import {
  Button,
  DatePicker,
  Descriptions,
  Divider,
  Drawer,
  Form,
  Input,
  InputNumber,
  Modal,
  Popconfirm,
  Select,
  Space,
  Table,
  Tag,
  Typography,
  message,
} from 'antd';
import type { ColumnsType } from 'antd/es/table';
import dayjs from 'dayjs';
import { Download, Plus, RefreshCw, RotateCcw, Trash2, Trophy, UserX } from 'lucide-react';
import { useLocation } from '@umijs/max';
import { useEffect, useState } from 'react';

import { PageHeader, Surface } from '@/components/Page';
import { StatusTag } from '@/components/StatusTag';
import { apiRequest, downloadFile, jsonOptions } from '@/services/api';
import type { ChatSummary, Giveaway, Paged } from '@/types';
import { userDisplayName } from '@/utils/users';
import { giveawayDisplayStatus } from '@/utils/giveaways';

interface Participant {
  giveaway_id: string;
  chat_id: string;
  user_id: string;
  username?: string | null;
  first_name?: string | null;
  last_name?: string | null;
  display_name?: string | null;
  active?: boolean;
  entry_cost?: number;
  joined_at: string;
  removed_at?: string | null;
  refunded_at?: string | null;
}

interface GiveawayBan {
  chat_id: string;
  user_id: string;
  reason?: string | null;
  moderator_id?: string | null;
  created_at: string;
}

export default function GiveawaysPage() {
  const location = useLocation();
  const initialChat = new URLSearchParams(location.search).get('chat_id') || undefined;
  const [data, setData] = useState<Paged<Giveaway>>({ items: [], total: 0, page: 1, page_size: 20 });
  const [chats, setChats] = useState<ChatSummary[]>([]);
  const [chatId, setChatId] = useState<string | undefined>();
  const [status, setStatus] = useState<string | undefined>();
  const [loading, setLoading] = useState(false);
  const [createOpen, setCreateOpen] = useState(false);
  const [createForm] = Form.useForm();
  const [selected, setSelected] = useState<Giveaway | null>(null);
  const [participants, setParticipants] = useState<Participant[]>([]);
  const [banOpen, setBanOpen] = useState(false);
  const [bans, setBans] = useState<Paged<GiveawayBan>>({ items: [], total: 0, page: 1, page_size: 20 });
  const [banLoading, setBanLoading] = useState(false);
  const [banForm] = Form.useForm();

  const load = async (page = 1) => {
    setLoading(true);
    try {
      const params = new URLSearchParams({ page: String(page), page_size: '20' });
      if (chatId) params.set('chat_id', chatId);
      if (status) params.set('status', status);
      setData(await apiRequest<Paged<Giveaway>>(`/giveaways?${params}`));
    } catch (error) {
      message.error(error instanceof Error ? error.message : '抽奖加载失败');
    } finally {
      setLoading(false);
    }
  };

  const loadParticipants = async (giveaway: Giveaway) => {
    const result = await apiRequest<Paged<Participant>>(
      `/giveaways/${giveaway.giveaway_id}/participants?page_size=100`,
    );
    setParticipants(result.items);
    setSelected(giveaway);
  };

  const loadBans = async (page = 1) => {
    if (!chatId) return;
    setBanLoading(true);
    try {
      setBans(
        await apiRequest<Paged<GiveawayBan>>(
          `/chats/${chatId}/giveaway-bans?page=${page}&page_size=20`,
        ),
      );
    } finally {
      setBanLoading(false);
    }
  };

  const removeParticipant = async (item: Participant, refund: boolean) => {
    await apiRequest(
      `/giveaways/${selected?.giveaway_id}/participants/${item.user_id}`,
      jsonOptions('DELETE', {
        confirm: true,
        refund,
        reason: refund ? '管理员面板移除' : '违规移除，不退还报名积分',
      }),
    );
    if (selected) await loadParticipants(selected);
  };

