"use client";

import { useEffect, useState } from "react";
import { useRouter } from "next/navigation";

import { MetricChip } from "@/components/ui/metric-chip";
import { PageHeader } from "@/components/ui/page-header";
import type { OrderSummaryVM } from "@/lib/types/view-models";
import {
  OrdersToolbar,
  type OrderFilterServiceMode,
  type OrderFilterStatus,
} from "@/features/orders/components/orders-toolbar";
import { OrdersTable } from "@/features/orders/components/orders-table";

type PaginationData = {
  page: number;
  limit: number;
  total: number;
  totalPages: number;
};

type OrdersHomeProps = {
  currentPage?: number;
  isLoadingRecent?: boolean;
  message?: string;
  onOpenOrder?: (orderId: string) => void;
  onOpenWorkflow?: (orderId: string) => void;
  onPageChange?: (page: number) => void;
  onQuerySubmit?: (query: string) => void;
  onStatusChange?: (status: OrderFilterStatus) => void;
  recentOrders: OrderSummaryVM[];
  selectedQuery?: string;
  selectedStatus?: OrderFilterStatus;
  totalPages?: number;
};

type OrdersOverviewEnvelope = {
  data?: {
    limit?: number;
    items?: OrderSummaryVM[];
    page?: number;
    total?: number;
    totalPages?: number;
  };
  message?: string;
};

const TITLE_MESSAGE = "最近订单已接入真实后端接口";
const DEFAULT_MESSAGE = "当前页面直接展示真实订单列表，支持关键词、状态和分页操作。";
const DEFAULT_PAGINATION: PaginationData = {
  page: 1,
  limit: 6,
  total: 0,
  totalPages: 0,
};

export function OrdersHome({
  currentPage = 1,
  isLoadingRecent = false,
  message = DEFAULT_MESSAGE,
  onOpenOrder,
  onOpenWorkflow,
  onPageChange,
  onQuerySubmit,
  onStatusChange,
  recentOrders,
  selectedQuery = "",
  selectedStatus = "all",
  totalPages = 0,
}: OrdersHomeProps) {
  const [queryValue, setQueryValue] = useState(selectedQuery);
  const [serviceModeFilter, setServiceModeFilter] =
    useState<OrderFilterServiceMode>("all");

  useEffect(() => {
    setQueryValue(selectedQuery);
  }, [selectedQuery]);

  const visibleOrders =
    serviceModeFilter === "all"
      ? recentOrders
      : recentOrders.filter((order) => order.serviceMode === serviceModeFilter);

  return (
    <section className="space-y-6">
      <PageHeader
        eyebrow="Orders home"
        title="订单总览"
        description="订单页直接承担扫描、筛选和跳转职责，不再把首屏浪费在入口说明和大卡片上。"
        meta="真实列表页"
      />

      <div className="flex flex-wrap gap-2">
        <MetricChip label="mode" value="真实订单列表" />
        <MetricChip label="rows" value={visibleOrders.length} />
        <MetricChip label="message" value={TITLE_MESSAGE} />
      </div>

      <p className="text-sm text-[var(--ink-muted)]">{message}</p>

      <OrdersToolbar
        currentPage={currentPage}
        query={queryValue}
        serviceMode={serviceModeFilter}
        status={selectedStatus}
        totalPages={totalPages}
        onPageChange={onPageChange}
        onQueryChange={setQueryValue}
        onQuerySubmit={onQuerySubmit}
        onServiceModeChange={setServiceModeFilter}
        onStatusChange={onStatusChange}
      />

      <OrdersTable
        isLoading={isLoadingRecent}
        items={visibleOrders}
        onOpenOrder={onOpenOrder}
        onOpenWorkflow={onOpenWorkflow}
      />
    </section>
  );
}

export function OrdersHomeScreen() {
  const router = useRouter();
  const [recentOrders, setRecentOrders] = useState<OrderSummaryVM[]>([]);
  const [message, setMessage] = useState(DEFAULT_MESSAGE);
  const [isLoadingRecent, setIsLoadingRecent] = useState(true);
  const [selectedQuery, setSelectedQuery] = useState("");
  const [selectedStatus, setSelectedStatus] =
    useState<OrderFilterStatus>("all");
  const [pagination, setPagination] = useState<PaginationData>(DEFAULT_PAGINATION);

  useEffect(() => {
    let active = true;

    async function loadRecentOrders() {
      setIsLoadingRecent(true);

      try {
        const params = new URLSearchParams({
          page: String(pagination.page),
          limit: String(pagination.limit),
        });

        if (selectedStatus !== "all") {
          params.set("status", selectedStatus);
        }

        if (selectedQuery.length > 0) {
          params.set("query", selectedQuery);
        }

        const response = await fetch(`/api/dashboard/orders-overview?${params.toString()}`);
        const payload = (await response.json()) as OrdersOverviewEnvelope;

        if (!active) {
          return;
        }

        setRecentOrders(payload.data?.items ?? []);
        setPagination((current) => ({
          page: payload.data?.page ?? current.page,
          limit: payload.data?.limit ?? current.limit,
          total: payload.data?.total ?? current.total,
          totalPages: payload.data?.totalPages ?? current.totalPages,
        }));
        setMessage(payload.message ?? DEFAULT_MESSAGE);
      } catch {
        if (!active) {
          return;
        }

        setRecentOrders([]);
        setPagination((current) => ({
          ...current,
          total: 0,
          totalPages: 0,
        }));
        setMessage("最近访问记录加载失败，请稍后重试。");
      } finally {
        if (active) {
          setIsLoadingRecent(false);
        }
      }
    }

    void loadRecentOrders();

    return () => {
      active = false;
    };
  }, [pagination.limit, pagination.page, selectedQuery, selectedStatus]);

  return (
    <OrdersHome
      currentPage={pagination.page}
      isLoadingRecent={isLoadingRecent}
      message={message}
      onPageChange={(page) =>
        setPagination((current) => ({
          ...current,
          page,
        }))
      }
      onQuerySubmit={(query) => {
        setSelectedQuery(query);
        setPagination((current) => ({
          ...current,
          page: 1,
        }));
      }}
      recentOrders={recentOrders}
      onStatusChange={(status) => {
        setSelectedStatus(status);
        setPagination((current) => ({
          ...current,
          page: 1,
        }));
      }}
      onOpenOrder={(orderId) => router.push(`/orders/${orderId}`)}
      onOpenWorkflow={(orderId) => router.push(`/workflows/${orderId}`)}
      selectedQuery={selectedQuery}
      selectedStatus={selectedStatus}
      totalPages={pagination.totalPages}
    />
  );
}