Pricing Two Tier

"use client";

// Ported from SmoothUI Pricing 3 (MIT, © 2024 Eduardo Calvo). See THIRD_PARTY_NOTICES.md.
import {
  useId,
  useState,
  type ComponentPropsWithRef,
  type CSSProperties,
  type ReactNode,
} from "react";

import { Badge } from "@/components/badge";
import { Button } from "@/components/button";
import { Card } from "@/components/card";
import { Label } from "@/components/label";
import { PriceFlow } from "@/components/number-flow";
import { RadioGroup, RadioGroupItem } from "@/components/radio-group";
import { cn } from "@/lib/utils";

/*
 * Two plans side by side — a free tier and a featured paid one — under a
 * monthly/annual switch.
 *
 * The switch is a segmented control: a radio group whose pill slides between
 * the two options. Changing it rewrites every price on the page at once, so,
 * as in Dowel's `pricing` block, the change is announced politely, and each
 * price rolls to its new value through Price Flow rather than the source's
 * hand-rolled digit reels. Each plan's call to action carries the plan's name,
 * so two "Get started" buttons are distinguishable out of context. The
 * cards rise in on mount with a staggered keyframe; the reduced-motion scale
 * collapses it, and the pill and the digits settle instantly.
 */

const PREFIX = "dowel-pricing-two-tier";

const STYLES = `
@keyframes ${PREFIX}-rise{from{opacity:0;translate:0 2.5rem}}
[data-slot=pricing-two-tier-plans]>*{animation:${PREFIX}-rise var(--duration-slow) var(--ease-out-quint) both;animation-delay:calc(var(--${PREFIX}-index,0) * 100ms * var(--motion-scale,1))}
`;

export type BillingPeriod = "monthly" | "yearly";

export interface PricingTierPlan {
  id: string;
  name: string;
  /** A short line after the price, e.g. "Best for teams". */
  tagline?: string;
  description?: ReactNode;
  /** Monthly price in whole currency units. `null` means a custom price. */
  monthly: number | null;
  /** Price per month when billed yearly. Omit to bill yearly at the monthly rate. */
  yearly?: number;
  features: string[];
  /** Marks the recommended plan, with a badge and an accent. At most one. */
  featured?: boolean;
  /** The call to action: a link when it has an `href`, otherwise a button. */
  cta: { label: string; href?: string; onSelect?: () => void };
}

export interface PricingTwoTierLabels {
  /** Names the billing-period control. */
  period: string;
  monthly: string;
  yearly: string;
  /** Badge on the featured plan. */
  featured: string;
  /** Shown in place of a price when `monthly` is null. */
  custom: string;
  perMonth: string;
  perMonthBilledYearly: string;
  /** Introduces each plan's feature list. */
  included: string;
  /** Appended, visually hidden, to each call to action. */
  planSuffix: (plan: string) => string;
  /** Announced when the period changes. */
  announce: (period: BillingPeriod) => string;
}

const DEFAULT_LABELS: PricingTwoTierLabels = {
  period: "Billing period",
  monthly: "Monthly",
  yearly: "Annually",
  featured: "Recommended",
  custom: "Custom",
  perMonth: "per month",
  perMonthBilledYearly: "per month, billed yearly",
  included: "What’s included:",
  planSuffix: (plan) => `, ${plan} plan`,
  announce: (period) => `Showing ${period} pricing.`,
};

export const DEFAULT_PRICING_TWO_TIER_PLANS: PricingTierPlan[] = [
  {
    id: "hobby",
    name: "Hobby",
    tagline: "Perfect for personal projects",
    description:
      "Deploy personal projects and experiment with the latest web technologies. Ideal for learning and side projects.",
    monthly: 0,
    features: [
      "100 GB bandwidth",
      "Unlimited personal projects",
      "Community support",
      "Automatic HTTPS",
      "Global CDN",
      "Preview deployments",
    ],
    cta: { label: "Get started", href: "#hobby" },
  },
  {
    id: "pro",
    name: "Pro",
    tagline: "For production",
    description:
      "Advanced deployment features for production applications, for teams building and scaling professional web apps.",
    monthly: 25,
    yearly: 12,
    featured: true,
    features: [
      "Everything in Hobby",
      "Unlimited bandwidth",
      "Team collaboration",
      "Priority support",
      "Advanced analytics",
      "Password protection",
      "Custom domains",
      "Edge functions",
      "Scheduled jobs",
      "Webhooks",
    ],
    cta: { label: "Get started", href: "#pro" },
  },
];

