package com.myoa.engineering.crawl.ppomppu.processor.dto;

import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;

import com.myoa.engineering.crawl.ppomppu.processor.domain.PpomppuArticle;
import com.myoa.engineering.crawl.ppomppu.support.dto.BlockMessageDTO;
import com.myoa.engineering.crawl.ppomppu.support.dto.SimpleMessageDTO;
import com.myoa.engineering.crawl.ppomppu.support.dto.code.PpomppuBoardName;

/**
 * PpomppuArticleTransformer
 * @author Shin Woo-jin (woo-jin.shin@linecorp.com)
 * @since 2021-11-21
 *
 */
public final class PpomppuArticleTransformer {

    private PpomppuArticleTransformer() {}

    private static final String MESSAGE_FORMAT_V1 = "%s)) <%s|LINK> `%s` ";
    private static final String MESSAGE_FORMAT_V2 = "%s *<%s|LINK>*\n%s";
    private static final String TITLE_FORMAT_V1 = "_*:hearts: %s | %s*_";

    private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
                                                                                  .withZone(ZoneId.of("Asia/Seoul"));

    public static final Function<PpomppuArticle, SimpleMessageDTO> TRANSFORM_TO_MESSAGE_DTO = article ->
        SimpleMessageDTO.builder()
                        .requestedAt(Instant.now())
                        .publishedAt(article.getRegisteredAt())
                        .title(String.format(MESSAGE_FORMAT_V1,
                                             article.getBoardName().getMenuName(), article.getArticleUrl(),
                                             article.getTitle()))
                        .body(article.getArticleUrl())
                        .build();

    // https://stackoverflow.com/questions/24882927/using-streams-to-convert-a-list-of-objects-into-a-string-obtained-from-the-tostr
    public static SimpleMessageDTO transformToSimpleMessage(List<PpomppuArticle> articles) {
        Instant requestedAt = Instant.now();
        String body = articles.stream()
                              .map(PpomppuArticleTransformer::convertToInlineMessage)
                              .collect(Collectors.joining("\n\n"));
        return SimpleMessageDTO.builder()
                               .requestedAt(requestedAt)
                               .title(DATE_TIME_FORMATTER.format(requestedAt))
                               .body(body)
                               .build();
    }

    public static BlockMessageDTO transformToBlockMessage(PpomppuBoardName boardName, List<PpomppuArticle> articles) {
        Instant requestedAt = Instant.now();
        List<BlockMessageDTO.Block> body = articles.stream()
                                                   .map(e -> BlockMessageDTO.createBlock(convertToInlineMessage(e),
                                                                                         e.getThumbnailUrl()))
                                                   .collect(Collectors.toList());
        return BlockMessageDTO.builder()
                              .requestedAt(requestedAt)
                              .title(String.format(TITLE_FORMAT_V1,
                                                   boardName.getMenuName(),
                                                   DATE_TIME_FORMATTER.format(requestedAt)))
                              .blocks(body)
                              .build();
    }

    public static String convertToInlineMessage(PpomppuArticle article) {
        return String.format(MESSAGE_FORMAT_V2,
                             article.getBoardName().getMenuName(), article.getArticleUrl(), article.getTitle());
    }
}