"""
Feedly RSS reader
"""

import json
from abc import abstractmethod
from datetime import datetime, timezone
from pathlib import Path
from typing import Iterator, Protocol, Sequence

from my.core import Paths, get_files

from .common import Subscription, SubscriptionState


class config(Protocol):
    @property
    @abstractmethod
    def export_path(self) -> Paths:
        raise NotImplementedError


def make_config() -> config:
    from my.config import feedly as user_config

    class combined_config(user_config, config): ...

    return combined_config()


def inputs() -> Sequence[Path]:
    cfg = make_config()
    return get_files(cfg.export_path)


def parse_file(f: Path) -> Iterator[Subscription]:
    raw = json.loads(f.read_text())
    for r in raw:
        # err, some even don't have website..
        rid = r['id']
        website = r.get('website', rid)  # meh
        yield Subscription(
            created_at=None,
            title=r['title'],
            url=website,
            id=rid,
        )


def states() -> Iterator[SubscriptionState]:
    for f in inputs():
        dts = f.stem.split('_')[-1]
        dt = datetime.strptime(dts, '%Y%m%d%H%M%S').replace(tzinfo=timezone.utc)
        subs = list(parse_file(f))
        yield dt, subs