import { useState, useEffect } from 'react';
import { useTranslation } from 'react-i18next';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Plus, Search, Key, RefreshCw } from 'lucide-react';
import { toast } from 'sonner';
import { cloudApi } from '@/api';
import { CloudAccountDetailSheet } from './CloudAccountDetailSheet';
import { CloudServerImport } from '@/components/server/CloudServerImport';
import { PageShell } from '@/components/layout/PageShell';
import { PageLoading } from '@/components/layout/PageLoading';
import { PageEmpty } from '@/components/layout/PageEmpty';
import { StatStrip } from '@/components/ui/stat-strip';
import type { JsonData } from '@/types/common';
import {
  type AccountFormData,
  type ActionLoading,
  getInitialFormData,
  buildFormDataFromAccount,
  computeAccountStats,
  filterAccounts,
  getProviderLabels,
} from './cloud-account/types';
import { AccountCard } from './cloud-account/AccountCard';
import { AccountFormDialog } from './cloud-account/AccountFormDialog';

export function CloudAccountManager() {
  const { t } = useTranslation();
  const [accounts, setAccounts] = useState<JsonData[]>([]);
  const [loading, setLoading] = useState(true);
  const [searchQuery, setSearchQuery] = useState('');
  const [selectedProvider, setSelectedProvider] = useState<string>('all');

  // 创建/编辑账号表单状态
  const [formOpen, setFormOpen] = useState(false);
  const [submitting, setSubmitting] = useState(false);
  const [editingAccount, setEditingAccount] = useState<JsonData | null>(null);
  const [formData, setFormData] = useState<AccountFormData>(getInitialFormData());
  const [detailAccount, setDetailAccount] = useState<JsonData | null>(null);
  const [detailOpen, setDetailOpen] = useState(false);
  const [importOpen, setImportOpen] = useState(false);
  const [importAccountId, setImportAccountId] = useState<number | string | undefined>();
  const [actionLoading, setActionLoading] = useState<ActionLoading>({});

  const providerLabels = getProviderLabels(t);

  const setCardAction = (accountId: string | number, action: string | null) => {
    setActionLoading((prev) => {
      const next = { ...prev };
      const key = String(accountId);
      if (action) next[key] = action;
      else delete next[key];
      return next;
    });
  };

  const openDetail = (account: JsonData) => {
    setDetailAccount(account);
    setDetailOpen(true);
  };

  const openImport = (account: JsonData) => {
    setImportAccountId(account.id);
    setImportOpen(true);
  };

  const handleQuickSyncRegions = async (account: JsonData) => {
    setCardAction(account.id, 'regions');
    try {
      await cloudApi.syncRegions(account.id);
      toast.success(t('cloud.syncRegionsSuccess'));
      loadData();
    } catch (e) {
      toast.error(t('cloud.syncRegionsFailed'), {
        description: e instanceof Error ? e.message : String(e),
      });
    } finally {
      setCardAction(account.id, null);
    }
  };

  const handleQuickSyncBilling = async (account: JsonData) => {
    setCardAction(account.id, 'billing');
    try {
      const res = await cloudApi.syncBilling(account.id);
      const errs = res?.errors || [];
      if (errs.length > 0) {
        toast.warning(t('cloud.syncBillingPartial'), { description: errs.join('\n') });
      } else {
        toast.success(t('cloud.syncBillingSuccess'), {
          description: t('cloud.syncBillingResult', {
            date: res.billing_date,
            created: res.created,
            updated: res.updated,
          }),
        });
      }
      loadData();
    } catch (e) {
      toast.error(t('cloud.syncBillingFailed'), {
        description: e instanceof Error ? e.message : String(e),
      });
    } finally {
      setCardAction(account.id, null);
    }
  };

  const resetForm = () => {
    setEditingAccount(null);
    setFormData(getInitialFormData());
  };

  const handleOpenCreate = () => {
    resetForm();
    setFormOpen(true);
  };

  const handleOpenEdit = (account: JsonData) => {
    setEditingAccount(account);
    setFormData(buildFormDataFromAccount(account));
    setFormOpen(true);
  };

  const handleSubmit = async () => {
    if (!formData.name.trim() || !formData.provider.trim()) return;
    try {
      setSubmitting(true);
      const payload: JsonData = {
        name: formData.name.trim(),
        provider: formData.provider,
        access_key: formData.access_key.trim(),
        secret_key: formData.secret_key.trim(),
        monthly_cost: Number(formData.monthly_cost) || 0,
        status: formData.status,
      };
      if (editingAccount) {
        await cloudApi.updateAccount(editingAccount.id, payload);
      } else {
        await cloudApi.createAccount(payload);
      }
      setFormOpen(false);
      loadData();
    } catch (e) {
      console.error(editingAccount ? 'update account' : 'create account', e);
    } finally {
      setSubmitting(false);
    }
  };

  const loadData = async () => {
    try {
      setLoading(true);
      const res: JsonData = await cloudApi.getAccounts();
      setAccounts(res?.list || []);
    } catch (_e) {
      setAccounts([]);
    } finally {
      setLoading(false);
    }
  };