export interface PricingTwoTierBlockProps extends Omit<
  ComponentPropsWithRef<"section">,
  "title"
> {
  heading?: ReactNode;
  description?: ReactNode;
  plans?: PricingTierPlan[];
  /** ISO 4217 code, formatted by Intl.NumberFormat. */
  currency?: string;
  /** Formatting locale. Defaults to the reader's. */
  locale?: Intl.LocalesArgument;
  /** Controlled billing period. */
  period?: BillingPeriod;
  /** Initial billing period when uncontrolled. */
  defaultPeriod?: BillingPeriod;
  onPeriodChange?: (period: BillingPeriod) => void;
  /** Shows the monthly/annual control. */
  showPeriodToggle?: boolean;
  /** Visible and announced text, for localisation. */
  labels?: Partial<PricingTwoTierLabels>;
  /** Level of the section heading; each plan name is one level below. */
  headingLevel?: 1 | 2 | 3 | 4 | 5 | 6;
}

const PERIODS: BillingPeriod[] = ["monthly", "yearly"];

/** A segmented monthly/annual control: a radio group with a sliding pill. */
function PeriodControl({
  period,
  onChange,
  labels,
}: {
  period: BillingPeriod;
  onChange: (period: BillingPeriod) => void;
  labels: PricingTwoTierLabels;
}) {
  return (
    <RadioGroup
      value={period}
      onValueChange={(value) => {
        onChange(value as BillingPeriod);
      }}
      orientation="horizontal"
      aria-label={labels.period}
      data-slot="pricing-two-tier-period"
      className="relative mx-auto grid w-fit grid-cols-2 gap-0 rounded-full border border-border bg-background p-1"
    >
      <span
        aria-hidden="true"
        data-period={period}
        className={cn(
          "pointer-events-none absolute inset-y-1 start-1 w-[calc(50%-0.25rem)] rounded-full bg-primary shadow-sm",
          "transition-[inset-inline-start] duration-[var(--duration-slower)] ease-[var(--ease-in-out-quint)]",
          "data-[period=yearly]:start-1/2",
        )}
      />
      {PERIODS.map((value) => (
        <Label
          key={value}
          data-active={period === value || undefined}
          className={cn(
            "relative h-8 min-w-24 cursor-pointer justify-center rounded-full px-4 text-sm font-normal text-foreground",
            "transition-colors duration-[var(--duration-slow)] hover:opacity-75",
            "data-[active]:font-medium data-[active]:text-primary-foreground",
            "has-[:focus-visible]:ring-2 has-[:focus-visible]:ring-ring/55 has-[:focus-visible]:ring-offset-2 has-[:focus-visible]:ring-offset-background",
          )}
        >
          {/* Covers the label, invisibly: the label draws the option and names the radio. */}
          <RadioGroupItem
            value={value}
            className="absolute inset-0 aspect-auto size-full rounded-full border-0 bg-transparent opacity-0 shadow-none"
          />
          <span className="relative">{labels[value]}</span>
        </Label>
      ))}
    </RadioGroup>
  );
}

/** A tick in a filled circle. Decorative: the feature's text carries the meaning. */
function Tick() {
  return (
    <span
      aria-hidden="true"
      className="flex size-4 shrink-0 items-center justify-center rounded-full bg-foreground text-background"
    >
      <svg viewBox="0 0 20 20" fill="currentColor" className="size-2.5">
        <path
          fillRule="evenodd"
          clipRule="evenodd"
          d="M16.7 5.3a1 1 0 0 1 0 1.4l-8 8a1 1 0 0 1-1.4 0l-4-4a1 1 0 1 1 1.4-1.4L8 12.6l7.3-7.3a1 1 0 0 1 1.4 0z"
        />
      </svg>
    </span>
  );
}

/** Two plans side by side under a monthly/annual switch, with prices that roll. */
export function PricingTwoTierBlock({
  heading = "Deploy faster with Pro",
  description = "Scale your applications with advanced deployment features and priority support.",
  plans = DEFAULT_PRICING_TWO_TIER_PLANS,
  currency = "EUR",
  locale,
  period: periodProp,
  defaultPeriod = "yearly",
  onPeriodChange,
  showPeriodToggle = true,
  labels: labelsProp,
  headingLevel = 2,
  className,
  ...props
}: PricingTwoTierBlockProps) {
  const labels = { ...DEFAULT_LABELS, ...labelsProp };
  const headingId = useId();
  const listId = useId();
  const [uncontrolled, setUncontrolled] = useState(defaultPeriod);
  const period = periodProp ?? uncontrolled;
  const Heading = `h${String(headingLevel)}` as "h2";
  const PlanHeading = `h${String(Math.min(headingLevel + 1, 6))}` as "h3";

  function changePeriod(next: BillingPeriod) {
    if (periodProp === undefined) setUncontrolled(next);
    onPeriodChange?.(next);
  }

