# database/repositories/product_repository.py
from typing import List, Optional
from database.connection import get_connection
from model.product import Product


class ProductRepository:
    def get_all(self) -> List[Product]:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    cur.execute("SELECT * FROM products ORDER BY id")
                    return [
                        Product(
                            id=row[0],
                            name=row[1],
                            category=row[2],
                            min_stock=row[3],
                            optimal_stock=row[4]
                        ) for row in cur.fetchall()
                    ]
        except Exception as e:
            print(f"Ошибка получения продуктов: {e}")
            return []

    def get_by_id(self, product_id: str) -> Optional[Product]:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    cur.execute("SELECT * FROM products WHERE id = %s", (product_id,))
                    row = cur.fetchone()
                    return Product(*row) if row else None
        except Exception as e:
            print(f"Ошибка получения товара {product_id}: {e}")
            return None

    def get_by_category(self, category: str) -> List[Product]:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    cur.execute("SELECT * FROM products WHERE category = %s ORDER BY name", (category,))
                    return [Product(*row) for row in cur.fetchall()]
        except Exception as e:
            print(f"Ошибка получения товаров по категории {category}: {e}")
            return []

    def create_product(self, product_id: str, name: str, category: str,
                       min_stock: int = 10, optimal_stock: int = 100) -> bool:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    cur.execute("""
                        INSERT INTO products (id, name, category, min_stock, optimal_stock)
                        VALUES (%s, %s, %s, %s, %s)
                    """, (product_id, name, category, min_stock, optimal_stock))
                    conn.commit()
                    return cur.rowcount > 0
        except Exception as e:
            print(f"Ошибка создания товара {product_id}: {e}")
            return False

    def update_product(self, product_id: str, name: str = None, category: str = None,
                       min_stock: int = None, optimal_stock: int = None) -> bool:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    updates = []
                    params = []

                    if name is not None:
                        updates.append("name = %s")
                        params.append(name)

                    if category is not None:
                        updates.append("category = %s")
                        params.append(category)

                    if min_stock is not None:
                        updates.append("min_stock = %s")
                        params.append(min_stock)

                    if optimal_stock is not None:
                        updates.append("optimal_stock = %s")
                        params.append(optimal_stock)

                    if not updates:
                        return False

                    params.append(product_id)
                    query = f"UPDATE products SET {', '.join(updates)} WHERE id = %s"

                    cur.execute(query, params)
                    conn.commit()
                    return cur.rowcount > 0
        except Exception as e:
            print(f"Ошибка обновления товара {product_id}: {e}")
            return False

    def delete_product(self, product_id: str) -> bool:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    cur.execute("DELETE FROM products WHERE id = %s", (product_id,))
                    conn.commit()
                    return cur.rowcount > 0
        except Exception as e:
            print(f"Ошибка удаления товара {product_id}: {e}")
            return False

    def search_products(self, search_term: str) -> List[Product]:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    cur.execute("""
                        SELECT * FROM products 
                        WHERE name ILIKE %s OR id ILIKE %s
                        ORDER BY name
                    """, (f'%{search_term}%', f'%{search_term}%'))
                    return [Product(*row) for row in cur.fetchall()]
        except Exception as e:
            print(f"Ошибка поиска товров по названию '{search_term}': {e}")
            return []

    def get_low_stock_products(self) -> List[Product]:
        try:
            with get_connection() as conn:
                with conn.cursor() as cur:
                    cur.execute("""
                        SELECT DISTINCT p.* 
                        FROM products p
                        JOIN inventory_history ih ON p.id = ih.product_id
                        WHERE ih.status IN ('LOW_STOCK', 'CRITICAL')
                        AND ih.scanned_at >= NOW() - INTERVAL '1 day'
                        ORDER BY p.name
                    """)
                    return [Product(*row) for row in cur.fetchall()]
        except Exception as e:
            print(f"Ошибка получения товаров с низким запасом: {e}")
            return []