"""
===============================================================================
FILE: modules/ai_engine/handlers/task_handler.py
PROJECT: SCUD Orion AI (Unified Architecture)
MODULE: modules / ai_engine / handlers
ROLE: Изолированная обработка вызовов инструментов задач (get, edit, delete, export).

AI-CONTEXT-ANCHORS:
  - ANCHOR[TASK_HANDLER_DISPATCH]: Обработка вызовов db_get_tasks и db_tasks_edit.
===============================================================================
"""

from typing import Dict, Any, Tuple, Optional
from services.tasks.service import get_tasks, execute_task_action
from modules.web_api.llm.db.db_chat import db_save_chat_message, db_get_chat_history
from modules.web_api.llm.db.db_prompts import db_set_session_state


# ANCHOR[TASK_HANDLER_DISPATCH]
def handle_tasks_call(
    fn_name: str, 
    fn_args: Dict[str, Any], 
    user_id: int, 
    session_id: str
) -> Tuple[str, list, Optional[Dict[str, Any]]]:
    """Обрабатывает нативные tool-вызовы по задачам."""
    
    # 1. Просмотр задач
    if fn_name == "db_get_tasks":
        raw_tasks = get_tasks(user_id, status=fn_args.get("status"))
        reply_text = "Вот интерактивный список ваших текущих задач:"
        db_save_chat_message(session_id, "assistant", reply_text, is_ephemeral=1)
        return reply_text, db_get_chat_history(session_id), {
            "type": "TASK_INTERACTIVE_CARD",
            "tasks": raw_tasks
        }

    # 2. Модификация / Удаление / Экспорт
    action = (fn_args.get("action") or "UPDATE").upper()
    if fn_name == "db_add_task": action = "ADD"
    elif fn_name == "db_delete_task": action = "DELETE"
    elif fn_name == "db_update_task_status": action = "UPDATE"

    # Двухфазное подтверждение удаления
    if action == "DELETE":
        task_id_raw = str(fn_args.get("task_id", "")).replace("#", "").replace("TASK-", "").strip()
        db_set_session_state(session_id, "TASK_DELETE_CONFIRM", {"task_id": task_id_raw, "idle_turns": 0})
        reply_text = f"Вы действительно хотите удалить задачу #{task_id_raw}?"
        db_save_chat_message(session_id, "assistant", reply_text, is_ephemeral=1)
        return reply_text, db_get_chat_history(session_id), {
            "type": "TASK_DELETE_CONFIRM",
            "buttons": [
                {"label": f"Удалить #{task_id_raw}", "value": f"подтверждаю удаление задачи {task_id_raw}", "style": "danger"},
                {"label": "Отмена", "value": "отмена", "style": "secondary"}
            ]
        }

    # Экспорт в Markdown
    elif action == "EXPORT":
        export_res = execute_task_action(
            user_id=user_id, 
            action="EXPORT", 
            filename=fn_args.get("filename"),
            status=fn_args.get("status")
        )
        reply_text = export_res.get("message", "Отчет по задачам успешно экспортирован.")
        db_save_chat_message(session_id, "assistant", reply_text, is_ephemeral=0)
        
        action_payload = None
        if export_res.get("status") == "success":
            action_payload = {
                "type": "FILE_DOWNLOAD_CARD",
                "filename": export_res.get("filename"),
                "download_url": export_res.get("download_url"),
                "tasks_count": export_res.get("tasks_count")
            }
        return reply_text, db_get_chat_history(session_id), action_payload

    # Создание и обновление
    else:
        res = execute_task_action(
            user_id=user_id,
            action=action,
            task_id=fn_args.get("task_id"),
            title=fn_args.get("title"),
            priority=fn_args.get("priority", "MEDIUM"),
            status=fn_args.get("status"),
            module=fn_args.get("module", "general"),
            due_date=fn_args.get("due_date")
        )
        raw_tasks = get_tasks(user_id)
        reply_text = res.get("message", "Операция над задачами выполнена.")
        db_save_chat_message(session_id, "assistant", reply_text, is_ephemeral=1)
        return reply_text, db_get_chat_history(session_id), {
            "type": "TASK_INTERACTIVE_CARD",
            "tasks": raw_tasks
        }