  return (
    <section
      aria-labelledby={headingId}
      data-slot="pricing-two-tier"
      className={cn("w-full bg-muted/50 py-16 md:py-32", className)}
      {...props}
    >
      <style href={PREFIX} precedence="dowel">
        {STYLES}
      </style>
      <div className="mx-auto max-w-5xl px-4 sm:px-6">
        <div className="mx-auto max-w-2xl text-center">
          <Heading
            id={headingId}
            className="text-3xl font-bold text-balance md:text-4xl lg:text-5xl lg:tracking-tight"
          >
            {heading}
          </Heading>
          {description ? (
            <p className="mx-auto mt-4 max-w-xl text-lg text-balance text-muted-foreground">
              {description}
            </p>
          ) : null}
          {showPeriodToggle ? (
            <div className="my-12">
              <PeriodControl period={period} onChange={changePeriod} labels={labels} />
            </div>
          ) : (
            <div className="my-8" />
          )}
        </div>

        {/* Every price changes at once, which nobody asked for out loud. */}
        <p aria-live="polite" className="sr-only">
          {labels.announce(period)}
        </p>

        <ul
          data-slot="pricing-two-tier-plans"
          className="grid grid-cols-1 gap-6 md:grid-cols-2"
        >
          {plans.map((plan, index) => {
            const price =
              plan.monthly === null
                ? null
                : period === "yearly"
                  ? (plan.yearly ?? plan.monthly)
                  : plan.monthly;
            const cta = (
              <>
                {plan.cta.label}
                <span className="sr-only">{labels.planSuffix(plan.name)}</span>
              </>
            );
            return (
              <li
                key={plan.id}
                className="flex"
                style={{ [`--${PREFIX}-index`]: index } as CSSProperties}
              >
                <Card
                  data-featured={plan.featured || undefined}
                  className={cn(
                    "relative w-full overflow-hidden rounded-2xl p-8",
                    plan.featured && "border-primary shadow-lg ring-1 ring-primary",
                  )}
                >
                  {plan.featured ? (
                    <span
                      aria-hidden="true"
                      className="absolute end-0 top-0 h-4 w-32 rounded-es-2xl bg-linear-to-r from-primary via-info to-success"
                    />
                  ) : null}
                  <div className="mb-4 flex flex-wrap items-center gap-2">
                    <PlanHeading className="text-2xl font-bold text-foreground">
                      {plan.name}
                    </PlanHeading>
                    {plan.featured ? <Badge size="sm">{labels.featured}</Badge> : null}
                  </div>

                  <div className="mb-6">
                    <p className="flex flex-wrap items-baseline gap-x-2">
                      {price === null ? (
                        <span className="text-3xl font-semibold text-foreground">
                          {labels.custom}
                        </span>
                      ) : (
                        <PriceFlow
                          value={price}
                          locales={locale}
                          format={{ style: "currency", currency, maximumFractionDigits: 0 }}
                          className="text-3xl font-semibold text-foreground"
                        />
                      )}
                      {plan.tagline ? (
                        <>
                          <span aria-hidden="true" className="text-muted-foreground">
                            •
                          </span>
                          <span className="text-muted-foreground">{plan.tagline}</span>
                        </>
                      ) : null}
                    </p>
                    {price === null ? null : (
                      <p className="mt-1 text-xs text-muted-foreground">
                        {period === "yearly" && plan.yearly !== undefined
                          ? labels.perMonthBilledYearly
                          : labels.perMonth}
                      </p>
                    )}
                  </div>

                  {plan.cta.href ? (
                    <Button
                      asChild
                      variant={plan.featured ? "gradient" : "outline"}
                      className="mb-6 w-full"
                    >
                      <a href={plan.cta.href}>{cta}</a>
                    </Button>
                  ) : (
                    <Button
                      variant={plan.featured ? "gradient" : "outline"}
                      className="mb-6 w-full"
                      onClick={plan.cta.onSelect}
                    >
                      {cta}
                    </Button>
                  )}

                  {plan.description ? (
                    <p className="mb-6 flex-1 text-sm leading-relaxed text-muted-foreground">
                      {plan.description}
                    </p>
                  ) : null}

                  <p
                    id={`${listId}-${plan.id}`}
                    className="mb-4 text-xs font-medium tracking-wider text-muted-foreground uppercase"
                  >
                    {labels.included}
                  </p>
                  <ul aria-labelledby={`${listId}-${plan.id}`} className="flex flex-col gap-3">
                    {plan.features.map((feature) => (
                      <li
                        key={feature}
                        className="flex items-center gap-3 text-sm text-foreground"
                      >
                        <Tick />
                        {feature}
                      </li>
                    ))}
                  </ul>
                </Card>
              </li>
            );
          })}
        </ul>
      </div>
    </section>
  );
}