from typing import List, Optional, Set
from redminelib import Redmine
from redminelib.resources import Issue
from .config import Config


def fetch_issues_by_time_entries(from_date: str, to_date: str) -> Optional[List[Issue]]:
    """
    Fetch unique issues linked to time entries of the current user in given date range.
    """

    redmine = Redmine(
        Config.REDMINE_URL,
        username=Config.REDMINE_USER,
        password=Config.REDMINE_PASSWORD,
        requests={'verify': '/etc/ssl/certs/ca-certificates.crt'}
    )

    current_user = redmine.user.get('current')
    time_entries = redmine.time_entry.filter(
        user_id=current_user.id,
        from_date=from_date,
        to_date=to_date
    )

    issue_ids: Set[int] = set()
    for entry in time_entries:
        if hasattr(entry, 'issue') and entry.issue:
            issue_ids.add(entry.issue.id)

    if not issue_ids:
        return None

    # Fetch full issue objects with project/version/status
    issue_list_str = ','.join(str(i) for i in issue_ids)
    issues = redmine.issue.filter(
        issue_id=issue_list_str,
        status_id='*',
        sort='project:asc'
    )

    return list(issues)