"""
===============================================================================
FILE: services/tasks/service.py
PROJECT: SCUD Orion AI (Unified Architecture)
MODULE: services / tasks
ROLE: Единый доменный сервис задач (бизнес-логика и диспетчер операций).

AI-CONTEXT-ANCHORS:
  - ANCHOR[TASK_SERVICE_DISPATCHER]: Маршрутизация действий ADD/UPDATE/DELETE/EXPORT.
===============================================================================
"""

from typing import Dict, Any, Optional, List
from .repository import repo_get_tasks, repo_add_task, repo_update_task, repo_delete_task
from .exporter import export_tasks_to_markdown


def get_tasks(user_id: int, status: Optional[str] = None) -> List[Dict[str, Any]]:
    """Получить список задач."""
    return repo_get_tasks(user_id, status)


def add_task(user_id: int, module: str, title: str, priority: str = "MEDIUM", due_date: Optional[str] = None, status: str = "BACKLOG") -> Dict[str, Any]:
    """Создать задачу."""
    res = repo_add_task(user_id, module, title, priority, due_date, status)
    return {"status": "success", "task_id": res["task_id"], "message": f"Задача #{res['id']} создана и добавлена в планы"}


def update_task_details(user_id: int, task_id: str, title: Optional[str] = None, priority: Optional[str] = None, status: Optional[str] = None, due_date: Optional[str] = None) -> Dict[str, Any]:
    """Обновить задачу."""
    return repo_update_task(user_id, task_id, title, priority, status, due_date)


def delete_task(user_id: int, task_id: str) -> Dict[str, Any]:
    """Удалить задачу."""
    return repo_delete_task(user_id, task_id)


# ANCHOR[TASK_SERVICE_DISPATCHER]
def execute_task_action(
    user_id: int,
    action: str,
    task_id: Optional[str] = None,
    title: Optional[str] = None,
    priority: Optional[str] = "MEDIUM",
    status: Optional[str] = None,
    module: Optional[str] = "general",
    due_date: Optional[str] = None,
    filename: Optional[str] = "ROADMAP.md"
) -> Dict[str, Any]:
    """Консолидированный диспетчер операций над задачами."""
    act = (action or "").strip().upper()
    
    if act == "ADD":
        if not title:
            return {"status": "error", "message": "Для создания задачи требуется указать title"}
        return add_task(user_id, module or "general", title, priority or "MEDIUM", due_date, status or "BACKLOG")
        
    elif act == "UPDATE":
        if not task_id:
            return {"status": "error", "message": "Для обновления требуется указать task_id"}
        return update_task_details(user_id, str(task_id), title, priority, status, due_date)
        
    elif act == "DELETE":
        if not task_id:
            return {"status": "error", "message": "Для удаления требуется указать task_id"}
        return delete_task(user_id, str(task_id))
        
    elif act == "EXPORT":
        return export_tasks_to_markdown(user_id, filename=filename or "ROADMAP.md", status_filter=status)
        
    return {"status": "error", "message": f"Неизвестное действие action='{action}'"}