import {
  Alert,
  Button,
  Form,
  Input,
  InputNumber,
  Modal,
  Select,
  Space,
  Switch,
  Table,
  Tabs,
  Tag,
  Typography,
  message,
} from 'antd';
import type { ColumnsType } from 'antd/es/table';
import dayjs from 'dayjs';
import {
  RefreshCw,
  Search,
  Settings2,
  UserRoundCheck,
  UserRoundX,
} from 'lucide-react';
import { useEffect, useState } from 'react';

import { PageHeader, Surface } from '@/components/Page';
import { apiRequest, jsonOptions } from '@/services/api';
import type {
  DirectoryApplicationStatus,
  DirectoryEvent,
  DirectoryLocation,
  DirectoryProfile,
  DirectorySettings,
  Paged,
} from '@/types';

const emptyPage = <T,>(): Paged<T> => ({
  items: [],
  total: 0,
  page: 1,
  page_size: 20,
});

const applicationLabels: Record<DirectoryApplicationStatus, string> = {
  none: '学生',
  pending: '待审批',
  approved: '已批准',
  rejected: '已拒绝',
  revoked: '已撤销',
};

const applicationColors: Record<DirectoryApplicationStatus, string> = {
  none: 'default',
  pending: 'processing',
  approved: 'success',
  rejected: 'error',
  revoked: 'warning',
};

const eventLabels: Record<string, string> = {
  location_updated: '更新位置',
  location_cleared: '清除位置',
  geocode_consent_updated: '区域解析授权',
  teacher_application_submitted: '提交老师申请',
  teacher_application_approve: '批准老师',
  teacher_application_reject: '拒绝申请',
  teacher_application_revoke: '撤销老师',
  teacher_list: '上榜',
  teacher_unlist: '下榜',
  teacher_online: '上线',
  teacher_offline: '下线',
  teacher_auto_offline: '自动下线',
  teacher_username_removed: '用户名移除',
};

type ActionTarget = {
  kind: 'application' | 'profile' | 'location';
  action: string;
  user_id: string;
  display_name?: string | null;
};

export default function DirectoryPage() {
  const [applications, setApplications] = useState<Paged<DirectoryProfile>>(emptyPage());
  const [profiles, setProfiles] = useState<Paged<DirectoryProfile>>(emptyPage());
  const [locations, setLocations] = useState<Paged<DirectoryLocation>>(emptyPage());
  const [events, setEvents] = useState<Paged<DirectoryEvent>>(emptyPage());
  const [settings, setSettings] = useState<DirectorySettings | null>(null);
  const [loading, setLoading] = useState(false);
  const [query, setQuery] = useState('');
  const [applicationStatus, setApplicationStatus] = useState('pending');
  const [actionTarget, setActionTarget] = useState<ActionTarget | null>(null);
  const [locationTarget, setLocationTarget] = useState<DirectoryLocation | null>(null);
  const [actionForm] = Form.useForm<{ reason: string }>();
  const [locationForm] = Form.useForm<{
    longitude: number;
    latitude: number;
    reason: string;
  }>();
  const [settingsForm] = Form.useForm<DirectorySettings>();

  const loadApplications = async (page = 1) => {
    const params = new URLSearchParams({
      page: String(page),
      page_size: '20',
      status: applicationStatus,
      query,
    });
    setApplications(
      await apiRequest<Paged<DirectoryProfile>>(`/directory/applications?${params}`),
    );
  };

  const loadProfiles = async (page = 1) => {
    const params = new URLSearchParams({
      page: String(page),
      page_size: '20',
      application_status: 'approved',
      query,
    });
    setProfiles(
      await apiRequest<Paged<DirectoryProfile>>(`/directory/profiles?${params}`),
    );
  };

  const loadLocations = async (page = 1) => {
    const params = new URLSearchParams({
      page: String(page),
      page_size: '20',
      query,
    });
    setLocations(
      await apiRequest<Paged<DirectoryLocation>>(`/directory/locations?${params}`),
    );
  };

  const loadEvents = async (page = 1) => {
    const params = new URLSearchParams({
      page: String(page),
      page_size: '20',
      query,
    });
    setEvents(await apiRequest<Paged<DirectoryEvent>>(`/directory/events?${params}`));
  };

  const loadSettings = async () => {
    const result = await apiRequest<DirectorySettings>('/directory/settings');
    setSettings(result);
    settingsForm.setFieldsValue(result);
  };