  useEffect(() => {
    apiRequest<Paged<ChatSummary>>('/chats?page_size=100').then((result) => {
      const accessibleChats = result.items.filter((chat) => chat.accessible);
      setChats(accessibleChats);
      setChatId(
        initialChat && accessibleChats.some((chat) => chat.chat_id === initialChat)
          ? initialChat
          : undefined,
      );
    });
  }, []);

  useEffect(() => {
    void load(1);
  }, [chatId, status]);

  const runDanger = (title: string, action: () => Promise<unknown>) => {
    Modal.confirm({
      title,
      content: '提交后服务端会重新校验机器人 Telegram 权限和抽奖状态。',
      okText: '确认执行',
      okButtonProps: { danger: true },
      onOk: async () => {
        await action();
        message.success('操作成功');
        await load(data.page);
      },
    });
  };

  const columns: ColumnsType<Giveaway> = [
    {
      title: '抽奖',
      key: 'giveaway',
      minWidth: 220,
      render: (_, record) => (
        <Space direction="vertical" size={0}>
          <Typography.Text strong>{record.title}</Typography.Text>
          <Typography.Text code>#{record.giveaway_id}</Typography.Text>
        </Space>
      ),
    },
    { title: '群 ID', dataIndex: 'chat_id', width: 150, responsive: ['md'], className: 'numeric' },
    { title: '状态', key: 'status', width: 100, render: (_, record) => <StatusTag status={giveawayDisplayStatus(record)} /> },
    {
      title: '积分条件',
      key: 'points',
      width: 190,
      render: (_, record) => (
        <Space size={[4, 4]} wrap>
          <Tag>门槛 {record.minimum_points}</Tag>
          <Tag color={record.entry_cost ? 'gold' : 'default'}>消耗 {record.entry_cost}</Tag>
          <Tag color={record.participation_reward ? 'green' : 'default'}>参与 +{record.participation_reward}</Tag>
        </Space>
      ),
    },
    {
      title: '报名 / 开奖时间',
      key: 'schedule',
      width: 190,
      render: (_, record) => (
        <Space direction="vertical" size={0}>
          <Typography.Text>{dayjs(record.starts_at || record.created_at).format('YYYY-MM-DD HH:mm')}</Typography.Text>
          <Typography.Text type="secondary">至 {dayjs(record.ends_at).format('YYYY-MM-DD HH:mm')}</Typography.Text>
        </Space>
      ),
    },
    {
      title: '操作',
      key: 'actions',
      fixed: 'right',
      width: 270,
      render: (_, record) => (
        <Space size={4} wrap>
          <Button type="link" onClick={() => void loadParticipants(record)}>参与者</Button>
          {record.status === 'running' ? (
            <>
              <Button
                type="link"
                icon={<Trophy size={15} />}
                onClick={() =>
                  runDanger('确认立即开奖？', () =>
                    apiRequest(`/giveaways/${record.giveaway_id}/finish`, jsonOptions('POST', { confirm: true })),
                  )
                }
              >
                开奖
              </Button>
              <Button
                danger
                type="link"
                onClick={() =>
                  runDanger('确认取消并退还报名积分？', () =>
                    apiRequest(`/giveaways/${record.giveaway_id}/cancel`, jsonOptions('POST', { confirm: true })),
                  )
                }
              >
                取消
              </Button>
            </>
          ) : null}
          {record.status === 'finished' ? (
            <Button
              type="link"
              icon={<RotateCcw size={15} />}
              onClick={() =>
                runDanger('确认重抽全部奖项？', () =>
                  apiRequest(`/giveaways/${record.giveaway_id}/reroll`, jsonOptions('POST', { confirm: true })),
                )
              }
            >
              重抽
            </Button>
          ) : null}
        </Space>
      ),
    },
  ];

