"use client";

import {
  AlertTriangle,
  ChartColumn,
  ChevronRight,
  ClipboardCheck,
  Clock,
  FolderTree,
  Plus,
  Search,
  Tags,
} from "lucide-react";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { useMemo, useState, useTransition } from "react";
import { toast } from "sonner";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Checkbox } from "@/components/ui/checkbox";
import { Input } from "@/components/ui/input";
import { tr } from "@/i18n/tr";
import { cn } from "@/lib/utils";
import { formatDate } from "@/shared/format";
import { foldTr } from "@/shared/search";
import { formatStock, stepLabel, type ExpiringLot } from "@/shared/stock";
import { quickConsumeAction } from "../actions";
import type { ProductTypeView, StockOption, StockView as Data } from "../service";
import { ProductTypeFormDialog } from "./stock-dialogs";

const t = tr.stock;
export const ymdLabel = (ymd: string) => formatDate(`${ymd}T12:00:00+03:00`);

/** Mevcut/hedef çubuğu; eşik çizgiyle işaretli. */
export function StockBar({ item }: { item: ProductTypeView }) {
  const pct = Math.min(100, item.level.pct ?? 0);
  return (
    <div
      className="relative h-1.5 w-full overflow-hidden rounded-full bg-muted"
      role="progressbar"
      aria-label={t.list.of(
        formatStock(Math.max(0, item.current), item.unit),
        formatStock(item.targetQuantity, item.unit),
      )}
      aria-valuemin={0}
      aria-valuemax={100}
      aria-valuenow={pct}
    >
      <div
        className={cn("h-full rounded-full", item.level.low ? "bg-expense" : "bg-budget")}
        style={{ width: `${pct}%` }}
      />
      {item.thresholdPct > 0 && item.thresholdPct < 100 ? (
        <span
          aria-hidden
          className="absolute top-0 h-full w-0.5 bg-foreground/50"
          style={{ left: `${item.thresholdPct}%` }}
        />
      ) : null}
    </div>
  );
}

export function LevelBadge({ item }: { item: ProductTypeView }) {
  if (item.current <= 0 && item.targetQuantity > 0)
    return <Badge variant="destructive">{t.list.outBadge}</Badge>;
  if (item.level.low)
    return (
      <Badge variant="outline" className="gap-1 border-expense/50 text-expense">
        <AlertTriangle className="size-3" />
        {t.list.lowBadge}
      </Badge>
    );
  return null;
}

export function ExpiryBadge({ lot }: { lot: Pick<ExpiringLot, "expiryDate" | "status"> }) {
  return (
    <Badge
      variant="outline"
      className={cn(
        "gap-1",
        lot.status === "expired"
          ? "border-expense/50 text-expense"
          : "border-amber-500/50 text-amber-700 dark:text-amber-400",
      )}
    >
      <Clock className="size-3" />
      {t.expiring.on(ymdLabel(lot.expiryDate))}
    </Badge>
  );
}

/** "1 azalt" düğmesi. */
export function QuickConsumeButton({ item }: { item: ProductTypeView }) {
  const [pending, start] = useTransition();
  return (
    <Button
      size="sm"
      variant="outline"
      className="shrink-0 tabular-nums"
      disabled={pending || item.current <= 0}
      aria-label={t.list.quickConsume(item.name)}
      onClick={() =>
        start(async () => {
          const r = await quickConsumeAction(item.id);
          if (r.ok)
            toast.success(
              t.list.quickDone(
                item.name,
                formatStock((r.data as { remaining: number }).remaining, item.unit),
              ),
            );
          else toast.error(r.error);
        })
      }
    >
      {stepLabel(item.step, item.unit)}
    </Button>
  );
}

/** Önerilen miktarın gerekçesi: fire indirimi, tüketim hızı yuvarlaması, kaç gün yeter. */
export function suggestionReasons(item: ProductTypeView): string[] {
  const s = item.suggestion;
  if (s.quantity === 0) return [];
  const out: string[] = [];
  if (s.waste) out.push(t.suggestions.wasteReduced(s.waste.purchases, s.waste.pct));
  if (s.roundedByUsage) out.push(t.suggestions.roundedByUsage(formatStock(s.roundTo, item.unit)));
  if (s.coverDays !== null) out.push(t.suggestions.covers(s.coverDays));
  return out;
}

function Stat({ label, value, tone }: { label: string; value: number; tone?: string }) {
  return (
    <div className="min-w-0">
      <p className="text-xs text-muted-foreground">{label}</p>
      <p className={cn("text-lg font-semibold tabular-nums", value > 0 && tone)}>{value}</p>
    </div>
  );
}

