import { useMemo, useState } from "react"
import { useNavigate } from "react-router-dom"
import { Pin, RefreshCw } from "lucide-react"

import { Button } from "@/components/ui-pp/Button"
import { GlassCard } from "@/components/ui-pp/GlassCard"
import { t, tr, ui } from "@/i18n/ui"
import { useLanguage } from "@/lib/language"
import { cx } from "@/lib/cx"
import { buildSuggestion, reshuffleSuggestion } from "@/lib/suggestion"
import { formatClock, getTimeContext } from "@/lib/timeContext"
import type { FoodItem, Recipe, TimeSlot } from "@/types/domain"

const CAT_DOT: Record<string, string> = {
  protein: "var(--color-protein)",
  obst: "var(--color-obstgem)",
  gemuese: "var(--color-obstgem)",
  fett: "var(--color-fett)",
  kh: "var(--color-kh)",
  snack: "var(--color-protein)",
}

function slotLabel(slot: TimeSlot, lang: "de" | "en"): string {
  return t(ui.suggestion[slot], lang)
}

export function SuggestionCard() {
  const { lang } = useLanguage()
  const navigate = useNavigate()
  const context = useMemo(() => getTimeContext(), [])

  const [suggestion, setSuggestion] = useState(() => buildSuggestion(context.slot))
  const [pinnedIds, setPinnedIds] = useState<Set<string>>(() => new Set())

  const recipe: Recipe | null = suggestion.recipe
  const items: FoodItem[] = suggestion.foods

  const clock = formatClock(context.hour, context.minute, lang)
  const header =
    lang === "de"
      ? `${clock} ${t(ui.suggestion.timeSuffix, lang)} · ${slotLabel(context.slot, lang)}`
      : `${clock} · ${slotLabel(context.slot, lang)}`

  const title = recipe ? tr(recipe.name, lang) : t(ui.suggestion.fallbackName, lang)

  function togglePin(id: string) {
    setPinnedIds((current) => {
      const next = new Set(current)
      if (next.has(id)) next.delete(id)
      else next.add(id)
      return next
    })
  }

  function reroll() {
    if (pinnedIds.size === 0) {
      setSuggestion(buildSuggestion(context.slot, recipe?.id))
      return
    }
    setSuggestion({
      recipe: null,
      foods: reshuffleSuggestion(items, pinnedIds, context.slot),
    })
  }

  function sendToBuilder() {
    navigate("/builder", {
      state: {
        ingredientIds: items.map((item) => item.id),
        source: "suggestion" as const,
      },
    })
  }

  return (
    <GlassCard className="p-4">
      <div className="flex flex-col gap-4">
        <div className="flex flex-col gap-1">
          <p className="type-label text-[var(--ink-faint)]">{header}</p>
          <h2 className="type-title text-[var(--ink)]">{title}</h2>
        </div>

        <div className="flex flex-wrap gap-2">
          {items.map((item) => {
            const pinned = pinnedIds.has(item.id)
            return (
              <button
                key={item.id}
                type="button"
                onClick={() => togglePin(item.id)}
                aria-pressed={pinned}
                aria-label={`${tr(item.name, lang)} — ${pinned ? t(ui.suggestion.unpin, lang) : t(ui.suggestion.pin, lang)}`}
                className={cx(
                  "elevation-transition inline-flex min-h-[48px] items-center gap-2 rounded-[var(--radius-pill)] px-3",
                  "type-body-emphasis text-[var(--ink)]",
                  "ring-1 ring-[var(--border)]",
                  "active:translate-y-px active:brightness-95",
                  pinned && "ring-2 ring-[var(--color-pick)]/50",
                )}
                style={{ background: "var(--glass-fill)" }}
              >
                <span
                  aria-hidden
                  className="h-2.5 w-2.5 rounded-full"
                  style={{ background: CAT_DOT[item.cat] ?? "var(--ink-faint)" }}
                />
                <span>{tr(item.name, lang)}</span>
                {pinned ? (
                  <Pin className="h-3.5 w-3.5 text-[var(--color-pick)]" aria-hidden />
                ) : null}
              </button>
            )
          })}
        </div>

        <div className="flex flex-col gap-2 sm:flex-row">
          <Button variant="secondary" className="flex-1" onClick={reroll}>
            <RefreshCw className="h-4 w-4" aria-hidden />
            {t(ui.suggestion.reroll, lang)}
          </Button>
          <Button className="flex-1" onClick={sendToBuilder}>
            {t(ui.suggestion.toBuilder, lang)}
          </Button>
        </div>
      </div>
    </GlassCard>
  )
}