import { useState } from 'react';
import { Link } from 'react-router-dom';
import { ChevronLeft, Crown, CheckCircle2, Sparkles, Cpu } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { useTranslation } from '@/contexts/language';
import { useSasquatchPro } from '@/hooks/useSasquatchPro';
import { PRO_TIERS } from '@/lib/sasquatchPro';
import { DURATION_TIERS, PLATFORM_FEES, FEE_META, tierPriceSats, tierPerDaySats, type FeeType } from '@/hooks/usePlatformFee';
import { SasquatchProDialog } from '@/components/SasquatchProDialog';
import { useLabProfiles } from '@/hooks/useLabProfiles';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { labProfilePath } from '@/lib/labRoutes';
import { dateLocaleCode } from '@/lib/dateFnsI18n';
import { cn } from '@/lib/utils';

/**
 * Settings → Pro & Support.
 *
 * One honest home for every paid extra: what it does, the duration tiers and
 * effective per-day price, your current status, and the free alternatives.
 * Nothing here holds funds — each purchase is a one-off Lightning payment.
 */
export function ProSupportScreen({ onBack }: { onBack: () => void }) {
  const { t } = useTranslation();
  const { isPro, expiresAt } = useSasquatchPro();
  const { user } = useCurrentUser();
  const { data: profiles } = useLabProfiles(100);
  const [proOpen, setProOpen] = useState(false);

  const now = Math.floor(Date.now() / 1000);
  const daysLeft = isPro && expiresAt ? Math.max(0, Math.ceil((expiresAt - now) / 86400)) : 0;
  const fmt = (secs: number) => new Date(secs * 1000).toLocaleDateString(dateLocaleCode(), { month: 'short', day: 'numeric', year: 'numeric' });

  const featured = (profiles ?? []).filter((p) => p.pubkey === user?.pubkey && p.featuredUntil && p.featuredUntil > now);

  return (
    <div>
      <div className="flex items-center gap-3 mb-5">
        <button
          onClick={onBack}
          aria-label={t('common.back')}
          className="flex items-center justify-center w-8 h-8 rounded-xl bg-white/5 hover:bg-white/10 active:scale-95 transition-all"
        >
          <ChevronLeft className="h-4 w-4 text-white" />
        </button>
        <h2 className="text-lg font-black uppercase tracking-wide text-white">{t('settingsUi.proSupport.title')}</h2>
      </div>

      <div className="space-y-4">
        {/* Honest framing */}
        <div className="rounded-2xl border border-[#ccff00]/20 bg-[#ccff00]/5 p-4">
          <p className="flex items-center gap-2 text-sm font-bold text-[#ccff00]">
            <CheckCircle2 className="h-4 w-4" /> {t('settingsUi.proSupport.prepaidTitle')}
          </p>
          <p className="mt-1 text-xs text-muted-foreground leading-relaxed">{t('settingsUi.proSupport.prepaidBody')}</p>
        </div>

        {/* Sasquatch Pro */}
        <div className="rounded-2xl border border-white/8 p-4 bg-white/2">
          <div className="flex items-start gap-3">
            <div className="flex h-9 w-9 flex-shrink-0 items-center justify-center rounded-xl bg-emerald-500/15">
              <Sparkles className="h-4 w-4 text-emerald-400" />
            </div>
            <div className="min-w-0 flex-1">
              <p className="text-sm font-black uppercase tracking-wide text-white">{t('settingsUi.proSupport.sasquatchTitle')}</p>
              <p className="mt-0.5 text-xs text-muted-foreground leading-relaxed">{t('settingsUi.proSupport.sasquatchBenefit')}</p>
              <p className={cn('mt-1 text-xs font-bold', isPro ? 'text-emerald-400' : 'text-gray-500')}>
                {isPro
                  ? expiresAt
                    ? `${t('settingsUi.proSupport.activeUntil', { date: fmt(expiresAt) })} · ${t('settingsUi.proSupport.daysLeft', { count: daysLeft })}`
                    : t('settingsUi.proSupport.active')
                  : t('settingsUi.proSupport.notActive')}
              </p>
            </div>
          </div>

