"use client";

import { ArrowLeft, Check, ClipboardCheck, Globe } from "lucide-react";
import Link from "next/link";
import { startTransition, useOptimistic } from "react";
import { toast } from "sonner";
import { Button } from "@/components/ui/button";
import { StoreDot } from "@/features/prices/components/offers-list";
import { useAutoRefresh } from "@/hooks/use-auto-refresh";
import { tr } from "@/i18n/tr";
import { cn } from "@/lib/utils";
import { formatMoney } from "@/shared/format";
import { formatQuantity } from "@/shared/quantity";
import { SHOPPING_REFRESH_MS } from "@/shared/shopping";
import type { PlanLine } from "@/shared/shopping-plan";
import { setShoppingItemCheckedAction } from "../actions";
import type { ShoppingItemView, ShoppingListDetail } from "../service";
import { planHeadline, type PlanChoice } from "./plan-panel";

const t = tr.shopping;
const m = t.mode;

type Group = {
  key: string;
  title: string;
  slot: number | null;
  online: boolean;
  hint?: string;
  rows: { item: ShoppingItemView; line: PlanLine | null }[];
};

function Row({
  item,
  line,
  product,
  canWrite,
  onToggle,
}: {
  item: ShoppingItemView;
  line: PlanLine | null;
  product: { label: string; packageLabel: string } | undefined;
  canWrite: boolean;
  onToggle: () => void;
}) {
  const sub = [
    line
      ? line.packages > 1
        ? t.plan.line(formatQuantity(line.packages * 1000), formatMoney(line.priceMinor))
        : formatMoney(line.priceMinor)
      : null,
    line && product && item.kind === "type" ? `${product.label} · ${product.packageLabel}` : null,
    item.note || null,
  ].filter(Boolean);
  return (
    <li>
      <button
        type="button"
        role="checkbox"
        aria-checked={item.checked}
        aria-label={m.check(item.label)}
        disabled={!canWrite}
        onClick={onToggle}
        className={cn(
          "flex min-h-16 w-full items-center gap-4 px-4 py-3 text-left transition-colors hover:bg-accent/40 focus-visible:bg-accent/40 focus-visible:outline-none disabled:cursor-default",
          item.checked && "bg-muted/40",
        )}
      >
        <span
          aria-hidden
          className={cn(
            "flex size-7 shrink-0 items-center justify-center rounded-md border-2",
            item.checked ? "border-income bg-income text-white" : "border-muted-foreground/40",
          )}
        >
          {item.checked ? <Check className="size-4.5" strokeWidth={3} /> : null}
        </span>
        <span className="min-w-0 flex-1">
          <span
            className={cn(
              "block text-base font-medium",
              item.checked && "text-muted-foreground line-through",
            )}
          >
            {item.label}
          </span>
          {sub.length ? (
            <span className="line-clamp-2 text-sm text-muted-foreground">{sub.join(" · ")}</span>
          ) : null}
        </span>
        <span className="shrink-0 text-base tabular-nums">{item.quantityLabel}</span>
      </button>
    </li>
  );
}

/** /alisveris/:id/mod — mağazaya göre gruplanmış, büyük dokunma alanlı kontrol listesi. */
export function ShoppingModeView({
  data,
  choice,
}: {
  data: ShoppingListDetail;
  choice: PlanChoice;
}) {
  useAutoRefresh(SHOPPING_REFRESH_MS);
  const { list, plan, canWrite } = data;
  const [items, setOptimistic] = useOptimistic(
    data.items,
    (state, change: { id: string; checked: boolean }) =>
      state.map((i) => (i.id === change.id ? { ...i, checked: change.checked } : i)),
  );
  const option = (choice === "single" ? plan.single : null) ?? plan.recommended;
  const byId = new Map(items.map((i) => [i.id, i]));

  const groups: Group[] = [];
  const placed = new Set<string>();
  for (const g of option?.stores ?? []) {
    const store = plan.stores[g.storeId];
    const rows = g.lines.flatMap((line) => {
      const item = byId.get(line.itemId);
      if (!item) return [];
      placed.add(item.id);
      return [{ item, line }];
    });
    groups.push({
      key: g.storeId,
      title: store?.label ?? "—",
      slot: store?.slot ?? null,
      online: store?.kind === "online",
      rows,
    });
  }
  const rest = items.filter((i) => !placed.has(i.id));
  if (rest.length)
    groups.push({
      key: "other",
      title: m.other,
      slot: null,
      online: false,
      hint: m.otherHint,
      rows: rest.map((item) => ({ item, line: null })),
    });

