import { z } from "zod";
import { tr } from "../../i18n/tr";
import { parseMoney } from "../money";
import { parseQuantity } from "../quantity";

const s = tr.shopping.validation;
const id = z.string().regex(/^[a-f0-9]{24}$/i);
const optionalId = z
  .string()
  .regex(/^([a-f0-9]{24})?$/i)
  .transform((x) => (x === "" ? null : x));

/** Boş → null (1 paket / belirtilmemiş); dolu → binde bir pozitif tamsayı. */
const optionalQuantity = z.preprocess(
  (x) => (x === undefined || x === null || String(x).trim() === "" ? null : x),
  z
    .string()
    .trim()
    .transform((x, ctx) => {
      const q = parseQuantity(x);
      if (q === null || q <= 0) {
        ctx.addIssue({ code: "custom", message: s.quantity });
        return z.NEVER;
      }
      return q;
    })
    .nullable(),
);

export const shoppingListFormSchema = z.object({
  name: z.string().trim().min(1, tr.common.required).max(80, tr.validation.nameMax),
  note: z.string().trim().max(300).default(""),
});
export type ShoppingListFormInput = z.input<typeof shoppingListFormSchema>;
export type ShoppingListForm = z.output<typeof shoppingListFormSchema>;

/** Kalem: ürün tipi, belirli ürün (marka/paket) ya da serbest metin. */
export const shoppingItemFormSchema = z
  .object({
    kind: z.enum(["type", "product", "text"]),
    productTypeId: optionalId.default(""),
    productId: optionalId.default(""),
    text: z.string().trim().max(120).default(""),
    quantity: optionalQuantity.default(null),
    unit: z.string().trim().max(20).default(""),
    note: z.string().trim().max(200).default(""),
  })
  .superRefine((x, ctx) => {
    if (x.kind === "type" && !x.productTypeId)
      ctx.addIssue({ code: "custom", path: ["productTypeId"], message: s.productType });
    if (x.kind === "product" && !x.productId)
      ctx.addIssue({ code: "custom", path: ["productId"], message: s.product });
    if (x.kind === "text" && !x.text)
      ctx.addIssue({ code: "custom", path: ["text"], message: s.text });
  })
  .transform((x) => ({
    ...x,
    productTypeId: x.kind === "type" ? x.productTypeId : null,
    productId: x.kind === "product" ? x.productId : null,
    text: x.kind === "text" ? x.text : "",
    unit: x.kind === "text" ? x.unit : "",
  }));
export type ShoppingItemFormInput = z.input<typeof shoppingItemFormSchema>;
export type ShoppingItemForm = z.output<typeof shoppingItemFormSchema>;

/** Kalem düzenleme: miktar ve not (serbest metinde metin ve birim de). */
export const shoppingItemUpdateSchema = z.object({
  quantity: optionalQuantity.default(null),
  text: z.string().trim().max(120).default(""),
  unit: z.string().trim().max(20).default(""),
  note: z.string().trim().max(200).default(""),
});
export type ShoppingItemUpdate = z.output<typeof shoppingItemUpdateSchema>;

export const shoppingItemRefSchema = z.object({ listId: id, itemId: id });

const positiveQuantity = z
  .string()
  .trim()
  .transform((x, ctx) => {
    const q = parseQuantity(x);
    if (q === null || q <= 0) {
      ctx.addIssue({ code: "custom", message: s.quantity });
      return z.NEVER;
    }
    return q;
  });

const amount = z
  .string()
  .trim()
  .transform((x, ctx) => {
    const minor = parseMoney(x);
    if (minor === null || minor <= 0) {
      ctx.addIssue({ code: "custom", message: s.amount });
      return z.NEVER;
    }
    return minor;
  });

/**
 * Alışverişi tamamla. Satır: liste kalemi (itemId) ya da plansız ekstra (itemId boş). Ürün
 * kaleminde/ekstrada ürün zorunlu; serbest metin kaleminde ürün yok. Tutar satırın ödenen tutarı.
 */
export const shoppingCompletionSchema = z
  .object({
    date: z.string().regex(/^\d{4}-\d{2}-\d{2}$/, tr.validation.date),
    lines: z
      .array(
        z.object({
          itemId: optionalId.default(""),
          productId: optionalId.default(""),
          storeId: id,
          packages: positiveQuantity,
          amount,
        }),
      )
      .min(1, s.noLines)
      .max(200),
    stores: z
      .array(
        z.object({
          storeId: id,
          accountId: z.string().regex(/^[a-f0-9]{24}$/i, s.account),
          attachmentIds: z.array(id).max(10).default([]),
        }),
      )
      .max(10),
    /** Gider kategorisine eşlenmemiş stok kategorilerindeki kalemler için. */
    fallbackCategoryId: optionalId.default(""),
    leftover: z.object({
      action: z.enum(["move", "new", "drop"]),
      targetListId: optionalId.default(""),
      newListName: z.string().trim().max(80).default(""),
    }),
  })
  .superRefine((x, ctx) => {
    const items = x.lines.map((l) => l.itemId).filter(Boolean);
    if (new Set(items).size !== items.length)
      ctx.addIssue({ code: "custom", path: ["lines"], message: s.duplicateLine });
    x.lines.forEach((l, i) => {
      if (!l.itemId && !l.productId)
        ctx.addIssue({ code: "custom", path: ["lines", i, "productId"], message: s.product });
    });
    const stores = new Set(x.stores.map((st) => st.storeId));
    if (stores.size !== x.stores.length)
      ctx.addIssue({ code: "custom", path: ["stores"], message: s.duplicateStore });
    for (const l of x.lines)
      if (!stores.has(l.storeId)) {
        ctx.addIssue({ code: "custom", path: ["stores"], message: s.account });
        break;
      }
    if (x.leftover.action === "move" && !x.leftover.targetListId)
      ctx.addIssue({ code: "custom", path: ["leftover", "targetListId"], message: s.targetList });
    if (x.leftover.action === "new" && !x.leftover.newListName)
      ctx.addIssue({
        code: "custom",
        path: ["leftover", "newListName"],
        message: tr.common.required,
      });
  });
export type ShoppingCompletionInput = z.input<typeof shoppingCompletionSchema>;
export type ShoppingCompletionForm = z.output<typeof shoppingCompletionSchema>;