'use client';

import { useState } from 'react';
import { useRouter } from 'next/navigation';
import { useAuth } from '@/contexts/AuthContext';
import { useT, useRegion } from '@/contexts/LocaleContext';

type TierId = 'free' | 'africa' | 'analyst' | 'desk';

interface TierConfig {
  id: TierId;
  name: string;
  price: string;
  originalPrice?: string;
  cadence: string;
  badge?: string;
  headline: string;
  cta: string;
  features: string[];
  locked: string[];
  highlight: boolean;
}

const TIERS: TierConfig[] = [
  {
    id: 'free',
    name: 'Free',
    price: '$0',
    cadence: '/mo',
    headline: 'Try the model. No card required.',
    cta: 'Start Free',
    features: [
      '5 reads to try the model',
      'Grade letter + projection',
      'Cross-book line comparison',
      'Confidence indicator',
    ],
    locked: [
      'Factor analysis (3-signal preview)',
      'Kill conditions (locked preview)',
      'Alt line ladder (locked)',
    ],
    highlight: false,
  },
  // Session 12 — VYNDR Africa tier ($4.99/mo). Slotted between Free
  // and Analyst. Pricing component reorders dynamically based on
  // locale (African-language users see this first).
  {
    id: 'africa',
    name: 'VYNDR Africa',
    price: '$4.99',
    cadence: '/mo',
    headline: 'Built for African mobile bettors.',
    cta: 'Unlock Africa Pricing',
    features: [
      '10 reads per day',
      'Full factor analysis — every signal the model weighs',
      'Kill conditions surfaced inline',
      'Grade + reasoning visible',
      'World Cup soccer intelligence',
    ],
    locked: [
      'Scratch cascade alerts (Analyst+)',
      'Alt line ladder (Desk only)',
    ],
    highlight: false,
  },
  {
    id: 'analyst',
    name: 'Analyst',
    price: '$14.99',
    originalPrice: '$19.99',
    cadence: '/mo',
    badge: 'Founder Access',
    headline: 'The full intelligence layer.',
    cta: 'Lock Founder Price',
    features: [
      'Unlimited reads',
      'Full factor analysis — every signal the model weighs',
      'Kill conditions surfaced inline',
      'Scratch cascade alerts when players are pulled',
      'Parlay leg history with grades',
      'Sportsbook deep links',
    ],
    locked: [
      'Alt line ladder (Desk only)',
      'Kelly sizing (Desk only)',
    ],
    highlight: false,
  },
  {
    // DS5 (Part 6, #8) — Desk is THE hero tier. It carries the value-showing
    // story and the single primary CTA on the grid (color contract #9: never
    // two competing green CTAs). $44.99 regular, $34.99 for founders.
    id: 'desk',
    name: 'Desk',
    price: '$34.99',
    originalPrice: '$44.99',
    cadence: '/mo',
    badge: 'Founder Desk',
    headline: 'The professional terminal. Everything the model knows.',
    cta: 'Claim a Founder Desk',
    features: [
      'Everything in Analyst',
      'Alt line ladder + edge ranking',
      'Quarter-Kelly sizing recommendations',
      'Real-time intelligence feed',
      'Parlay correlation analysis (phi)',
      'Consensus vs model comparison',
    ],
    locked: [],
    highlight: true,
  },
];

export default function Pricing() {
  const router = useRouter();
  const { session, loading: authLoading } = useAuth();
  const { inAfrica } = useRegion();
  const t = useT();
  const [pending, setPending] = useState<TierId | null>(null);
  const [error, setError] = useState<string | null>(null);