          <div className="mt-3 grid grid-cols-2 gap-2 sm:grid-cols-4">
            {PRO_TIERS.map((tier) => (
              <div key={tier.id} className={cn('rounded-xl border p-2.5 text-center', tier.popular ? 'border-emerald-500/50 bg-emerald-500/10' : 'border-white/10')}>
                <p className="text-xs font-bold text-white">{t(tier.labelKey)}</p>
                <p className="mt-1 text-sm font-black text-white">{tier.sats.toLocaleString()}</p>
                <p className="text-[10px] text-muted-foreground">{t('common.sats')} · {Math.round(tier.sats / tier.days)}/{t('settingsUi.proSupport.day')}</p>
                {tier.badgeKey && <p className="mt-1 text-[10px] font-bold text-emerald-400">{t(tier.badgeKey)}</p>}
              </div>
            ))}
          </div>

          <Button onClick={() => setProOpen(true)} className="mt-3 w-full gap-2 bg-[#ccff00] font-black uppercase text-black hover:bg-[#ccff00]/90">
            <Crown className="h-4 w-4" /> {isPro ? t('settingsUi.proSupport.extend') : t('settingsUi.proSupport.goPro')}
          </Button>
        </div>

        {/* Featured placement */}
        <div className="rounded-2xl border border-white/8 p-4 bg-white/2">
          <div className="flex items-start gap-3">
            <div className="flex h-9 w-9 flex-shrink-0 items-center justify-center rounded-xl bg-amber-500/15">
              <Cpu className="h-4 w-4 text-amber-400" />
            </div>
            <div className="min-w-0 flex-1">
              <p className="text-sm font-black uppercase tracking-wide text-white">{t('settingsUi.proSupport.featuredTitle')}</p>
              <p className="mt-0.5 text-xs text-muted-foreground leading-relaxed">{t('settingsUi.proSupport.featuredBenefit')}</p>
            </div>
          </div>

          <div className="mt-3 space-y-3">
            {(Object.keys(PLATFORM_FEES) as FeeType[]).map((type) => (
              <div key={type}>
                <p className="text-xs font-bold text-gray-300">
                  <span className="mr-1">{FEE_META[type].emoji}</span>{FEE_META[type].label}
                  <span className="ml-2 font-normal text-muted-foreground">{FEE_META[type].benefit}</span>
                </p>
                <div className="mt-1.5 grid grid-cols-2 gap-1.5 sm:grid-cols-4">
                  {DURATION_TIERS.map((tier) => (
                    <div key={tier.id} className={cn('rounded-lg border p-2 text-center', tier.bestValue ? 'border-[#ccff00]/40 bg-[#ccff00]/5' : 'border-white/10')}>
                      <p className="text-[11px] font-bold text-white">{tier.label}</p>
                      <p className="text-xs font-black text-white">{tierPriceSats(type, tier).toLocaleString()}</p>
                      <p className="text-[10px] text-muted-foreground">{tierPerDaySats(type, tier).toLocaleString()}/{t('settingsUi.proSupport.day')}</p>
                    </div>
                  ))}
                </div>
              </div>
            ))}
          </div>
          <p className="mt-3 text-xs text-muted-foreground">{t('settingsUi.proSupport.featuredHow')}</p>
        </div>

        {/* Your featured listings */}
        <div className="rounded-2xl border border-white/8 p-4 bg-white/2">
          <p className="text-sm font-black uppercase tracking-wide text-white">{t('settingsUi.proSupport.yourFeatured')}</p>
          {featured.length === 0 ? (
            <p className="mt-1 text-xs text-muted-foreground">{t('settingsUi.proSupport.noneFeatured')}</p>
          ) : (
            <div className="mt-2 space-y-1.5">
              {featured.map((p) => (
                <Link
                  key={p.id}
                  to={labProfilePath(p.profileType, p.pubkey, p.identifier)}
                  className="flex items-center justify-between gap-2 rounded-lg border border-white/10 bg-white/5 px-3 py-2 text-xs font-bold text-gray-200 hover:bg-white/10"
                >
                  <span className="truncate">{p.title}</span>
                  <span className="flex-shrink-0 text-amber-400">{t('settingsUi.proSupport.featuredUntil', { date: fmt(p.featuredUntil!) })}</span>
                </Link>
              ))}
            </div>
          )}
        </div>

        {/* Free paths */}
        <div className="rounded-2xl border border-white/8 p-4 bg-white/2">
          <p className="text-sm font-black uppercase tracking-wide text-white">{t('settingsUi.proSupport.freeTitle')}</p>
          <p className="mt-1 text-xs text-muted-foreground leading-relaxed">{t('settingsUi.proSupport.freeBody')}</p>
        </div>
      </div>

      <SasquatchProDialog open={proOpen} onOpenChange={setProOpen} />
    </div>
  );
}