"use client";

import { PlusOutlined } from "@ant-design/icons";
import { useGetIdentity } from "@refinedev/core";
import { useTable } from "@refinedev/antd";
import { List } from "@refinedev/antd";
import { App, Button, Form, Input, InputNumber, Modal, Select, Space, Switch, Table, Typography, type TableColumnsType } from "antd";
import { useState } from "react";

import { adminRequestJson, type AdminIdentity } from "@/lib/admin/providers";
import { formatAdminDate } from "./resource-table";

const { Text } = Typography;

type FeatureFlag = {
  id: string;
  flagKey: string;
  version: number;
  enabled: boolean;
  rolloutPercentage: number;
  config: Record<string, unknown>;
  status: string;
  createdAt: string;
  publishedAt: string | null;
};

type FlagFilters = { q?: string; status?: string };

type FlagForm = {
  flagKey: string;
  enabled: boolean;
  rolloutPercentage: number;
  configJson: string;
};

export default function FeatureFlagsManagement() {
  const { message } = App.useApp();
  const { data: identity } = useGetIdentity<AdminIdentity>();
  const table = useTable<FeatureFlag, { message: string; statusCode: number }, FlagFilters>({
    resource: "feature-flags",
    syncWithLocation: true,
    pagination: { pageSize: 20 },
    onSearch: ({ q, status }) => [
      { field: "q", operator: "contains", value: q },
      { field: "status", operator: "eq", value: status },
    ],
  });
  const [form] = Form.useForm<FlagForm>();
  const [editing, setEditing] = useState<FeatureFlag | null>(null);
  const [open, setOpen] = useState(false);
  const [saving, setSaving] = useState(false);
  const [publishingId, setPublishingId] = useState<string | null>(null);
  const canWrite = Boolean(identity?.permissions.includes("ops.flags.write"));

  function edit(item?: FeatureFlag) {
    setEditing(item ?? null);
    form.setFieldsValue(item ? {
      flagKey: item.flagKey,
      enabled: item.enabled,
      rolloutPercentage: item.rolloutPercentage,
      configJson: JSON.stringify(item.config, null, 2),
    } : {
      flagKey: "",
      enabled: false,
      rolloutPercentage: 0,
      configJson: "{}",
    });
    setOpen(true);
  }

  async function save(values: FlagForm) {
    setSaving(true);
    try {
      let config: unknown;
      try {
        config = JSON.parse(values.configJson);
      } catch {
        throw new Error("配置 JSON 格式不正确");
      }
      await adminRequestJson("/api/admin/feature-flags", {
        method: "POST",
        body: JSON.stringify({
          action: "save",
          id: editing?.id ?? null,
          flagKey: values.flagKey.trim(),
          enabled: values.enabled,
          rolloutPercentage: values.rolloutPercentage,
          config,
          expectedVersion: editing?.version ?? null,
        }),
      });
      message.success("功能开关草稿已保存");
      setOpen(false);
      await table.tableQuery.refetch();
    } catch (error) {
      message.error(error instanceof Error ? error.message : "保存失败");
    } finally {
      setSaving(false);
    }
  }

  async function publish(item: FeatureFlag) {
    setPublishingId(item.id);
    try {
      await adminRequestJson("/api/admin/feature-flags", {
        method: "POST",
        body: JSON.stringify({ action: "publish", id: item.id, expectedVersion: item.version }),
      });
      message.success("功能开关已发布");
      await table.tableQuery.refetch();
    } catch (error) {
      message.error(error instanceof Error ? error.message : "发布失败");
    } finally {
      setPublishingId(null);
    }
  }

  const columns: TableColumnsType<FeatureFlag> = [
    { title: "开关", render: (_, item) => <Space direction="vertical" size={0}><Text strong>{item.flagKey}</Text><Text type="secondary">v{item.version}</Text></Space> },
    { title: "状态", render: (_, item) => <Text>{item.status === "published" ? "已发布" : item.status === "draft" ? "草稿" : item.status} · {item.enabled ? "已开启" : "已关闭"}</Text> },
    { title: "灰度", dataIndex: "rolloutPercentage", render: (value) => `${value}%` },
    { title: "配置", dataIndex: "config", render: (value) => <Text code>{JSON.stringify(value)}</Text> },
    { title: "发布时间", dataIndex: "publishedAt", render: formatAdminDate },
    {
      title: "操作",
      fixed: "right",
      render: (_, item) => <Space>{canWrite && <Button type="link" onClick={() => edit(item)}>编辑草稿</Button>}{canWrite && item.status !== "published" && <Button type="link" loading={publishingId === item.id} onClick={() => void publish(item)}>发布</Button>}</Space>,
    },
  ];

  return <List title="功能开关" headerButtons={canWrite ? <Button type="primary" icon={<PlusOutlined />} onClick={() => edit()}>新增开关</Button> : null}>
    <Space direction="vertical" size="middle" style={{ width: "100%" }}>
      <Form {...table.searchFormProps} layout="inline" style={{ rowGap: 8 }}>
        <Form.Item name="q" label="搜索"><Input.Search allowClear placeholder="开关键" /></Form.Item>
        <Form.Item name="status" label="状态">
          <Select
            allowClear
            placeholder="全部状态"
            style={{ minWidth: 140 }}
            options={["draft", "published", "retired"].map((value) => ({ value, label: value }))}
          />
        </Form.Item>
      </Form>
      <Table {...table.tableProps} columns={columns} rowKey="id" scroll={{ x: "max-content" }} />
    </Space>
    <Modal title={editing ? `编辑 ${editing.flagKey}` : "新增功能开关"} open={open} okText="保存草稿" cancelText="取消" confirmLoading={saving} onOk={() => form.submit()} onCancel={() => setOpen(false)} destroyOnHidden>
      <Form<FlagForm> form={form} layout="vertical" onFinish={save}>
        <Form.Item name="flagKey" label="开关键" rules={[{ required: true }, { pattern: /^[a-z][a-z0-9._-]{1,99}$/ }]}><Input disabled={Boolean(editing)} /></Form.Item>
        <Form.Item name="rolloutPercentage" label="灰度百分比" rules={[{ required: true }]}><InputNumber min={0} max={100} precision={0} style={{ width: "100%" }} /></Form.Item>
        <Form.Item name="enabled" label="启用" valuePropName="checked"><Switch /></Form.Item>
        <Form.Item name="configJson" label="配置 JSON" rules={[{ required: true }]}><Input.TextArea rows={6} spellCheck={false} /></Form.Item>
      </Form>
    </Modal>
  </List>;
}