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 { Download, Plus, RefreshCw, Search, SlidersHorizontal } from 'lucide-react';
import { useEffect, useState } from 'react';

import { PageHeader, Surface } from '@/components/Page';
import { apiRequest, downloadFile, jsonOptions } from '@/services/api';
import type {
  ChatSummary,
  Paged,
  PointAccount,
  PointRules,
  PointTransaction,
} from '@/types';
import { pointSourceLabel, pointSourceOptions } from '@/utils/labels';
import { userDisplayName } from '@/utils/users';

export default function PointsPage() {
  const [chats, setChats] = useState<ChatSummary[]>([]);
  const [chatId, setChatId] = useState<string>();
  const [accounts, setAccounts] = useState<Paged<PointAccount>>({ items: [], total: 0, page: 1, page_size: 20 });
  const [transactions, setTransactions] = useState<Paged<PointTransaction>>({ items: [], total: 0, page: 1, page_size: 20 });
  const [query, setQuery] = useState('');
  const [source, setSource] = useState<string>();
  const [loading, setLoading] = useState(false);
  const [adjustOpen, setAdjustOpen] = useState(false);
  const [adjustForm] = Form.useForm();

  useEffect(() => {
    apiRequest<Paged<ChatSummary>>('/chats?page_size=100').then((result) => {
      setChats(result.items);
      if (result.items.length) setChatId(result.items[0].chat_id);
    });
  }, []);

  const loadAccounts = async (page = 1) => {
    if (!chatId) return;
    setLoading(true);
    try {
      const params = new URLSearchParams({ chat_id: chatId, page: String(page), page_size: '20', query });
      setAccounts(await apiRequest<Paged<PointAccount>>(`/points/accounts?${params}`));
    } finally {
      setLoading(false);
    }
  };

  const loadTransactions = async (page = 1) => {
    if (!chatId) return;
    setLoading(true);
    try {
      const params = new URLSearchParams({ chat_id: chatId, page: String(page), page_size: '20' });
      if (source) params.set('source', source);
      setTransactions(await apiRequest<Paged<PointTransaction>>(`/points/transactions?${params}`));
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    void loadAccounts(1);
    void loadTransactions(1);
  }, [chatId, source]);

  const accountColumns: ColumnsType<PointAccount> = [
    {
      title: '成员',
      key: 'member',
      minWidth: 190,
      render: (_, item) => (
        <Space direction="vertical" size={0}>
          <Typography.Text strong>{userDisplayName(item)}</Typography.Text>
          <Typography.Text type="secondary" className="numeric">{item.user_id}</Typography.Text>
        </Space>
      ),
    },
    { title: '余额', dataIndex: 'balance', width: 110, sorter: (a, b) => a.balance - b.balance, render: (value) => <Typography.Text strong className="numeric">{value}</Typography.Text> },
    { title: '累计获得', dataIndex: 'lifetime_earned', width: 120, responsive: ['md'], className: 'numeric' },
    { title: '累计消耗', dataIndex: 'lifetime_spent', width: 120, responsive: ['md'], className: 'numeric' },
    { title: '更新时间', dataIndex: 'updated_at', width: 160, responsive: ['lg'], render: (value) => (value ? dayjs(value).format('YYYY-MM-DD HH:mm') : '-') },
    {
      title: '操作',
      width: 90,
      fixed: 'right',
      render: (_, item) => (
        <Button
          type="link"
          onClick={() => {
            adjustForm.setFieldsValue({ user_id: item.user_id, operation: 'add', amount: 0, reason: '' });
            setAdjustOpen(true);
          }}
        >
          调整
        </Button>
      ),
    },
  ];

  const transactionColumns: ColumnsType<PointTransaction> = [
    { title: '时间', dataIndex: 'created_at', width: 165, render: (value) => dayjs(value).format('YYYY-MM-DD HH:mm:ss') },
    {
      title: '成员',
      key: 'member',
      width: 190,
      render: (_, item) => (
        <Space direction="vertical" size={0}>
          <Typography.Text strong>{userDisplayName(item)}</Typography.Text>
          <Typography.Text type="secondary" className="numeric">{item.user_id}</Typography.Text>
        </Space>
      ),
    },
    {
      title: '变化',
      dataIndex: 'delta',
      width: 90,
      render: (value: number) => (
        <Typography.Text strong type={value < 0 ? 'danger' : 'success'}>
          {value > 0 ? '+' : ''}{value}
        </Typography.Text>
      ),
    },
    { title: '余额', dataIndex: 'balance_after', width: 90, className: 'numeric' },
    { title: '来源', dataIndex: 'source', width: 180, render: (value) => <Tag>{pointSourceLabel(value)}</Tag> },
    { title: '原因', dataIndex: 'reason', minWidth: 220, ellipsis: true },
    { title: '关联对象', dataIndex: 'reference_id', width: 150, responsive: ['lg'], render: (value) => value || '-' },
  ];

