import mysql, {
  type ResultSetHeader,
  type RowDataPacket,
} from "mysql2/promise";
import dotenv from "dotenv";
import { returnErrorCode } from "../../../services/helperFuncs.js";
import { PRODUCT_ERROR_CODE } from "@stockhome/shared";

dotenv.config();

const pool = mysql.createPool({
  host: process.env.DB_HOST!,
  user: process.env.DB_USER!,
  password: process.env.DB_PASSWORD!,
  database: process.env.DB_NAME!,
});

export const newProduct = async (
  name: string,
  description: string,
  price: string,
  amount: string,
  storage_location: string,
  expiry_date: string,
  bottling_date: string,
): Promise<
  boolean | { success: boolean; code: string; data: null; message: string }
> => {
  const newPrice = price !== "" ? price : null;

  const [result] = await pool.query<ResultSetHeader>(
    "INSERT INTO products (name, description, price, amount, storage_location, expiry_date, bottling_date) VALUES (?, ?, ?, ?, UUID_TO_BIN(?), ?, ?)",
    [
      name,
      description,
      newPrice,
      amount,
      storage_location,
      expiry_date,
      bottling_date,
    ],
  );

  if (result.affectedRows > 0) {
    return {
      success: true,
      code: "SP001",
      data: null,
      message: "New Product successfully created.",
    };
  }

  return returnErrorCode(PRODUCT_ERROR_CODE.PRODUCT_NOT_CREATED);
};

export const productDetails = async (uuid: string) => {
  const [result] = await pool.query<RowDataPacket[]>(
    `SELECT BIN_TO_UUID(p.uuid) AS uuid,
                p.name,
                p.description,
                p.price,
                p.amount,
                BIN_TO_UUID(s.uuid) AS storage_location_uuid,
                s.name              AS storage_location_name,
                p.expiry_date,
                p.bottling_date,
                p.picture
         FROM products p
                  JOIN storage_locations s ON p.storage_location = s.uuid
         WHERE p.uuid = UUID_TO_BIN(?)`,
    [uuid],
  );

  if (result.length > 0) {
    return {
      success: true,
      code: "SP003",
      data: result[0],
      message: "Product details successfully loaded.",
    };
  }

  return returnErrorCode(PRODUCT_ERROR_CODE.PRODUCT_NOT_FOUND);
};

export const allProducts = async () => {
  const [result] = await pool.query<RowDataPacket[]>(`
        SELECT BIN_TO_UUID(p.uuid) AS uuid,
               p.name,
               p.description,
               p.price,
               p.amount,
               BIN_TO_UUID(s.uuid) AS storage_location_uuid,
               s.name              AS storage_location_name,
               p.expiry_date,
               p.bottling_date,
               p.picture,
               p.created_at,
               p.updated_at
        FROM products p
                 JOIN storage_locations s ON p.storage_location = s.uuid
        WHERE p.deleted = 0
    `);

  if (result.length > 0) {
    return {
      success: true,
      code: "SP002",
      data: result,
      message: "All products successfully loaded.",
    };
  }

  return returnErrorCode(PRODUCT_ERROR_CODE.NO_PRODUCTS_FOUND);
};

export const setAmount = async (itemUUID: string, amount: number) => {
  const [result] = await pool.query<ResultSetHeader>(
    `UPDATE products
         SET amount = ?
         WHERE uuid = UUID_TO_BIN(?)`,
    [amount, itemUUID],
  );

  if (result.affectedRows > 0) {
    return {
      success: true,
      code: "SP004",
      data: null,
      message: "Amount successfully updated.",
    };
  }

  return returnErrorCode(PRODUCT_ERROR_CODE.PRODUCT_AMOUNT_NOT_UPDATED);
};

export const updateItem = async (
  itemUUID: string,
  newValues: {
    name: string;
    description: string;
    price: string;
    amount: string;
    storage_location_uuid: string;
    expiry_date: string;
    bottling_date: string;
  },
) => {
  const [result] = await pool.query<ResultSetHeader>(
    `UPDATE products
         SET name             = ?,
             description      = ?,
             price            = ?,
             amount           = ?,
             storage_location = UUID_TO_BIN(?),
             expiry_date      = ?,
             bottling_date    = ?
         WHERE uuid = UUID_TO_BIN(?);`,
    [
      newValues.name,
      newValues.description,
      newValues.price,
      newValues.amount,
      newValues.storage_location_uuid,
      newValues.expiry_date,
      newValues.bottling_date,
      itemUUID,
    ],
  );

  if (result.affectedRows > 0) {
    return {
      success: true,
      code: "SP005",
      data: null,
      message: "Item updated successfully.",
    };
  }

  return returnErrorCode(PRODUCT_ERROR_CODE.PRODUCT_NOT_UPDATED);
};

export const deleteProduct = async (uuid: string) => {
  const [result] = await pool.query<ResultSetHeader>(
    `UPDATE products
         SET deleted = 1
         WHERE uuid = UUID_TO_BIN(?);`,
    [uuid],
  );

  if (result.affectedRows > 0) {
    return {
      success: true,
      code: "SP006",
      data: null,
      message: "Product deleted successfully.",
    };
  }

  return returnErrorCode(PRODUCT_ERROR_CODE.PRODUCT_NOT_DELETED);
};