  const done = items.filter((i) => i.checked).length;
  const pct = items.length ? Math.round((done / items.length) * 100) : 0;

  function toggle(item: ShoppingItemView) {
    const checked = !item.checked;
    startTransition(async () => {
      setOptimistic({ id: item.id, checked });
      const r = await setShoppingItemCheckedAction(list.id, item.id, checked);
      if (!r.ok) toast.error(r.error);
    });
  }

  const headline = planHeadline(plan);
  const differs =
    plan.single &&
    plan.single.stores.map((s) => s.storeId).join() !==
      plan.recommended?.stores.map((s) => s.storeId).join();

  return (
    <div className="mx-auto flex w-full max-w-2xl flex-col gap-4">
      <Button variant="ghost" size="sm" asChild className="-ml-2 w-fit">
        <Link href={`/alisveris/${list.id}`}>
          <ArrowLeft />
          {t.actions.backToList}
        </Link>
      </Button>
      <div className="flex flex-col gap-2">
        <h1 className="text-xl font-semibold">
          {m.title}: {list.name}
        </h1>
        {headline ? <p className="text-sm text-muted-foreground">{headline}</p> : null}
        {differs ? (
          <nav aria-label={m.planChoice} className="flex gap-2">
            {(["recommended", "single"] as const).map((c) => (
              <Button
                key={c}
                size="sm"
                variant={c === choice ? "secondary" : "ghost"}
                asChild
                aria-current={c === choice ? "page" : undefined}
              >
                <Link href={c === "single" ? "?plan=single" : "?"} replace scroll={false}>
                  {c === "single" ? t.plan.single : t.plan.recommended}
                </Link>
              </Button>
            ))}
          </nav>
        ) : null}
      </div>

      <div className="sticky top-14 z-10 -mx-4 bg-background/95 px-4 py-2 backdrop-blur">
        <div className="flex items-center justify-between text-sm">
          <span className="font-medium tabular-nums">{m.progress(done, items.length)}</span>
          {done === items.length && items.length ? (
            <span className="text-income">{m.allDone}</span>
          ) : null}
        </div>
        <div
          className="mt-1.5 h-2 overflow-hidden rounded-full bg-muted"
          role="progressbar"
          aria-valuemin={0}
          aria-valuemax={items.length}
          aria-valuenow={done}
          aria-label={m.progress(done, items.length)}
        >
          <div
            className="h-full rounded-full bg-income transition-all"
            style={{ width: `${pct}%` }}
          />
        </div>
      </div>

      {groups.map((g) => {
        const groupDone = g.rows.filter((r) => r.item.checked).length;
        return (
          <section key={g.key} className="overflow-hidden rounded-xl border bg-card">
            <header className="flex items-center gap-2 border-b bg-muted/40 px-4 py-2.5">
              <h2 className="flex min-w-0 items-center font-medium">
                {g.slot ? <StoreDot slot={g.slot} /> : null}
                <span className="truncate">{g.title}</span>
                {g.online ? (
                  <Globe className="ml-1.5 size-3.5 text-muted-foreground" aria-hidden />
                ) : null}
              </h2>
              <span className="ml-auto text-sm text-muted-foreground tabular-nums">
                {groupDone}/{g.rows.length}
              </span>
            </header>
            {g.hint ? <p className="px-4 pt-2 text-xs text-muted-foreground">{g.hint}</p> : null}
            <ul className="divide-y">
              {g.rows.map(({ item, line }) => (
                <Row
                  key={item.id}
                  item={item}
                  line={line}
                  product={line ? plan.products[line.productId] : undefined}
                  canWrite={canWrite}
                  onToggle={() => toggle(item)}
                />
              ))}
            </ul>
          </section>
        );
      })}
      {canWrite && done > 0 ? (
        <Button asChild size="lg" className="w-full">
          <Link href={`/alisveris/${list.id}/tamamla`}>
            <ClipboardCheck />
            {t.complete.action}
          </Link>
        </Button>
      ) : null}
    </div>
  );
}