'use client';

import { zodResolver } from '@hookform/resolvers/zod';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { useMemo, useState, type FormEvent } from 'react';
import { useForm } from 'react-hook-form';
import { z } from 'zod';

import { EmptyState } from '@/components/feedback/empty-state';
import { ErrorState } from '@/components/feedback/error-state';
import { InlineMessage } from '@/components/feedback/inline-message';
import { LoadingState } from '@/components/feedback/loading-state';
import { PageHeader } from '@/components/layout/page-header';
import { AppModal } from '@/components/ui/app-modal';
import { AppCard } from '@/components/ui/app-card';
import { StatusBadge } from '@/components/ui/status-badge';
import {
  createTlsCertificate,
  deleteTlsCertificate,
  getTlsCertificates,
  importTlsCertificateFiles,
} from '@/features/tls-certificates/api/tls-certificates';
import type {
  TlsCertificateFileImportPayload,
  TlsCertificateItem,
  TlsCertificateMutationPayload,
} from '@/features/tls-certificates/types';
import {
  DangerButton,
  PrimaryButton,
  ResourceField,
  ResourceInput,
  ResourceTextarea,
  SecondaryButton,
} from '@/features/shared/components/resource-primitives';
import { formatDateTime } from '@/lib/utils/date';

const tlsCertificatesQueryKey = ['tls-certificates', 'list'] as const;

const manualImportSchema = z.object({
  name: z
    .string()
    .trim()
    .min(1, '请输入证书名称')
    .max(255, '证书名称不能超过 255 个字符'),
  cert_pem: z.string().trim().min(1, '请输入证书 PEM 内容'),
  key_pem: z.string().trim().min(1, '请输入私钥 PEM 内容'),
  remark: z.string().max(255, '备注不能超过 255 个字符'),
});

type ManualImportFormValues = z.infer<typeof manualImportSchema>;

type FileImportFormValues = {
  name: string;
  remark: string;
};

type FeedbackState = {
  tone: 'info' | 'success' | 'danger';
  message: string;
};

const defaultManualValues: ManualImportFormValues = {
  name: '',
  cert_pem: '',
  key_pem: '',
  remark: '',
};

const defaultFileValues: FileImportFormValues = {
  name: '',
  remark: '',
};

function getErrorMessage(error: unknown) {
  return error instanceof Error ? error.message : '请求失败，请稍后重试。';
}

function getCertificateStatus(certificate: TlsCertificateItem) {
  const expiresAt = new Date(certificate.not_after).getTime();
  const diffMs = expiresAt - Date.now();
  const days = Math.ceil(diffMs / (1000 * 60 * 60 * 24));

  if (Number.isNaN(expiresAt)) {
    return { label: '有效期未知', variant: 'warning' as const };
  }

  if (days < 0) {
    return { label: '已过期', variant: 'danger' as const };
  }

  if (days <= 30) {
    return { label: `${days} 天内到期`, variant: 'warning' as const };
  }

  return { label: '有效', variant: 'success' as const };
}

function toManualPayload(
  values: ManualImportFormValues,
): TlsCertificateMutationPayload {
  return {
    name: values.name.trim(),
    cert_pem: values.cert_pem.trim(),
    key_pem: values.key_pem.trim(),
    remark: values.remark.trim(),
  };
}

function toFilePayload(
  values: FileImportFormValues,
  certFile: File | null,
  keyFile: File | null,
): TlsCertificateFileImportPayload {
  if (!certFile || !keyFile) {
    throw new Error('请选择证书文件和私钥文件。');
  }

  return {
    name: values.name.trim(),
    remark: values.remark.trim(),
    certFile,
    keyFile,
  };
}

export function TlsCertificatesPage() {
  const queryClient = useQueryClient();
  const [feedback, setFeedback] = useState<FeedbackState | null>(null);
  const [isImportModalOpen, setIsImportModalOpen] = useState(false);
  const [importMode, setImportMode] = useState<'manual' | 'file'>('manual');
  const [fileForm, setFileForm] =
    useState<FileImportFormValues>(defaultFileValues);
  const [certFile, setCertFile] = useState<File | null>(null);
  const [keyFile, setKeyFile] = useState<File | null>(null);
  const [fileInputNonce, setFileInputNonce] = useState(0);

