import json
import sqlite3
import logging
from typing import List, Dict, Any, Optional
from datetime import datetime, timedelta

logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
logger = logging.getLogger("DB_TOOLS")

DB_PATH = "/home/puh/scud_orion_ai_v2/data/scud_orion_ai.db"

def db_get_current_server_time() -> Dict[str, Any]:
    now = datetime.now()
    days_ru = ["понедельник", "вторник", "среда", "четверг", "пятница", "суббота", "воскресенье"]
    return {
        "current_date": now.strftime("%d.%m.%Y"),
        "current_time": now.strftime("%H:%M:%S"),
        "day_of_week": days_ru[now.weekday()],
        "iso_date": now.strftime("%Y-%m-%d")
    }

def smart_parse_date(date_str: Optional[str], original_user_message: str = "") -> Optional[str]:
    """
    Дата уже точно подготовлена моделью на основе системного календаря.
    Возвращаем date_str без повторной тяжелой фильтрации.
    """
    return date_str

def db_save_chat_message(session_id: str, role: str, content: str):
    if not content:
        return
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("""
        INSERT INTO chat_messages (session_id, role, content, created_at)
        VALUES (?, ?, ?, CURRENT_TIMESTAMP)
    """, (session_id, role, content))
    conn.commit()
    conn.close()

def db_get_chat_history(session_id: str, limit: int = 20) -> List[Dict[str, Any]]:
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("""
        SELECT role, content FROM chat_messages 
        WHERE session_id = ? 
        ORDER BY id DESC LIMIT ?
    """, (session_id, limit))
    rows = cursor.fetchall()
    conn.close()
    return [{"role": r["role"], "content": r["content"]} for r in reversed(rows)]

def db_get_snapshots(session_id: str = "web_session_main", date_str: Optional[str] = None, original_user_message: str = "") -> Dict[str, Any]:
    date_str = smart_parse_date(date_str, original_user_message)
    
    conn = get_db_connection()
    cursor = conn.cursor()
    
    query = """
        SELECT snapshot_id, log_date, snapshot_time, COUNT(*) as record_count 
        FROM scud_logs 
    """
    params = []
    
    if date_str:
        # Приводим дату ДД.ММ.ГГГГ к ISO YYYY-MM-DD
        iso_date = date_str
        if "." in date_str:
            parts = date_str.split(".")
            if len(parts) == 3:
                iso_date = f"{parts[2]}-{parts[1]}-{parts[0]}"
        
        # Строгий поиск: ищем совпадение строго по log_date или началу snapshot_time/created_at
        query += " WHERE log_date = ? OR log_date = ? OR snapshot_time LIKE ? OR created_at LIKE ? "
        params.extend([date_str, iso_date, f"{iso_date}%", f"{iso_date}%"])
        
    query += " GROUP BY snapshot_id ORDER BY id DESC LIMIT 20"
    
    cursor.execute(query, params)
    rows = cursor.fetchall()
    snapshots = [dict(r) for r in rows]
    
    result_data = {
        "query_date": date_str or "все",
        "snapshots_count": len(snapshots),
        "snapshots": snapshots
    }
    
    db_set_session_state(
        session_id=session_id, 
        state_type="SNAPSHOTS_VIEW", 
        data=json.dumps(result_data, ensure_ascii=False)
    )
    
    conn.close()
    return result_data

def get_db_connection():
    conn = sqlite3.connect(DB_PATH, timeout=30.0)
    conn.row_factory = sqlite3.Row
    conn.execute("PRAGMA journal_mode = WAL;")
    conn.execute("PRAGMA synchronous = NORMAL;")
    return conn

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"}

def db_get_active_system_prompt() -> str:
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("SELECT prompt_text FROM system_prompts WHERE is_active = 1 ORDER BY id DESC LIMIT 1")
    row = cursor.fetchone()
    conn.close()
    return row["prompt_text"] if row else "Ты — ИИ-ассистент SCUD Orion AI."

def db_add_system_prompt(name: str, prompt_text: str) -> Dict[str, Any]:
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor()
            cursor.execute("BEGIN IMMEDIATE;")
            
            cursor.execute("SELECT id FROM system_prompts WHERE name = ?", (name,))
            existing = cursor.fetchone()
            
            if existing:
                cursor.execute(
                    "UPDATE system_prompts SET prompt_text = ?, is_active = 1, updated_at = CURRENT_TIMESTAMP WHERE name = ?",
                    (prompt_text, name)
                )
            else:
                cursor.execute(
                    "INSERT INTO system_prompts (name, prompt_text, is_active) VALUES (?, ?, 1)",
                    (name, prompt_text)
                )
                
            conn.commit()
            