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

  const handleDelete = async (id: string) => {
    try {
      await cloudApi.deleteAccount(id);
      loadData();
    } catch (_e) {
      // silently ignored
    }
  };

  const filteredAccounts = filterAccounts(accounts, searchQuery, selectedProvider);
  const stats = computeAccountStats(accounts);

  const toolbar = (
    <div className="flex items-center gap-4 flex-wrap">
      <div className="relative flex-1 max-w-md">
        <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 dg-text-muted" />
        <Input
          placeholder={t('cloud.searchAccount')}
          value={searchQuery}
          onChange={(e) => setSearchQuery(e.target.value)}
          className="pl-10 h-9 dg-input"
        />
      </div>
      <select
        value={selectedProvider}
        onChange={(e) => setSelectedProvider(e.target.value)}
        className="px-3 py-2 h-9 rounded-md text-sm dg-input"
      >
        <option value="all">{t('cloud.allProviders')}</option>
        <option value="aws">AWS</option>
        <option value="aliyun">{t('cloud.aliyun')}</option>
        <option value="tencent">{t('cloud.tencent')}</option>
        <option value="huawei">{t('cloud.huawei')}</option>
        <option value="azure">Azure</option>
      </select>
    </div>
  );

  return (
    <PageShell
      variant="list"
      title={t('cloud.cloudAccounts')}
      subtitle={t('cloud.accountsSubtitle')}
      icon={<Key className="h-5 w-5" />}
      metrics={
        !loading ? (
          <StatStrip
            items={[
              { label: t('common.total'), value: stats.total, color: 'blue' },
              { label: t('cloud.normal'), value: stats.active, color: 'green' },
              { label: t('cloud.disabled'), value: stats.inactive, color: 'muted' },
              {
                label: t('cloud.error'),
                value: stats.error,
                color: stats.error > 0 ? 'red' : 'muted',
              },
            ]}
          />
        ) : undefined
      }
      toolbar={toolbar}
      actions={
        <>
          <Button variant="outline" size="sm" onClick={loadData} className="dg-btn-secondary">
            <RefreshCw className={`h-4 w-4 mr-1 ${loading ? 'animate-spin' : ''}`} />
            {t('common.refresh')}
          </Button>
          <Button size="sm" className="dg-btn-primary" onClick={handleOpenCreate}>
            <Plus className="h-4 w-4 mr-1" />
            {t('cloud.addAccount')}
          </Button>
        </>
      }
    >
      {loading ? (
        <PageLoading />
      ) : filteredAccounts.length === 0 ? (
        <PageEmpty
          icon={<Key className="h-12 w-12" />}
          title={t('cloud.noAccountData')}
          action={
            <Button size="sm" className="dg-btn-primary" onClick={handleOpenCreate}>
              <Plus className="h-4 w-4 mr-1" />
              {t('cloud.addAccount')}
            </Button>
          }
        />
      ) : (
        <div className="grid grid-cols-2 gap-4">
          {filteredAccounts.map((account) => (
            <AccountCard
              key={account.id}
              account={account}
              providerLabels={providerLabels}
              actionLoading={actionLoading}
              onEdit={handleOpenEdit}
              onDelete={handleDelete}
              onDetail={openDetail}
              onSyncRegions={handleQuickSyncRegions}
              onSyncBilling={handleQuickSyncBilling}
              onImport={openImport}
            />
          ))}
        </div>
      )}

      <AccountFormDialog
        open={formOpen}
        onOpenChange={setFormOpen}
        editingAccount={editingAccount}
        formData={formData}
        onFormDataChange={setFormData}
        submitting={submitting}
        onSubmit={handleSubmit}
      />

      <CloudAccountDetailSheet
        account={detailAccount}
        open={detailOpen}
        onOpenChange={setDetailOpen}
        providerLabels={providerLabels}
        onSyncRegions={loadData}
        onSyncBilling={loadData}
        onImportHosts={() => {
          if (detailAccount) {
            setDetailOpen(false);
            openImport(detailAccount);
          }
        }}
      />

      <CloudServerImport
        open={importOpen}
        initialAccountId={importAccountId}
        onClose={() => {
          setImportOpen(false);
          setImportAccountId(undefined);
          loadData();
        }}
      />
    </PageShell>
  );
}