"use client";

import { PlusOutlined } from "@ant-design/icons";
import { List } from "@refinedev/antd";
import { Alert, App, Button, Card, Form, Input, InputNumber, Modal, Row, Col, Space, Switch, Table, Typography, type TableColumnsType } from "antd";
import { useCallback, useEffect, useState } from "react";

const { Text } = Typography;

type PaymentPackage = {
  id: string;
  name: string;
  description: string;
  priceCents: number;
  credits: number;
  sortOrder: number;
  enabled: boolean;
};

type PackageFormValues = Omit<PaymentPackage, "id" | "priceCents"> & { priceYuan: number };

function formatMoney(cents: number) {
  return `¥${(cents / 100).toFixed(2)}`;
}

async function responsePayload(response: Response) {
  const payload = await response.json().catch(() => ({}));
  if (!response.ok) throw new Error(payload.error || "请求失败");
  return payload;
}

export function PackageManagement() {
  const { message } = App.useApp();
  const [packageForm] = Form.useForm<PackageFormValues>();
  const [packages, setPackages] = useState<PaymentPackage[]>([]);
  const [packagesLoading, setPackagesLoading] = useState(true);
  const [packagesError, setPackagesError] = useState("");
  const [modalOpen, setModalOpen] = useState(false);
  const [editingPackage, setEditingPackage] = useState<PaymentPackage | null>(null);
  const [saving, setSaving] = useState(false);
  const [disablingId, setDisablingId] = useState<string | null>(null);

  const loadPackages = useCallback(async () => {
    setPackagesLoading(true);
    setPackagesError("");
    try {
      const payload = await responsePayload(await fetch("/api/admin/packages", { cache: "no-store" }));
      setPackages(payload.packages);
    } catch (error) {
      setPackagesError(error instanceof Error ? error.message : "读取套餐失败");
    } finally {
      setPackagesLoading(false);
    }
  }, []);

  useEffect(() => {
    const timer = window.setTimeout(() => void loadPackages(), 0);
    return () => window.clearTimeout(timer);
  }, [loadPackages]);

  function openCreateModal() {
    setEditingPackage(null);
    packageForm.setFieldsValue({ name: "", description: "", priceYuan: 1, credits: 10, sortOrder: 0, enabled: true });
    setModalOpen(true);
  }

  function openEditModal(item: PaymentPackage) {
    setEditingPackage(item);
    packageForm.setFieldsValue({
      name: item.name,
      description: item.description,
      priceYuan: item.priceCents / 100,
      credits: item.credits,
      sortOrder: item.sortOrder,
      enabled: item.enabled,
    });
    setModalOpen(true);
  }

  function closeModal() {
    if (saving) return;
    setModalOpen(false);
    setEditingPackage(null);
    packageForm.resetFields();
  }

  async function savePackage(values: PackageFormValues) {
    setSaving(true);
    try {
      await responsePayload(await fetch("/api/admin/packages", {
        method: editingPackage ? "PATCH" : "POST",
        headers: { "content-type": "application/json" },
        body: JSON.stringify({
          ...(editingPackage ? { id: editingPackage.id } : {}),
          name: values.name.trim(),
          description: values.description?.trim() ?? "",
          priceCents: Math.round(values.priceYuan * 100),
          credits: values.credits,
          sortOrder: values.sortOrder,
          enabled: values.enabled,
        }),
      }));
      message.success(editingPackage ? "套餐已更新" : "套餐已添加");
      setModalOpen(false);
      setEditingPackage(null);
      packageForm.resetFields();
      await loadPackages();
    } catch (error) {
      message.error(error instanceof Error ? error.message : "保存套餐失败");
    } finally {
      setSaving(false);
    }
  }

