import { useCallback, useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import {
  Typography,
  Button,
  Table,
  Popconfirm,
  message,
  Card,
  Modal,
  Form,
  Input,
  Space,
} from "antd";
import type { TableProps } from "antd";
import {
  PlusOutlined,
  EditOutlined,
  DeleteOutlined,
  ReloadOutlined,
  SearchOutlined,
} from "@ant-design/icons";
import type { ConfigForm, ConfigItem } from "@/api/config";
import {
  addConfig,
  deleteConfig,
  getConfig,
  getConfigPage,
  updateConfig,
} from "@/api/config";

const { Title, Text } = Typography;
const { TextArea } = Input;

export function ConfigPage() {
  const { t } = useTranslation();
  const [data, setData] = useState<ConfigItem[]>([]);
  const [loading, setLoading] = useState(false);
  const [submitting, setSubmitting] = useState(false);
  const [modalOpen, setModalOpen] = useState(false);
  const [editingKey, setEditingKey] = useState<string | null>(null);
  const [total, setTotal] = useState(0);
  const [keyword, setKeyword] = useState("");
  const [query, setQuery] = useState({ page: 1, size: 10, keyword: undefined as string | undefined });
  const [form] = Form.useForm<ConfigForm>();

  const fetchData = useCallback(async () => {
    setLoading(true);
    try {
      const res = await getConfigPage(query);
      setData(res.records);
      setTotal(res.total);
    } catch {
      // handled by request util
    } finally {
      setLoading(false);
    }
  }, [query]);

  useEffect(() => {
    fetchData();
  }, [fetchData]);

  function handleSearch() {
    setQuery((prev) => ({
      ...prev,
      page: 1,
      keyword: keyword.trim() || undefined,
    }));
  }

  function handleReset() {
    setKeyword("");
    setQuery({ page: 1, size: 10, keyword: undefined });
  }

  function openAdd() {
    setEditingKey(null);
    form.resetFields();
    setModalOpen(true);
  }

  async function openEdit(record: ConfigItem) {
    setEditingKey(record.configKey);
    setModalOpen(true);
    try {
      const detail = await getConfig(record.configKey);
      form.setFieldsValue({
        configKey: detail.configKey,
        configValue: detail.configValue,
        remark: detail.remark,
      });
    } catch {
      setModalOpen(false);
      setEditingKey(null);
      message.error(t("config.fetchFailed"));
    }
  }

  async function handleSubmit() {
    try {
      const values = await form.validateFields();
      setSubmitting(true);
      if (editingKey) {
        await updateConfig(values);
        message.success(t("config.updateSuccess"));
      } else {
        await addConfig(values);
        message.success(t("config.addSuccess"));
      }
      setModalOpen(false);
      setEditingKey(null);
      form.resetFields();
      fetchData();
    } catch {
      // validation or request error
    } finally {
      setSubmitting(false);
    }
  }

  async function handleDelete(configKey: string) {
    try {
      await deleteConfig(configKey);
      message.success(t("config.deleteSuccess"));
      fetchData();
    } catch {
      // handled by request util
    }
  }

