import markdown
import pathlib
import os

current_dir = pathlib.Path(__file__).parent

with (current_dir / "base_feed.xml").open("r") as f:
    base_feed = f.read()

with (current_dir / "base_item.xml").open("r") as f:
    base_item = f.read()

def convert_case(string: str):
    while string.find("_") != -1:
        string = string.replace("_" + string[string.index("_") + 1], string[string.index("_") +1].upper())

    return string

def article_to_xml(article_path: pathlib.Path):
    with (article_path / "article.md").open("r") as f:
        markdown_data = f.read()

    markdown_instance = markdown.Markdown(extensions=['meta', 'nl2br'])
    html = markdown_instance.convert(markdown_data)
    metadata = markdown_instance.Meta
    tags = [f"<{convert_case(key)}>{metadata[key][0]}</{convert_case(key)}>" for key in metadata.keys()]
    tags.append(f"<description>\n{html}\n</description>")
    return base_item.format(tags="\n".join(tags))

def make_rss_feed(path, channel_name, channel_link, description):
    articles = "".join([article_to_xml(path) for path in (pathlib.Path.cwd() / path).glob("*")])
    return base_feed \
            .replace("{title}", channel_name)       \
            .replace("{link}", channel_link)        \
            .replace("{description}", description)  \
            .replace("{items}", articles)