMessage sendMessageRequest = new SendMessage();
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));
        ReplyKeyboardMarkup replyKeyboardMarkup = new ReplyKeyboardMarkup();
        List<LocalisationService.Language> languages = LocalisationService.getSupportedLanguages();
        List<KeyboardRow> commands = new ArrayList<>();
        for (LocalisationService.Language languageItem : languages) {
            KeyboardRow commandRow = new KeyboardRow();
            commandRow.add(languageItem.getCode() + " " + Emoji.LEFT_RIGHT_ARROW.toString() + " " + languageItem.getName());
            commands.add(commandRow);
        }
        replyKeyboardMarkup.setResizeKeyboard(true);
        replyKeyboardMarkup.setOneTimeKeyboard(true);
        replyKeyboardMarkup.setKeyboard(commands);
        replyKeyboardMarkup.setSelective(true);
        sendMessageRequest.setReplyMarkup(replyKeyboardMarkup);
        sendMessageRequest.setText(LocalisationService.getString("chooselanguage", language));
        execute(sendMessageRequest);
        languageMessages.add(message.getFrom().getId());
    }

    private void onLanguageReceived(Message message) throws InvalidObjectException, TelegramApiException {
        String[] parts = message.getText().split(Emoji.LEFT_RIGHT_ARROW.toString(), 2);
        SendMessage sendMessageRequest = new SendMessage();
        sendMessageRequest.setChatId(Long.toString(message.getChatId()));
        if (LocalisationService.getLanguageByCode(parts[0].trim()) != null) {
            DatabaseManager.getInstance().putUserLanguage(message.getFrom().getId(), parts[0].trim());
            sendMessageRequest.setText(LocalisationService.getString("languageModified", parts[0].trim()));
        } else {
            sendMessageRequest.setText(LocalisationService.getString("errorLanguage"));
        }
        sendMessageRequest.setReplyToMessageId(message.getMessageId());
        ReplyKeyboardRemove replyKeyboardRemove = new ReplyKeyboardRemove();
        replyKeyboardRemove.setSelective(true);
        sendMessageRequest.setReplyMarkup(replyKeyboardRemove);
        execute(sendMessageRequest);
        languageMessages.remove(message.getFrom().getId());
    }
}