from pathlib import Path
from typing import Tuple, Optional, Iterable, Dict, Sequence

from ..core import get_files
from ..core.common import mcachew
from ..kython.kompress import CPath

from .common import Event, parse_dt, Results

from my.config import github as config
import my.config.repos.ghexport.dal as ghexport


def inputs() -> Sequence[Path]:
    return get_files(config.export_dir)


def _dal():
    sources = inputs()
    sources = list(map(CPath, sources)) # TODO maybe move it to get_files? e.g. compressed=True arg?
    return ghexport.DAL(sources)


# TODO hmm. not good, need to be lazier?...
@mcachew(config.cache_dir, hashf=lambda dal: dal.sources)
def events(dal=_dal()) -> Results:
    for d in dal.events():
        yield _parse_event(d)


# TODO hmm. need some sort of abstract syntax for this...
# TODO split further, title too
def _get_summary(e) -> Tuple[str, Optional[str], Optional[str]]:
    # TODO would be nice to give access to raw event withing timeline
    eid = e['id']
    tp = e['type']
    pl = e['payload']
    rname = e['repo']['name']

    mapping = {
        'CreateEvent': 'created',
        'DeleteEvent': 'deleted',
    }

    if tp == 'ForkEvent':
        url = e['payload']['forkee']['html_url']
        return f"{rname}: forked", url, None
    elif tp == 'PushEvent':
        commits = pl['commits']
        messages = [c['message'] for c in commits]
        body = '\n'.join(messages)
        return f"{rname}: pushed\n{body}", None, None
    elif tp == 'WatchEvent':
        return f"{rname}: watching", None, None
    elif tp in mapping:
        what = mapping[tp]
        rt  = pl['ref_type']
        ref = pl['ref']
        # TODO link to branch? only contains weird API link though
        # TODO hmm. include timestamp instead?
        # breakpoint()
        # TODO combine automatically instead
        return f"{rname}: {what} {rt} {ref}", None, f'{rname}_{what}_{rt}_{ref}_{eid}'
    elif tp == 'PullRequestEvent':
        pr = pl['pull_request']
        action = pl['action']
        link = pr['html_url']
        title = pr['title']
        return f"{rname}: {action} PR {title}", link, f'{rname}_{action}_pr_{link}'
    elif tp == "IssuesEvent":
        action = pl['action']
        iss = pl['issue']
        link = iss['html_url']
        title = iss['title']
        return f"{rname}: {action} issue {title}", link, None
    elif tp == "IssueCommentEvent":
        com = pl['comment']
        link = com['html_url']
        iss = pl['issue']
        title = iss['title']
        return f"{rname}: commented on issue {title}", link, f'issue_comment_' + link
    elif tp == "ReleaseEvent":
        action = pl['action']
        rel = pl['release']
        tag = rel['tag_name']
        link = rel['html_url']
        return f"{rname}: {action} [{tag}]", link, None
    elif tp in 'PublicEvent':
        return f'{tp} {e}', None, None # TODO ???
    else:
        return tp, None, None


def _parse_event(d: Dict) -> Event:
    summary, link, eid = _get_summary(d)
    if eid is None:
        eid = d['id']
    body = d.get('payload', {}).get('comment', {}).get('body')
    return Event(
        dt=parse_dt(d['created_at']),
        summary=summary,
        link=link,
        eid=eid,
        body=body,
    )


# TODO mm. ok, not much point in deserializing as github.Event as it's basically a fancy dict wrapper?
# from github.Event import Event as GEvent # type: ignore
# # see https://github.com/PyGithub/PyGithub/blob/master/github/GithubObject.py::GithubObject.__init__
# e = GEvent(None, None, raw_event, True)