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


def fetch_issues_with_spent_time(from_date: str, to_date: str) -> Optional[List[Tuple[Issue, float]]]:
    """
    Fetch unique issues linked to time entries of the current user in given date range,
    along with total spent hours per issue.
    Returns list of (issue, total_hours) tuples.
    """

    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
    )

    # Агрегируем часы по issue.id
    spent_time: Dict[int, float] = {}
    issue_ids = set()
    for entry in time_entries:
        if hasattr(entry, 'issue') and entry.issue and hasattr(entry, 'hours'):
            iid = entry.issue.id
            issue_ids.add(iid)
            spent_time[iid] = spent_time.get(iid, 0.0) + float(entry.hours)

    if not issue_ids:
        return None

    # Загружаем полные объекты задач
    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'
    )

    # Сопоставляем задачи с суммарным временем
    result = []
    for issue in issues:
        total_hours = spent_time.get(issue.id, 0.0)
        result.append((issue, total_hours))

    # Сортируем по проекту (Redmine API уже сортирует, но для надёжности)
    result.sort(key=lambda x: str(x[0].project))
    return result