import { Data, DataItem, Route } from '@/types';
import cache from '@/utils/cache';
import ofetch from '@/utils/ofetch';
import { load } from 'cheerio';
import { parseDate } from '@/utils/parse-date';
import timezone from '@/utils/timezone';
import InvalidParameterError from '@/errors/types/invalid-parameter';
import type { Context } from 'hono';

const baseUrl = 'https://gr.uestc.edu.cn/';
const detailUrl = 'https://gr.uestc.edu.cn/';

const dateTimeRegex = /(\d{4}-\d{2}-\d{2} \d{2}:\d{2})/;

const typeUrlMap = {
    important: 'tongzhi/',
    teaching: 'tongzhi/119',
    degree: 'tongzhi/129',
    student: 'tongzhi/122',
    practice: 'tongzhi/123',
};

const typeNameMap = {
    important: '重要公告',
    teaching: '教学管理',
    degree: '学位管理',
    student: '学生管理',
    practice: '就业实践',
};

export const route: Route = {
    path: '/gr/:type?',
    categories: ['university'],
    example: '/uestc/gr/student',
    parameters: { type: '默认为 `important`' },
    features: {
        requireConfig: false,
        requirePuppeteer: false,
        antiCrawler: true,
        supportBT: false,
        supportPodcast: false,
        supportScihub: false,
    },
    radar: [
        {
            source: ['gr.uestc.edu.cn/'],
        },
    ],
    name: '研究生院',
    maintainers: ['huyyi', 'mobyw'],
    handler,
    url: 'gr.uestc.edu.cn/',
    description: `\
| 重要公告  | 教学管理 | 学位管理 | 学生管理 | 就业实践 |
| --------- | -------- | -------- | -------- | -------- |
| important | teaching | degree   | student  | practice |`,
};

async function handler(ctx: Context): Promise<Data> {
    const type = ctx.req.param('type') || 'important';
    if (type in typeUrlMap === false) {
        throw new InvalidParameterError('type not supported');
    }
    const typeName = typeNameMap[type];

    const indexContent = await ofetch(baseUrl + typeUrlMap[type]);

    const $ = load(indexContent);
    const entries = $('div.title').toArray();

    const items = entries.map(async (entry) => {
        const element = $(entry);
        const newsTitle = element.find('a').text() ?? '';
        const newsLink = detailUrl + element.find('a').attr('href');

        const newsDetail = await cache.tryGet(newsLink, async () => {
            const newsContent = await ofetch(newsLink);
            const content = load(newsContent);

            const basicInfo = content('div.topic_detail_header').find('div.info').text();
            const match = dateTimeRegex.exec(basicInfo);

            return {
                title: newsTitle,
                link: newsLink,
                pubDate: match ? timezone(parseDate(match[1]), +8) : null,
                description: content('div.content').html(),
            };
        });

        return newsDetail;
    });

    const out = await Promise.all(items);

    return {
        title: `研究生院通知（${typeName}）`,
        link: baseUrl,
        description: `电子科技大学研究生院通知（${typeName}）`,
        item: out as DataItem[],
    };
}