const got = require('@/utils/got');
const showdown = require('showdown');
const { parseDate } = require('@/utils/parse-date');
const timezone = require('@/utils/timezone');
module.exports = async (ctx) => {
    const baseurl = `https://leetcode.cn`;
    const url = `${baseurl}/graphql/`;
    const headers = {
        'content-type': 'application/json',
    };
    const emoji = {
        Medium: '🟡',
        Easy: '🟢',
        Hard: '🔴',
    };
    // 获取每日一题
    const data = (
        await got({
            method: 'post',
            url,
            json: {
                operationName: 'questionOfToday',
                query: `query questionOfToday {
                            todayRecord {
                                date
                                userStatus
                                question {
                                    questionId
                                    frontendQuestionId: questionFrontendId
                                    difficulty
                                    title
                                    titleCn: translatedTitle
                                    titleSlug
                                }
                            }
                        }`,
                variables: {},
            },
            headers,
        })
    ).data.data;
    const questionTitle = data.todayRecord[0].question.titleSlug;
    const questionUrl = `${baseurl}/problems/${questionTitle}/`;

    // 获取题目内容
    const question = (
        await got({
            method: 'post',
            url,
            json: {
                operationName: 'questionData',
                query: `query questionData($titleSlug: String!) {
                            question(titleSlug: $titleSlug) {
                                questionId
                                questionFrontendId
                                categoryTitle
                                boundTopicId
                                title
                                titleSlug
                                content
                                translatedTitle
                                translatedContent
                                isPaidOnly
                                difficulty
                                likes
                            }
                        }`,
                variables: {
                    titleSlug: questionTitle,
                },
            },
            headers,
        })
    ).data.data.question;
    const diffEmoji = emoji[question.difficulty] || '';
    // 获取题解（点赞前3）
    const articles = (
        await got({
            method: 'post',
            url,
            json: {
                operationName: 'questionSolutionArticles',
                query: `query questionSolutionArticles($questionSlug: String!, $skip: Int, $first: Int, $orderBy: SolutionArticleOrderBy, $userInput: String, $tagSlugs: [String!]) {
                            questionSolutionArticles(questionSlug: $questionSlug, skip: $skip, first: $first, orderBy: $orderBy, userInput: $userInput, tagSlugs: $tagSlugs) {
                                totalNum
                                edges {
                                    node {
                                    ...solutionArticle
                                    __typename
                                    }
                                    __typename
                                }
                                __typename
                            }
                        }
                        fragment solutionArticle on SolutionArticleNode {
                            uuid
                            title
                            slug
                            createdAt
                            thumbnail
                            author {
                                username
                            }
                            summary
                        }`,
                variables: {
                    questionSlug: questionTitle,
                    first: 3,
                    skip: 0,
                    orderBy: 'MOST_UPVOTE',
                },
            },
            headers,
        })
    ).data.data.questionSolutionArticles.edges;
    // 获取题解内容
    const articleContent = (
        await Promise.all(
            articles.map((art) =>
                got({
                    method: 'post',
                    url,
                    json: {
                        operationName: 'solutionDetailArticle',
                        query: `query solutionDetailArticle($slug: String!, $orderBy: SolutionArticleOrderBy!) {
                                    solutionArticle(slug: $slug, orderBy: $orderBy) {
                                        ...solutionArticle
                                        content
                                        question {
                                            questionTitleSlug
                                            __typename
                                        }
                                    }
                                }
                                fragment solutionArticle on SolutionArticleNode {
                                    uuid
                                    title
                                    slug
                                    createdAt
                                    thumbnail
                                    author {
                                        username
                                    }
                                    summary
                                }`,
                        variables: {
                            slug: art.node.slug,
                            orderBy: 'DEFAULT',
                        },
                    },
                    headers,
                })
            )
        )
    ).map((v) => v.data.data.solutionArticle);
    const converter = new showdown.Converter();
    const handleText = (s) => {
        // 处理多语言代码展示问题
        s = s.replace(/(```)([a-zA-Z0-9-+#]+)\s*?(\[.*?\])?\n/g, '\r\n###$2\r\n$1$2\r\n');
        return s;
    };
    ctx.state.data = {
        title: 'LeetCode 每日一题题解',
        description: 'LeetCode 每日一题题解',
        link: questionUrl,
        item: [
            {
                title: `每日一题-${question.translatedTitle}${diffEmoji}`,
                link: questionUrl,
                description: question.translatedContent,
                pubDate: timezone(parseDate(data.todayRecord[0].date), +8),
            },
            ...articleContent.map((art, i) => ({
                title: art.title,
                link: `${questionUrl}/solution/${art.slug}`,
                description: converter.makeHtml(handleText(art.content)),
                pubDate: timezone(parseDate(articles[i].node.createdAt), +8),
                author: art.author.username,
            })),
        ],
    };
};