  const participantColumns: ColumnsType<Participant> = [
    {
      title: '参与者',
      key: 'user',
      render: (_, item) => userDisplayName(item),
    },
    { title: '用户 ID', dataIndex: 'user_id', width: 140, className: 'numeric' },
    { title: '报名消耗', dataIndex: 'entry_cost', width: 100 },
    { title: '状态', key: 'state', width: 100, render: (_, item) => <Tag color={item.active === false ? 'default' : 'success'}>{item.active === false ? '已移除' : '有效'}</Tag> },
    {
      title: '操作',
      width: 220,
      render: (_, item) => (
        <Space size={4}>
          <Popconfirm
            title="移除参与者并退款？"
            description="确认后退还该参与者的报名积分。"
            disabled={item.active === false || selected?.status !== 'running'}
            onConfirm={() => removeParticipant(item, true)}
          >
            <Button danger type="text" icon={<Trash2 size={16} />} disabled={item.active === false || selected?.status !== 'running'}>
              退款移除
            </Button>
          </Popconfirm>
          <Popconfirm
            title="违规移除且不退款？"
            description="该参与者的报名积分不会退还。"
            disabled={item.active === false || selected?.status !== 'running'}
            onConfirm={() => removeParticipant(item, false)}
          >
            <Button danger type="text" disabled={item.active === false || selected?.status !== 'running'}>
              不退款
            </Button>
          </Popconfirm>
        </Space>
      ),
    },
  ];

  const banColumns: ColumnsType<GiveawayBan> = [
    { title: '用户 ID', dataIndex: 'user_id', width: 150, className: 'numeric' },
    { title: '原因', dataIndex: 'reason', render: (value) => value || '-' },
    { title: '封禁时间', dataIndex: 'created_at', width: 170, render: (value) => dayjs(value).format('YYYY-MM-DD HH:mm') },
    {
      title: '操作',
      width: 100,
      render: (_, item) => (
        <Popconfirm
          title="解除该用户的抽奖资格封禁？"
          onConfirm={async () => {
            await apiRequest(
              `/chats/${chatId}/giveaway-bans/${item.user_id}`,
              jsonOptions('DELETE', { confirm: true }),
            );
            await loadBans(bans.page);
          }}
        >
          <Button type="link">解除</Button>
        </Popconfirm>
      ),
    },
  ];

