'use client'

import { useEffect, useState } from 'react'
import Link from 'next/link'
import { PLAN_FEATURES, PLAN_PRICES } from '@rentaldrivego/types'
import { useMarketplacePreferences } from '@/components/MarketplaceShell'
import { marketplaceFetchOrDefault } from '@/lib/api'
import { resolveBrowserAppUrl } from '@/lib/appUrls'

type Billing = 'monthly' | 'annual'

type PricingMatrix = Record<string, Record<string, Record<string, number>>>
type PlanFeatureMap = Record<string, string[]>

type PlatformPricing = {
  prices: PricingMatrix
  planFeatures: PlanFeatureMap
}

export const DEFAULT_PRICING: PlatformPricing = {
  prices: PLAN_PRICES,
  planFeatures: PLAN_FEATURES,
}

const PLANS = [
  {
    key: 'STARTER',
    name: 'Starter',
    tagline: 'Launch your fleet online',
    highlight: false,
  },
  {
    key: 'GROWTH',
    name: 'Growth',
    tagline: 'Scale with confidence',
    highlight: true,
  },
  {
    key: 'PRO',
    name: 'Pro',
    tagline: 'Enterprise-grade power',
    highlight: false,
  },
]

const copy = {
  en: {
    monthly: 'Monthly',
    annual: 'Annual',
    yearly: '/ year',
    youSave: 'You save',
    withAnnual: 'with annual billing — billed as one payment per year.',
    mostPopular: 'Most popular',
    perMonth: '/mo',
    billedAs: 'Billed as',
    getStarted: 'Get started',
    footer: 'All plans include a 90-day free trial. No credit card required.',
  },
  fr: {
    monthly: 'Mensuel',
    annual: 'Annuel',
    yearly: '/ an',
    youSave: 'Vous économisez',
    withAnnual: 'avec la facturation annuelle, prélevée en un seul paiement par an.',
    mostPopular: 'Le plus populaire',
    perMonth: '/mois',
    billedAs: 'Facturé à',
    getStarted: 'Commencer',
    footer: "Toutes les formules incluent un essai gratuit de 90 jours. Aucune carte bancaire n'est requise.",
  },
  ar: {
    monthly: 'شهري',
    annual: 'سنوي',
    yearly: '/ سنة',
    youSave: 'توفر',
    withAnnual: 'مع الفوترة السنوية، تُسدد دفعة واحدة كل سنة.',
    mostPopular: 'الأكثر شيوعاً',
    perMonth: '/شهر',
    billedAs: 'يتم الفوترة بمبلغ',
    getStarted: 'ابدأ الآن',
    footer: 'تشمل جميع الخطط تجربة مجانية لمدة 14 يوماً. لا حاجة إلى بطاقة ائتمان.',
  },
} as const

function getPlanPrice(prices: PricingMatrix, plan: string, billingPeriod: 'MONTHLY' | 'ANNUAL') {
  return (prices[plan]?.[billingPeriod]?.MAD ?? PLAN_PRICES[plan]?.[billingPeriod]?.MAD ?? 0) / 100
}

function annualSavingsPct(prices: PricingMatrix, plan: string): number {
  const monthly = getPlanPrice(prices, plan, 'MONTHLY')
  const annual = getPlanPrice(prices, plan, 'ANNUAL')
  const wouldPay = monthly * 12
  if (wouldPay <= 0) return 0
  return Math.max(0, Math.round(((wouldPay - annual) / wouldPay) * 100))
}

export default function PricingClient({ initialPricing = DEFAULT_PRICING }: { initialPricing?: PlatformPricing }) {
  const { language } = useMarketplacePreferences()
  const dict = copy[language]
  const [billing, setBilling] = useState<Billing>('monthly')
  const [pricing, setPricing] = useState<PlatformPricing>(initialPricing)

  const dashboardUrl = resolveBrowserAppUrl(process.env.NEXT_PUBLIC_DASHBOARD_URL ?? 'http://localhost:3000/dashboard')

  useEffect(() => {
    marketplaceFetchOrDefault<PlatformPricing>('/site/platform/pricing', DEFAULT_PRICING)
      .then(setPricing)
  }, [])

  const savings = annualSavingsPct(pricing.prices, 'STARTER')