/** /stok: özet, öneriler, SKT uyarıları ve kategoriye göre ürün listesi. */
export function StockView({ data, options }: { data: Data; options: StockOption[] }) {
  const router = useRouter();
  const [creating, setCreating] = useState(false);
  const [query, setQuery] = useState("");
  const [onlyLow, setOnlyLow] = useState(false);

  const expired = data.expiring.filter((e) => e.lot.status === "expired").length;
  const groups = useMemo(() => {
    const q = foldTr(query.trim());
    const match = (i: ProductTypeView) =>
      (!onlyLow || i.level.low) &&
      (!q || foldTr(i.name).includes(q) || foldTr(i.location).includes(q));
    return data.categories
      .map((c) => ({
        category: c,
        items: data.items.filter((i) => i.categoryId === c.id && match(i)),
      }))
      .filter((g) => g.items.length > 0);
  }, [data, query, onlyLow]);

  return (
    <div className="flex flex-col gap-4">
      <div className="flex flex-wrap justify-end gap-2">
        <Button variant="ghost" size="sm" asChild>
          <Link href="/stok/urunler">
            <Tags />
            {tr.products.catalogLink}
          </Link>
        </Button>
        <Button variant="ghost" size="sm" asChild>
          <Link href="/stok/analiz">
            <ChartColumn />
            {t.analysisLink}
          </Link>
        </Button>
        <Button variant="ghost" size="sm" asChild>
          <Link href="/stok/sayim">
            <ClipboardCheck />
            {t.countLink}
          </Link>
        </Button>
        <Button variant="ghost" size="sm" asChild>
          <Link href="/stok/kategoriler">
            <FolderTree />
            {t.categoriesLink}
          </Link>
        </Button>
        {data.canWrite ? (
          <Button size="sm" onClick={() => setCreating(true)}>
            <Plus />
            {t.newProduct}
          </Button>
        ) : null}
      </div>

      <Card size="sm">
        <CardContent className="grid grid-cols-2 gap-3 sm:grid-cols-4">
          <Stat label={t.summary.products} value={data.items.length} />
          <Stat label={t.summary.low} value={data.suggestions.length} tone="text-expense" />
          <Stat
            label={t.summary.expiring}
            value={data.expiring.length - expired}
            tone="text-amber-700 dark:text-amber-400"
          />
          <Stat label={t.summary.expired} value={expired} tone="text-expense" />
        </CardContent>
      </Card>

      <div className="grid gap-4 lg:grid-cols-2">
        <Card size="sm">
          <CardHeader>
            <CardTitle className="text-base">{t.suggestions.title}</CardTitle>
            <CardDescription>{t.suggestions.description}</CardDescription>
          </CardHeader>
          <CardContent className="flex flex-col gap-3">
            {data.suggestions.length ? (
              <Link href="/alisveris" className="text-sm text-primary hover:underline">
                {t.suggestions.toShopping}
              </Link>
            ) : null}
            {data.suggestions.length === 0 ? (
              <p className="text-sm text-muted-foreground">{t.suggestions.empty}</p>
            ) : (
              <ul className="divide-y text-sm">
                {data.suggestions.map((i) => {
                  const reasons = suggestionReasons(i);
                  return (
                    <li key={i.id} className="flex flex-col gap-0.5 py-2">
                      <div className="flex items-center justify-between gap-3">
                        <Link href={`/stok/${i.id}`} className="min-w-0 hover:underline">
                          <span className="block truncate font-medium">{i.name}</span>
                          <span className="block text-xs text-muted-foreground tabular-nums">
                            {t.list.of(
                              formatStock(Math.max(0, i.current), i.unit),
                              formatStock(i.targetQuantity, i.unit),
                            )}
                          </span>
                        </Link>
                        <span className="shrink-0 text-right font-medium tabular-nums">
                          {t.suggestions.suggested(formatStock(i.suggestedQuantity, i.unit))}
                        </span>
                      </div>
                      {reasons.length ? (
                        <p
                          className={cn(
                            "text-xs",
                            i.suggestion.waste
                              ? "text-amber-700 dark:text-amber-400"
                              : "text-muted-foreground",
                          )}
                        >
                          {reasons.join(" ")}
                        </p>
                      ) : null}
                    </li>
                  );
                })}
              </ul>
            )}
          </CardContent>
        </Card>
        {data.countDue.length ? (
          <Card size="sm">
            <CardHeader>
              <CardTitle className="text-base">{t.countDue.title}</CardTitle>
              <CardDescription>{t.countDue.description}</CardDescription>
            </CardHeader>
            <CardContent>
              <ul className="divide-y text-sm">
                {data.countDue.map((g) => (
                  <li key={g.categoryId} className="flex items-center justify-between gap-3 py-2">
                    <div className="min-w-0">
                      <span className="block truncate font-medium">{g.path}</span>
                      <span className="block text-xs text-muted-foreground">
                        {t.countDue.products(g.products)} ·{" "}
                        <span className="text-amber-700 dark:text-amber-400">
                          {t.countDue.overdue(g.overdueDays)}
                        </span>
                      </span>
                    </div>
                    {data.canWrite ? (
                      <Button size="sm" variant="outline" asChild>
                        <Link href={`/stok/sayim?kategori=${g.categoryId}`}>
                          <ClipboardCheck />
                          {t.countDue.start}
                        </Link>
                      </Button>
                    ) : null}
                  </li>
                ))}
              </ul>
            </CardContent>
          </Card>
        ) : null}
        {data.expiring.length ? (
          <Card size="sm">
            <CardHeader>
              <CardTitle className="text-base">{t.expiring.title}</CardTitle>
              <CardDescription>{t.expiring.description}</CardDescription>
            </CardHeader>
            <CardContent>
              <ul className="divide-y text-sm">
                {data.expiring.map(({ item, lot }) => (
                  <li
                    key={`${item.id}-${lot.index}`}
                    className="flex items-center justify-between gap-3 py-2"
                  >
                    <Link href={`/stok/${item.id}`} className="min-w-0 hover:underline">
                      <span className="block truncate font-medium">{item.name}</span>
                      <span className="block text-xs text-muted-foreground tabular-nums">
                        {formatStock(lot.remaining, item.unit)}
                      </span>
                    </Link>
                    <ExpiryBadge lot={lot} />
                  </li>
                ))}
              </ul>
            </CardContent>
          </Card>
        ) : null}
      </div>

      {data.items.length === 0 ? (
        <p className="rounded-lg border border-dashed p-6 text-center text-sm text-muted-foreground">
          {t.list.empty}
        </p>
      ) : (
        <>
          <div className="flex flex-wrap items-center gap-3">
            <div className="relative min-w-48 flex-1">
              <Search className="pointer-events-none absolute top-1/2 left-2.5 size-4 -translate-y-1/2 text-muted-foreground" />
              <Input
                value={query}
                onChange={(e) => setQuery(e.target.value)}
                placeholder={t.list.search}
                aria-label={t.list.search}
                className="pl-8"
              />
            </div>
            <label className="flex items-center gap-2 text-sm">
              <Checkbox checked={onlyLow} onCheckedChange={(x) => setOnlyLow(x === true)} />
              {t.list.onlyLow}
            </label>
          </div>
          {groups.length === 0 ? (
            <p className="text-sm text-muted-foreground">{t.list.noMatch}</p>
          ) : null}
          {groups.map(({ category, items }) => (
            <section key={category.id} className="flex flex-col gap-2">
              <h2 className="text-sm font-medium text-muted-foreground">{category.path}</h2>
              <ul className="flex flex-col gap-2">
                {items.map((item) => (
                  <StockRow key={item.id} item={item} canWrite={data.canWrite} />
                ))}
              </ul>
            </section>
          ))}
        </>
      )}

      {creating ? (
        <ProductTypeFormDialog
          item={null}
          categories={options}
          onClose={() => setCreating(false)}
          onCreated={(id) => router.push(`/stok/${id}`)}
        />
      ) : null}
    </div>
  );
}

function StockRow({ item, canWrite }: { item: ProductTypeView; canWrite: boolean }) {
  const lot = item.expiring[0];
  return (
    <li className="flex items-center gap-2 rounded-xl border bg-card p-3">
      <Link href={`/stok/${item.id}`} className="flex min-w-0 flex-1 items-center gap-3">
        <div className="flex min-w-0 flex-1 flex-col gap-1.5">
          <div className="flex items-center justify-between gap-2">
            <p className="flex min-w-0 flex-wrap items-center gap-1.5 font-medium">
              <span className="truncate">{item.name}</span>
              <LevelBadge item={item} />
              {lot ? <ExpiryBadge lot={lot} /> : null}
            </p>
            <span className="shrink-0 text-sm tabular-nums">
              <span className="font-semibold">
                {formatStock(Math.max(0, item.current), item.unit)}
              </span>
              <span className="text-muted-foreground">
                {" "}
                / {formatStock(item.targetQuantity, item.unit)}
              </span>
            </span>
          </div>
          <StockBar item={item} />
          {item.location ? (
            <p className="truncate text-xs text-muted-foreground">{item.location}</p>
          ) : null}
        </div>
        <ChevronRight className="size-4 shrink-0 text-muted-foreground" />
      </Link>
      {canWrite ? <QuickConsumeButton item={item} /> : null}
    </li>
  );
}