import { useEffect, useState } from 'react';
import { Plus, Search } from 'lucide-react';
import { useNavigate } from 'react-router-dom';
import { adminApi, type CmppConnectionState } from '@/api/adminApi';
import { Breadcrumb, Button, Input, Modal, Select } from '@/components/ui';
import { ChannelFormModal } from './channels/ChannelFormModal';
import { ChannelLogModal } from './channels/ChannelLogModal';
import { ChannelTable } from './channels/ChannelTable';
import { SmsTestModal } from './channels/SmsTestModal';
import { buildChannelPayload, carrierOptions, mapApiChannel, mapUiStatusToApi, statusOptions } from './channels/channelModel';
import type { ChannelConfirmAction, ChannelLogState, ChannelModalState, SmsChannel } from './channels/channelTypes';
import './channels/AdminChannelsPage.css';

export function AdminChannelsPage() {
  const navigate = useNavigate();
  const [channels, setChannels] = useState<SmsChannel[]>([]);
  const [error, setError] = useState('');
  const [keyword, setKeyword] = useState('');
  const [carrier, setCarrier] = useState('all');
  const [status, setStatus] = useState('all');
  const [modal, setModal] = useState<ChannelModalState | null>(null);
  const [testChannel, setTestChannel] = useState<SmsChannel | null>(null);
  const [confirmAction, setConfirmAction] = useState<ChannelConfirmAction | null>(null);
  const [logState, setLogState] = useState<ChannelLogState | null>(null);
  const [logKeyword, setLogKeyword] = useState('');
  const [page, setPage] = useState(1);
  const [total, setTotal] = useState(0);
  const pageSize = 10;

  function loadChannels(targetPage = page, filters = { keyword, carrier, status }) {
    Promise.all([
      adminApi.listChannelsPage({ keyword: filters.keyword.trim() || undefined, carrier: filters.carrier, status: filters.status, page: targetPage, pageSize }),
      adminApi.getSendQuality(),
    ])
      .then(async ([result, quality]) => {
        const visibleChannels = result.items;
        const connections = await Promise.all(visibleChannels.map((channel) =>
          adminApi.listChannelConnections(channel.id).catch(() => [] as CmppConnectionState[]),
        ));
        const qualityByChannel = new Map(quality.channels.map((item) => [item.channelId, item]));
        setChannels(visibleChannels.map((item, index) => mapApiChannel(item, connections[index], qualityByChannel.get(item.id))));
        setTotal(result.total);
        setError('');
      })
      .catch((failure: Error) => setError(failure.message || '通道列表加载失败'));
  }

  useEffect(() => {
    loadChannels(page);
  }, [page]);

  const totalPages = Math.max(1, Math.ceil(total / pageSize));
  const currentPage = Math.min(page, totalPages);

  async function upsertChannel(nextChannel: SmsChannel) {
    try {
      if (modal?.mode === 'edit' && modal.channel) {
        await adminApi.updateChannel(modal.channel.id, buildChannelPayload(nextChannel, nextChannel.passwordCipher));
      } else {
        await adminApi.createChannel({
          code: `CH-${Date.now()}`,
          ...buildChannelPayload(nextChannel, nextChannel.passwordCipher || 'secret'),
          status: 'active',
        });
      }
      loadChannels();
      setModal(null);
      setError('');
    } catch (failure) {
      setError(failure instanceof Error ? failure.message : '通道保存失败');
    }
  }

  async function toggleChannel(channel: SmsChannel) {
    await adminApi.changeChannelStatus(channel.id, mapUiStatusToApi(channel));
    loadChannels();
  }

  async function copyChannel(channel: SmsChannel) {
    await adminApi.copyChannel(channel.id);
    loadChannels();
  }

  async function openLinkLogs(channel: SmsChannel) {
    setLogState({ channel });
    setLogKeyword('');
    try {
      const data = await adminApi.listChannelConnectionLogs(channel.id);
      setLogState({ channel, data });
    } catch (failure) {
      setLogState(null);
      setError(failure instanceof Error ? failure.message : '连接日志加载失败');
    }
  }

