"use client";

import MoneyValues from "@/components/money-values";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { CATEGORY_TYPE_LABEL } from "@/lib/categorias/constants";
import type { PurchasesByCategoryData } from "@/lib/dashboard/purchases-by-category";
import { RiArrowDownLine, RiStore3Line } from "@remixicon/react";
import Image from "next/image";
import { useEffect, useMemo, useState } from "react";
import { WidgetEmptyState } from "../widget-empty-state";

type PurchasesByCategoryWidgetProps = {
  data: PurchasesByCategoryData;
};

const resolveLogoPath = (logo: string | null) => {
  if (!logo) {
    return null;
  }
  if (/^(https?:\/\/|data:)/.test(logo)) {
    return logo;
  }
  return logo.startsWith("/") ? logo : `/logos/${logo}`;
};

const buildInitials = (value: string) => {
  const parts = value.trim().split(/\s+/).filter(Boolean);
  if (parts.length === 0) {
    return "LC";
  }
  if (parts.length === 1) {
    const firstPart = parts[0];
    return firstPart ? firstPart.slice(0, 2).toUpperCase() : "LC";
  }
  const firstChar = parts[0]?.[0] ?? "";
  const secondChar = parts[1]?.[0] ?? "";
  return `${firstChar}${secondChar}`.toUpperCase() || "LC";
};

const formatTransactionDate = (date: Date) => {
  const formatter = new Intl.DateTimeFormat("pt-BR", {
    weekday: "short",
    day: "2-digit",
    month: "short",
    timeZone: "UTC",
  });

  const formatted = formatter.format(date);
  // Capitaliza a primeira letra do dia da semana
  return formatted.charAt(0).toUpperCase() + formatted.slice(1);
};

const STORAGE_KEY = "purchases-by-category-selected";

export function PurchasesByCategoryWidget({
  data,
}: PurchasesByCategoryWidgetProps) {
  // Inicializa com a categoria salva ou a primeira disponível
  const [selectedCategoryId, setSelectedCategoryId] = useState<string>(() => {
    if (typeof window === "undefined") {
      const firstCategory = data.categories[0];
      return firstCategory ? firstCategory.id : "";
    }

    const saved = sessionStorage.getItem(STORAGE_KEY);
    if (saved && data.categories.some((cat) => cat.id === saved)) {
      return saved;
    }

    const firstCategory = data.categories[0];
    return firstCategory ? firstCategory.id : "";
  });

  // Agrupa categorias por tipo
  const categoriesByType = useMemo(() => {
    const grouped: Record<string, typeof data.categories> = {};

    for (const category of data.categories) {
      if (!grouped[category.type]) {
        grouped[category.type] = [];
      }
      const typeGroup = grouped[category.type];
      if (typeGroup) {
        typeGroup.push(category);
      }
    }

    return grouped;
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [data.categories]);

  // Salva a categoria selecionada quando mudar
  useEffect(() => {
    if (selectedCategoryId) {
      sessionStorage.setItem(STORAGE_KEY, selectedCategoryId);
    }
  }, [selectedCategoryId]);

  // Atualiza a categoria selecionada se ela não existir mais na lista
  useEffect(() => {
    if (
      selectedCategoryId &&
      !data.categories.some((cat) => cat.id === selectedCategoryId)
    ) {
      const firstCategory = data.categories[0];
      if (firstCategory) {
        setSelectedCategoryId(firstCategory.id);
      } else {
        setSelectedCategoryId("");
      }
    }
  }, [data.categories, selectedCategoryId]);

  const currentTransactions = useMemo(() => {
    if (!selectedCategoryId) {
      return [];
    }
    return data.transactionsByCategory[selectedCategoryId] ?? [];
  }, [selectedCategoryId, data.transactionsByCategory]);

  const selectedCategory = useMemo(() => {
    return data.categories.find((cat) => cat.id === selectedCategoryId);
  }, [data.categories, selectedCategoryId]);

  if (data.categories.length === 0) {
    return (
      <WidgetEmptyState
        icon={<RiStore3Line className="size-6 text-muted-foreground" />}
        title="Nenhuma categoria encontrada"
        description="Crie categorias de despesas ou receitas para visualizar as compras."
      />
    );
  }

  return (
    <div className="flex flex-col gap-4 px-0">
      <div className="flex items-center gap-3">
        <Select
          value={selectedCategoryId}
          onValueChange={setSelectedCategoryId}
        >
          <SelectTrigger className="w-full">
            <SelectValue placeholder="Selecione uma categoria" />
          </SelectTrigger>
          <SelectContent>
            {Object.entries(categoriesByType).map(([type, categories]) => (
              <div key={type}>
                <div className="px-2 py-1.5 text-xs font-semibold text-muted-foreground">
                  {CATEGORY_TYPE_LABEL[
                    type as keyof typeof CATEGORY_TYPE_LABEL
                  ] ?? type}
                </div>
                {categories.map((category) => (
                  <SelectItem key={category.id} value={category.id}>
                    {category.name}
                  </SelectItem>
                ))}
              </div>
            ))}
          </SelectContent>
        </Select>
      </div>

      {currentTransactions.length === 0 ? (
        <WidgetEmptyState
          icon={<RiArrowDownLine className="size-6 text-muted-foreground" />}
          title="Nenhuma compra encontrada"
          description={
            selectedCategory
              ? `Não há lançamentos na categoria "${selectedCategory.name}".`
              : "Selecione uma categoria para visualizar as compras."
          }
        />
      ) : (
        <ul className="flex flex-col">
          {currentTransactions.map((transaction) => {
            const logo = resolveLogoPath(transaction.logo);
            const initials = buildInitials(transaction.name);

            return (
              <li
                key={transaction.id}
                className="flex items-center justify-between gap-3 border-b border-dashed py-2 last:border-b-0 last:pb-0"
              >
                <div className="flex min-w-0 flex-1 items-center gap-3">
                  <div className="flex size-10 shrink-0 items-center justify-center overflow-hidden rounded-lg bg-muted">
                    {logo ? (
                      <Image
                        src={logo}
                        alt={`Logo de ${transaction.name}`}
                        width={48}
                        height={48}
                        className="h-full w-full object-contain"
                      />
                    ) : (
                      <span className="text-sm font-semibold uppercase text-muted-foreground">
                        {initials}
                      </span>
                    )}
                  </div>

                  <div className="min-w-0">
                    <p className="truncate text-sm font-medium text-foreground">
                      {transaction.name}
                    </p>
                    <p className="text-xs text-muted-foreground">
                      {formatTransactionDate(transaction.purchaseDate)}
                    </p>
                  </div>
                </div>

                <div className="shrink-0 text-foreground">
                  <MoneyValues amount={transaction.amount} />
                </div>
              </li>
            );
          })}
        </ul>
      )}
    </div>
  );
}