import {
  defaultCustomization,
  stylePresets,
  type BundleCustomization,
} from "../config";

export function getBundlePresetValues(
  id: string,
): BundleCustomization | undefined {
  const preset = stylePresets.find((item) => item.id === id);
  return preset
    ? { ...defaultCustomization, ...preset.customization }
    : undefined;
}

export function getMatchingBundlePreset(values: BundleCustomization) {
  const normalize = (key: string, value: unknown) => {
    if (key === "fontFamily" && (!value || value === "inherit")) return "";
    return typeof value === "string" && key.toLowerCase().includes("color")
      ? value.toLowerCase()
      : value;
  };
  return stylePresets.find((preset) => {
    const expected = getBundlePresetValues(preset.id)!;
    return (
      Object.keys(defaultCustomization) as (keyof BundleCustomization)[]
    ).every(
      (key) => normalize(key, values[key]) === normalize(key, expected[key]),
    );
  });
}

export const bundlePreviewItems = [
  {
    id: 1,
    name: "Headphones",
    price: 79.99,
    discount: 15,
    image: "headphones.jpg",
  },
  {
    id: 2,
    name: "Phone Case",
    price: 29.99,
    discount: 10,
    image: "phone-case.jpg",
  },
  {
    id: 3,
    name: "USB-C Cable",
    price: 19.99,
    discount: 20,
    image: "usb-c-cable.jpg",
  },
];

export function clampPreviewQuantity(value: number) {
  return Number.isFinite(value)
    ? Math.min(10, Math.max(1, Math.trunc(value)))
    : 1;
}

export function getBundlePreviewTotals(quantities: Record<number, number>) {
  const original = bundlePreviewItems.reduce(
    (sum, item) =>
      sum + item.price * clampPreviewQuantity(quantities[item.id] ?? 1),
    0,
  );
  const total = bundlePreviewItems.reduce(
    (sum, item) =>
      sum +
      item.price *
        (1 - item.discount / 100) *
        clampPreviewQuantity(quantities[item.id] ?? 1),
    0,
  );
  const savings = original - total;
  return { total, savings, percent: Math.round((savings / original) * 100) };
}