  const columns: TableProps<ConfigItem>["columns"] = [
    {
      title: t("config.colKey"),
      dataIndex: "configKey",
      width: 220,
      fixed: "left",
      render: (val: string) => <span className="font-mono text-xs">{val}</span>,
    },
    {
      title: t("config.colValue"),
      dataIndex: "configValue",
      width: 320,
      render: (val?: string) => (
        <div
          className="text-sm"
          style={{
            lineHeight: "20px",
            whiteSpace: "pre-wrap",
            wordBreak: "break-word",
          }}
        >
          {val || "—"}
        </div>
      ),
    },
    {
      title: t("config.colRemark"),
      dataIndex: "remark",
      width: 240,
      render: (val?: string) => <span>{val || "—"}</span>,
    },
    {
      title: t("config.colCreateTime"),
      dataIndex: "createTime",
      width: 170,
      render: (val?: string) => val || "—",
    },
    {
      title: t("config.colUpdateTime"),
      dataIndex: "updateTime",
      width: 170,
      render: (val?: string) => val || "—",
    },
    {
      title: t("config.colActions"),
      key: "actions",
      width: 140,
      fixed: "right",
      align: "center",
      render: (_, record) => (
        <Space size={0}>
          <Button
            type="link"
            size="small"
            icon={<EditOutlined />}
            onClick={() => openEdit(record)}
          >
            {t("common.edit")}
          </Button>
          <Popconfirm
            title={t("config.deleteConfirm")}
            onConfirm={() => handleDelete(record.configKey)}
            okText={t("common.confirm")}
            cancelText={t("common.cancel")}
          >
            <Button type="link" size="small" danger icon={<DeleteOutlined />}>
              {t("common.delete")}
            </Button>
          </Popconfirm>
        </Space>
      ),
    },
  ];

  return (
    <div>
      <div className="flex items-center justify-between mb-4">
        <Title level={4} style={{ margin: 0 }}>
          {t("config.title")}
        </Title>
        <Space>
          <Button icon={<ReloadOutlined />} onClick={fetchData}>
            {t("config.refresh")}
          </Button>
          <Button type="primary" icon={<PlusOutlined />} onClick={openAdd}>
            {t("config.addBtn")}
          </Button>
        </Space>
      </div>

      <Card style={{ marginBottom: 16 }}>
        <div className="flex flex-wrap items-center gap-3">
          <Input
            placeholder={t("config.searchPlaceholder")}
            prefix={<SearchOutlined />}
            value={keyword}
            onChange={(e) => setKeyword(e.target.value)}
            onPressEnter={handleSearch}
            style={{ width: 320 }}
            allowClear
          />
          <Button type="primary" icon={<SearchOutlined />} onClick={handleSearch}>
            {t("common.search")}
          </Button>
          <Button icon={<ReloadOutlined />} onClick={handleReset}>
            {t("config.reset")}
          </Button>
        </div>
        <Text type="secondary" style={{ display: "block", marginTop: 12, fontSize: 12 }}>
          {t("config.searchTip")}
        </Text>
      </Card>

      <Card>
        <Table<ConfigItem>
          rowKey="configKey"
          columns={columns}
          dataSource={data}
          loading={loading}
          scroll={{ x: 1200 }}
          size="middle"
          pagination={{
            current: query.page,
            pageSize: query.size,
            total,
            showSizeChanger: true,
            showQuickJumper: true,
            showTotal: (count) => t("common.paginationTotal", { total: count }),
            onChange: (page, size) => setQuery((prev) => ({ ...prev, page, size })),
          }}
        />
      </Card>

      <Modal
        open={modalOpen}
        title={editingKey ? t("config.editTitle") : t("config.addTitle")}
        onCancel={() => {
          setModalOpen(false);
          setEditingKey(null);
          form.resetFields();
        }}
        onOk={handleSubmit}
        confirmLoading={submitting}
        destroyOnClose
      >
        <Form form={form} layout="vertical" style={{ marginTop: 16 }}>
          <Form.Item
            name="configKey"
            label={t("config.fieldKey")}
            rules={[{ required: true, message: t("config.required") }]}
          >
            <Input
              placeholder={t("config.keyPlaceholder")}
              disabled={!!editingKey}
            />
          </Form.Item>
          <Form.Item name="configValue" label={t("config.fieldValue")}>
            <TextArea
              rows={4}
              placeholder={t("config.valuePlaceholder")}
            />
          </Form.Item>
          <Form.Item name="remark" label={t("config.fieldRemark")}>
            <TextArea
              rows={3}
              placeholder={t("config.remarkPlaceholder")}
            />
          </Form.Item>
        </Form>
      </Modal>
    </div>
  );
}