        logger.info("Системный промпт успешно сохранен и применен в базе данных.")
        return {"status": "success", "message": "Системный промпт успешно обновлен"}
    except Exception as e:
        logger.error(f"Ошибка при сохранении промпта в БД: {e}")
        return {"status": "error", "error": str(e)}

def db_get_rules() -> List[Dict[str, Any]]:
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("SELECT id, rule_text FROM ai_knowledge_base ORDER BY id ASC")
    rows = cursor.fetchall()
    conn.close()
    return [dict(r) for r in rows]

def db_set_session_state(session_id: str, state_type: str, data: str):
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("""
        INSERT INTO session_states (session_id, state_type, pending_data, updated_at)
        VALUES (?, ?, ?, CURRENT_TIMESTAMP)
        ON CONFLICT(session_id) DO UPDATE SET
            state_type = excluded.state_type,
            pending_data = excluded.pending_data,
            updated_at = CURRENT_TIMESTAMP
    """, (session_id, state_type, data))
    conn.commit()
    conn.close()

def db_get_session_state(session_id: str) -> Optional[Dict[str, Any]]:
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("SELECT state_type, pending_data FROM session_states WHERE session_id = ?", (session_id,))
    row = cursor.fetchone()
    conn.close()
    return dict(row) if row else None

def db_clear_session_state(session_id: str):
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("DELETE FROM session_states WHERE session_id = ?", (session_id,))
    conn.commit()
    conn.close()

def db_get_stats() -> Dict[str, Any]:
    """Возвращает общую статистику по количеству записей во всех таблицах БД."""
    conn = get_db_connection()
    cursor = conn.cursor()
    tables = ['scud_logs', 'zup_staff', 'zup_absences', 'anomalies_history', 'ai_knowledge_base', 'system_prompts', 'session_states', 'tasks']
    stats = {}
    for t in tables:
        try:
            cursor.execute(f"SELECT COUNT(*) FROM {t}")
            stats[t] = cursor.fetchone()[0]
        except Exception:
            stats[t] = 0
    conn.close()
    return {"status": "success", "tables_stats": stats}

def db_get_anomalies(limit: int = 100, date_str: Optional[str] = None) -> Dict[str, Any]:
    """Возвращает историю аномалий СКУД с опциональной фильтрацией по дате."""
    conn = get_db_connection()
    cursor = conn.cursor()
    
    query = "SELECT anomaly_date, fio, anomaly_type, details FROM anomalies_history"
    params = []
    
    if date_str:
        query += " WHERE anomaly_date = ?"
        params.append(date_str)
        
    query += " ORDER BY id DESC LIMIT ?"
    params.append(limit)
    
    cursor.execute(query, params)
    rows = cursor.fetchall()
    conn.close()
    
    anomalies_list = [dict(r) for r in rows]
    return {
        "status": "success", 
        "count": len(anomalies_list), 
        "anomalies": anomalies_list
    }

def db_get_session_states() -> Dict[str, Any]:
    """Возвращает список всех активных сессий и состояний превью."""
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("SELECT session_id, state_type, updated_at FROM session_states")
    rows = cursor.fetchall()
    conn.close()
    return {"status": "success", "active_sessions": [dict(r) for r in rows]}

def db_delete_snapshots(snapshot_id: Optional[str] = None, day_str: Optional[str] = None) -> Dict[str, Any]:
    """Удаляет снапшот по ID или за конкретную дату."""
    if not snapshot_id and not day_str:
        return {"status": "error", "message": "Необходимо указать snapshot_id или day_str (ДД.ММ.ГГГГ)."}
    
    conn = get_db_connection()
    cursor = conn.cursor()
    
    if snapshot_id:
        cursor.execute("DELETE FROM scud_logs WHERE snapshot_id = ?", (snapshot_id,))
        deleted = cursor.rowcount
    else:
        cursor.execute("DELETE FROM scud_logs WHERE log_date = ? OR snapshot_id LIKE ?", (day_str, f"%{day_str.replace('.', '')}%"))
        deleted = cursor.rowcount
        
    conn.commit()
    conn.close()
    return {"status": "success", "message": f"Успешно удалено записей: {deleted}"}    

def db_get_reference(category: Optional[str] = None) -> Dict[str, Any]:
    """Возвращает системные справочники и примеры команд для оператора."""
    conn = get_db_connection()
    cursor = conn.cursor()
    
    query = "SELECT category, title, example_prompt, description FROM system_reference"
    params = []
    
    if category:
        query += " WHERE category = ?"
        params.append(category)
        
    query += " ORDER BY id ASC"
    cursor.execute(query, params)
    rows = cursor.fetchall()
    conn.close()
    
    return {
        "status": "success",
        "count": len(rows),
        "reference_items": [dict(r) for r in rows]
    }