  const selectedChat = chats.find((chat) => chat.chat_id === chatId);

  return (
    <>
      <PageHeader
        title="积分管理"
        actions={
          <Space wrap>
            <Button icon={<RefreshCw size={16} />} loading={loading} onClick={() => { void loadAccounts(accounts.page); void loadTransactions(transactions.page); }}>
              刷新
            </Button>
            <Button type="primary" icon={<Plus size={16} />} disabled={!chatId} onClick={() => setAdjustOpen(true)}>
              手工调整
            </Button>
          </Space>
        }
      />
      <Surface>
        <div className="page-toolbar">
          <Select
            showSearch
            optionFilterProp="label"
            value={chatId}
            onChange={setChatId}
            placeholder="选择群组"
            style={{ width: 'min(320px, 100%)' }}
            options={chats.map((chat) => ({ value: chat.chat_id, label: chat.title }))}
          />
          {selectedChat ? <Typography.Text type="secondary">群 ID：{selectedChat.chat_id}</Typography.Text> : null}
        </div>
        {!chatId ? (
          <Alert showIcon type="info" message="请选择群组后查看积分数据。" />
        ) : (
          <Tabs
            items={[
              {
                key: 'accounts',
                label: `余额与排行 (${accounts.total})`,
                children: (
                  <>
                    <div className="page-toolbar">
                      <Input
                        allowClear
                        value={query}
                        onChange={(event) => setQuery(event.target.value)}
                        onPressEnter={() => void loadAccounts(1)}
                        prefix={<Search size={16} />}
                        placeholder="用户 ID、@username 或名称"
                        style={{ width: 'min(340px, 100%)' }}
                      />
                      <Button icon={<Download size={16} />} onClick={() => void downloadFile(`/points/export?chat_id=${chatId}&kind=accounts`, `points-${chatId}-accounts.csv`)}>
                        导出账户
                      </Button>
                    </div>
                    <Table
                      rowKey="user_id"
                      columns={accountColumns}
                      dataSource={accounts.items}
                      loading={loading}
                      pagination={{ current: accounts.page, pageSize: accounts.page_size, total: accounts.total, showSizeChanger: false }}
                      onChange={(pagination) => void loadAccounts(pagination.current || 1)}
                      scroll={{ x: 850 }}
                    />
                  </>
                ),
              },
              {
                key: 'transactions',
                label: `流水 (${transactions.total})`,
                children: (
                  <>
                    <div className="page-toolbar">
                      <Select allowClear value={source} onChange={setSource} placeholder="全部来源" options={pointSourceOptions} style={{ width: 220 }} />
                      <Button icon={<Download size={16} />} onClick={() => void downloadFile(`/points/export?chat_id=${chatId}&kind=transactions`, `points-${chatId}-transactions.csv`)}>
                        导出流水
                      </Button>
                    </div>
                    <Table
                      rowKey="transaction_id"
                      columns={transactionColumns}
                      dataSource={transactions.items}
                      loading={loading}
                      pagination={{ current: transactions.page, pageSize: transactions.page_size, total: transactions.total, showSizeChanger: false }}
                      onChange={(pagination) => void loadTransactions(pagination.current || 1)}
                      scroll={{ x: 1050 }}
                    />
                  </>
                ),
              },
              {
                key: 'rules',
                label: '自动积分规则',
                children: <RulesEditor chatId={chatId} />,
              },
            ]}
          />
        )}
      </Surface>
      <Modal
        title="手工调整积分"
        open={adjustOpen}
        okText="继续确认"
        onCancel={() => setAdjustOpen(false)}
        onOk={() => adjustForm.submit()}
        destroyOnHidden
      >
        <Form
          form={adjustForm}
          layout="vertical"
          initialValues={{ operation: 'add', amount: 0 }}
          onFinish={(values) => {
            Modal.confirm({
              title: '确认写入积分流水？',
              content: '历史流水不可修改或删除。',
              okText: '确认写入',
              okButtonProps: { danger: values.operation === 'deduct' || values.operation === 'set' },
              onOk: async () => {
                await apiRequest(
                  '/points/adjustments',
                  jsonOptions('POST', {
                    ...values,
                    chat_id: chatId,
                    request_id: crypto.randomUUID(),
                    confirm: true,
                  }),
                );
                message.success('积分已调整并写入流水');
                setAdjustOpen(false);
                adjustForm.resetFields();
                await loadAccounts(1);
                await loadTransactions(1);
              },
            });
          }}
        >
          <Form.Item name="user_id" label="用户 ID" rules={[{ required: true }, { pattern: /^\d+$/, message: '请输入十进制用户 ID' }]}>
            <Input inputMode="numeric" />
          </Form.Item>
          <Form.Item name="operation" label="操作" rules={[{ required: true }]}>
            <Select options={[{ value: 'add', label: '增加' }, { value: 'deduct', label: '扣减' }, { value: 'set', label: '设置余额' }]} />
          </Form.Item>
          <Form.Item name="amount" label="积分数值" rules={[{ required: true }]}>
            <InputNumber min={0} precision={0} style={{ width: '100%' }} />
          </Form.Item>
          <Form.Item name="reason" label="原因" rules={[{ required: true, message: '必须填写调整原因' }]}>
            <Input.TextArea rows={3} maxLength={500} showCount />
          </Form.Item>
        </Form>
      </Modal>
    </>
  );
}