  // Session 13 — Africa tier visibility + order is now driven by
  // REAL IP geolocation via Cloudflare's CF-IPCountry header (stamped
  // onto x-vyndr-country by the middleware). The previous locale-
  // based proxy (Swahili speakers everywhere) was both too narrow
  // (most African users browse in English/French) and too broad
  // (Swahili speakers outside Africa got the discount).
  //
  // Inside Africa: VYNDR Africa renders first, then Free, then Analyst, Desk.
  // Outside Africa: the Africa tier card is filtered out of the render
  //                 entirely — no path for non-African users to even
  //                 see the $4.99 option.
  // Unknown country (local dev, non-Cloudflare): degrades closed →
  //                 Africa tier hidden (same as outside Africa).
  const orderedTiers = inAfrica
    ? [TIERS.find((x) => x.id === 'africa')!, TIERS.find((x) => x.id === 'free')!,
       TIERS.find((x) => x.id === 'analyst')!, TIERS.find((x) => x.id === 'desk')!]
    : TIERS.filter((x) => x.id !== 'africa');

  async function startCheckout(tier: TierId) {
    setError(null);

    // Free tier short-circuits — no checkout, just signup.
    if (tier === 'free') {
      router.push('/signup');
      return;
    }

    // Session 15 — Africa short-circuit removed. The Session 14
    // backend now handles 'africa' end-to-end: validation accepts
    // it, and when STRIPE_PRICE_AFRICA isn't configured the route
    // returns 503 { code: 'tier_unconfigured', error: '...' } which
    // the existing error-display path below surfaces inline. No
    // special-case needed at the UI layer.

    // Anonymous → bounce to signup with a returnTo back to /#pricing.
    if (!session) {
      router.push('/signup?return=/%23pricing');
      return;
    }

    setPending(tier);
    try {
      const res = await fetch('/api/checkout', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          Authorization: `Bearer ${session.access_token}`,
        },
        body: JSON.stringify({ tier }),
      });
      const data = (await res.json().catch(() => ({}))) as { url?: string; error?: string };
      if (!res.ok || !data.url) {
        setError(data.error || 'Checkout creation failed. Try again in a moment.');
        setPending(null);
        return;
      }
      // Hand off to Stripe. The success_url returns the user to
      // /upgrade/success?session_id=… — no further client work needed.
      window.location.assign(data.url);
    } catch {
      setError('Network error. Try again.');
      setPending(null);
    }
  }

  return (
    <section
      id="pricing"
      style={{
        padding: '96px 24px',
        borderTop: '1px solid var(--border)',
      }}
    >
      <div style={{ maxWidth: 1200, margin: '0 auto' }}>
        <header style={{ textAlign: 'center', maxWidth: 720, margin: '0 auto 64px' }}>
          <h2
            className="text-balance"
            style={{ fontSize: 'clamp(28px, 4vw, 44px)', fontWeight: 700, letterSpacing: '-0.02em', marginBottom: 16 }}
          >
            Pricing built for bettors. Not for SaaS investors.
          </h2>
          <p style={{ fontSize: 17, color: 'var(--text-secondary)' }}>
            First 100 users lock $14.99/mo for life. Beta pricing — this price dies at user 101.
          </p>
        </header>

        {error && (
          <div
            role="alert"
            style={{
              maxWidth: 720,
              margin: '0 auto 24px',
              padding: 14,
              border: '1px solid var(--grade-d, #ff5a5a)',
              color: 'var(--grade-d, #ff5a5a)',
              fontSize: 14,
              textAlign: 'center',
              borderRadius: 8,
            }}
          >
            {error}
          </div>
        )}

