import { lazy, Suspense, useState, type ReactNode } from 'react'
import { ChevronRight } from 'lucide-react'
import { Link } from 'react-router'
import { assetPath } from '@/components/layout/nav-items'
import { PageError, PageHeader } from '@/components/page'
import { Skeleton } from '@/components/skeleton'
import { usePortfolio } from '@/lib/assets'
import { formatDateTime, formatMoney, toIsoDate } from '@/lib/format'
import { isFetchStale, kindEmoji, qty, splitAssets } from '@/lib/savings'
import { t } from '@/lib/strings'
import { cn } from '@/lib/utils'
import type { Portfolio } from '@/types/Portfolio'
import type { PortfolioItem } from '@/types/PortfolioItem'
import { AddCurrency } from './add-currency'
import { Notice, Pl, RateLine } from './parts'

const s = t.assets

/** Recharts büyük → dağılım grafiği ayrı parça */
const AllocationChart = lazy(() => import('./allocation-chart'))

export function SavingsPage() {
  const portfolio = usePortfolio()
  return (
    <>
      <PageHeader title={t.pages.savings.title} description={t.pages.savings.description} />
      {portfolio.isError ? (
        <PageError message={portfolio.error.message} onRetry={portfolio.refetch} />
      ) : !portfolio.data ? (
        <div role="status" aria-label={t.common.loading} className="space-y-4">
          <Skeleton className="h-32" />
          <Skeleton className="h-64" />
        </div>
      ) : (
        <SavingsView p={portfolio.data} />
      )}
    </>
  )
}

function SavingsView({ p }: { p: Portfolio }) {
  const [now] = useState(() => new Date())
  const today = toIsoDate(now)
  const { held, others } = splitAssets(p.items)
  const hasValue = p.value_total > 0

  return (
    <div className="space-y-6">
      <Summary p={p} />
      {p.last_fetch === null ? (
        <Notice tone="warning">{s.noFetch}</Notice>
      ) : isFetchStale(p.last_fetch, now) ? (
        <Notice tone="warning">{s.staleFetch}</Notice>
      ) : null}
      {p.unpriced > 0 && <Notice tone="warning">{s.unpriced(p.unpriced)}</Notice>}

      <div className={cn('grid items-start gap-4', hasValue && 'lg:grid-cols-[2fr_3fr]')}>
        {hasValue && (
          <Suspense fallback={<Skeleton className="h-80" />}>
            <AllocationChart p={p} />
          </Suspense>
        )}
        <section aria-labelledby="assets-title" className="rounded-2xl border bg-card p-4 sm:p-5">
          <h2 id="assets-title" className="mb-2 font-semibold">
            {s.listTitle}
          </h2>
          {held.length === 0 ? (
            <p className="text-sm text-muted-foreground">{s.empty}</p>
          ) : (
            <ul className="divide-y">
              {held.map((i) => (
                <AssetRow key={i.asset.id} item={i} today={today} />
              ))}
            </ul>
          )}
        </section>
      </div>

      {others.length > 0 && (
        <details className="group rounded-2xl border bg-card p-4 sm:p-5" open={held.length === 0}>
          <summary className="flex min-h-11 cursor-pointer items-center justify-between font-semibold">
            {s.othersTitle(others.length)}
            <ChevronRight
              className="size-4 transition-transform group-open:rotate-90"
              aria-hidden
            />
          </summary>
          <p className="mb-2 text-sm text-muted-foreground">{s.othersHint}</p>
          <ul className="divide-y">
            {others.map((i) => (
              <AssetRow key={i.asset.id} item={i} today={today} compact />
            ))}
          </ul>
        </details>
      )}

      <AddCurrency />
    </div>
  )
}

function Summary({ p }: { p: Portfolio }) {
  return (
    <section aria-label={s.totalValue} className="grid grid-cols-2 gap-3 lg:grid-cols-4">
      <div className="col-span-2 rounded-2xl border-2 border-primary/40 bg-primary/5 p-4 lg:col-span-1">
        <p className="text-sm text-muted-foreground">{s.totalValue}</p>
        <p className="money text-3xl font-bold tracking-tight">{formatMoney(p.value_total)}</p>
        {p.last_fetch && (
          <p className="mt-1 text-xs text-muted-foreground">
            {s.ratesAt(formatDateTime(p.last_fetch))}
          </p>
        )}
      </div>
      <Tile label={s.cost}>
        <span className="money">{formatMoney(p.cost_total)}</span>
      </Tile>
      <Tile label={s.unrealized} hint={s.unrealizedHint}>
        <Pl pl={p.unrealized_pl_total} cost={p.cost_total} stacked />
      </Tile>
      {/* Mobilde 3. küçük kart tek kalmasın: tam genişlik */}
      <Tile label={s.realized} hint={s.realizedHint} className="col-span-2 lg:col-span-1">
        <Pl pl={p.realized_pl_total} cost={0} />
      </Tile>
    </section>
  )
}

function Tile({
  label,
  hint,
  className,
  children,
}: {
  label: string
  hint?: string
  className?: string
  children: ReactNode
}) {
  return (
    <div className={cn('rounded-2xl border bg-card p-4', className)}>
      <p className="text-sm text-muted-foreground">{label}</p>
      <p className="mt-1 text-lg font-semibold">{children}</p>
      {hint && <p className="mt-1 text-xs text-muted-foreground">{hint}</p>}
    </div>
  )
}

function AssetRow({
  item: i,
  today,
  compact,
}: {
  item: PortfolioItem
  today: string
  compact?: boolean
}) {
  const a = i.asset
  return (
    <li>
      <Link
        to={assetPath(a.id)}
        className="-mx-2 flex min-h-14 items-center gap-3 rounded-lg px-2 py-2.5 hover:bg-muted"
      >
        <span aria-hidden className="text-2xl">
          {kindEmoji[a.kind]}
        </span>
        <div className="min-w-0 flex-1">
          <p className="truncate font-medium">
            {a.name}
            {!a.is_active && (
              <span className="ml-2 rounded-full bg-muted px-2 py-0.5 text-xs text-muted-foreground">
                {s.inactive}
              </span>
            )}
          </p>
          {!compact && a.kind !== 'cash' && (
            <p className="truncate text-xs text-muted-foreground">
              <span className="money">{qty(a)}</span>
              {a.avg_cost_e6 !== null && (
                <> · {s.avgCost(formatMoney(Math.round(a.avg_cost_e6 / 10_000)))}</>
              )}
            </p>
          )}
          {a.kind !== 'cash' && (
            <p className="truncate text-xs text-muted-foreground">
              <RateLine rate={i.rate} today={today} />
            </p>
          )}
        </div>
        {!compact && (
          <div className="shrink-0 text-right">
            <p className="money font-semibold">{i.value === null ? '—' : formatMoney(i.value)}</p>
            {i.unrealized_pl !== null && a.quantity_e6 > 0 && a.kind !== 'cash' && (
              <p className="text-xs">
                <Pl pl={i.unrealized_pl} cost={a.cost} />
              </p>
            )}
          </div>
        )}
        <ChevronRight className="size-4 shrink-0 text-muted-foreground" aria-hidden />
      </Link>
    </li>
  )
}