package ru.ulstu.grant.service;

import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.DomNode;
import com.gargoylesoftware.htmlunit.html.HtmlPage;
import org.springframework.stereotype.Service;
import ru.ulstu.configuration.ApplicationProperties;
import ru.ulstu.grant.model.GrantDto;
import ru.ulstu.grant.page.KiasPage;
import ru.ulstu.user.service.UserService;

import java.io.IOException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.List;

@Service
public class KiasService {
    private final static String BASE_URL = "https://www.rfbr.ru/rffi/ru/contest_search?CONTEST_STATUS_ID=%s&CONTEST_TYPE=%s&CONTEST_YEAR=%s";
    private final static String CONTEST_STATUS_ID = "1";
    private final static String CONTEST_TYPE = "-1";

    private final UserService userService;
    private final ApplicationProperties applicationProperties;

    public KiasService(UserService userService,
                       ApplicationProperties applicationProperties) {
        this.userService = userService;
        this.applicationProperties = applicationProperties;
    }

    public List<GrantDto> getNewGrantsDto() throws ParseException, IOException {
        Integer leaderId = userService.findOneByLoginIgnoreCase("admin").getId();
        List<GrantDto> grants = new ArrayList<>();
        try (final WebClient webClient = new WebClient()) {
            for (Integer year : generateGrantYears()) {
                final HtmlPage page = webClient.getPage(String.format(BASE_URL, CONTEST_STATUS_ID, CONTEST_TYPE, year));
                grants.addAll(getKiasGrants(page));
            }
        }
        grants.forEach(grantDto -> grantDto.setLeaderId(leaderId));
        return grants;
    }

    public List<GrantDto> getKiasGrants(HtmlPage page) throws ParseException {
        List<GrantDto> newGrants = new ArrayList<>();
        KiasPage kiasPage = new KiasPage(page);
        do {
            newGrants.addAll(getGrantsFromPage(kiasPage));
        } while (kiasPage.goToNextPage()); //проверка существования следующей страницы с грантами
        return newGrants;
    }

    private List<GrantDto> getGrantsFromPage(KiasPage kiasPage) throws ParseException {
        List<GrantDto> grants = new ArrayList<>();
        for (DomNode grantElement : kiasPage.getPageOfGrants()) {
            if (kiasPage.isTableRowGrantLine(grantElement)) {
                GrantDto grantDto = new GrantDto(
                        kiasPage.getGrantTitle(grantElement),
                        kiasPage.parseDeadLineDate(grantElement));
                grants.add(grantDto);
            }
        }
        return grants;
    }

    private List<Integer> generateGrantYears() {
        return Arrays.asList(Calendar.getInstance().get(Calendar.YEAR),
                Calendar.getInstance().get(Calendar.YEAR) + 1);
    }
}