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package com.pengrad.telegrambot.impl;

import com.pengrad.telegrambot.*;
import com.pengrad.telegrambot.model.Update;
import com.pengrad.telegrambot.request.GetUpdates;
import com.pengrad.telegrambot.response.GetUpdatesResponse;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import static com.pengrad.telegrambot.UpdatesListener.CONFIRMED_UPDATES_ALL;
import static com.pengrad.telegrambot.UpdatesListener.CONFIRMED_UPDATES_NONE;

/**
 * Stas Parshin
 * 29 September 2016
 */
public class UpdatesHandler {

    private TelegramBot bot;
    private UpdatesListener listener;
    private ExceptionHandler exceptionHandler;
    private Cancellable pendingRequest;

    private final long sleepTimeout;

    public UpdatesHandler(long sleepTimeout) {
        this.sleepTimeout = sleepTimeout;
    }

    public void start(TelegramBot bot, UpdatesListener listener, ExceptionHandler exceptionHandler, GetUpdates request) {
        this.bot = bot;
        this.listener = listener;
        this.exceptionHandler = exceptionHandler;
        getUpdates(request);
    }

    public void stop() {
        bot = null;
        listener = null;
        exceptionHandler = null;
        if (pendingRequest != null) {
            pendingRequest.cancel();
            pendingRequest = null;
        }
    }

    private void getUpdates(GetUpdates request) {
        if (bot == null || listener == null) return;

        pendingRequest = bot.execute(request, new Callback() {
            @Override
            public void onResponse(GetUpdates request, GetUpdatesResponse response) {
                if (listener == null) return;

                if (!response.isOk() || response.updates() == null || response.updates().size() <= 0) {
                    if (!response.isOk()) {
                        if (exceptionHandler != null) {
                            String message = "GetUpdates failed with error_code " +
                                    response.errorCode() + " " + response.description();
                            exceptionHandler.onException(new TelegramException(message, response));
                        } else {
                            Logger.getGlobal().log(Level.INFO,
                                    "Update listener error for request " + request.toWebhookResponse() +
                                            " with response " + response.errorCode() + " " + response.description());
                        }
                    }
                    sleep();
                    getUpdates(request);
                    return;
                }

                List updates = response.updates();
                if (updates == null) updates = Collections.emptyList();
                int lastConfirmedUpdate = listener.process(updates);

                if (lastConfirmedUpdate != CONFIRMED_UPDATES_NONE) {
                    int offset = lastConfirmedUpdate == CONFIRMED_UPDATES_ALL
                            ? lastUpdateId(updates) + 1
                            : lastConfirmedUpdate + 1;
                    request = request.offset(offset);
                }
                getUpdates(request);
            }

            @Override
            public void onFailure(GetUpdates request, IOException e) {
                // TODO: better way to identify canceled request
                if (e.getMessage().equals("Canceled")) {
                    return;
                }
                if (exceptionHandler != null) {
                    exceptionHandler.onException(new TelegramException(e));
                } else {
                    Logger.getGlobal().log(Level.INFO, "Update listener failure", e);
                }
                sleep();
                getUpdates(request);
            }
        });
    }

    private int lastUpdateId(List updates) {
        return updates.get(updates.size() - 1).updateId();
    }

    private void sleep() {
        if (sleepTimeout <= 0L) return;
        try {
            Thread.sleep(sleepTimeout);
        } catch (InterruptedException ignored) {
        }
    }
}