  const refresh = async () => {
    setLoading(true);
    try {
      await Promise.all([
        loadApplications(applications.page),
        loadProfiles(profiles.page),
        loadLocations(locations.page),
        loadEvents(events.page),
        loadSettings(),
      ]);
    } catch (error) {
      message.error(error instanceof Error ? error.message : '目录数据加载失败');
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    void refresh();
  }, [applicationStatus]);

  const approve = (item: DirectoryProfile) => {
    Modal.confirm({
      title: `批准 ${item.display_name || item.user_id} 成为老师？`,
      content: '批准后老师身份、位置和状态将在全部群和全部 Bot 中生效。',
      okText: '确认批准',
      onOk: async () => {
        await apiRequest(
          `/directory/applications/${item.user_id}/actions`,
          jsonOptions('POST', { action: 'approve', confirm: true }),
        );
        message.success('老师申请已批准');
        await refresh();
      },
    });
  };

  const openAction = (target: ActionTarget) => {
    actionForm.resetFields();
    setActionTarget(target);
  };

  const submitAction = async ({ reason }: { reason: string }) => {
    if (!actionTarget) return;
    if (actionTarget.kind === 'application') {
      await apiRequest(
        `/directory/applications/${actionTarget.user_id}/actions`,
        jsonOptions('POST', {
          action: actionTarget.action,
          reason,
          confirm: true,
        }),
      );
    } else if (actionTarget.kind === 'profile') {
      await apiRequest(
        `/directory/profiles/${actionTarget.user_id}/actions`,
        jsonOptions('POST', {
          action: actionTarget.action,
          reason,
          confirm: true,
        }),
      );
    } else {
      await apiRequest(
        `/directory/locations/${actionTarget.user_id}`,
        jsonOptions('DELETE', { reason, confirm: true }),
      );
    }
    message.success('全平台目录状态已更新');
    setActionTarget(null);
    await refresh();
  };

  const applicationColumns: ColumnsType<DirectoryProfile> = [
    {
      title: '成员',
      minWidth: 210,
      render: (_, item) => (
        <Space direction="vertical" size={0}>
          <Typography.Text strong>{item.display_name || `用户 ${item.user_id}`}</Typography.Text>
          <Typography.Text type="secondary">
            {item.username ? `@${item.username}` : '未设置用户名'} · {item.user_id}
          </Typography.Text>
        </Space>
      ),
    },
    {
      title: '状态',
      dataIndex: 'application_status',
      width: 110,
      render: (value: DirectoryApplicationStatus) => (
        <Tag color={applicationColors[value]}>{applicationLabels[value]}</Tag>
      ),
    },
    {
      title: '位置',
      minWidth: 170,
      render: (_, item) =>
        item.location ? item.location.region?.label || '区域暂不可用' : '尚未更新',
    },
    {
      title: '申请时间',
      dataIndex: 'applied_at',
      width: 165,
      responsive: ['lg'],
      render: (value) => (value ? dayjs(value).format('YYYY-MM-DD HH:mm') : '-'),
    },
    {
      title: '操作',
      width: 190,
      fixed: 'right',
      render: (_, item) => (
        <Space>
          {item.application_status !== 'approved' ? (
            <Button
              type="link"
              icon={<UserRoundCheck size={16} />}
              onClick={() => approve(item)}
            >
              批准
            </Button>
          ) : null}
          {item.application_status === 'pending' ? (
            <Button
              type="link"
              danger
              icon={<UserRoundX size={16} />}
              onClick={() =>
                openAction({
                  kind: 'application',
                  action: 'reject',
                  user_id: item.user_id,
                  display_name: item.display_name,
                })
              }
            >
              拒绝
            </Button>
          ) : null}
        </Space>
      ),
    },
  ];