  const manualForm = useForm<ManualImportFormValues>({
    resolver: zodResolver(manualImportSchema),
    defaultValues: defaultManualValues,
  });

  const certificatesQuery = useQuery({
    queryKey: tlsCertificatesQueryKey,
    queryFn: getTlsCertificates,
  });

  const manualImportMutation = useMutation({
    mutationFn: async (values: ManualImportFormValues) =>
      createTlsCertificate(toManualPayload(values)),
    onSuccess: async () => {
      setFeedback({ tone: 'success', message: '证书已导入。' });
      setImportMode('manual');
      setIsImportModalOpen(false);
      manualForm.reset(defaultManualValues);
      await queryClient.invalidateQueries({
        queryKey: tlsCertificatesQueryKey,
      });
    },
    onError: (error) => {
      setFeedback({ tone: 'danger', message: getErrorMessage(error) });
    },
  });

  const fileImportMutation = useMutation({
    mutationFn: async (values: FileImportFormValues) =>
      importTlsCertificateFiles(toFilePayload(values, certFile, keyFile)),
    onSuccess: async () => {
      setFeedback({ tone: 'success', message: '证书文件已导入。' });
      setImportMode('manual');
      setIsImportModalOpen(false);
      setFileForm(defaultFileValues);
      setCertFile(null);
      setKeyFile(null);
      setFileInputNonce((value) => value + 1);
      await queryClient.invalidateQueries({
        queryKey: tlsCertificatesQueryKey,
      });
    },
    onError: (error) => {
      setFeedback({ tone: 'danger', message: getErrorMessage(error) });
    },
  });

  const deleteMutation = useMutation({
    mutationFn: deleteTlsCertificate,
    onSuccess: async () => {
      setFeedback({ tone: 'success', message: '证书已删除。' });
      await queryClient.invalidateQueries({
        queryKey: tlsCertificatesQueryKey,
      });
    },
    onError: (error) => {
      setFeedback({ tone: 'danger', message: getErrorMessage(error) });
    },
  });

  const certificates = useMemo(
    () => certificatesQuery.data ?? [],
    [certificatesQuery.data],
  );

  const handleManualSubmit = manualForm.handleSubmit((values) => {
    setFeedback(null);
    manualImportMutation.mutate(values);
  });

  const handleFileSubmit = (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();
    setFeedback(null);
    fileImportMutation.mutate(fileForm);
  };

  const handleDelete = (certificate: TlsCertificateItem) => {
    if (!window.confirm(`确认删除证书 ${certificate.name} 吗？`)) {
      return;
    }

    setFeedback(null);
    deleteMutation.mutate(certificate.id);
  };

  const handleCloseImportModal = () => {
    setImportMode('manual');
    setIsImportModalOpen(false);
  };

  return (
    <>
      <div className="space-y-6">
        <PageHeader
          title="TLS 证书"
          description="支持手动粘贴 PEM 导入和文件上传导入，并展示证书有效期与到期风险。"
          action={
            <PrimaryButton
              type="button"
              onClick={() => {
                setImportMode('manual');
                setIsImportModalOpen(true);
              }}
            >
              导入证书
            </PrimaryButton>
          }
        />

        {feedback ? (
          <InlineMessage tone={feedback.tone} message={feedback.message} />
        ) : null}

