import { useEffect, useMemo, useState } from 'react';
import { ClipboardCopy, FileText } from 'lucide-react';
import { useNavigate } from 'react-router-dom';
import { clientApi, type ApplicationCmppParams, type ClientSmsApplication } from '@/api/adminApi';
import { formatCents } from '@/utils/currency';
import { Button, Modal, Pagination, Tag } from '@/components/ui';
import { copyText } from '@/utils/clipboard';

type LinkStatus = 'connected' | 'degraded' | 'disconnected' | 'inactive';

type ParamRow = {
  label: string;
  value: string;
  highlight?: boolean;
};

const statusLabelMap: Record<LinkStatus, string> = {
  connected: '已连接',
  degraded: '部分连接',
  disconnected: '已断',
  inactive: '未开通',
};

const statusToneMap: Record<LinkStatus, 'success' | 'warning' | 'danger' | 'info'> = {
  connected: 'success',
  degraded: 'warning',
  disconnected: 'danger',
  inactive: 'info',
};

function normalizeStatus(application: ClientSmsApplication): LinkStatus {
  if (application.status !== 'active') {
    return 'inactive';
  }
  return application.cmppStatus ?? 'inactive';
}

function formatPrice(cents?: number | null) {
  return `${formatCents(cents)} 元`;
}

function mapParams(params: ApplicationCmppParams): ParamRow[] {
  return [
    { label: 'ID', value: params.applicationId },
    { label: '企业名', value: params.tenantName },
    { label: '应用名称', value: params.applicationName },
    { label: 'AppID', value: params.appCode },
    { label: '企业代码', value: params.enterpriseCode },
    { label: '账号', value: params.account },
    { label: '密码', value: params.passwordCipher, highlight: true },
    { label: '网关IP', value: params.gatewayHost || '-' },
    { label: '网关端口', value: String(params.gatewayPort || '-') },
    { label: '接入号', value: params.srcId || '-' },
    { label: '连接数', value: String(params.maxConnections || '-') },
    { label: '心跳间隔', value: `${params.heartbeatSeconds} 秒` },
    { label: '协议版本', value: params.protocolVersion },
  ];
}

export function ClientApplicationsPage() {
  const navigate = useNavigate();
  const [applications, setApplications] = useState<ClientSmsApplication[]>([]);
  const [selectedApp, setSelectedApp] = useState<ClientSmsApplication | null>(null);
  const [params, setParams] = useState<ApplicationCmppParams | null>(null);
  const [loading, setLoading] = useState(true);
  const [paramsLoading, setParamsLoading] = useState(false);
  const [page, setPage] = useState(1);
  const [error, setError] = useState('');
  const [paramsError, setParamsError] = useState('');
  const [copied, setCopied] = useState(false);
  const [copyError, setCopyError] = useState('');

  function loadApplications() {
    setLoading(true);
    clientApi.listApplications()
      .then((items) => {
        setApplications(items.filter((item) => item.status !== 'deleted'));
        setError('');
      })
      .catch((reason: Error) => setError(reason.message || '短信应用加载失败'))
      .finally(() => setLoading(false));
  }

  useEffect(() => {
    loadApplications();
  }, []);

  function openParams(application: ClientSmsApplication) {
    if (application.interfaceEnabled === false) return;
    setSelectedApp(application);
    setParams(null);
    setParamsError('');
    setCopied(false);
    setParamsLoading(true);
    clientApi.getApplicationCmppParams(application.id)
      .then((data) => {
        setParams(data);
        setParamsError('');
      })
      .catch((reason: Error) => setParamsError(reason.message || '接口参数加载失败'))
      .finally(() => setParamsLoading(false));
  }

  const selectedRows = useMemo(() => params ? mapParams(params) : [], [params]);
  const pageSize = 10;
  const totalPages = Math.max(1, Math.ceil(applications.length / pageSize));
  const currentPage = Math.min(page, totalPages);
  const visibleApplications = applications.slice((currentPage - 1) * pageSize, currentPage * pageSize);

