import os
from typing import Optional

from flask import request, Response, send_from_directory as send_from_directory_, render_template

from .app import app
from .config import config
from ._sorters import PagesSortByTimeGroupedByFolder


def send_from_directory(path: str, file: str, alternative_path: Optional[str] = None, *args, **kwargs):
    if not os.path.exists(os.path.join(path, file)) and alternative_path:
        path = alternative_path
    return send_from_directory_(path, file, *args, **kwargs)


@app.route('/', methods=['GET'])
def home_route():
    return render_template(
        'index.html',
        pages=app.get_pages(sorter=PagesSortByTimeGroupedByFolder),
        config=config
    )


@app.route('/img/<img>', methods=['GET'])
def img_route(img: str):
    return send_from_directory(app.img_dir, img, config.default_img_dir)


@app.route('/favicon.ico', methods=['GET'])
def favicon_route():
    return img_route('favicon.ico')


@app.route('/css/<style>', methods=['GET'])
def css_route(style: str):
    return send_from_directory(app.css_dir, style, config.default_css_dir)


@app.route('/fonts/<file>', methods=['GET'])
def fonts_route(file: str):
    return send_from_directory(app.fonts_dir, file, config.default_fonts_dir)


@app.route('/article/<path:path>/<article>', methods=['GET'])
def article_with_path_route(path: str, article: str):
    return app.get_page(os.path.join(path, article))


@app.route('/article/<article>', methods=['GET'])
def article_route(article: str):
    return article_with_path_route('', article)


@app.route('/rss', methods=['GET'])
def rss_route():
    pages = app.get_pages(with_content=True, skip_header=True)
    short_description = 'short' in request.args

    return Response('''<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/">
    <channel>
        <title>{title}</title>
        <link>{link}</link>
        <description>{description}</description>
        <category>{categories}</category>
        <image>
            <url>{link}/img/icon.png</url>
            <title>{title}</title>
            <link>{link}</link>
        </image>
        <pubDate>{last_pub_date}</pubDate>
        <language>{language}</language>

        {items}
    </channel>
</rss>'''.format(
        title=config.title,
        description=config.description,
        link=config.link,
        categories=','.join(config.categories),
        language=config.language,
        last_pub_date=pages[0][1]['published'].strftime('%a, %d %b %Y %H:%M:%S GMT'),
        items='\n\n'.join([
            '''
            <item>
                <title>{title}</title>
                <link>{base_link}{link}</link>
                <pubDate>{published}</pubDate>
                <description><![CDATA[{content}]]></description>
                <media:content medium="image" url="{base_link}{image}" width="200" height="150" />
            </item>
            '''.format(
                base_link=config.link,
                title=page.get('title', '[No Title]'),
                link=page.get('uri', ''),
                published=page['published'].strftime('%a, %d %b %Y %H:%M:%S GMT') if 'published' in page else '',
                content=page.get('description', '') if short_description else page.get('content', ''),
                image=page.get('image', ''),
            )
            for _, page in pages
        ]),
    ), mimetype='application/rss+xml')


# vim:sw=4:ts=4:et: