"use client";

import { useState } from "react";
import { toast } from "sonner";
import { ResponsiveDialog } from "@/components/responsive-dialog";
import { Button } from "@/components/ui/button";
import { Field, FieldDescription, FieldError, FieldGroup, FieldLabel } from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectLabel,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Tabs, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { tr } from "@/i18n/tr";
import { SHOPPING_ITEM_KINDS, type ShoppingItemKind } from "@/shared/shopping";
import { quantityInput } from "@/shared/stock";
import { addShoppingItemAction, updateShoppingItemAction } from "../actions";
import type { ItemOptions, ShoppingItemView } from "../service";

const t = tr.shopping;
const f = t.fields;
type Errors = Record<string, string | undefined>;

/** Kalem ekle (ürün tipi / belirli marka / serbest metin) ya da düzenle (miktar, not). */
export function ShoppingItemDialog({
  listId,
  item,
  options,
  onClose,
}: {
  listId: string;
  item: ShoppingItemView | null;
  options: ItemOptions;
  onClose: () => void;
}) {
  const [v, setV] = useState({
    kind: (item?.kind ?? "type") as ShoppingItemKind,
    productTypeId: item?.productTypeId ?? "",
    productId: item?.productId ?? "",
    text: item?.text ?? "",
    quantity: item?.quantity != null ? quantityInput(item.quantity) : "",
    unit: item?.kind === "text" ? item.unit : "",
    note: item?.note ?? "",
  });
  const [errors, setErrors] = useState<Errors>({});
  const [busy, setBusy] = useState(false);
  const set = <K extends keyof typeof v>(k: K, x: (typeof v)[K]) => setV((s) => ({ ...s, [k]: x }));

  const typeUnit = options.types.find((x) => x.id === v.productTypeId)?.unit ?? "";
  const unitSuffix =
    v.kind === "type" ? (item?.unit ?? typeUnit) : v.kind === "product" ? t.packageUnit : "";
  const productGroups = new Map<string, ItemOptions["products"]>();
  for (const p of options.products)
    productGroups.set(p.typeName, [...(productGroups.get(p.typeName) ?? []), p]);

  async function submit(e: React.FormEvent) {
    e.preventDefault();
    setBusy(true);
    const r = item
      ? await updateShoppingItemAction(listId, item.id, {
          quantity: v.quantity,
          text: v.text,
          unit: v.unit,
          note: v.note,
        })
      : await addShoppingItemAction(listId, v);
    setBusy(false);
    if (r.ok) {
      toast.success(item ? t.toast.itemSaved : t.toast.itemAdded);
      onClose();
    } else setErrors({ ...r.fieldErrors, root: r.fieldErrors ? undefined : r.error });
  }

  return (
    <ResponsiveDialog
      open
      onOpenChange={(o) => !o && onClose()}
      title={item ? t.editItemTitle : t.addItemTitle}
      description={item && item.kind !== "text" ? item.label : undefined}
      footer={
        <>
          <Button variant="outline" type="button" onClick={onClose}>
            {tr.common.cancel}
          </Button>
          <Button type="submit" form="shopping-item-form" disabled={busy}>
            {tr.common.save}
          </Button>
        </>
      }
    >
      <form id="shopping-item-form" onSubmit={submit} noValidate>
        <FieldGroup>
          {item ? null : (
            <Field>
              <FieldLabel>{f.kind}</FieldLabel>
              <Tabs value={v.kind} onValueChange={(x) => set("kind", x as ShoppingItemKind)}>
                <TabsList className="w-full">
                  {SHOPPING_ITEM_KINDS.map((k) => (
                    <TabsTrigger key={k} value={k}>
                      {t.kinds[k]}
                    </TabsTrigger>
                  ))}
                </TabsList>
              </Tabs>
              <FieldDescription>{t.kindHints[v.kind]}</FieldDescription>
            </Field>
          )}
          {!item && v.kind === "type" ? (
            <Field data-invalid={Boolean(errors.productTypeId)}>
              <FieldLabel htmlFor="si-type">{f.productType}</FieldLabel>
              <Select value={v.productTypeId} onValueChange={(x) => set("productTypeId", x)}>
                <SelectTrigger
                  id="si-type"
                  className="w-full"
                  aria-invalid={Boolean(errors.productTypeId)}
                >
                  <SelectValue placeholder={t.validation.productType} />
                </SelectTrigger>
                <SelectContent className="max-h-72">
                  {options.types.map((x) => (
                    <SelectItem key={x.id} value={x.id}>
                      {x.name} <span className="text-xs text-muted-foreground">({x.unit})</span>
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
              {errors.productTypeId ? <FieldError>{errors.productTypeId}</FieldError> : null}
            </Field>
          ) : null}
          {!item && v.kind === "product" ? (
            <Field data-invalid={Boolean(errors.productId)}>
              <FieldLabel htmlFor="si-product">{f.product}</FieldLabel>
              <Select value={v.productId} onValueChange={(x) => set("productId", x)}>
                <SelectTrigger
                  id="si-product"
                  className="w-full"
                  aria-invalid={Boolean(errors.productId)}
                >
                  <SelectValue placeholder={t.validation.product} />
                </SelectTrigger>
                <SelectContent className="max-h-72">
                  {[...productGroups.entries()].map(([group, rows]) => (
                    <SelectGroup key={group}>
                      <SelectLabel>{group}</SelectLabel>
                      {rows.map((p) => (
                        <SelectItem key={p.id} value={p.id}>
                          {p.label}{" "}
                          <span className="text-xs text-muted-foreground">({p.packageLabel})</span>
                        </SelectItem>
                      ))}
                    </SelectGroup>
                  ))}
                </SelectContent>
              </Select>
              {errors.productId ? <FieldError>{errors.productId}</FieldError> : null}
            </Field>
          ) : null}
          {v.kind === "text" ? (
            <Field data-invalid={Boolean(errors.text)}>
              <FieldLabel htmlFor="si-text">{f.text}</FieldLabel>
              <Input
                id="si-text"
                value={v.text}
                placeholder={f.textPlaceholder}
                onChange={(e) => set("text", e.target.value)}
                aria-invalid={Boolean(errors.text)}
                autoFocus={!item}
              />
              {errors.text ? <FieldError>{errors.text}</FieldError> : null}
            </Field>
          ) : null}
          <div className="grid grid-cols-2 gap-3">
            <Field data-invalid={Boolean(errors.quantity)}>
              <FieldLabel htmlFor="si-qty">
                {v.kind === "product" ? f.packages : f.quantity}
                {unitSuffix ? ` (${unitSuffix})` : ""}
              </FieldLabel>
              <Input
                id="si-qty"
                inputMode="decimal"
                value={v.quantity}
                onChange={(e) => set("quantity", e.target.value)}
                className="text-right tabular-nums"
                aria-invalid={Boolean(errors.quantity)}
              />
              {errors.quantity ? <FieldError>{errors.quantity}</FieldError> : null}
            </Field>
            {v.kind === "text" ? (
              <Field>
                <FieldLabel htmlFor="si-unit">{f.unit}</FieldLabel>
                <Input
                  id="si-unit"
                  value={v.unit}
                  placeholder={f.unitPlaceholder}
                  onChange={(e) => set("unit", e.target.value)}
                />
              </Field>
            ) : null}
          </div>
          {v.kind !== "text" ? (
            <FieldDescription className="-mt-2">{f.quantityHint}</FieldDescription>
          ) : null}
          <Field>
            <FieldLabel htmlFor="si-note">{f.itemNote}</FieldLabel>
            <Input
              id="si-note"
              value={v.note}
              placeholder={f.itemNotePlaceholder}
              onChange={(e) => set("note", e.target.value)}
            />
          </Field>
          {errors.root ? <FieldError>{errors.root}</FieldError> : null}
        </FieldGroup>
      </form>
    </ResponsiveDialog>
  );
}