function RulesEditor({ chatId }: { chatId: string }) {
  const [form] = Form.useForm<PointRules>();
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    setLoading(true);
    apiRequest<PointRules>(`/chats/${chatId}/points/settings`)
      .then((rules) => form.setFieldsValue(rules))
      .finally(() => setLoading(false));
  }, [chatId]);

  return (
    <Form
      form={form}
      layout="vertical"
      disabled={loading}
      onFinish={(values) => {
        Modal.confirm({
          title: '确认更新积分规则？',
          content: '新规则会影响后续积分奖励；底部按钮状态变化时会向群内发送提示。',
          okText: '确认保存',
          onOk: async () => {
            const saved = await apiRequest<PointRules>(
              `/chats/${chatId}/points/settings`,
              jsonOptions('PUT', { ...values, confirm: true }),
            );
            form.setFieldsValue(saved);
            message.success('积分规则已保存');
          },
        });
      }}
    >
      <div className="page-toolbar">
        <Space size="large" wrap>
          <Form.Item name="enabled" label="积分系统" valuePropName="checked" style={{ marginBottom: 0 }}><Switch /></Form.Item>
          <Form.Item name="timezone" label="群时区" style={{ marginBottom: 0 }}>
            <Select style={{ width: 200 }} options={[{ value: 'Asia/Shanghai' }, { value: 'UTC' }, { value: 'Asia/Tokyo' }, { value: 'America/Los_Angeles' }]} />
          </Form.Item>
          <Form.Item name="checkin_button_enabled" label="底部签到按钮" valuePropName="checked" style={{ marginBottom: 0 }}>
            <Switch />
          </Form.Item>
        </Space>
        <Button type="primary" htmlType="submit" icon={<SlidersHorizontal size={16} />}>保存规则</Button>
      </div>
      <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(210px, 1fr))', gap: 16 }}>
        <RuleGroup title="签到" enabled="checkin_enabled" fields={[['checkin_points', '每日奖励']]} />
        <RuleGroup title="活跃消息" enabled="activity_enabled" fields={[['activity_points', '单次奖励'], ['activity_cooldown_seconds', '冷却秒数'], ['activity_daily_cap', '每日上限']]} />
        <RuleGroup title="有效点赞" enabled="upvote_enabled" fields={[['upvote_points', '单次奖励'], ['upvote_pair_cooldown_seconds', '双方冷却秒数'], ['upvote_daily_cap', '每日上限']]} />
      </div>
    </Form>
  );
}

function RuleGroup({ title, enabled, fields }: { title: string; enabled: string; fields: string[][] }) {
  return (
    <section className="rule-group">
      <h3 className="rule-group-title">{title}</h3>
      <Form.Item name={enabled} label="启用" valuePropName="checked"><Switch /></Form.Item>
      {fields.map(([name, label]) => (
        <Form.Item key={name} name={name} label={label} rules={[{ required: true }]}>
          <InputNumber min={0} precision={0} style={{ width: '100%' }} />
        </Form.Item>
      ))}
    </section>
  );
}