  return (
    <>
      <PageHeader
        title="抽奖管理"
        actions={
          <Space wrap>
            <Button icon={<RefreshCw size={16} />} loading={loading} onClick={() => void load(data.page)}>刷新</Button>
            <Button
              icon={<UserX size={16} />}
              disabled={!chatId}
              title={chatId ? undefined : '请先选择群组'}
              onClick={() => {
                setBanOpen(true);
                void loadBans(1);
              }}
            >
              资格封禁
            </Button>
            <Button type="primary" icon={<Plus size={16} />} onClick={() => setCreateOpen(true)}>创建抽奖</Button>
          </Space>
        }
      />
      <Surface
        actions={
          <Space wrap>
            <Select
              allowClear
              showSearch
              value={chatId}
              onChange={setChatId}
              placeholder="全部群组"
              optionFilterProp="label"
              style={{ width: 230 }}
              options={chats.map((chat) => ({ value: chat.chat_id, label: chat.title }))}
            />
            <Select
              allowClear
              value={status}
              onChange={setStatus}
              placeholder="全部状态"
              style={{ width: 140 }}
              options={[
                { value: 'running', label: '进行中' },
                { value: 'drawing', label: '开奖中' },
                { value: 'finished', label: '已开奖' },
                { value: 'canceled', label: '已取消' },
              ]}
            />
          </Space>
        }
      >
        <Table
          rowKey="giveaway_id"
          columns={columns}
          dataSource={data.items}
          loading={loading}
          pagination={{ current: data.page, pageSize: data.page_size, total: data.total, showSizeChanger: false }}
          onChange={(pagination) => void load(pagination.current || 1)}
          scroll={{ x: 1100 }}
        />
      </Surface>
      <Modal
        title="创建抽奖"
        open={createOpen}
        width={720}
        okText="创建并发布"
        onCancel={() => setCreateOpen(false)}
        onOk={() => createForm.submit()}
        destroyOnHidden
      >
        <Form
          form={createForm}
          layout="vertical"
          initialValues={{
            chat_id: chatId,
            starts_at: dayjs().add(1, 'day').startOf('day'),
            ends_at: dayjs().add(1, 'day').hour(23).minute(59).second(0).millisecond(0),
            minimum_points: 0,
            entry_cost: 0,
            participation_reward: 0,
            prizes: [{ name: '一等奖', count: 1, points_reward: 0 }],
          }}
          onFinish={(values) => {
            const startsAt = dayjs(values.starts_at);
            const endsAt = dayjs(values.ends_at);
            Modal.confirm({
              title: '确认创建并发布抽奖？',
              content: `抽奖消息会立即发送到所选群组。报名时间：${startsAt.format('YYYY-MM-DD HH:mm')} 至 ${endsAt.format('YYYY-MM-DD HH:mm')}。`,
              okText: '确认发布',
              onOk: async () => {
                await apiRequest(
                  '/giveaways',
                  jsonOptions('POST', {
                    ...values,
                    starts_at: startsAt.toISOString(),
                    ends_at: endsAt.toISOString(),
                    confirm: true,
                  }),
                );
                setCreateOpen(false);
                createForm.resetFields();
                message.success('抽奖已创建并发布到群内');
                await load(1);
              },
            });
          }}
        >
          <Form.Item name="chat_id" label="群组" rules={[{ required: true }]}>
            <Select showSearch optionFilterProp="label" options={chats.map((chat) => ({ value: chat.chat_id, label: chat.title }))} />
          </Form.Item>
          <Form.Item name="title" label="标题" rules={[{ required: true }]}><Input maxLength={200} /></Form.Item>
          <Form.Item name="description" label="说明"><Input.TextArea rows={3} maxLength={4000} /></Form.Item>
          <Space wrap align="start" size={16} style={{ display: 'flex' }}>
            <Form.Item
              name="starts_at"
              label="报名开始时间"
              extra="按浏览器当前时区输入"
              rules={[{ required: true, message: '请选择报名开始时间' }]}
              style={{ flex: 1, minWidth: 240 }}
            >
              <DatePicker showTime={{ format: 'HH:mm' }} format="YYYY-MM-DD HH:mm" style={{ width: '100%' }} />
            </Form.Item>
            <Form.Item
              name="ends_at"
              label="开奖时间"
              dependencies={['starts_at']}
              extra="到时自动公布抽奖结果"
              rules={[
                { required: true, message: '请选择开奖时间' },
                ({ getFieldValue }) => ({
                  validator(_, value) {
                    if (!value || !getFieldValue('starts_at')) return Promise.resolve();
                    if (!dayjs(value).isAfter(dayjs())) {
                      return Promise.reject(new Error('开奖时间必须晚于当前时间'));
                    }
                    if (!dayjs(value).isAfter(dayjs(getFieldValue('starts_at')))) {
                      return Promise.reject(new Error('开奖时间必须晚于报名开始时间'));