        <div
          className="pricing-grid"
          style={{
            display: 'grid',
            gap: 24,
            // The desktop column count tracks the visible tier count
            // (3 outside Africa, 4 inside). styled-jsx's `:global()`
            // doesn't handle attribute selectors cleanly, so we pin
            // the value via a CSS custom property on the grid root.
            ['--pricing-cols' as keyof React.CSSProperties]: String(orderedTiers.length),
          } as React.CSSProperties}
        >
          {orderedTiers.map((tier, i) => {
            const isPending = pending === tier.id;
            const isDisabled = authLoading || (pending !== null && !isPending);
            return (
              <article
                key={tier.id}
                className={`surface diagonal-cut${tier.highlight ? ' diagonal-cut-strong' : ''} animate-fade-up stagger-${i + 1}`}
                style={{
                  padding: 32,
                  position: 'relative',
                  border: tier.highlight ? '1px solid var(--grade-a)' : '1px solid var(--border)',
                  background: tier.highlight ? 'var(--bg-elevated)' : 'var(--bg-surface)',
                  boxShadow: tier.highlight ? '0 16px 48px var(--accent-glow)' : 'none',
                }}
              >
                {tier.badge && (
                  <div
                    className="mono"
                    style={{
                      position: 'absolute',
                      top: -12,
                      left: 24,
                      padding: '4px 12px',
                      background: 'var(--grade-a)',
                      color: 'var(--bg-primary)',
                      fontSize: 10,
                      fontWeight: 800,
                      letterSpacing: '0.08em',
                      borderRadius: 999,
                      textTransform: 'uppercase',
                    }}
                  >
                    {tier.badge}
                  </div>
                )}
                <h3 style={{ fontSize: 14, fontWeight: 600, color: 'var(--text-secondary)', marginBottom: 4, textTransform: 'uppercase', letterSpacing: '0.08em' }}>
                  {tier.name}
                </h3>
                <div style={{ display: 'flex', alignItems: 'baseline', gap: 8, marginBottom: 4 }}>
                  <span className="mono" style={{ fontSize: 40, fontWeight: 800, color: 'var(--text-primary)', letterSpacing: '-0.03em' }}>
                    {tier.price}
                  </span>
                  <span style={{ color: 'var(--text-tertiary)', fontSize: 14 }}>{tier.cadence}</span>
                  {tier.originalPrice && (
                    <span className="mono" style={{ fontSize: 13, color: 'var(--text-tertiary)', textDecoration: 'line-through' }}>
                      {tier.originalPrice}
                    </span>
                  )}
                </div>
                <p style={{ fontSize: 14, color: 'var(--text-secondary)', marginBottom: 24, minHeight: 42 }}>
                  {tier.headline}
                </p>

                <button
                  type="button"
                  onClick={() => startCheckout(tier.id)}
                  disabled={isDisabled}
                  className={tier.highlight ? 'btn-primary' : 'btn-ghost'}
                  style={{
                    width: '100%',
                    padding: 14,
                    marginBottom: 24,
                    cursor: isDisabled ? 'not-allowed' : 'pointer',
                    opacity: isDisabled ? 0.6 : 1,
                  }}
                >
                  {isPending ? 'Redirecting to Stripe…' : tier.cta}
                </button>

                <ul style={{ display: 'grid', gap: 10 }}>
                  {tier.features.map((f) => (
                    <li key={f} style={{ display: 'flex', gap: 10, fontSize: 14 }}>
                      <span style={{ color: 'var(--grade-a)', fontWeight: 700 }} aria-hidden>+</span>
                      <span style={{ color: 'var(--text-primary)' }}>{f}</span>
                    </li>
                  ))}
                  {tier.locked.map((f) => (
                    <li key={f} style={{ display: 'flex', gap: 10, fontSize: 14, color: 'var(--text-tertiary)' }}>
                      <span aria-hidden>—</span>
                      <span>{f}</span>
                    </li>
                  ))}
                </ul>
              </article>
            );
          })}
        </div>

        <p style={{ textAlign: 'center', fontSize: 13, color: 'var(--text-tertiary)', marginTop: 32 }}>
          Cancel anytime. No contracts. Card / Apple Pay / Google Pay — payments processed by Stripe. First 100 users lock $14.99/mo Analyst for life.
        </p>
      </div>

      <style jsx>{`
        :global(.pricing-grid) {
          grid-template-columns: 1fr;
        }
        @media (min-width: 768px) {
          :global(.pricing-grid) {
            grid-template-columns: repeat(2, 1fr);
          }
        }
        @media (min-width: 1100px) {
          :global(.pricing-grid) {
            /* --pricing-cols is set by the React render (3 outside
               Africa, 4 inside) so the desktop layout tracks the
               visible tier count without an attribute selector. */
            grid-template-columns: repeat(var(--pricing-cols, 3), 1fr);
          }
        }
      `}</style>
    </section>
  );
}
