/**
 * Copyright (c) 2026-present, Goldman Sachs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type { TraderProfileItem } from '@finos/legend-server-marketplace';
import { MAX_PRODUCT_IMAGE_COUNT } from '../../stores/lakehouse/dataProducts/ProductCardState.js';

// ─── String labels ───────────────────────────────────────────────────────────

export enum OrderProfileLabel {
  CHIP_LABEL = 'Order Profile',
  ALREADY_HAVE_ACCESS = 'Already have access',
  ADD_TO_CART = 'Add to cart',
  IN_CART = 'In Cart',
  ADDING = 'Adding...',
  SELECT_TERMINAL_TITLE = 'Select Terminal',
  SELECT_TERMINAL_DESCRIPTION = 'All Add-Ons will be added automatically after the terminal is confirmed.',
  CANCEL = 'Cancel',
  CLOSE = 'Close',
  OWNED_SUFFIX = '(Owned)',
  IN_CART_SUFFIX = '(In Cart)',
  MODEL_PREFIX = 'Model: ',
  PRICE_TOTAL_SEPARATOR = ' · Total: ',
  VIEW_DETAILS = 'View details',
}

export enum OrderProfileTableHeader {
  PRODUCT_NAME = 'PRODUCT NAME',
  PROVIDER = 'PROVIDER',
  CATEGORY = 'CATEGORY',
  COST_MONTHLY = 'COST (Monthly)',
}

// ─── Image URL ──────────────────────────────────────────────────────────────────

/**
 * Returns a stable random product image URL for a given asset base URL.
 * Intended to be called once inside a `useState` initialiser so the image
 * does not change on re-renders.
 */
export const getRandomImageUrl = (assetUrl: string): string => {
  const randomValue = crypto.getRandomValues(new Uint32Array(1))[0] ?? 0;
  const randomIndex = (randomValue % MAX_PRODUCT_IMAGE_COUNT) + 1;
  return `${assetUrl}/images${randomIndex}.jpg`;
};

// ─── Price formatting ─────────────────────────────────────────────────────────

const USD_FORMATTER = new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
  minimumFractionDigits: 2,
  maximumFractionDigits: 2,
});

/** Formats a price as a plain USD string, e.g. "$1,234.56". Used in detail tables. */
export const formatItemPrice = (price: number): string =>
  USD_FORMATTER.format(price);

/** Formats a price with a "/month" suffix for display on cards. */
export const formatCardPrice = (price: number): string =>
  `${USD_FORMATTER.format(price)}/month`;

// ─── Toast message formatters ────────────────────────────────────────────────

export const formatAddToCartSuccessMessage = (productName: string): string =>
  `Order profile ${productName} has been successfully added to cart.`;

export const formatAddToCartErrorMessage = (
  productName: string,
  errorMessage: string,
): string => `Failed to add ${productName} to cart: ${errorMessage}`;

// ─── Item summary helpers ─────────────────────────────────────────────────────

export const getItemSummary = (
  items: TraderProfileItem[],
): { terminalCount: number; addOnCount: number } => {
  const terminalCount = items.filter((item) => item.isTerminal).length;
  return { terminalCount, addOnCount: items.length - terminalCount };
};

export const formatProfileSummaryLine = (
  terminalCount: number,
  addOnCount: number,
): string => {
  const terminalLabel =
    terminalCount === 1 ? '1 Terminal' : `${terminalCount} Terminals`;
  const addOnLabel = addOnCount === 1 ? '1 Add-On' : `${addOnCount} Add-Ons`;
  return `${terminalLabel} · ${addOnLabel}`;
};

// ─── Multiselect price calculation ──────────────────────────────────────────

/**
 * Calculates the total price for a multiselect order profile.
 * Finds the highest-priced terminal and sums it with its associated add-ons.
 * Returns `undefined` when there are no terminal items.
 */
export const calculateMultiselectTotalPrice = (
  items: TraderProfileItem[],
): number | undefined => {
  const terminals = items.filter((item) => item.isTerminal && !item.isOwned);
  if (terminals.length === 0) {
    return undefined;
  }
  const highestTerminal = terminals.reduce((max, curr) =>
    curr.price > max.price ? curr : max,
  );
  const addOns = items.filter(
    (item) =>
      !item.isTerminal && !item.isOwned && item.model === highestTerminal.model,
  );
  const addOnsTotal = addOns.reduce((sum, item) => sum + item.price, 0);
  return highestTerminal.price + addOnsTotal;
};

// ─── Grouping ─────────────────────────────────────────────────────────────────

/**
 * Groups items so that each vendor-profile (terminal) is immediately followed
 * by its associated add-ons (matched by item.model).  Unmatched add-ons are
 * appended at the end.
 */
export const groupOrderProfileItems = (
  items: TraderProfileItem[],
): { item: TraderProfileItem; isSubItem: boolean }[] => {
  const result: { item: TraderProfileItem; isSubItem: boolean }[] = [];

  const terminals = items.filter((i) => i.isTerminal);
  const addOns = items.filter((i) => !i.isTerminal);
  const matchedAddonIds = new Set<number>();

  for (const terminal of terminals) {
    result.push({ item: terminal, isSubItem: false });
    if (terminal.model !== undefined && terminal.model !== null) {
      for (const addon of addOns) {
        if (addon.model === terminal.model && !matchedAddonIds.has(addon.id)) {
          result.push({ item: addon, isSubItem: true });
          matchedAddonIds.add(addon.id);
        }
      }
    }
  }

  for (const addon of addOns) {
    if (!matchedAddonIds.has(addon.id)) {
      result.push({ item: addon, isSubItem: false });
    }
  }

  return result;
};