  useEffect(() => {
    setPage(1);
  }, [applications.length]);

  function copyParams() {
    if (selectedRows.length === 0) {
      return;
    }
    const text = selectedRows.map((item) => `${item.label}: ${item.value}`).join('\n');
    void copyText(text)
      .then(() => { setCopied(true); setCopyError(''); })
      .catch((failure: Error) => setCopyError(failure.message || '复制失败'));
  }

  return (
    <section className="page-stack">
      <div className="sms-send-title">
        <span className="sms-send-title__icon">
          <FileText size={22} />
        </span>
        <h1>短信应用列表</h1>
        <span className="muted">共 {applications.length} 个应用</span>
      </div>

      {loading ? <p className="muted">正在加载短信应用...</p> : null}
      {error ? <p className="form-error">{error}</p> : null}

      {!loading && !error && applications.length === 0 ? (
        <div className="surface ui-table__empty">暂无短信应用</div>
      ) : null}

      <div className="sms-app-grid">
        {visibleApplications.map((application) => {
          const linkStatus = normalizeStatus(application);
          return (
            <article className="sms-app-card" key={application.id}>
              <h2>{application.name}</h2>
              <dl>
                <div>
                  <dt>appid</dt>
                  <dd>{application.id}</dd>
                </div>
                <div>
                  <dt>今日发送成功</dt>
                  <dd>{(application.sentToday ?? 0).toLocaleString('zh-CN')} 条</dd>
                </div>
                <div>
                  <dt>到达率</dt>
                  <dd>{application.deliveryRate !== undefined ? `${application.deliveryRate}%` : '-'}</dd>
                </div>
                <div>
                  <dt>单价</dt>
                  <dd>{formatPrice(application.customerUnitPrice)}</dd>
                </div>
                <div>
                  <dt>CMPP连接状态</dt>
                  <dd><Tag tone={statusToneMap[linkStatus]}>{statusLabelMap[linkStatus]}</Tag></dd>
                </div>
                <div><dt>HTTP接口</dt><dd><Tag tone={application.httpConfig?.enabled ? 'success' : 'info'}>{application.httpConfig?.enabled ? '已开通' : '未开通'}</Tag></dd></div>
              </dl>
              <div className="table-actions"><Button disabled={application.interfaceEnabled === false} onClick={() => openParams(application)} variant="ghost">{application.interfaceEnabled === false ? 'CMPP未开通' : 'CMPP参数'}</Button><Button disabled={!application.httpConfig?.enabled} onClick={() => navigate('/client/http-api')} variant="ghost">HTTP接口对接</Button></div>
            </article>
          );
        })}
      </div>
      <Pagination
        nextDisabled={currentPage >= totalPages}
        onNext={() => setPage((value) => Math.min(totalPages, value + 1))}
        onPrevious={() => setPage((value) => Math.max(1, value - 1))}
        page={currentPage}
        totalPages={totalPages}
        onPageChange={setPage}
        previousDisabled={currentPage <= 1}
        total={applications.length}
      />

      <Modal
        footer={<Button disabled={!params} icon={<ClipboardCopy size={16} />} onClick={copyParams}>{copied ? '已复制' : '复制参数'}</Button>}
        onClose={() => setSelectedApp(null)}
        open={Boolean(selectedApp)}
        size="xl"
        title="接口参数"
      >
        {paramsLoading ? <p className="muted">正在加载接口参数...</p> : null}
        {paramsError ? <p className="form-error">{paramsError}</p> : null}
        {!paramsLoading && !paramsError && selectedRows.length > 0 ? (
          <div className="sms-app-param-table">
            {selectedRows.map((item) => (
              <div key={item.label}>
                <span>{item.label}</span>
                <strong className={item.highlight ? 'text-blue' : undefined}>{item.value}</strong>
              </div>
            ))}
          </div>
        ) : null}
        {copyError ? <p className="form-error">{copyError}</p> : null}
      </Modal>
    </section>
  );
}