const got = require('@/utils/got');
const config = require('@/config').value;

module.exports = async (ctx) => {
    const { user, repo, order, anon } = ctx.params;

    const host = `https://github.com/${user}/${repo}`;
    const url = `https://api.github.com/repos/${user}/${repo}/contributors?` + (anon ? 'anon=1' : '');

    // Use token if available
    const headers = {};
    if (config.github && config.github.access_token) {
        headers.Authorization = `token ${config.github.access_token}`;
    }

    // First page
    const response = await got({
        method: 'get',
        url,
        headers,
    });
    let data = response.data;

    try {
        // Get total page number
        const last_page_link = response.headers.link.split(',').find((elem) => elem.includes('"last"'));
        const url_base = last_page_link.match(/<(.*)page=\d*/)[1];
        const page_count = Number(last_page_link.match(/page=(\d*)/)[1]);

        const generate_array = (n) => [...Array(n - 1)].map((_, index) => index + 2);
        const page_array = generate_array(page_count);

        // Get everypage
        const tasks = page_array.map(async (page) => {
            const response = await got({
                method: 'get',
                url: `${url_base}page=${page}`,
                headers,
            });
            data = data.concat(response.data);
        });
        await Promise.all(tasks);
    } catch (err) {
        // If only one page

        // Other errors
        if (!(err instanceof TypeError)) {
            throw err;
        }
    }

    // Sort by commits
    data.sort((a, b) => a.contributions - b.contributions);
    if (order !== 'asc') {
        data.reverse();
    }

    let title, description, link, guid;

    const items = [];
    let index = 0;

    // Generate RSS
    data.forEach((item) => {
        const time = new Date();
        time.setMinutes(time.getMinutes() - index);
        index++;

        // Distiguished between acounts
        if (item.type === 'Anonymous') {
            title = `Contributor: ${item.name}`;
            description = `<p>Anonymous contributor</p><p>Name: ${item.name}</p><p>E-mail: ${item.email}</p><p>Contributions: ${item.contributions}</p>`;
            link = '';
            guid = `anon-${item.name}`;
        } else {
            title = `Contributor: ${item.login}`;
            description = `<img src="${item.avatar_url}"></img><p><a href="${item.html_url}">${item.login}</a></p><p>Contributions: ${item.contributions}</p>`;
            link = item.html_url;
            guid = item.id;
        }

        items.push({
            title,
            description,
            guid,
            link,
            pubDate: time,
        });
    }),
        (ctx.state.data = {
            title: `${user}/${repo} Contributors`,
            link: `${host}/graphs/contributors`,
            description: `New contributors for ${user}/${repo}`,
            item: items,
        });
};