import re
import logging
import itertools

from revision import Revision


class History:
    """Store the history of revisions of a package in different
    projects.

    """

    def __init__(self, obs, package):
        self.obs = obs
        self.package = package

        self.revisions = {}

    def __contains__(self, project):
        return project in self.revisions

    def __getitem__(self, project):
        return self.revisions[project]

    def _extract_copypac(self, comment):
        original_project = re.findall(
            r"osc copypac from project:(.*) package:", comment
        )
        return original_project[0] if original_project else None

    def _fetch_revisions(self, project, **params):
        root = self.obs._history(project, self.package, **params)
        if root is not None:
            return [
                Revision(self.obs, self, project, self.package).parse(r)
                for r in root.findall("revision")
            ]

    def fetch_revisions(self, project, follow_copypac=False):
        """Get the revision history of a package"""
        if project in self:
            return

        revs = self._fetch_revisions(project)
        self.revisions[project] = revs
        # while (
        #     revs
        #     and follow_copypac
        #     and (copypac_project := self._extract_copypac(revs[0].comment))
        # ):
        #     # Add the history pre-copypac
        #     # TODO: missing the old project name
        #     revs = self._fetch_revisions(copypac_project, deleted=1)
        #     self.revisions[project] = (
        #         revs + self.revisions[project]
        #     )

    def fetch_all_revisions(self, projects):
        """Pre-populate the history"""
        for project, _, api_url in projects:
            self.obs.change_url(api_url)
            self.fetch_revisions(project)

    def sort_all_revisions(self):
        """Sort revisions for all projects, from older to newer"""
        return sorted(itertools.chain(*self.revisions.values()), key=lambda x: x.time)

    def find_revision(self, project, revisionid, accepted_at):
        last_commited_revision = None
        for r in self.revisions.get(project, []):
            logging.debug(f"Find revision {revisionid} [{accepted_at}]: {r}")
            if str(r.rev) == str(revisionid) or r.srcmd5 == revisionid:
                if r.ignored:
                    logging.debug(
                        f"{r} fits but is ignored, returning {last_commited_revision}"
                    )
                    return last_commited_revision
                else:
                    logging.debug(f"{r} fits")
                    return r
            if r.time > accepted_at:
                # if we can't find the right revision, we take the last
                # commit. Before ~2012 the data was tracked really loosely
                # (e.g. using different timezones and the state field was
                # only introduced in 2016...)
                logging.warning(
                    f"Deploying workaround for missing request revision - returning {last_commited_revision}"
                )
                return last_commited_revision
            if r.commit:
                last_commited_revision = r
        logging.info("No commited revision found, returning None")
        return None

    def find_last_rev_after_time(self, project, time):
        # revs = self.projects.get(project, [])
        # return next((r for r in reversed(revs) if r.time <= time), None)
        prev = None
        for rev in self.revisions.get(project, []):
            if rev.time > time:
                return prev
            if rev.time == time:
                return rev
            prev = rev
        return prev