  async function disablePackage(id: string) {
    setDisablingId(id);
    try {
      await responsePayload(await fetch("/api/admin/packages", {
        method: "DELETE",
        headers: { "content-type": "application/json" },
        body: JSON.stringify({ id }),
      }));
      message.success("套餐已停用");
      await loadPackages();
    } catch (error) {
      message.error(error instanceof Error ? error.message : "停用套餐失败");
    } finally {
      setDisablingId(null);
    }
  }

  const columns: TableColumnsType<PaymentPackage> = [
    { title: "名称", dataIndex: "name", render: (_, item) => <Space direction="vertical" size={0}><Text strong>{item.name}</Text><Text type="secondary">{item.description || "暂无描述"}</Text></Space> },
    { title: "价格", dataIndex: "priceCents", align: "right", render: formatMoney },
    { title: "点数", dataIndex: "credits", align: "right" },
    { title: "排序", dataIndex: "sortOrder", align: "right" },
    { title: "状态", dataIndex: "enabled", render: (enabled) => <Text type={enabled ? undefined : "secondary"}>{enabled ? "启用" : "停用"}</Text> },
    { title: "操作", key: "actions", fixed: "right", render: (_, item) => <Space><Button type="link" onClick={() => openEditModal(item)}>编辑</Button>{item.enabled && <Button type="link" danger loading={disablingId === item.id} onClick={() => void disablePackage(item.id)}>停用</Button>}</Space> },
  ];

  return (
    <List title="套餐管理">
      <Card title="套餐设置" extra={<Button type="primary" icon={<PlusOutlined />} onClick={openCreateModal}>添加套餐</Button>}>
        <Space direction="vertical" size="middle" style={{ width: "100%" }}>
          {packagesError && <Alert type="error" showIcon message="套餐列表读取失败" description={packagesError} action={<Button size="small" onClick={() => void loadPackages()}>重试</Button>} />}
          <Table<PaymentPackage> rowKey="id" columns={columns} dataSource={packages} loading={packagesLoading} pagination={false} scroll={{ x: "max-content" }} />
        </Space>
      </Card>
      <Modal title={editingPackage ? "编辑套餐" : "添加套餐"} open={modalOpen} okText={editingPackage ? "保存修改" : "添加套餐"} cancelText="取消" confirmLoading={saving} onOk={() => packageForm.submit()} onCancel={closeModal} destroyOnHidden afterClose={() => packageForm.resetFields()} maskClosable={!saving} keyboard={!saving}>
        <Form<PackageFormValues> form={packageForm} layout="vertical" onFinish={savePackage} requiredMark="optional" initialValues={{ priceYuan: 1, credits: 10, sortOrder: 0, enabled: true }}>
          <Form.Item name="name" label="名称" rules={[{ required: true, message: "请输入套餐名称" }, { max: 80 }]}><Input autoFocus /></Form.Item>
          <Row gutter={16}>
            <Col span={12}><Form.Item name="priceYuan" label="价格（元）" extra="保存时转换为 API 的 priceCents" rules={[{ required: true, message: "请输入价格" }]}><InputNumber min={0.01} max={1_000_000} precision={2} step={1} style={{ width: "100%" }} prefix="¥" /></Form.Item></Col>
            <Col span={12}><Form.Item name="credits" label="点数" rules={[{ required: true, message: "请输入点数" }]}><InputNumber min={1} max={10_000_000} precision={0} style={{ width: "100%" }} /></Form.Item></Col>
          </Row>
          <Form.Item name="sortOrder" label="排序" rules={[{ required: true, message: "请输入排序" }]}><InputNumber min={-100_000} max={100_000} precision={0} style={{ width: "100%" }} /></Form.Item>
          <Form.Item name="description" label="描述" rules={[{ max: 500 }]}><Input.TextArea rows={3} showCount maxLength={500} /></Form.Item>
          <Form.Item name="enabled" label="启用" valuePropName="checked"><Switch checkedChildren="启用" unCheckedChildren="停用" /></Form.Item>
        </Form>
      </Modal>
    </List>
  );
}