        <AppCard
          title="证书列表"
          action={
            <SecondaryButton
              type="button"
              onClick={() =>
                void queryClient.invalidateQueries({
                  queryKey: tlsCertificatesQueryKey,
                })
              }
            >
              刷新
            </SecondaryButton>
          }
        >
          {certificatesQuery.isLoading ? (
            <LoadingState />
          ) : certificatesQuery.isError ? (
            <ErrorState
              title="证书列表加载失败"
              description={getErrorMessage(certificatesQuery.error)}
            />
          ) : certificates.length === 0 ? (
            <EmptyState
              title="暂无证书"
              description="请先导入至少一张证书，再为 HTTPS 规则或域名绑定使用。"
            />
          ) : (
            <div className="overflow-x-auto">
              <table className="min-w-full divide-y divide-[var(--border-default)] text-left text-sm">
                <thead>
                  <tr className="text-[var(--foreground-secondary)]">
                    <th className="px-3 py-3 font-medium">名称</th>
                    <th className="px-3 py-3 font-medium">状态</th>
                    <th className="px-3 py-3 font-medium">有效期</th>
                    <th className="px-3 py-3 font-medium">备注</th>
                    <th className="px-3 py-3 font-medium">更新时间</th>
                    <th className="px-3 py-3 font-medium">操作</th>
                  </tr>
                </thead>
                <tbody className="divide-y divide-[var(--border-default)]">
                  {certificates.map((certificate) => {
                    const status = getCertificateStatus(certificate);

                    return (
                      <tr key={certificate.id} className="align-top">
                        <td className="px-3 py-4 font-medium text-[var(--foreground-primary)]">
                          {certificate.name}
                        </td>
                        <td className="px-3 py-4">
                          <StatusBadge
                            label={status.label}
                            variant={status.variant}
                          />
                        </td>
                        <td className="px-3 py-4 text-[var(--foreground-secondary)]">
                          <div className="space-y-1">
                            <p>{formatDateTime(certificate.not_before)}</p>
                            <p>{formatDateTime(certificate.not_after)}</p>
                          </div>
                        </td>
                        <td className="px-3 py-4 text-[var(--foreground-secondary)]">
                          {certificate.remark || '—'}
                        </td>
                        <td className="px-3 py-4 text-[var(--foreground-secondary)]">
                          {formatDateTime(certificate.updated_at)}
                        </td>
                        <td className="px-3 py-4">
                          <DangerButton
                            type="button"
                            onClick={() => handleDelete(certificate)}
                            disabled={deleteMutation.isPending}
                            className="px-3 py-2 text-xs"
                          >
                            删除
                          </DangerButton>
                        </td>
                      </tr>
                    );
                  })}
                </tbody>
              </table>
            </div>
          )}
        </AppCard>
      </div>
      <AppModal
        isOpen={isImportModalOpen}
        onClose={handleCloseImportModal}
        title="导入证书"
        description="手动导入和文档导入通过标签切换，避免在同一层同时堆叠两套表单。"
        size="xl"
      >
        <div className="space-y-6">
          <div className="inline-flex rounded-2xl border border-[var(--border-default)] bg-[var(--surface-elevated)] p-1">
            <button
              type="button"
              onClick={() => setImportMode('manual')}
              className={`rounded-xl px-4 py-2 text-sm font-medium transition ${
                importMode === 'manual'
                  ? 'bg-[var(--brand-primary)] text-[var(--foreground-inverse)]'
                  : 'text-[var(--foreground-secondary)] hover:text-[var(--foreground-primary)]'
              }`}
            >
              手动导入
            </button>
            <button
              type="button"
              onClick={() => setImportMode('file')}
              className={`rounded-xl px-4 py-2 text-sm font-medium transition ${
                importMode === 'file'
                  ? 'bg-[var(--brand-primary)] text-[var(--foreground-inverse)]'
                  : 'text-[var(--foreground-secondary)] hover:text-[var(--foreground-primary)]'
              }`}
            >
              文档导入
            </button>
          </div>

