'use client';

import Link from 'next/link';
import { motion } from 'framer-motion';
import { useLocale } from '@/lib/i18n/locale-context';
import type { PostContent, Block } from '@/lib/content/posts';
import { cn } from '@/lib/utils';

const FA_DIGITS = ['۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹'] as const;
const toFa = (s: string | number) =>
  s.toString().replace(/\d/g, (d) => FA_DIGITS[Number(d)]);

type Meta = { title: string; category: string; readTime: number };

const ACCENT_TEXT: Record<PostContent['accent'], string> = {
  electric: 'text-electric',
  violet: 'text-violet',
  magenta: 'text-magenta',
  emerald: 'text-emerald',
  cyan: 'text-cyan',
};
const ACCENT_BORDER: Record<PostContent['accent'], string> = {
  electric: 'border-electric/30 bg-electric/5 text-electric',
  violet: 'border-violet/30 bg-violet/5 text-violet',
  magenta: 'border-magenta/30 bg-magenta/5 text-magenta',
  emerald: 'border-emerald/30 bg-emerald/5 text-emerald',
  cyan: 'border-cyan/30 bg-cyan/5 text-cyan',
};

export function BlogArticle({
  meta,
  content,
}: {
  meta: { fa: Meta; en: Meta };
  content: PostContent;
}) {
  const { t, locale } = useLocale();
  const m = meta[locale];
  const body = content[locale];
  const dir = locale === 'fa' ? 'rtl' : 'ltr';

  const dateLabel = new Intl.DateTimeFormat(
    locale === 'fa' ? 'fa-IR' : 'en-US',
    { year: 'numeric', month: 'long', day: 'numeric' },
  ).format(new Date(content.date));

  return (
    <article dir={dir} className="relative px-5 py-32 sm:px-8">
      {/* Cover glow */}
      <div
        aria-hidden
        className="pointer-events-none absolute inset-x-0 top-0 -z-10 h-80 bg-radial-aurora opacity-60"
      />

      <div className="mx-auto max-w-3xl">
        <Link
          href="/#blog"
          className="label-mono inline-flex items-center gap-2 text-slate-400 transition-colors hover:text-electric"
        >
          <span className={locale === 'fa' ? 'rotate-180' : ''}>←</span>
          {t.nav.blog}
        </Link>

        <motion.div
          initial={{ opacity: 0, y: 20 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ duration: 0.6, ease: [0.22, 1, 0.36, 1] }}
        >
          <div className="mt-7 flex flex-wrap items-center gap-3">
            <span
              className={cn(
                'rounded-full border px-2.5 py-0.5 font-mono text-[0.65rem] uppercase tracking-wider',
                ACCENT_BORDER[content.accent],
              )}
            >
              {m.category}
            </span>
            <span className="font-mono text-[0.7rem] text-slate-500">
              {dateLabel}
            </span>
            <span className="font-mono text-[0.7rem] text-slate-500">
              {locale === 'fa' ? toFa(m.readTime) : m.readTime}{' '}
              {t.blog.readTimeSuffix}
            </span>
          </div>

          <h1
            className={cn(
              'mt-5 font-display text-[clamp(2rem,4.5vw,3.2rem)] font-extrabold leading-[1.08] tracking-tight text-white',
              locale === 'fa' && 'font-fa',
            )}
          >
            {m.title}
          </h1>

          <p className="mt-6 text-balance text-[clamp(1.05rem,1.8vw,1.3rem)] leading-relaxed text-slate-300">
            {body.lead}
          </p>
        </motion.div>

        {/* Body */}
        <div className="mt-12 flex flex-col gap-6">
          {body.blocks.map((block, i) => (
            <BlockView key={i} block={block} accent={content.accent} />
          ))}
        </div>

        {/* CTA */}
        <div className="mt-16 border-t border-white/5 pt-10">
          <p className="text-slate-400">
            {locale === 'fa'
              ? 'این موضوع به سیستم شما مربوط است؟ بیایید درباره‌اش صحبت کنیم.'
              : 'Is this relevant to your system? Let’s talk it through.'}
          </p>
          <div className="mt-5 flex flex-wrap gap-3">
            <Link href="/#contact" className="btn-primary">
              {t.hero.ctaPrimary}
            </Link>
            <Link href="/#blog" className="btn-ghost">
              {t.nav.blog}
            </Link>
          </div>
        </div>
      </div>
    </article>
  );
}

function BlockView({
  block,
  accent,
}: {
  block: Block;
  accent: PostContent['accent'];
}) {
  switch (block.k) {
    case 'h2':
      return (
        <h2 className="mt-4 font-display text-[clamp(1.3rem,2.4vw,1.7rem)] font-semibold leading-snug text-white">
          {block.t}
        </h2>
      );
    case 'p':
      return (
        <p className="text-[1.02rem] leading-[1.85] text-slate-300">
          {block.t}
        </p>
      );
    case 'ul':
      return (
        <ul className="flex flex-col gap-2.5">
          {block.items.map((it, i) => (
            <li key={i} className="flex gap-3 text-[1.02rem] leading-relaxed text-slate-300">
              <span className={cn('mt-2 h-1.5 w-1.5 shrink-0 rounded-full', `bg-current ${ACCENT_TEXT[accent]}`)} />
              <span>{it}</span>
            </li>
          ))}
        </ul>
      );
    case 'quote':
      return (
        <blockquote
          className={cn(
            'my-2 border-s-2 ps-5 text-[1.1rem] font-medium italic leading-relaxed text-slate-200',
            accent === 'magenta' ? 'border-magenta' : 'border-electric',
          )}
        >
          {block.t}
        </blockquote>
      );
    case 'code':
      return (
        <pre className="overflow-x-auto rounded-xl border border-white/10 bg-base-900/80 p-4 font-mono text-[0.85rem] leading-relaxed text-slate-200">
          <code>{block.t}</code>
        </pre>
      );
  }
}