import hashlib
import re
from pathlib import Path
import logging

logger = logging.getLogger()


def get_fname(url):
    m = hashlib.md5()
    m.update(url.encode('utf8'))
    return m.hexdigest()


class Store:
    def __init__(self, basedir: Path = None):
        if basedir is None:
            basedir = Path('~/.local/share/marxbook/bookmarks/').expanduser()
        self.basedir = basedir
        self.serializer = Serializer()

    def add(self, url: str, title=None, tag=[], description=''):
        dest = self.basedir
        dest.mkdir(parents=True, exist_ok=True)
        fname = get_fname(url)
        fpath = dest / fname
        content = self.serializer.encode(dict(
            url=url, title=title, tags=tag, description=description))
        with fpath.open('w') as buf:
            buf.write(content)

    def get(self, path: str):
        fpath = self.basedir / path
        with fpath.open() as buf:
            return self.serializer.decode(buf.read())

    def __iter__(self):
        for urlfile in self.basedir.glob('**/*'):
            if not urlfile.is_file():
                continue
            data = self.get(urlfile)
            ret = { 'Path': str(urlfile.relative_to(self.basedir)) }
            ret.update(data)
            yield ret

    def folder(self, folder: str):
        return Store(self.basedir / folder)


HEADER_LINE = re.compile(r'^([^:]+): (.*)$')


class Serializer:
    def __init__(self):
        pass

    def encode(self, data: dict) -> str:
        m = ''
        tags = data.pop('tags', [])  # those are special!
        for key in data:
            m += '%s: %s\n' % (key.title(), str(data[key]).replace('\n', ' '))
        for tag in tags:
            m += '%s: %s\n' % ('Tag', tag)
        return m

    def decode(self, content: str) -> dict:
        d: dict = {'Tag': []}
        for num, line in enumerate(content.split('\n'), 1):
            if not line.strip():
                continue
            m = HEADER_LINE.match(line)
            if m is None:
                logger.error("Invalid line %d" % num)
                continue
            key, value = m.groups()
            key = key.title()
            if key == 'Tag':
                d[key].append(value)
            else:
                d[key] = value
        return d


if __name__ == '__main__':
    import sys
    s = Store()
    # print(s.get(sys.argv[1]))
    for line in s.list(sys.argv[1]):
        print(line)