  function submitConfirmAction() {
    if (!confirmAction) {
      return;
    }
    if (confirmAction.type === 'toggle') {
      void toggleChannel(confirmAction.channel);
    }
    if (confirmAction.type === 'copy') {
      void copyChannel(confirmAction.channel);
    }
    setConfirmAction(null);
  }

  const confirmTitle = confirmAction?.type === 'copy'
    ? '确认复制通道'
    : confirmAction?.channel.status === 'stopped'
      ? '确认启用通道'
      : '确认停用通道';

  const confirmDescription = confirmAction?.type === 'copy'
    ? '系统将复制当前通道配置和报备详情，并新建一条名称带“副本”的通道。'
    : confirmAction?.channel.status === 'stopped'
      ? '启用后通道会进入连接中状态，后续可继续观察网关连接。'
      : '停用后该通道将不再承接新的发送任务。';

  return (
    <section className="page-stack sms-channel-page">
      <div className="page-heading">
        <Breadcrumb items={['短信通道管理']} />
        <Button icon={<Plus size={16} />} onClick={() => setModal({ mode: 'create' })}>添加通道</Button>
      </div>
      {error ? <p className="form-error">{error}</p> : null}

      <div className="surface sms-channel-filter">
        <div className="sms-channel-filter-grid">
          <Input label="通道名称" onChange={(event) => setKeyword(event.target.value)} placeholder="请输入通道名称" value={keyword} />
          <Select label="运营商" onChange={(event) => setCarrier(event.target.value)} options={carrierOptions} value={carrier} />
          <Select label="当前状态" onChange={(event) => setStatus(event.target.value)} options={statusOptions} value={status} />
          <div className="audit-filter-actions">
            <Button icon={<Search size={16} />} onClick={() => { setPage(1); void loadChannels(1); }}>查询</Button>
            <Button onClick={() => { setKeyword(''); setCarrier('all'); setStatus('all'); setPage(1); void loadChannels(1, { keyword: '', carrier: 'all', status: 'all' }); }} variant="ghost">重置</Button>
          </div>
        </div>
      </div>

      <ChannelTable
        channels={channels}
        currentPage={currentPage}
        onConfirm={setConfirmAction}
        onDeleted={() => void loadChannels()}
        onEdit={setModal}
        onOpenLogs={(channel) => void openLinkLogs(channel)}
        onOpenReports={(channel) => navigate(`/admin/channels/${channel.id}/reports`)}
        onPageChange={setPage}
        onTest={setTestChannel}
        total={total}
        totalPages={totalPages}
      />

      {modal ? <ChannelFormModal modal={modal} onClose={() => setModal(null)} onSubmit={upsertChannel} /> : null}
      {testChannel ? (
        <SmsTestModal
          channel={testChannel}
          onClose={() => setTestChannel(null)}
          onOpenRecords={() => {
            setTestChannel(null);
            navigate('/admin/sms-records');
          }}
        />
      ) : null}

      {confirmAction ? (
        <Modal
          footer={(
            <>
              <Button onClick={() => setConfirmAction(null)} variant="ghost">取消</Button>
              <Button onClick={submitConfirmAction}>确认</Button>
            </>
          )}
          onClose={() => setConfirmAction(null)}
          open
          title={confirmTitle}
        >
          <div className="channel-confirm">
            <strong>{confirmAction.channel.name}</strong>
            <span>通道 ID：{confirmAction.channel.id}</span>
            <p>{confirmDescription}</p>
          </div>
        </Modal>
      ) : null}

      {logState ? (
        <ChannelLogModal
          keyword={logKeyword}
          logState={logState}
          onClose={() => setLogState(null)}
          onKeywordChange={setLogKeyword}
        />
      ) : null}
    </section>
  );
}