  const profileColumns: ColumnsType<DirectoryProfile> = [
    applicationColumns[0],
    {
      title: '榜单',
      dataIndex: 'listed',
      width: 90,
      render: (value) => <Tag color={value ? 'success' : 'default'}>{value ? '已上榜' : '未上榜'}</Tag>,
    },
    {
      title: '上下线',
      dataIndex: 'online',
      width: 90,
      render: (value) => <Tag color={value ? 'processing' : 'default'}>{value ? '在线' : '离线'}</Tag>,
    },
    {
      title: '区域',
      minWidth: 160,
      render: (_, item) => item.location?.region?.label || '区域暂不可用',
    },
    {
      title: '自动下线',
      dataIndex: 'online_until',
      width: 165,
      responsive: ['lg'],
      render: (value) => (value ? dayjs(value).format('YYYY-MM-DD HH:mm') : '-'),
    },
    {
      title: '操作',
      width: 300,
      fixed: 'right',
      render: (_, item) => (
        <Space wrap>
          <Button
            size="small"
            onClick={() =>
              openAction({
                kind: 'profile',
                action: item.listed ? 'unlist' : 'list',
                user_id: item.user_id,
                display_name: item.display_name,
              })
            }
          >
            {item.listed ? '强制下榜' : '强制上榜'}
          </Button>
          <Button
            size="small"
            onClick={() =>
              openAction({
                kind: 'profile',
                action: item.online ? 'offline' : 'online',
                user_id: item.user_id,
                display_name: item.display_name,
              })
            }
          >
            {item.online ? '强制下线' : '强制上线'}
          </Button>
          <Button
            size="small"
            danger
            onClick={() =>
              openAction({
                kind: 'application',
                action: 'revoke',
                user_id: item.user_id,
                display_name: item.display_name,
              })
            }
          >
            撤销资格
          </Button>
        </Space>
      ),
    },
  ];

  const locationColumns: ColumnsType<DirectoryLocation> = [
    {
      title: '成员',
      minWidth: 210,
      render: (_, item) => (
        <Space direction="vertical" size={0}>
          <Typography.Text strong>{item.display_name || `用户 ${item.user_id}`}</Typography.Text>
          <Typography.Text type="secondary">{item.username ? `@${item.username}` : item.user_id}</Typography.Text>
        </Space>
      ),
    },
    {
      title: '精确坐标',
      width: 220,
      render: (_, item) => (
        <Typography.Text className="numeric">
          {item.latitude.toFixed(6)}, {item.longitude.toFixed(6)}
        </Typography.Text>
      ),
    },
    {
      title: '区域',
      minWidth: 170,
      render: (_, item) => item.region?.label || '区域暂不可用',
    },
    {
      title: 'Nominatim',
      width: 130,
      render: (_, item) => (
        <Tag color={item.geocode_consent === true ? 'success' : 'default'}>
          {item.geocode_consent === true
            ? '已授权'
            : item.geocode_consent === false
              ? '已关闭'
              : '待选择'}
        </Tag>
      ),
    },
    {
      title: '更新时间',
      dataIndex: 'updated_at',
      width: 165,
      responsive: ['lg'],
      render: (value) => dayjs(value).format('YYYY-MM-DD HH:mm'),
    },
    {
      title: '操作',
      width: 150,
      fixed: 'right',
      render: (_, item) => (
        <Space>
          <Button
            type="link"
            onClick={() => {
              setLocationTarget(item);
              locationForm.setFieldsValue({
                longitude: item.longitude,
                latitude: item.latitude,
                reason: '',
              });
            }}
          >
            修正
          </Button>
          <Button
            type="link"
            danger
            onClick={() =>
              openAction({
                kind: 'location',
                action: 'delete',
                user_id: item.user_id,
                display_name: item.display_name,
              })
            }
          >
            清除
          </Button>
        </Space>
      ),
    },
  ];

  const eventColumns: ColumnsType<DirectoryEvent> = [
    {
      title: '时间',
      dataIndex: 'created_at',
      width: 170,
      render: (value) => dayjs(value).format('YYYY-MM-DD HH:mm:ss'),
    },
    {
      title: '事件',
      dataIndex: 'event_type',
      width: 150,
      render: (value) => <Tag>{eventLabels[value] || value}</Tag>,
    },
    { title: '成员 ID', dataIndex: 'user_id', width: 145, className: 'numeric' },
    { title: '操作者', dataIndex: 'actor_name', width: 150, render: (value) => value || '系统' },
    { title: '来源', dataIndex: 'source', width: 150, responsive: ['lg'] },
    { title: '原因', dataIndex: 'reason', minWidth: 220, ellipsis: true },
  ];

