"""
FILE: modules/web_api/llm/db/db_tasks.py
"""
import re
from typing import List, Dict, Any, Optional
from .connection import get_db_connection

def normalize_task_id(task_id_input: str) -> str:
    if not task_id_input:
        return ""
    clean_id = str(task_id_input).strip().upper().replace("TASK-", "").replace("TASK", "")
    if clean_id.isdigit():
        num = int(clean_id)
        return f"TASK-{(num):02d}" if num < 100 else f"TASK-{(num):03d}"
    return f"TASK-{clean_id}"

def db_get_tasks(user_id: int) -> List[Dict[str, Any]]:
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("""
        SELECT id, task_id, module, title, priority, status, due_date, created_at 
        FROM tasks 
        WHERE user_id = ?
        ORDER BY id DESC
    """, (user_id,))
    rows = cursor.fetchall()
    conn.close()
    return [dict(r) for r in rows]

def db_add_task(user_id: int, module: str, title: str, priority: str = "MEDIUM", due_date: Optional[str] = None) -> Dict[str, Any]:
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("SELECT MAX(id) FROM tasks")
    max_id = cursor.fetchone()[0] or 0
    new_task_id = f"TASK-{(max_id + 1):02d}"

    cursor.execute("""
        INSERT INTO tasks (task_id, module, title, priority, status, due_date, user_id)
        VALUES (?, ?, ?, ?, 'BACKLOG', ?, ?)
    """, (new_task_id, module, title, priority.upper(), due_date, user_id))
    conn.commit()
    conn.close()
    return {"status": "success", "task_id": new_task_id, "message": f"Задача {new_task_id} создана"}

def db_update_task_status(user_id: int, task_id: str, status: str = "COMPLETED", due_date: Optional[str] = None) -> Dict[str, Any]:
    conn = get_db_connection()
    cursor = conn.cursor()
    formatted_id = normalize_task_id(task_id)
    if due_date:
        cursor.execute("""
            UPDATE tasks 
            SET status = ?, due_date = ? 
            WHERE (UPPER(task_id) = ? OR task_id LIKE ?) AND user_id = ?
        """, (status.upper(), due_date, formatted_id, f"%{task_id.strip()}", user_id))
    else:
        cursor.execute("""
            UPDATE tasks 
            SET status = ? 
            WHERE (UPPER(task_id) = ? OR task_id LIKE ?) AND user_id = ?
        """, (status.upper(), formatted_id, f"%{task_id.strip()}", user_id))

    if cursor.rowcount == 0:
        conn.close()
        return {"error": f"Задача {task_id} не найдена или принадлежит другому пользователю"}
    conn.commit()
    conn.close()
    return {"status": "success", "message": f"Статус задачи {formatted_id} обновлен на {status.upper()}"}

def db_delete_task(user_id: int, task_id: str) -> Dict[str, Any]:
    conn = get_db_connection()
    cursor = conn.cursor()
    formatted_id = normalize_task_id(task_id)
    cursor.execute("""
        DELETE FROM tasks 
        WHERE (UPPER(task_id) = ? OR task_id LIKE ?) AND user_id = ?
    """, (formatted_id, f"%{task_id.strip()}", user_id))
    if cursor.rowcount == 0:
        conn.close()
        return {"error": f"Задача {task_id} не найдена"}
    conn.commit()
    conn.close()
    return {"status": "success", "message": f"Задача {formatted_id} удалена"}