          {importMode === 'manual' ? (
            <AppCard
              description="直接粘贴 PEM 证书和私钥内容，适合快速录入已有证书。"
            >
              <form className="space-y-5" onSubmit={handleManualSubmit}>
                <div className="grid gap-4 md:grid-cols-2">
                  <ResourceField
                    label="证书名称"
                    error={manualForm.formState.errors.name?.message}
                  >
                    <ResourceInput
                      placeholder="example-com"
                      {...manualForm.register('name')}
                    />
                  </ResourceField>
                  <ResourceField
                    label="备注"
                    hint="可选，用于记录证书用途或来源。"
                    error={manualForm.formState.errors.remark?.message}
                  >
                    <ResourceInput
                      placeholder="例如：主站生产证书"
                      {...manualForm.register('remark')}
                    />
                  </ResourceField>
                </div>

                <ResourceField
                  label="证书 PEM"
                  error={manualForm.formState.errors.cert_pem?.message}
                >
                  <ResourceTextarea
                    placeholder="-----BEGIN CERTIFICATE-----"
                    className="min-h-40 font-mono text-xs"
                    {...manualForm.register('cert_pem')}
                  />
                </ResourceField>

                <ResourceField
                  label="私钥 PEM"
                  error={manualForm.formState.errors.key_pem?.message}
                >
                  <ResourceTextarea
                    placeholder="-----BEGIN PRIVATE KEY-----"
                    className="min-h-40 font-mono text-xs"
                    {...manualForm.register('key_pem')}
                  />
                </ResourceField>

                <PrimaryButton
                  type="submit"
                  disabled={manualImportMutation.isPending}
                >
                  {manualImportMutation.isPending ? '导入中...' : '导入证书'}
                </PrimaryButton>
              </form>
            </AppCard>
          ) : (
            <AppCard
              description="上传证书文件和私钥文件，适合直接复用现有 PEM 文件。"
            >
              <form className="space-y-5" onSubmit={handleFileSubmit}>
                <div className="grid gap-4 md:grid-cols-2">
                  <ResourceField label="证书名称">
                    <ResourceInput
                      value={fileForm.name}
                      onChange={(event) =>
                        setFileForm((current) => ({
                          ...current,
                          name: event.target.value,
                        }))
                      }
                      placeholder="wildcard-example"
                    />
                  </ResourceField>
                  <ResourceField
                    label="备注"
                  >
                    <ResourceInput
                      value={fileForm.remark}
                      onChange={(event) =>
                        setFileForm((current) => ({
                          ...current,
                          remark: event.target.value,
                        }))
                      }
                      placeholder="例如：泛域名生产证书"
                    />
                  </ResourceField>
                </div>

                <div className="grid gap-4 md:grid-cols-2">
                  <ResourceField
                    label="证书文件"
                    hint={
                      certFile
                        ? `已选择：${certFile.name}`
                        : '请选择 PEM/CRT 文件'
                    }
                  >
                    <ResourceInput
                      key={`cert-${fileInputNonce}`}
                      type="file"
                      accept=".pem,.crt,.cer"
                      onChange={(event) =>
                        setCertFile(event.target.files?.[0] ?? null)
                      }
                    />
                  </ResourceField>
                  <ResourceField
                    label="私钥文件"
                    hint={
                      keyFile
                        ? `已选择：${keyFile.name}`
                        : '请选择 KEY/PEM 文件'
                    }
                  >
                    <ResourceInput
                      key={`key-${fileInputNonce}`}
                      type="file"
                      accept=".key,.pem"
                      onChange={(event) =>
                        setKeyFile(event.target.files?.[0] ?? null)
                      }
                    />
                  </ResourceField>
                </div>

                <div className="flex flex-wrap gap-3">
                  <PrimaryButton
                    type="submit"
                    disabled={fileImportMutation.isPending}
                  >
                    {fileImportMutation.isPending ? '上传中...' : '上传文件'}
                  </PrimaryButton>
                  <SecondaryButton
                    type="button"
                    onClick={() => {
                      setFileForm(defaultFileValues);
                      setCertFile(null);
                      setKeyFile(null);
                      setFileInputNonce((value) => value + 1);
                    }}
                    disabled={fileImportMutation.isPending}
                  >
                    清空文件
                  </SecondaryButton>
                </div>
              </form>
            </AppCard>
          )}
        </div>
      </AppModal>
    </>
  );
}