  const searchToolbar = (
    <div className="page-toolbar">
      <Input
        allowClear
        value={query}
        onChange={(event) => setQuery(event.target.value)}
        onPressEnter={() => void refresh()}
        prefix={<Search size={16} />}
        placeholder="用户 ID、@username 或昵称"
        style={{ width: 'min(360px, 100%)' }}
      />
      <Button icon={<Search size={16} />} onClick={() => void refresh()}>
        查询
      </Button>
    </div>
  );

  return (
    <>
      <PageHeader
        title="师生与附近"
        actions={
          <Button icon={<RefreshCw size={16} />} loading={loading} onClick={() => void refresh()}>
            刷新
          </Button>
        }
      />
      <Alert
        showIcon
        type="warning"
        message="位置属于敏感信息"
        description="精确坐标仅供 Web 超级管理员修正；Telegram 榜单只显示距离和省市区。所有状态操作均为全平台生效。"
        style={{ marginBottom: 16 }}
      />
      <Surface>
        <Tabs
          items={[
            {
              key: 'applications',
              label: `申请审批 (${applications.total})`,
              children: (
                <>
                  <div className="page-toolbar">
                    <Select
                      value={applicationStatus}
                      onChange={setApplicationStatus}
                      style={{ width: 150 }}
                      options={[
                        { value: 'pending', label: '待审批' },
                        { value: 'rejected', label: '已拒绝' },
                        { value: 'revoked', label: '已撤销' },
                        { value: 'approved', label: '已批准' },
                      ]}
                    />
                    {searchToolbar}
                  </div>
                  <Table
                    rowKey="user_id"
                    columns={applicationColumns}
                    dataSource={applications.items}
                    loading={loading}
                    pagination={{
                      current: applications.page,
                      pageSize: applications.page_size,
                      total: applications.total,
                      showSizeChanger: false,
                    }}
                    onChange={(pagination) => void loadApplications(pagination.current || 1)}
                    scroll={{ x: 850 }}
                  />
                </>
              ),
            },
            {
              key: 'teachers',
              label: `老师目录 (${profiles.total})`,
              children: (
                <>
                  {searchToolbar}
                  <Table
                    rowKey="user_id"
                    columns={profileColumns}
                    dataSource={profiles.items}
                    loading={loading}
                    pagination={{
                      current: profiles.page,
                      pageSize: profiles.page_size,
                      total: profiles.total,
                      showSizeChanger: false,
                    }}
                    onChange={(pagination) => void loadProfiles(pagination.current || 1)}
                    scroll={{ x: 1150 }}
                  />
                </>
              ),
            },
            {
              key: 'locations',
              label: `位置管理 (${locations.total})`,
              children: (
                <>
                  {searchToolbar}
                  <Table
                    rowKey="user_id"
                    columns={locationColumns}
                    dataSource={locations.items}
                    loading={loading}
                    pagination={{
                      current: locations.page,
                      pageSize: locations.page_size,
                      total: locations.total,
                      showSizeChanger: false,
                    }}
                    onChange={(pagination) => void loadLocations(pagination.current || 1)}
                    scroll={{ x: 1050 }}
                  />
                </>
              ),
            },
            {
              key: 'events',
              label: `状态事件 (${events.total})`,
              children: (
                <>
                  {searchToolbar}
                  <Table
                    rowKey="event_id"
                    columns={eventColumns}
                    dataSource={events.items}
                    loading={loading}
                    pagination={{
                      current: events.page,
                      pageSize: events.page_size,
                      total: events.total,
                      showSizeChanger: false,
                    }}
                    onChange={(pagination) => void loadEvents(pagination.current || 1)}
                    scroll={{ x: 1000 }}
                  />
                </>
              ),
            },
            {
              key: 'settings',
              label: '目录设置',
              forceRender: true,
              children: (
                <Form
                  form={settingsForm}
                  layout="vertical"
                  onFinish={(values) => {
                    Modal.confirm({
                      title: '确认更新全平台目录设置？',
                      content: '设置会影响所有具备“师生与附近”职责的机器人。',
                      okText: '确认保存',
                      onOk: async () => {
                        const saved = await apiRequest<DirectorySettings>(
                          '/directory/settings',
                          jsonOptions('PUT', { ...values, confirm: true }),
                        );
                        setSettings(saved);
                        settingsForm.setFieldsValue(saved);
                        message.success('目录设置已保存');
                      },
                    });
                  }}
                  style={{ maxWidth: 760 }}
                >
                  <Alert
                    showIcon
                    type={settings?.nominatim_ready ? 'success' : 'info'}
                    message={
                      settings?.nominatim_ready
                        ? 'Nominatim 区域解析已就绪'
                        : '未填写联系信息时只计算距离，不会发送坐标'
                    }
                    style={{ marginBottom: 20 }}
                  />
                  <Form.Item
                    name="nominatim_enabled"
                    label="启用 OpenStreetMap Nominatim 区域解析"
                    valuePropName="checked"
                  >
                    <Switch />
                  </Form.Item>
                  <Form.Item
                    name="nominatim_contact"
                    label="应用联系邮箱或 URL"
                    extra="公共 Nominatim 要求 User-Agent 能识别应用；留空时禁止外发坐标。"
                  >
                    <Input placeholder="admin@example.com" />
                  </Form.Item>
                  <Form.Item
                    name="nominatim_endpoint"
                    label="Nominatim 服务地址"
                    rules={[{ required: true }]}
                  >
                    <Input />
                  </Form.Item>
                  <Form.Item
                    name="nominatim_user_agent"
                    label="应用 User-Agent"
                    rules={[{ required: true }]}
                  >
                    <Input />
                  </Form.Item>
                  <Form.Item name="nearby_radius_km" label="默认附近范围">
                    <Select
                      options={(settings?.nearby_radius_options_km || [5, 10, 20, 50]).map(
                        (value) => ({ value, label: `${value} 公里` }),
                      )}
                    />
                  </Form.Item>
                  <Space wrap>
                    <Button type="primary" htmlType="submit" icon={<Settings2 size={16} />}>
                      保存设置
                    </Button>
                    <Button
                      type="link"
                      href={settings?.attribution_url || 'https://www.openstreetmap.org/copyright'}
                      target="_blank"
                    >
                      {settings?.attribution || '© OpenStreetMap contributors'}
                    </Button>
                  </Space>
                </Form>
              ),
            },
          ]}
        />
      </Surface>

