'use client'

import {
  Area,
  AreaChart,
  Bar,
  BarChart,
  CartesianGrid,
  Line,
  LineChart,
  ResponsiveContainer,
  Tooltip,
  XAxis,
  YAxis,
} from 'recharts'
import { InteractiveDemoPlayer } from '@/components/interactive-demo/interactive-demo-player'
import { useDarkMode } from '@/components/interactive-demo/demo-speak'
import { PageFormula, PageMd } from '@/components/interactive-page/page-md'
import { SimBlockView } from '@/components/interactive-page/sim-block'
import { intentColor } from '@/lib/interactive-demo/intent-colors'
import type { IntentId, InteractiveDemoV1 } from '@/lib/interactive-demo/types'
import type { PageBlock } from '@/lib/interactive-page'
import { cn } from '@/lib/utils'

/** Intents actually used inside a demo (legend per demo, brainstorm P11). */
function collectDemoIntents(demo: InteractiveDemoV1): IntentId[] {
  const set = new Set<IntentId>()
  for (const panel of demo.scene.panels) {
    if (panel.type === 'svg-scene') {
      for (const n of panel.payload.nodes) if (n.intent) set.add(n.intent)
      for (const e of panel.payload.edges ?? []) if (e.intent) set.add(e.intent)
    }
    if (panel.type === 'chart') {
      for (const s of panel.payload.series) if (s.intent) set.add(s.intent)
    }
  }
  for (const act of demo.acts) {
    for (const step of act.steps) {
      for (const a of step.annotate ?? []) if (a.intent) set.add(a.intent)
    }
  }
  return [...set]
}

const DEMO_INTENT_LABELS: Record<IntentId, { fr: string; en: string }> = {
  highlight: { fr: 'Focus', en: 'Focus' },
  flow: { fr: 'Flux', en: 'Flow' },
  cache: { fr: 'Mémoire', en: 'Memory' },
  compute: { fr: 'Calcul', en: 'Compute' },
  output: { fr: 'Résultat', en: 'Result' },
  warning: { fr: 'Attention', en: 'Warning' },
}

function DemoLegend({ demo, lang }: { demo: InteractiveDemoV1; lang: string }) {
  const dark = useDarkMode()
  const fr = lang.startsWith('fr')
  const intents = collectDemoIntents(demo)
  if (!intents.length) return null
  return (
    <div className="mt-2 flex flex-wrap items-center gap-3 text-[11px] text-muted-foreground">
      <span className="font-semibold uppercase tracking-[0.14em] text-[10px]">
        {fr ? 'Légende' : 'Legend'}
      </span>
      {intents.map((id) => (
        <span key={id} className="inline-flex items-center gap-1.5">
          <span
            className="inline-block h-2.5 w-2.5 rounded-full"
            style={{ backgroundColor: intentColor(id, dark) }}
          />
          {fr ? DEMO_INTENT_LABELS[id].fr : DEMO_INTENT_LABELS[id].en}
        </span>
      ))}
    </div>
  )
}

const CALLOUT_STYLES: Record<
  string,
  { border: string; bg: string; badge: string }
> = {
  definition: {
    border: 'border-sky-500/30',
    bg: 'bg-sky-500/5',
    badge: 'text-sky-700 dark:text-sky-300',
  },
  warning: {
    border: 'border-amber-500/35',
    bg: 'bg-amber-500/5',
    badge: 'text-amber-800 dark:text-amber-300',
  },
  tip: {
    border: 'border-emerald-500/30',
    bg: 'bg-emerald-500/5',
    badge: 'text-emerald-800 dark:text-emerald-300',
  },
  note: {
    border: 'border-border',
    bg: 'bg-muted/40',
    badge: 'text-muted-foreground',
  },
}

function IntentBadge({
  label,
  intent,
}: {
  label: string
  intent?: IntentId
}) {
  const dark = useDarkMode()
  const color = intentColor(intent, dark)
  return (
    <span
      className="inline-flex rounded-md px-2 py-0.5 text-[10px] font-semibold uppercase tracking-[0.14em]"
      style={{
        color,
        backgroundColor: `${color}22`,
        border: `1px solid ${color}44`,
      }}
    >
      {label}
    </span>
  )
}

function ChartBlockView({
  block,
}: {
  block: Extract<PageBlock, { type: 'chart' }>
}) {
  const dark = useDarkMode()
  const series = block.payload.series
  const maxLen = Math.max(...series.map((s) => s.values.length), 0)
  const data = Array.from({ length: maxLen }, (_, i) => {
    const row: Record<string, number | string> = { i: String(i + 1) }
    for (const s of series) row[s.id] = s.values[i] ?? 0
    return row
  })
  const Chart =
    block.payload.chartType === 'bar'
      ? BarChart
      : block.payload.chartType === 'area'
        ? AreaChart
        : LineChart