                    }
                    return Promise.resolve();
                  },
                }),
              ]}
              style={{ flex: 1, minWidth: 240 }}
            >
              <DatePicker showTime={{ format: 'HH:mm' }} format="YYYY-MM-DD HH:mm" style={{ width: '100%' }} />
            </Form.Item>
          </Space>
          <Form.List name="prizes">
            {(fields, { add, remove }) => (
              <>
                <Divider orientation="left">分级奖项</Divider>
                {fields.map(({ key, ...field }) => (
                  <Space key={key} align="baseline" wrap style={{ display: 'flex', marginBottom: 8 }}>
                    <Form.Item {...field} name={[field.name, 'name']} rules={[{ required: true }]}><Input placeholder="奖项名称" /></Form.Item>
                    <Form.Item {...field} name={[field.name, 'count']} rules={[{ required: true }]}><InputNumber min={1} max={100} placeholder="人数" /></Form.Item>
                    <Form.Item {...field} name={[field.name, 'points_reward']} rules={[{ required: true }]}><InputNumber min={0} placeholder="中奖积分" /></Form.Item>
                    <Button danger type="text" icon={<Trash2 size={16} />} aria-label="删除奖项" onClick={() => remove(field.name)} />
                  </Space>
                ))}
                <Button icon={<Plus size={16} />} onClick={() => add({ name: '', count: 1, points_reward: 0 })}>添加奖项</Button>
              </>
            )}
          </Form.List>
          <Divider orientation="left">积分联动</Divider>
          <Space wrap align="start">
            <Form.Item name="minimum_points" label="最低积分"><InputNumber min={0} /></Form.Item>
            <Form.Item name="entry_cost" label="报名消耗"><InputNumber min={0} /></Form.Item>
            <Form.Item name="participation_reward" label="参与奖励"><InputNumber min={0} /></Form.Item>
          </Space>
        </Form>
      </Modal>
      <Drawer
        title={selected ? `参与者 · #${selected.giveaway_id}` : '参与者'}
        open={Boolean(selected)}
        width="min(760px, 100vw)"
        onClose={() => setSelected(null)}
        extra={
          selected ? (
            <Button
              icon={<Download size={16} />}
              onClick={() => void downloadFile(`/giveaways/${selected.giveaway_id}/export`, `giveaway-${selected.giveaway_id}.csv`)}
            >
              CSV
            </Button>
          ) : null
        }
      >
        {selected ? (
          <>
            <Descriptions size="small" column={2} style={{ marginBottom: 16 }}>
              <Descriptions.Item label="标题">{selected.title}</Descriptions.Item>
              <Descriptions.Item label="状态"><StatusTag status={giveawayDisplayStatus(selected)} /></Descriptions.Item>
              <Descriptions.Item label="报名开始">{dayjs(selected.starts_at || selected.created_at).format('YYYY-MM-DD HH:mm')}</Descriptions.Item>
              <Descriptions.Item label="开奖时间">{dayjs(selected.ends_at).format('YYYY-MM-DD HH:mm')}</Descriptions.Item>
              <Descriptions.Item label="报名消耗">{selected.entry_cost}</Descriptions.Item>
              <Descriptions.Item label="参与奖励">{selected.participation_reward}</Descriptions.Item>
            </Descriptions>
            <Table rowKey="user_id" columns={participantColumns} dataSource={participants} pagination={false} scroll={{ x: 820 }} size="small" />
          </>
        ) : null}
      </Drawer>
      <Drawer
        title={`抽奖资格封禁${chats.find((chat) => chat.chat_id === chatId)?.title ? ` · ${chats.find((chat) => chat.chat_id === chatId)?.title}` : ''}`}
        open={banOpen}
        width="min(760px, 100vw)"
        destroyOnHidden
        onClose={() => setBanOpen(false)}
      >
        <Form
          form={banForm}
          layout="vertical"
          onFinish={(values) => {
            Modal.confirm({
              title: '确认封禁该用户的抽奖资格？',
              content: '该用户将无法报名此群后续抽奖。',
              okText: '确认封禁',
              okButtonProps: { danger: true },
              onOk: async () => {
                await apiRequest(
                  `/chats/${chatId}/giveaway-bans`,
                  jsonOptions('POST', { ...values, confirm: true }),
                );
                banForm.resetFields();
                message.success('抽奖资格已封禁');
                await loadBans(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="reason" label="原因" rules={[{ required: true, message: '请填写封禁原因' }]}>
            <Input.TextArea rows={3} maxLength={500} showCount />
          </Form.Item>
          <Button type="primary" danger htmlType="submit" icon={<UserX size={16} />}>
            添加封禁
          </Button>
        </Form>
        <Divider />
        <Table
          rowKey="user_id"
          columns={banColumns}
          dataSource={bans.items}
          loading={banLoading}
          pagination={{ current: bans.page, pageSize: bans.page_size, total: bans.total, showSizeChanger: false }}
          onChange={(pagination) => void loadBans(pagination.current || 1)}
          scroll={{ x: 620 }}
          size="small"
        />
      </Drawer>
    </>
  );
}