  return (
    <div className="space-y-10">
      {/* Billing toggle */}
      <div className="flex items-center justify-center gap-1 rounded-full border border-stone-200 bg-white p-1 shadow-sm dark:border-blue-800 dark:bg-blue-950">
        {(['monthly', 'annual'] as Billing[]).map((b) => (
          <button
            key={b}
            onClick={() => setBilling(b)}
            className={`relative rounded-full px-5 py-2 text-sm font-semibold transition-colors ${
              billing === b
                ? 'bg-blue-900 text-white dark:bg-orange-400 dark:text-white'
                : 'text-stone-600 hover:text-stone-900 dark:text-stone-400 dark:hover:text-stone-100'
            }`}
          >
            {b === 'monthly' ? dict.monthly : dict.annual}
            {b === 'annual' && billing !== 'annual' && (
              <span className="ml-2 rounded-full bg-orange-100 px-2 py-0.5 text-[10px] font-bold text-orange-700 dark:bg-orange-950/50 dark:text-orange-400">
                -{savings}%
              </span>
            )}
          </button>
        ))}
      </div>

      {billing === 'annual' && (
        <p className="text-center text-sm font-medium text-orange-700 dark:text-orange-400">
          {dict.youSave} {savings}% {dict.withAnnual}
        </p>
      )}

      {/* Plan cards */}
      <div className="grid gap-6 md:grid-cols-3">
        {PLANS.map((plan) => {
          const monthlyPrice = getPlanPrice(pricing.prices, plan.key, 'MONTHLY')
          const annualPrice = getPlanPrice(pricing.prices, plan.key, 'ANNUAL')
          const displayPrice = billing === 'annual'
            ? Math.round(annualPrice / 12)
            : monthlyPrice
          const features = pricing.planFeatures[plan.key] ?? PLAN_FEATURES[plan.key] ?? []

          return (
            <div
              key={plan.key}
              className={`card relative flex flex-col overflow-hidden ${
                plan.highlight
                  ? 'border-orange-400 ring-2 ring-orange-400 ring-offset-2 dark:ring-offset-blue-950'
                  : ''
              }`}
            >
              {plan.highlight && (
                <div className="bg-orange-500 dark:bg-orange-400 py-1.5 text-center text-xs font-bold uppercase tracking-widest text-white dark:text-stone-900">
                  {dict.mostPopular}
                </div>
              )}

              <div className="flex flex-1 flex-col p-8">
                <p className="text-xs font-bold uppercase tracking-[0.2em] text-orange-700 dark:text-orange-400">
                  {plan.name}
                </p>
                <p className="mt-1 text-sm text-stone-500 dark:text-stone-400">{plan.tagline}</p>

                <div className="mt-6">
                  <div className="flex items-end gap-1">
                    <span className="text-4xl font-black text-stone-900 dark:text-stone-100">
                      {displayPrice}
                    </span>
                    <span className="mb-1 text-lg font-semibold text-stone-500 dark:text-stone-400">MAD</span>
                    <span className="mb-1 text-sm text-stone-400 dark:text-stone-500">{dict.perMonth}</span>
                  </div>
                  {billing === 'annual' && (
                    <p className="mt-1 text-xs text-stone-400 dark:text-stone-500">
                      {dict.billedAs} {annualPrice} MAD {dict.yearly}
                    </p>
                  )}
                </div>

                <ul className="mt-8 flex-1 space-y-3">
                  {features.map((f) => (
                    <li key={f} className="flex items-start gap-2.5 text-sm text-stone-700 dark:text-stone-300">
                      <svg
                        className="mt-0.5 h-4 w-4 shrink-0 text-orange-500 dark:text-orange-400"
                        fill="none"
                        stroke="currentColor"
                        strokeWidth={2.5}
                        viewBox="0 0 24 24"
                      >
                        <path strokeLinecap="round" strokeLinejoin="round" d="M4.5 12.75l6 6 9-13.5" />
                      </svg>
                      {f}
                    </li>
                  ))}
                </ul>

                <Link
                  href={`${dashboardUrl}/sign-up?plan=${plan.key}&billing=${billing.toUpperCase()}&currency=MAD`}
                  className={`mt-10 block rounded-full px-6 py-3 text-center text-sm font-semibold transition-colors ${
                    plan.highlight
                      ? 'bg-orange-500 text-white hover:bg-orange-600 dark:bg-orange-400 dark:text-stone-900 dark:hover:bg-orange-300'
                      : 'bg-blue-900 text-white hover:bg-orange-700 dark:bg-orange-500 dark:text-white dark:hover:bg-orange-400'
                  }`}
                >
                  {dict.getStarted}
                </Link>
              </div>
            </div>
          )
        })}
      </div>

      {/* Footer note */}
      <p className="text-center text-sm text-stone-400 dark:text-stone-500">{dict.footer}</p>
    </div>
  )
}