  return (
    <figure
      className="my-6 rounded-xl border p-4"
      style={{ background: 'var(--pp-card)', borderColor: 'var(--pp-line)' }}
    >
      <div className="h-56 min-h-[14rem] min-w-0 w-full">
        <ResponsiveContainer width="100%" height="100%">
          <Chart data={data} margin={{ top: 8, right: 12, left: 0, bottom: 4 }}>
            <CartesianGrid
              strokeDasharray="3 3"
              stroke={dark ? 'rgba(255,255,255,0.08)' : 'rgba(0,0,0,0.08)'}
            />
            <XAxis dataKey="i" tick={{ fontSize: 11 }} axisLine={false} tickLine={false} />
            <YAxis tick={{ fontSize: 11 }} width={36} axisLine={false} tickLine={false} />
            <Tooltip />
            {series.map((s) => {
              const stroke = intentColor(s.intent, dark)
              if (block.payload.chartType === 'bar') {
                return (
                  <Bar
                    key={s.id}
                    dataKey={s.id}
                    fill={stroke}
                    radius={[4, 4, 0, 0]}
                    isAnimationActive={false}
                  />
                )
              }
              if (block.payload.chartType === 'area') {
                return (
                  <Area
                    key={s.id}
                    type="monotone"
                    dataKey={s.id}
                    stroke={stroke}
                    fill={stroke}
                    fillOpacity={0.22}
                    strokeWidth={2}
                    isAnimationActive={false}
                  />
                )
              }
              return (
                <Line
                  key={s.id}
                  type="monotone"
                  dataKey={s.id}
                  stroke={stroke}
                  strokeWidth={2.5}
                  dot={false}
                  isAnimationActive={false}
                />
              )
            })}
          </Chart>
        </ResponsiveContainer>
      </div>
      {block.caption ? (
        <figcaption className="mt-3 text-sm text-muted-foreground">
          {block.caption}
        </figcaption>
      ) : null}
    </figure>
  )
}

export function PageBlockView({
  block,
  demoMode = 'static',
  lang = 'fr',
}: {
  block: PageBlock
  demoMode?: 'interactive' | 'static'
  lang?: string
}) {
  if (block.type === 'prose') {
    return <PageMd md={block.md} className="my-4 text-[17px] leading-[1.7]" />
  }

  if (block.type === 'formula') {
    return <PageFormula tex={block.tex} caption={block.caption} />
  }

  if (block.type === 'callout') {
    const style = CALLOUT_STYLES[block.kind] ?? CALLOUT_STYLES.note!
    return (
      <aside
        className={cn(
          'my-5 rounded-xl border px-4 py-3.5 shadow-sm',
          style.border,
          style.bg
        )}
      >
        <p
          className={cn(
            'mb-1.5 text-[10px] font-semibold uppercase tracking-[0.16em]',
            style.badge
          )}
        >
          {block.kind} · {block.title}
        </p>
        <PageMd md={block.md} className="text-[15px] [&_p]:my-1" />
      </aside>
    )
  }

  if (block.type === 'demo') {
    return (
      <figure className="my-8">
        {block.caption ? (
          <p className="mb-3 text-[15px] leading-relaxed text-muted-foreground">
            {block.caption}
          </p>
        ) : null}
        <InteractiveDemoPlayer demo={block.demo} mode={demoMode} />
        <DemoLegend demo={block.demo} lang={lang} />
        {demoMode === 'static' ? (
          <noscript>
            <ol className="mt-3 list-inside list-decimal space-y-1 text-sm text-muted-foreground">
              {block.demo.acts.flatMap((a) =>
                a.steps.map((s) => (
                  <li key={s.id}>
                    <strong>{a.title}</strong> — {s.speak}
                  </li>
                ))
              )}
            </ol>
          </noscript>
        ) : null}
      </figure>
    )
  }

  if (block.type === 'sim') {
    return <SimBlockView block={block} lang={lang} />
  }

  if (block.type === 'chart') {
    return <ChartBlockView block={block} />
  }

  if (block.type === 'stats') {
    return (
      <div className="my-8 grid grid-cols-2 gap-3 md:grid-cols-4">
        {block.items.map((item, i) => (
          <div
            key={`${item.label}-${i}`}
            className="rounded-[14px] border px-4 py-3.5"
            style={{ background: 'var(--pp-paper)', borderColor: 'var(--pp-line)' }}
          >
            <p
              className="font-extrabold leading-tight tabular-nums"
              style={{
                fontSize: 'clamp(22px, 2.4vw, 30px)',
                color: 'var(--pp-plum)',
              }}
            >
              {item.value}
            </p>
            <p className="mt-1.5 text-[13px] leading-snug" style={{ color: 'var(--pp-ink)' }}>
              {item.label}
            </p>
          </div>
        ))}
      </div>
    )
  }

  if (block.type === 'table') {
    return (
      <figure
        className="my-6 overflow-x-auto rounded-xl border"
        style={{ borderColor: 'var(--pp-line)', background: 'var(--pp-card)' }}
      >
        <table className="w-full min-w-[460px] border-collapse text-[13.5px]">
          {block.caption ? (
            <caption
              className="px-3 py-2.5 text-left text-xs"
              style={{ fontFamily: 'var(--pp-mono)', color: 'var(--pp-muted)' }}
            >
              {block.caption}
            </caption>
          ) : null}
          <thead>
            <tr style={{ borderBottom: '1px solid var(--pp-line)', background: 'var(--pp-paper)' }}>
              {block.columns.map((c) => (
                <th
                  key={c}
                  className="px-3 py-2.5 text-left font-semibold tracking-tight"
                >
                  {c}
                </th>
              ))}
            </tr>
          </thead>
          <tbody>
            {block.rows.map((row, ri) => (
              <tr
                key={ri}
                style={{ borderBottom: ri < block.rows.length - 1 ? '1px solid var(--pp-line)' : undefined }}
                className="last:border-0"
              >
                {row.map((cell, ci) => (
                  <td key={ci} className="px-3 py-2.5 align-top">
                    <PageMd md={cell} className="text-sm [&_p]:my-0" />
                  </td>
                ))}
              </tr>
            ))}
          </tbody>
        </table>
      </figure>
    )
  }

  if (block.type === 'image') {
    return (
      <figure className="my-6">
        { }
        <img
          src={block.src}
          alt={block.alt}
          className="mx-auto max-h-[480px] w-auto max-w-full rounded-xl border border-border/50 shadow-sm"
        />
        {block.caption ? (
          <figcaption className="mt-2 text-center text-sm text-muted-foreground">
            {block.caption}
          </figcaption>
        ) : null}
      </figure>
    )
  }

  return null
}

export { IntentBadge }