      <Modal
        title={`确认全平台操作：${actionTarget?.display_name || actionTarget?.user_id || ''}`}
        open={Boolean(actionTarget)}
        okText="继续确认"
        okButtonProps={{ danger: true }}
        onCancel={() => setActionTarget(null)}
        onOk={() => actionForm.submit()}
        destroyOnHidden
      >
        <Alert
          showIcon
          type="warning"
          message="此操作将影响全部群和全部 Bot"
          style={{ marginBottom: 16 }}
        />
        <Form form={actionForm} layout="vertical" onFinish={submitAction}>
          <Form.Item
            name="reason"
            label="操作原因"
            rules={[{ required: true, message: '必须填写操作原因' }]}
          >
            <Input.TextArea rows={3} maxLength={500} showCount />
          </Form.Item>
        </Form>
      </Modal>

      <Modal
        title={`修正位置：${locationTarget?.display_name || locationTarget?.user_id || ''}`}
        open={Boolean(locationTarget)}
        okText="继续确认"
        onCancel={() => setLocationTarget(null)}
        onOk={() => locationForm.submit()}
        destroyOnHidden
      >
        <Form
          form={locationForm}
          layout="vertical"
          onFinish={(values) => {
            if (!locationTarget) return;
            Modal.confirm({
              title: '确认保存精确坐标？',
              content: '若该用户已授权区域解析，新坐标会进入 Nominatim 队列。',
              okText: '确认保存',
              onOk: async () => {
                await apiRequest(
                  `/directory/locations/${locationTarget.user_id}`,
                  jsonOptions('PUT', { ...values, confirm: true }),
                );
                message.success('位置已修正');
                setLocationTarget(null);
                await refresh();
              },
            });
          }}
        >
          <Form.Item
            name="longitude"
            label="经度"
            rules={[{ required: true }]}
          >
            <InputNumber min={-180} max={180} precision={7} style={{ width: '100%' }} />
          </Form.Item>
          <Form.Item
            name="latitude"
            label="纬度"
            rules={[{ required: true }]}
          >
            <InputNumber min={-90} max={90} precision={7} style={{ width: '100%' }} />
          </Form.Item>
          <Form.Item
            name="reason"
            label="修正原因"
            rules={[{ required: true, message: '必须填写修正原因' }]}
          >
            <Input.TextArea rows={3} maxLength={500} showCount />
          </Form.Item>
        </Form>
      </Modal>
    </>
  );
}